JPH11251945A - Satellite broadcasting receiver, and antenna polarization plane angle adjusting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust the attitude of an antenna while separating the adjustment of the azimuth and the elevation angle of an antenna at the time of installing the antenna from the adjustment of the angle of a polarization plane by detecting the presence or absence of the shift of the angle of the polarization plane in the antenna with the relative extent relation of discrimi nate reception power and the relative extent relation of a discriminated demodulation but error rate. SOLUTION: The reception power judgment part of a polarization plane angle detection part a12 inputs a reception level identified in a reception power identification part 5 and judges a comparison result with a threshold. A bit error rate(BER) judgment part inputs BER data from an error correction part a 7 and judges the comparison result with the threshold. A state judgment part judges the presence or absence of the shift of the angle of the polarization plane from the judged result of both judgment parts. The reception power of the reception carrier is detected and the demodulation bit error rate of demodulated digital data is discriminated. The relative extent relation of detected reception power against the threshold is discriminated and the relative extent relation of the demodulation but error rate against the threshold is discriminated. The presence or absence of the shift of the angle of the polarization pane in the antenna is detected by the relative extent relations of reception power and the demodulation but error rate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite broadcast receiver and to a means for adjusting the angle of polarization of an antenna connected to the receiver. More specifically, the present invention relates to an installation of an antenna for a CS digital broadcast receiver. Related to the method.

[0002]

2. Description of the Related Art Next, the operation of a conventional satellite digital broadcast receiver will be described. FIG. 31 is a block diagram showing a front end unit (tuner + digital demodulation + error correction + transport stream output) in a generally known conventional satellite digital broadcast receiver. In the figure, reference numeral 1 denotes a parabolic antenna that receives a radio wave from a satellite and converges at the focal point, and 2 receives a radio wave converged by the antenna 1 and transmits a Ku band (12 GHz band) to an RF frequency (about 1 to 2 GHz). Convert to Low Nois
e Block-converter (LNB) 3 receives the RF signal supplied from LNB 2 and converts the QPSK-modulated signal to I (In Pahse: starting point at 0 degree phase).
A tuner for separating into a Q (Quadrature: starting point at a phase of 90 degrees) signal and converting it to a baseband signal; 4, an A / D converter for quantizing the IQ baseband signal output from the tuner 3; A / D converter 4
, The signal power of the output of the tuner 3 is detected, and the received power discriminator 6 for controlling the AGC circuit built in the tuner 3.
When the Q signal is input and the phase synchronization process is performed, the I signal and the Q signal are
A QPSK demodulation unit for identifying the signal by narrowing down the signal from four possible combinations to two types of combinations.
The error correction units a and 8 that input the output of the SK demodulation unit 6 and perform the depuncturing process and Viterbi decoding input the output of the error correction unit a7 and select the correct combination from the two combinations of the I and Q signals. The error correction units b and 9 which perform deinterleaving for canceling the interleave processing performed at the time of transmission in order to prevent error propagation and perform Reed-Solomon error correction input the output of the error correction unit 8 and perform energy diffusion inverse processing and the like. And a transport stream output unit for outputting the MPEG-2 transport stream
0 is a carrier control unit for controlling the oscillation frequency of a local oscillator built in the tuner so that the tuner 3 tunes to a predetermined frequency. 11 is a video, audio and additional information for the output of the transport stream output unit 10. Select and acquire data as necessary, perform processing such as video decoding, audio decoding, and program information acquisition, and output them as video and audio signals to a monitor such as a TV, or display an electronic program guide. And a transport stream processing unit.

Referring to FIG. 31, an operation in a normal reception state will be described. A Ku band (12 GHz band) signal broadcast from a satellite is received by the antenna 1 and the LNB 2 and input to the tuner 3 as an RF signal. In the tuner 3, the I.P.
The Q component is separated, converted into a signal of a baseband frequency (transmission data rate), and output to the A / D converter 4. Since the tuner 3 generally uses a synchronous detection method, the separated signals are IQ signals having a phase reference of 9
It is in one of four states (I / Q or Q / -I and their inverted states) that differ by 0 degrees, and at this stage, the separated IQ signal is It cannot be determined whether or not it is.

In the A / D converter 4, the input IQ signals are quantized by free sampling by an externally provided fixed oscillator (XO), which is input to the received power discriminator 5. Input to QPSK demodulation section 6.
The received power discriminating unit 5 is built in the tuner 3 based on the input quantized IQ signals so that the output of the tuner 3 has an optimum amplitude level with respect to the input range of the A / D converter 4. And outputs a control signal to the AGC circuit.
The QPSK demodulation unit 6 performs phase synchronization on the input quantized IQ signal by interpolating (re-sampling) the signal level at the optimal sampling point, and the error rate of the subsequent error correction unit a7 Based on the state, the phase state is 90
The "spectrum inversion", which is locked with a shift of degrees, is released, and two states (I / Q or -I /
-Q). The identified IQ signal is output to the error correction unit a7.

[0005] The error correction unit a7 cancels (depunctures) the puncturing process performed during transmission, performs a Viterbi decoding process, and outputs the decoded data to the error correction unit b8. In the error correction unit b8, a synchronization word is detected for the data after Viterbi decoding, the "pseudo-lock" in which the phase state is shifted by 180 degrees is released, the deinterleave processing is performed by the correct combination of I / Q signals, and the read-out is performed. The Solomon error correction processing is performed, and the transport stream output unit 9
Output to The transport stream output unit 9 performs an energy diffusion inverse process on the output of the error correction unit b8 to perform the subsequent transport stream processing unit 1
Output to 1. Transport stream processing unit 11
Then, video, audio, program information, etc. are separated (demultiplexed) from the demodulated and decoded transport stream processed as described above, after descrambling.
Then, it performs necessary decoding processing individually and outputs the result to a monitor device such as a TV.

FIG. 25 is a diagram showing a procedure for installing a parabolic antenna used in connection with a satellite broadcast receiver and adjusting the attitude of the antenna so that the antenna can be correctly received.
In the figures, (a) shows azimuth adjustment for horizontal attitude adjustment of the antenna, (b) shows elevation angle adjustment for vertical attitude adjustment of the antenna, and (c) is used by being attached to the antenna. FIG. 4 shows a polarization plane angle adjustment for adjusting an attachment angle of the LNB according to a polarization plane of a transmission radio wave. In general, the LNB is a receiving element for receiving radio waves reflected and converged by an antenna, and an RF signal (1-2 GHz band) for receiving the received Ku band (12 GHz band) radio waves.
The antenna 1 and the LNB 2 are sometimes collectively referred to as an “antenna” at the time of antenna adjustment or the like.

Next, with reference to FIGS. 31 and 25, the operation of the front-end unit when the antenna is installed in the conventional satellite broadcast receiver will be described. When the antenna is installed, the carrier control unit 10 controls the tuner 3 so as to tune to a specific reception frequency (“satellite frequency”) as a reference.
To control the local oscillator built in. After tuning
The tuner 3 separates the I and Q components of the input QPSK modulated signal in the RF band, performs frequency conversion to a baseband band (transmission data rate), and inputs the converted signal to the A / D converter 4. The IQ baseband signal is A / D
After being quantized by the converter 4, it is input to the received power identification unit 5. In the received power identification unit 5, the input quantization I ·
A control signal for controlling the AGC circuit built in the tuner 3 is generated so that the Q signal has an optimum amplitude within the input range of the A / D converter 4. At the same time, the reception strength estimated from the control signal is detected. Received power identification unit 5
, A reference power level is set in advance, and A
It is determined whether the input level of the / D converter 2 is at an appropriate level with respect to this criterion. It notifies the antenna installer using the video signal or both, and subsequently detects the reception level.

When the input level reaches an appropriate range due to the antenna attitude adjustment, the received power identification unit 5 determines that the antenna 1 has been correctly adjusted in the direction of the satellite, and outputs the audio and / or video signal. Notify the antenna installer using it, and continue to detect the reception level,
In the process of adjusting the antenna attitude, the antenna once adjusted to an appropriate attitude is detected and notified even if it changes to an inappropriate attitude again. The detection of the reception level is continued until the antenna installation is completed.

When the antenna is installed, the direction of the antenna (adjustment of azimuth and elevation) and the angle of polarization are adjusted by using these notification means, but the adjustment of the azimuth, elevation and angle of polarization are all performed at the reception level. Recognized as a change. Regarding the azimuth angle and the elevation angle, since the adjusting action similarly appears as an increase / decrease of the reception level regardless of the polarization plane of the received signal, the optimum adjustment can be performed by the direction adjustment by the notification means. The antenna installer must use the receiver's instruction manual or antenna instruction manual, etc., to determine the azimuth, elevation, and polarization plane angles required for antenna adjustment in various parts of Japan. The attitude of the antenna is adjusted based on the value of the closest point, and the fine adjustment is performed based on the notified reception state. Normally, the antenna mounting member is fixed to a wall, a pole, or the like, and then the azimuth and elevation are adjusted based on the above-described notification of the reception level by the audio and video signals, and finally the polarization plane angle is adjusted. At this time, if the reception level is sufficiently high at the stage when the azimuth and elevation have been adjusted, the azimuth may be determined to be unnecessary and may not be adjusted.

As described above, in the conventional satellite broadcast receiver, as described above, the installer adjusts the attitude of the antenna based on his / her own sense using the reception level notification function of the receiver. Was. However, there are three factors that affect the received signal level at the time of antenna installation: azimuth, elevation, and polarization plane angle.
It is not possible to identify which of these factors has caused the level of the received signal to change. For this reason, the antenna installer must adjust the three factors based on only the level of the reception level by the notification means or the like. In this case, the polarization plane angle adjustment may be omitted as described above.However, if the polarization plane angle adjustment is insufficient, the received signal quality deteriorates due to a noise component that cannot be detected only by the signal level, There is a possibility that stable reception cannot be performed in bad weather such as rainfall.

Regarding the azimuth and elevation, the reception level is checked by adjusting the attitude of the antenna itself.
There is a consciousness of actually adjusting the antenna toward the satellite, and the attitude can be adjusted roughly without special knowledge of the antenna installer. However, as shown in FIG. It is difficult to recognize that the polarization plane angle affects the received signal level because the angle of attachment of the LNB attached to the LNB is adjusted. For this reason, fine adjustment or the like is often not performed on the polarization plane angle.
Also, since the polarization plane angle adjustment has a relatively gradual effect on the received signal level, even if the value of the polarization plane angle described in the instruction manual of the receiver or the antenna is incorrectly set to positive or negative. It may happen that the installer does not notice.

[0012]

[Table 1]

Table 1 above is an example of the value of the polarization plane angle for a typical city in Japan when the satellite is in orbit at 144 degrees east longitude. In the satellites shown in this table, it is assumed that the horizontal and vertical of the transmitted radio wave are set so that the horizontal and vertical at the receiving point coincide with the receiving point in Osaka.
The polarization plane angle greatly depends on the difference between the longitude of the geostationary orbit of the satellite and the longitude of the receiving point. In the case of Japan lying long in the east and west, the value greatly differs depending on the receiving point as shown in Table 1. . For example, it can be seen that there is a difference in the polarization plane angle between Sapporo and Naha near 27 degrees, and that a deviation of 12 degrees occurs in Tokyo if the polarization plane angle is incorrect.

FIG. 26 is a conceptual diagram showing how the received signal level changes when the polarization plane angle of the LNB is shifted from the polarization plane of the received radio wave. In the figure, (a) shows a case where the attached polarization plane angle of the LNB is shifted with respect to the polarization plane angle of the received signal, and a signal on the polarization plane opposite to the polarization plane on which the desired signal is transmitted interferes with the adjacent channel. (B) shows how the received signal spectrum changes due to the polarization plane angle deviation attached to the LNB when a plurality of carrier signals generally used in satellite broadcasting are arranged. As shown in FIGS. 26 (a) and (b), when there is a deviation between the polarization plane angle of the LNB and the polarization plane angle of the received radio wave, the reception level of the desired signal is attenuated along with the angle deviation according to a cosine curve, The carrier component transmitted in the reverse polarization with the desired signal increases as an interference signal in accordance with the sine curve together with the angle shift.

FIG. 28 is a graph showing how the desired signal power decreases and the interference signal increases due to the deviation of the polarization plane angle shown in FIG. In the figure, the vertical axis represents the normalized signal power (unit: dB) when the signal power level of the original received signal (desired signal) in a state where there is no deviation in the polarization plane angle is 0 dB, and the horizontal axis represents LNB. Indicates the deviation (unit: degree) of the polarization plane angle of the signal. As can be seen from FIG. 28, the signal power itself of the desired signal is not significantly affected by the polarization plane shift even if the shift amount increases, but the interference signal increases sharply with the shift amount.

FIG. 29 is a diagram showing the influence of the interference signal on the error-free performance. More specifically, in actual CS digital broadcast reception, the effect of the interference signal on the desired signal is evaluated by the pseudo error-free performance (tuner unit). The D / U ratio (Desire / U) of the limit for achieving the error-corrected output for one minute or more without any error)
This is an example of a measurement result represented by a relationship between an ndesire ratio: a power ratio between a desired signal and a disturbing signal) and a position where the disturbing signal is generated (distance from the desired signal on a frequency axis). In the figure, the desired signal has a signal power-to-noise ratio per bit (Eb / No) of 12 dB and a symbol rate of 2
1.096 Ms / s, and the convolutional coding rate is 7/8. The interference signal has the same symbol rate and convolutional coding rate as the desired signal. The adjacent channel interference is an interference signal at a position 15 MHz away from the carrier frequency of the desired signal, and the adjacent channel interference is a signal at a position 30 MHz away from the carrier frequency of the desired signal. Represents an interference signal.

FIG. 27 is a conceptual diagram showing an arrangement of carriers in a horizontal / vertical polarization system generally used in CS digital satellite broadcasting operated in Japan. In the figure, (a) is a conceptual diagram of a transmission radio wave by a horizontal / vertical polarization method, and (b) is a conceptual diagram showing a carrier arrangement on both horizontal and vertical polarization planes on a frequency axis. As shown in FIGS. 27 (a) and (b), a transmission radio wave is transmitted with a plurality of carriers arranged on two orthogonal polarization planes and transmitted on a transmission band (such that the carriers do not overlap each other on the same polarization plane). 27MHz), the two sides are located between the valleys of the carrier on one of the polarization planes (at a position 15MHz from the carrier center frequency) by using the orthogonality between the planes. One carrier center is arranged. Therefore, in this case, as shown in FIG. 29, adjacent channel interference occurs at a position of 15 MHz, and adjacent adjacent channel interference occurs at a position of 30 MHz. As can be seen from FIG. 28, in the case of adjacent adjacent interference, a value of about -30 dB can be obtained in the D / U ratio. It is not considered to be a problem in nature. However, regarding the adjacent interference, since the D / U ratio takes a value of 0 dB or more, it is considered that the reception quality of the desired signal will be affected if there is a deviation in the polarization plane angle with respect to the received radio wave.

FIG. 30 is a graph in which the D / U ratio between the adjacent channel interference signal and the desired signal changes with the change in the angle of polarization plane angle deviation of the antenna with respect to the received radio wave from the calculated values. In the figure, the vertical axis represents the received carrier as the “desired signal”, and is represented by 1 from the center frequency of the desired signal.
An adjacent carrier generated at the position of 5 MHz is called "interfering signal".
D / U (Desire / Undesir)
e) The ratio (unit: dB), and the horizontal axis represents the amount of polarization plane angle deviation (unit: degree) between the transmission radio wave and the LNB. In FIG. 30, the level represented as “normal reception level in fine weather” is, as in the case of CS satellite broadcasting operated in Japan,
Generally, when the EIRP at the receiving point can be secured at about 54 dB, the reception level can be achieved with a commercial CS broadcast receiving parabolic antenna having a diameter of 45 cm, and the C / N ratio is about 12 dB. The “stable reception limit level” is a symbol rate of 21.096 Ms / s, a convolutional coding rate of 7 /
8, the error free state (error rate 1 × 10
(Approximately −14 or less), which is a limit level that can be received, and has a C / N ratio of about 6 dB. As can be seen from the figure, if the deviation of the polarization plane angle exceeds 15 degrees, the normal reception quality (C / N ratio is about 12 dB) is degraded, and if it exceeds 35 degrees, the limit reception level (C / N ratio is 6 dB).
Degree). As a result, as shown in Table 1, when the polarization plane angle adjustment of the LNB is incorrectly performed, or when the polarization plane angle adjustment is neglected at the outer edge of the receivable area such as Hokkaido or Okinawa. May significantly affect the received signal quality. FIG. 28
As shown in, the deterioration of the reception level is gradual with respect to the deviation of the polarization plane, so that although the reception level is sufficiently ensured, a state where the reception quality cannot be ensured occurs.
This may cause confusion for general antenna installers.

[0019]

As described above, in the conventional satellite broadcasting receiver, when the antenna is installed, (1) the contribution of the polarization plane angle deviation to the reception level is separated from the antenna azimuth angle deviation and the elevation angle deviation. And cannot be detected,
(2) The degree of the polarization plane angle shift cannot be identified,
(3) Therefore, when the antenna installer checks the reception level, it is difficult to appropriately adjust the polarization plane angle, and it is difficult to ensure the reception quality.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first object of the present invention is to use means for estimating the degree of angle deviation of the polarization plane of an antenna from a received signal level. It is an object of the present invention to provide an antenna adjustment device capable of separately adjusting the azimuth and elevation of the antenna and the adjustment of the angle of polarization when installing the antenna.

A second object is to estimate the presence or absence of the polarization plane angle deviation of the antenna by using the detected reception level, and / or to estimate the degree of the deviation. An object of the present invention is to provide an antenna adjustment method capable of separately performing adjustment and adjustment of a polarization plane angle.

A third object of the present invention is to provide a high-precision polarization plane angle adjusting device using means for accurately detecting the amount of deviation to be adjusted according to the degree of deviation of the polarization plane angle. It is.

A fourth object of the present invention is to obtain a highly accurate polarization plane angle adjustment method by accurately detecting the amount of deviation to be adjusted according to the degree of deviation of the polarization plane angle. is there.

[0024]

A satellite broadcast receiver according to the present invention comprises: means for tuning to a frequency of a reception carrier input to the receiver; and means for detecting reception power of the reception carrier. Means for detecting a demodulated bit error rate of digital data demodulated from a received carrier, and means for determining a magnitude relationship of the detected received power with respect to a predetermined threshold, wherein the demodulated bit with respect to a predetermined threshold is Means for determining the magnitude relationship of the error rates, and means for detecting the presence or absence of a polarization plane angle shift of the antenna based on the magnitude relationship of the determined received power and the magnitude relationship of the determined demodulation bit error rate. It is provided with.

Further, the satellite broadcast receiver according to the present invention includes means for tuning to a frequency of a reception carrier input to the receiver, and means for detecting a reception power level of the reception carrier. A means for identifying received power at an adjacent carrier frequency that is an intermediate position on the frequency axis, between the received carrier and the carrier having the same polarization and arranged adjacently on the frequency axis,
Means for detecting the difference between the received power of the received carrier and the adjacent carrier frequency, means for determining the magnitude relationship of the difference of the received power with respect to a predetermined threshold, and And means for detecting the presence or absence of a polarization plane angle shift of the antenna.

Further, the means for detecting the angle deviation of the polarization plane includes:
A conversion table for associating the difference and the degree (angle) of the angle of polarization plane deviation of the antenna estimated from the difference; It is provided.

[0027] The satellite broadcast receiver according to the present invention may be configured such that the outermost carrier positioned at the end on the frequency axis on one of the two types of polarization planes is:
A carrier-free region further outwardly separated by a frequency corresponding to a half of an interval from at least the outermost carrier on the frequency axis to a carrier on the same polarization plane located adjacent to the outermost outermost carrier. A means for detecting the reception intensity at the receiving carrier, a means for detecting the receiving intensity at the adjacent carrier frequency, and a means for detecting the difference between the non-carrier area and the receiving power at the adjacent carrier frequency. Means for detecting the presence or absence of a polarization plane angle deviation between the reception carrier and the antenna based on the detected difference.

Further, the means for detecting the polarization plane angle deviation includes a conversion table for associating the detected difference with the antenna polarization plane angle deviation amount estimated from the detected difference, and A means for estimating the amount of deviation of the polarization plane angle of the antenna using a conversion table prepared in advance.

Further, the means for detecting the polarization plane angle shift includes means for judging the magnitude of the detected difference with respect to a predetermined threshold value, and the detected difference is determined by the predetermined threshold value. If the difference is greater than, it is determined that there is a polarization plane angle shift, and means for detecting the received carrier and the received intensity at the adjacent carrier frequency are provided, and a difference between the received power at the received carrier and the received power at the adjacent carrier frequency is detected. A conversion table for associating the detected difference with the amount of deviation of the polarization plane angle of the antenna estimated from the detected difference, and using a conversion table prepared in advance based on the detected difference. Means for estimating the amount of deviation of the polarization plane angle of the antenna.

Further, the means for detecting the polarization plane angle shift includes means for detecting the reception power at the reception carrier and the adjacent carrier frequency when the detected difference is smaller than the predetermined threshold value. Means for detecting the difference between the received power at the received carrier and the adjacent carrier frequency, means for determining the magnitude of the detected difference with respect to a predetermined threshold value, wherein the detected difference is If the threshold is larger than the threshold, it is determined that the polarization plane angle deviation is less than or equal to an allowable range. It has means for determining that it is necessary.

In addition, the means for detecting the polarization plane angle shift includes information on the antenna diameter input from the outside and information for specifying the area such as an area code or a postal code of the area where the receiver is installed. By means, comprising means for estimating the expected reception intensity of the received carrier in a normal state, comprising a means for detecting the difference between the estimated value and the received power of the received carrier, for a predetermined threshold, Means for determining the magnitude of the detected difference; determining that the azimuth and elevation settings of the antenna need to be readjusted only when the detected difference is greater than the threshold value; If it is smaller than the threshold value, a means is provided for determining that there is no deviation of the polarization plane angle or that it is within an allowable range.

Further, according to the antenna polarization angle adjusting method of the present invention, the frequency of a specific receiving carrier input to an antenna receiver is tuned, and the receiving power of the receiving carrier is detected. Detecting a demodulated bit error rate of the demodulated digital data;
Determining a magnitude relationship of the detected reception power with respect to a predetermined reception power threshold, and determining a magnitude relationship of the demodulation bit error rate with respect to a predetermined demodulation bit error rate threshold. The presence / absence of the polarization plane angle deviation of the antenna is detected based on the magnitude relationship of the determined received power and the magnitude relationship of the determined demodulation bit error rate.

Further, in the antenna polarization angle adjusting method according to the present invention, the frequency of a specific reception carrier inputted to an antenna receiver is tuned, and the reception power of the reception carrier is detected. And, the carrier having the same polarization as the received carrier and the carrier arranged adjacently on the frequency axis, the step of identifying the received intensity at an adjacent carrier frequency is an intermediate position on the frequency axis,
Detecting the difference between the received power of the received carrier and the adjacent carrier frequency, and having a step of determining the magnitude relationship of the detected difference with respect to a predetermined difference threshold,
The presence or absence of the polarization plane angle deviation of the antenna is detected based on the magnitude relation of the determined difference.

Also, in the antenna polarization angle adjusting method according to the present invention, in the step of detecting the polarization plane angle shift, the detected difference and the antenna polarization plane angle shift estimated from the detected difference are calculated. And a conversion step of associating the antenna with the detected difference and the conversion step, thereby estimating a deviation amount of the polarization plane angle of the antenna.

Further, the antenna polarization angle adjusting method according to the present invention is a polarization angle adjusting method used for a satellite broadcast receiver, and the frequency is adjusted on one of the two types of polarization planes. Of the outermost carrier positioned at the outermost end on the axis, at least on the frequency axis at least from the outermost carrier on the frequency axis to the carrier on the same polarization plane positioned next to the outermost outermost carrier, Detecting a reception intensity in a non-carrier region separated by a frequency corresponding to a half interval; a reception carrier; detecting a reception intensity in the adjacent carrier frequency; A step of detecting a difference in frequency, and detecting whether or not there is a polarization plane angle shift between the receiving carrier and the antenna based on the detected difference.

In the antenna polarization angle adjusting method according to the present invention, in the step of detecting the polarization plane angle deviation, the detected difference and the antenna polarization plane angle deviation amount estimated from the detected difference are calculated. A conversion step of associating the antenna with the detected difference and the conversion step to estimate a deviation amount of the polarization plane angle of the antenna.

Further, in the antenna polarization plane angle adjusting method according to the present invention, the step of detecting the polarization plane angle shift includes the steps of: determining a magnitude of the detected difference with respect to a predetermined difference threshold; If the detected difference is larger than the predetermined difference threshold, it is determined that there is a polarization plane angle shift, and the receiving carrier and the receiving intensity at the adjacent carrier frequency are detected; and A step of detecting a difference in the adjacent carrier frequency, and a conversion step of associating the detected difference with the amount of deviation of the polarization plane angle of the antenna estimated from the detected difference, wherein the detected difference and the conversion step This is for estimating the amount of deviation of the polarization plane angle of the antenna.

In the antenna polarization plane angle adjusting method according to the present invention, in the step of detecting the polarization plane angle shift, when the detected difference is smaller than the predetermined difference threshold,
Detecting the reception intensity at the reception carrier and the adjacent carrier frequency; detecting the difference between the reception power at the reception carrier and the reception power at the adjacent carrier frequency; and It has a step of determining the magnitude, if the detected difference is larger than the predetermined threshold, it is determined that the polarization plane angle deviation is less than or equal to an allowable range, if smaller than the predetermined threshold Is to determine that the reception level is insufficient and that the antenna azimuth and elevation angles need to be adjusted.

Also, in the antenna polarization plane angle adjusting method according to the present invention, in the step of detecting the polarization plane angle shift, the difference between the detected power in the non-carrier region and the detected reception power in the adjacent carrier frequency is the predetermined difference of the predetermined difference. When the value is smaller than the threshold value, reception in a normal state is performed based on information of the antenna diameter input from the outside and information that can specify the area such as an area code and a postal code of the area where the receiver is installed. Estimating the expected received power of the carrier;
A step of detecting an expected difference between the received power of the received carrier and a predetermined threshold of the expected difference; and a step of determining the magnitude of the detected expected difference, wherein the detected expected difference is , Only if it is greater than the expected difference threshold,
It is determined that it is necessary to readjust the setting of the azimuth angle and the elevation angle of the antenna, and if the value is smaller than the threshold value of the expected difference, it is determined that there is no deviation of the polarization plane angle or it is within an allowable range. .

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. In the following description with reference to the drawings, components having the same reference numerals in the drawings are the same or equivalent. Embodiment 1 FIG. FIG. 1 is a front view of a satellite broadcast receiver according to a first embodiment of the present invention, according to the first and ninth embodiments.
It is a block diagram which shows the function of an end part conceptually. In the figure, 1 is a parabolic antenna that receives a radio wave from a satellite and converges at the focal point, and 2 is an L that receives the radio wave converged by the antenna 1 and converts the Ku band to an RF frequency.
NB3 receives the RF signal supplied from LNB2,
A tuner 4 separates the QPSK-modulated signal into an I / Q signal and converts it into a reverse-band signal. An A / D converter 4 quantizes the I / Q baseband signal output from the tuner 3. From the output of the / D converter 4,
A signal power identification unit for detecting the signal power of the tuner output,
Reference numeral 6 denotes a QPSK demodulator for receiving the quantized IQ signal output from the signal power discriminator 5 and performing a phase synchronization process, and then discriminating between an I signal and a Q signal. The error correction units a and 8 for inputting and performing Viterbi decoding receive the output of the error correction unit a7, and the error correction units b and 9 for performing Reed-Solomon error correction input the output of the error correction unit 8,
A transport stream output unit that performs deinterleaving processing or the like and outputs it as an MPEG2 transport stream; 10 is a carrier control unit that controls the oscillation frequency of a local oscillator built in the tuner 3 to match the frequency of the received carrier; Performs a predetermined descrambling process, demultiplexing process, MPEG-2 decoding process, and the like on the transport stream output from the transport stream output unit 10, and outputs a video, an audio signal, and the like. A port stream processing unit 12 is a polarization plane angle detection unit a that identifies a polarization plane angle deviation from the reception power of the reception carrier tuned by the carrier control unit 10 and the error rate state signal from the error correction unit a7. is there.

The outline of the operation in the normal reception state using the satellite broadcast receiver according to the first embodiment of the present invention shown in FIG. 1 is described in the normal reception state in the conventional satellite broadcast receiver shown in FIG. Since the operation is the same as the outline of the operation, the description is omitted.

Next, referring to FIG. 1, Embodiment 1 of the present invention
Of the polarization plane angle adjustment at the time of installation of an antenna will be described. At the time of the conventional polarization plane angle adjustment, the “reception level” estimated by the reception power identification unit 5 is notified to a receiver user by display on a monitor such as a TV or voice output using a GUI or the like. When the antenna is installed, the direction of the antenna (adjustment of azimuth / elevation angle) and the angle of polarization are adjusted by using these notification means. You. Regarding the azimuth angle and the elevation angle, since the adjusting action similarly appears as an increase / decrease of the reception level regardless of the polarization plane of the received signal, the optimum adjustment can be performed by the direction adjustment by the notification means.

On the other hand, in the adjustment of the polarization plane angle, FIG.
As shown in (1), even if the angle of polarization of the antenna is significantly shifted with respect to the plane of polarization of the received signal (desired signal), the reception level itself does not suddenly change. Therefore, when the polarization plane angle is adjusted using the above-described notification means, even if the polarization plane angle of the antenna is not properly adjusted, the reception level is near the maximum value, so that the adjustment can be appropriately performed. It will be judged that it was. However, in practice, FIG.
As can be seen, if the angle of the plane of polarization of the antenna is not properly adjusted with respect to the plane of polarization of the received signal, the signal of the channel adjacent to the reverse plane of polarization of the received signal will increase as an interference signal. Further, it can be seen that since the interference signal increases rapidly as shown in FIG. 28, the signal quality which substantially affects the reception quality is degraded even if the reception level is secured.

FIG. 9 is a diagram showing an example of a procedure for detecting a polarization plane angle shift in the satellite broadcast receiver according to the first embodiment of the present invention. In the figure, BER (Bit Error)
Rate (bit error rate) is determined by using a BER detection function built in the QPSK demodulation unit. This is an example of what is set as a value that is good and can be achieved in a normal reception state. “Received power” is calculated from a satellite output (EIRP) and is calculated by using a general parabolic antenna (45 cm and 60 cm).
The diameter is set as a reception level that can be achieved in a normal reception state, for example, -35 dBm. This value is not directly detected, but is indirectly detected by, for example, an AGC control signal for the tuner.

FIG. 17 is a block diagram showing the internal configuration of the polarization plane angle detector a12, which is a component of FIG. In the figure, reference numeral 27 denotes a reception power judgment unit for inputting a reception level identified by the reception power identification unit 5 and judges a result of comparison with a predetermined threshold, and 28 denotes a BE from an error correction unit a7.
A BER determining unit that receives R data and determines a result of comparison with a predetermined threshold, 29 is a received power determining unit 27, B
The state determination unit a determines whether there is a polarization plane angle shift based on the determination result of the ER determination unit 28.

9, 17, and 1, the polarization plane angle detection unit 12 receives the “reception level” from the reception power identification unit 5 and the error state signal from the error correction unit a 7. In the reception power determination unit 27, when the input reception level is determined to be equal to or higher than a predetermined threshold, a flag signal indicating the reception level is good, and when it is determined that the reception level is equal to or lower than the threshold, A flag signal indicating a reception level failure is output to state determination unit a29. BER determination unit 28
Then, when it is determined that the input BER data is equal to or smaller than a predetermined threshold, a flag signal indicating good reception quality is set, and when it is determined that the input BER data is equal to or larger than the threshold, a flag indicating bad reception quality is set. A signal is output to state determination unit a29. The state determination unit a29 performs the following three types of determination and operation based on the combination of the two input flag signals. 1) If the reception quality failure flag is input and the reception level failure flag is input, it is determined that the reception level has not been secured by antenna adjustment, and "the antenna azimuth and elevation angle need to be adjusted". And ends the polarization plane angle detection operation. 2) When the good reception quality flag is input, regardless of the reception level, it is determined that the polarization plane angle adjustment is good, and it is notified that "polarization plane angle adjustment is unnecessary", and the polarization plane angle detection operation ends. 3) When the poor reception quality flag is input and the good reception level flag is input, it is determined that the polarization plane angle adjustment is insufficient, and a notification that "polarization plane angle adjustment is necessary" is issued, and the state determination operation is continued. I do. In addition, the notified state is notified to the antenna installer through a monitor such as a TV by video or audio or both. Also, B, which is a reference for state determination,
As the ER threshold, a QPSK demodulation bit error rate or the like is used to realize an “error free” state in which no noise or image disturbance is felt when the output video / audio of the receiver is viewed on a monitor or the like. For example, demodulation error rate 10-3
Are set in advance.

As described above, in the first embodiment of the present invention, the frequency of the receiving carrier input to the receiver is tuned, the receiving power of the receiving carrier is detected, and the digital data demodulated from the receiving carrier is detected. The demodulation bit error rate is detected, the magnitude relation of the detected reception power with respect to a predetermined threshold is determined, and the magnitude relation of the demodulation bit error rate with respect to a predetermined threshold is determined. By acting on the magnitude relationship of the received power and the magnitude relationship of the determined demodulation bit error rate to detect the presence or absence of the polarization plane angle shift of the antenna, the antenna can be installed without adding special hardware. Azimuth and elevation adjustments and polarization plane angle adjustments can be distinguished and recognized during attitude adjustment, and antenna adjustment with higher accuracy than conventional satellite broadcast receivers It can be carried out easily.

Embodiment 2 In the first embodiment, the polarization plane angle detector a11 determines the presence or absence of the polarization plane angle deviation based on the reception power of the received carrier and the BER after QPSK. It reacts sensitively to changes in the reception status. For this reason,
By comparing the reception power at the reception carrier frequency and the reception power at the adjacent carrier frequency, the polarization plane angle adjustment can be performed in more detail and easily.

FIG. 2 shows a front view of a satellite broadcast receiver according to a second embodiment of the present invention.
It is a block diagram which shows the function of an end part conceptually. In the figure, 13 is on the same polarization plane as the receiving carrier,
1/2 of the frequency interval to an adjacent carrier, for example, 3
When carriers are arranged on the same polarization plane at intervals of 0 MHz, an adjacent carrier control unit which generates a control signal so as to tune to a frequency higher or lower than the reception carrier frequency by 15 MHz, and 14 is a carrier control unit 10 And a carrier selection unit for selecting a control signal from the adjacent carrier control unit 13 and outputting the control signal to the tuner 3. The carrier selection units a and 15 compare the reception power of the reception carrier input from the reception power identification unit 5 with the reception power of the adjacent carrier, and The polarization plane angle detector b detects the power ratio corresponding to the D / U ratio at the carrier frequency and determines whether there is a polarization plane angle shift.

The outline of the operation in the normal reception state using the satellite broadcast receiver according to the second embodiment of the present invention shown in FIG. 2 will be described with reference to FIG. The description is omitted because it is the same.

FIG. 10 shows an example of a procedure for detecting a polarization plane angle shift in the satellite broadcast receiver according to the second embodiment of the present invention. In FIG. 10, (Pc−Pu) representing the ratio of the received power Pc at the received carrier frequency to the received power Pu at the adjacent carrier frequency is a D / U ratio (Desire / Undesire) for the received carrier.
Ratio). Also, in CS digital broadcasting generally operated in Japan, C / N for normal reception using a commercially available parabolic antenna.
The (Carrier / Noise) ratio is assumed to be about 12 dB, and the D / U ratio detected during normal reception, that is, (Pc−Pu) can be considered to be about 12 dB.

FIG. 18 is a block diagram showing the internal configuration of the polarization plane angle detector b15, which is a component of FIG. In the figure, reference numeral 30 denotes a carrier position reception unit for storing a received power level at a carrier position, 31 denotes an adjacent carrier position received power storage unit for storing a received power level at an adjacent carrier position, and 32 denotes a carrier position and an adjacent carrier position. A state determination unit b that determines the state of polarization plane angle shift by comparing the received power levels of the two.

In FIG. 10, FIG. 18 and FIG. 2, assuming that the center frequency of the received carrier is 12.538 GHz and each carrier on the same polarization plane has a band of 27 MHz and is arranged at intervals of 30 MHz, the adjacent carrier frequency becomes 1
It becomes 2.538 GHz ± 15 MHz. When the polarization plane angle of the LNB is shifted from the polarization plane angle of the received carrier, these two adjacent carriers are generated as interference signals. In satellite broadcasting, one carrier is generally transmitted per transponder (repeater) of a satellite, and the output level difference between the transponders is about 1 dB or less. Therefore, the level of the interfering signals generated on both sides of the receiving carrier is almost the same level. By observing the level of one of the interfering signals and comparing the level of the interfering signal with the signal level of the receiving carrier, D / U ratio can be detected.

The reception level in the normal reception state using the correctly installed antenna is the satellite output (EIRP)
And the receiving antenna performance (G / T ratio) and the noise level of the receiver, taking into account the influence of weather conditions in the transmission / reception area. In the case of CS digital satellite broadcasting generally operated in Japan, the EIRP is about 54 W, and the reception level using a general 45 cm diameter parabolic antenna is C The / N ratio is about 12 dB. Therefore, in a normal reception state in which no adjacent carrier is generated as an interference signal, the D / U ratio detected by the above procedure is generally about 12 dB. If the detected value is extremely deteriorated from about 12 dB, which is a measure of the normal reception state, it is possible to detect the deviation of the antenna polarization plane angle.

When the polarization plane angle detection operation is started, the control signal generated by the carrier control unit 10 is selected by the carrier selection unit a14 and input to the tuner 3, and is tuned to the reception carrier frequency (12.538 GHz). Is done. After tuning to the received carrier frequency, the received power Pc at the carrier position is detected by the received power identification unit 5 and stored in the polarization plane angle detection unit 15. Next, the adjacent carrier control unit 13 uses one of two adjacent carrier frequencies for the received carrier, for example, 12.493.
A control signal for tuning to GHz is generated,
The signal is selected by the carrier selection unit a14 and input to the tuner 3. After tuning to the adjacent carrier frequency, the reception power detector 5 detects the reception power Pu at the adjacent carrier position.
Are detected and stored in the polarization plane angle detection unit 15.

In the polarization plane angle detection unit b15, the reception levels Pc and Pc stored in the carrier position reception power storage unit 30 and the adjacent carrier position reception power storage unit 31, respectively.
u is output to the state determination unit b32. State determination unit b3
In 2, the input Pc and Pu are compared, and if (Pc-Pu) corresponding to the D / U ratio is 12 dB or more, it means that the signal quality is equal to or higher than the signal quality expected in a normal reception state. Therefore, it is determined that there is no interfering signal due to the adjacent carrier or that it is below a detectable level,
Using one or both of audio and video, output a status notification signal to notify that "the polarization plane angle deviation is within the allowable range and there is no need to adjust the polarization plane angle" to detect the polarization plane angle. The operation ends, and the operation returns to the normal reception operation.

When (Pc−Pu) is 12 dB or less, the state determination unit b32 determines that the signal quality assumed in the normal reception state is deteriorated by an interference signal due to an adjacent carrier, and “the polarization plane angle shift is It is necessary to output a state notification signal to notify that "the polarization plane angle needs to be readjusted because it is outside the allowable range", and whether the antenna adjuster (viewer) releases the polarization plane angle detection mode using a remote controller or the like. , Pc and Pu detection, D / U ratio calculation / determination, and D / U ratio of 12
It repeats until it becomes dB or more and it is determined that "the polarization plane angle adjustment is unnecessary".

As described above, in the second embodiment of the present invention, the frequency of the receiving carrier input to the receiver is tuned, the receiving power level Pc of the receiving carrier is detected, and the receiving carrier and the receiving carrier are detected. The received power Pu at the adjacent carrier frequency, which is the intermediate position on the frequency axis, between the carriers having the same polarization and arranged adjacently on the frequency axis is identified. By detecting a certain (Pc-Pu), judging the magnitude relation of (Pc-Pu) with respect to a predetermined threshold value, and detecting whether or not there is a deviation of the polarization plane angle of the antenna, the required polarization plane angle is obtained. Since the amount of adjustment is reported in detail, when installing the antenna, the antenna installer performs the adjustment of the azimuth and elevation angles and the adjustment of the polarization plane angle in the process of adjusting the antenna attitude. It can yet easily performed with high polarization angle adjusting precision.

Embodiment 3 In the second embodiment, the polarization plane angle detection unit b15 detects and compares the presence or absence of the LNB polarization plane angle deviation by comparing and judging the reception power at the reception carrier frequency and the reception power at the adjacent carrier frequency. However, by using the D / U ratio-polarization plane angle conversion table as shown in FIG. 3 and detecting the degree of the polarization plane angle deviation, the accuracy of the polarization plane angle deviation detection can be improved.

FIG. 3 shows a front view of a satellite broadcast receiver according to a third embodiment of the present invention, which is a third embodiment of the present invention.
It is a block diagram which shows the function of an end part conceptually. In the figure, reference numeral 16 compares the received power of the received carrier and the received power of the adjacent carrier input from the received power identification unit 5, inputs the comparison result to a D / U ratio-polarization plane angle conversion table 17 described later, and obtains the comparison result. The polarization plane angle detectors c and 17 that obtain the estimated value of the polarization plane angle deviation and determine the degree of the polarization plane angle deviation are based on the relationship between the D / U ratio and the polarization plane angle deviation amount obtained in advance from experimental values or the like. It is a D / U ratio-polarization plane angle conversion table configured based on the above. The outline of the operation in the normal reception state using the satellite broadcast receiver according to the third embodiment of the present invention shown in FIG. 3 is the same as that of the satellite broadcast receiver according to the first embodiment of the present invention shown in FIG. Omitted.

[0061]

[Table 2]

Table 2 above is a correspondence table showing the relationship between the D / U ratio and the polarization plane angle shift amount. Here, instead of experimental values,
The state of increase / decrease of the received signal (desired signal) and the adjacent carrier signal (jam signal) due to the polarization plane angle shift is obtained from the calculated values and is shown as a correspondence table.

FIG. 11 is a diagram showing an example of a procedure for detecting a polarization plane angle shift in the satellite broadcast receiver according to the third embodiment of the present invention. As in FIG. 10, in FIG. 11, (Pc−Pu) is represented by D / U
It is assumed that the C / N ratio at the time of normal reception using a commercially available parabolic antenna is about 12 dB.

FIG. 19 is a block diagram showing the internal configuration of the polarization plane angle detector c16, which is a component of FIG. In the figure, reference numeral 33 denotes a D / U ratio calculation unit which compares the received power levels at the carrier position and the adjacent carrier position, and outputs the comparison result to the D / U ratio-polarization plane angle conversion table 17;
The state determination unit c determines the state of deviation of the polarization plane angle based on the polarization plane angle deviation data input from the / U ratio-polarization plane angle conversion table 17.

In FIGS. 11, 19 and 3, FIG.
2 and the center frequency of the received carrier is 12.538 GHz, and each carrier on the same polarization plane is arranged at a bandwidth of 27 MHz and at an interval of 30 MHz, as in FIG.
Adjacent carrier frequency is 12.538GHz ± 15MHz
And

When the polarization plane angle detection operation is started, the control signal generated by the carrier control section 10 is selected by the carrier selection section 14 and input to the tuner 3 to tune to the reception carrier frequency (12.538 GHz). Is done. After tuning to the received carrier frequency, the received power Pc at the carrier position is detected by the received power detector 5 and stored in the polarization plane angle detector c16. Next, the adjacent carrier control unit 13 tunes to 12.493 GHz which is the adjacent carrier frequency. After tuning to the adjacent carrier frequency, the received power Pu at the adjacent carrier position is detected by the received power detection unit 5 and stored in the polarization plane angle detection unit c16.

The polarization plane angle detection section c16 calculates the D / U ratio calculation section 33 from the data stored in the carrier position reception power storage section 30 and the data stored in the adjacent carrier position reception power storage section 31.
, The D / U ratio is calculated, and the D / U ratio data is
It is output to the ratio-polarization plane angle conversion table 17. D / U
In the ratio-polarization plane angle conversion table, based on the input D / U ratio data, conversion of the D / U ratio and the polarization plane angle shift amount configured in advance by experimental values and the like as shown in Table 2 is performed. , And outputs polarization plane angle data. The polarization plane angle data is input to the state determination unit c34, and when the D / U ratio (Pc-Pu) is 12 dB or more, the state determination unit c34 determines that the signal quality is equal to or higher than the signal quality expected in the normal reception state. Therefore, it is determined that there is no interfering signal due to the adjacent carrier or that the level is below a detectable level. It is notified that there is no need to adjust the wavefront angle ", the polarization plane angle detection operation ends, and the operation returns to the normal reception operation.

If the D / U is 12 dB or less, it means that the signal quality expected in the normal reception state may be degraded by an interfering signal caused by an adjacent carrier. Pu) is input to the D / U ratio-polarization plane angle conversion table 16, and the polarization plane angle shift amount is estimated.
"Polarization plane angle deviation is out of the allowable range, and the generated angle deviation is estimated to be about XX degrees" (XX is a numerical value indicating the detected deviation), and the antenna adjuster (viewer ) Cancels the polarization plane angle detection mode by operation of a remote controller or the like, or detects Pc and Pu, calculates D / U ratio,
The determination is repeated until the D / U ratio becomes 12 dB or more and it is determined that "the polarization plane angle adjustment is not necessary". According to Table 2, for example, the detected polarization plane angle shift amount is estimated to be about 18 degrees if the D / U ratio is 10 dB.

As described above, in the third embodiment of the present invention, the amount of deviation of the angle of polarization of the antenna is estimated using the conversion table for associating the amount of deviation of the angle of polarization of the antenna estimated from the D / U ratio. In this way, when the antenna is installed, the required amount of polarization plane angle adjustment is reported in detail, so that the antenna installer can adjust the azimuth and elevation and adjust the polarization plane during the antenna attitude adjustment work. Angle adjustment can be performed separately, and highly accurate polarization plane angle adjustment can be easily performed.

Embodiment 4 In the third embodiment, the polarization plane angle detection unit c16 compares and determines the received carrier frequency and the received power at the adjacent carrier frequency, thereby obtaining the D / U ratio-polarization plane angle conversion table 17.
Is used to detect the presence or absence of a polarization plane angle shift of the LNB. However, as shown in FIG. 4, reception power at a non-carrier position (frequency) where no carrier exists on both polarization planes, By comparing the received power with the adjacent carrier frequency, the presence / absence of the polarization plane angle shift can be detected with higher accuracy.

FIG. 4 shows a front view of a satellite broadcasting receiver according to a fourth embodiment of the present invention.
It is a block diagram which shows the function of an end part conceptually. In the figure, 18 is on the same polarization plane as the receiving carrier,
A non-carrier control unit that performs control so as to tune to a carrier-free frequency region 15 MHz further away from the carrier at the end on the frequency axis, and 19 is a carrier control unit 10, an adjacent carrier control unit 13, A tuner 3 is selected by selecting a control signal of the carrier control unit 18.
The carrier selection units b and 20 output to the reception power identification unit 5
The polarization plane angle detection unit d compares the received power of the adjacent carrier and the non-carrier frequency input from the apparatus, and estimates the presence or absence of the polarization plane angle deviation from the comparison result.

The outline of the operation in the normal reception state using the satellite broadcast receiver according to the fourth embodiment of the present invention shown in FIG. 4 will be described with reference to the satellite broadcast receiver according to the first embodiment of the present invention shown in FIG. The description is omitted because it is the same.

FIG. 12 is a diagram showing an example of a procedure for detecting a polarization plane angle shift in the satellite broadcast receiver according to the fourth embodiment of the present invention. In the figure, (Pu-Pn) represents the reception power ratio between the adjacent carrier position and the non-carrier position, and the adjacent carrier position where the carrier exists at a distance of 15 MHz on both sides and the non-carrier where the carrier exists at a distance of 15 MHz only on one side. Due to the position, it is assumed that the power ratio is about 3 dB in the normal reception state.

FIG. 20 is a block diagram showing the internal configuration of the polarization plane angle detector d20, which is a component of FIG. In the figure, 35 is on the same polarization plane as the receiving carrier,
A non-carrier position reception power storage unit that stores reception power at a frequency position where there is no carrier further 15 MHz away from the carrier at the end on the frequency axis, and 36 is the reception power at the adjacent carrier position and the non-carrier position. The state determination unit d compares the levels and determines whether there is a polarization plane angle shift based on the comparison result.

In FIGS. 12, 20 and 4, the center frequency of the received carrier is 12.508 GHz, and each carrier on the same polarization plane has a band of 27 MHz and a frequency of 30 MHz.
Are placed at intervals and the adjacent carrier frequency is 12.523G
Hz and the non-carrier frequency are 12.493 GHz.

The polarization plane angle detection unit d20 detects the polarization plane angle deviation using the reception power values Pu and Pn at the adjacent carrier and non-carrier frequencies detected by the reception power identification unit 5. Pu and Pn stored in the adjacent carrier position received power storage unit 31 and the non-carrier position received power storage unit 35 are input to the state determination unit d36 and compared. At the non-carrier frequency, even if the polarization plane angle shift occurs, there is no carrier at the corresponding frequency on the reverse polarization plane, so that there is basically no change in received power. On the other hand, at the adjacent carrier frequency, when there is no polarization plane angle shift, the reception power value P
u is about 3 dB larger than Pn. this is,
In the case of the satellite broadcast receiver according to the fourth embodiment of the present invention shown in FIGS. 11 and 4, the non-carrier frequency is set at a position 15 MHz away from the outermost carrier on the frequency axis on the polarization plane. This is because, at this position, the side lobe of the outermost carrier is affected, and at the adjacent carrier position, the side lobes of the carriers located on both sides are affected. For this reason, when there is a polarization plane angle shift in the state determination unit d36, (Pu-Pn) increases from 3 dB because an interference signal generated at an adjacent carrier position is further added to the power difference of 3 dB. Therefore, Pu and Pn are compared, and when Pu is larger than Pn by a certain value or more, it can be determined that the polarization plane angle shift exists.

When the state determination unit d36 determines that there is a polarization plane angle shift, it notifies that "polarization plane angle adjustment is necessary", and detects and compares the received powers of the adjacent carrier position and the non-carrier position. The determination is continued until it is determined that the polarization plane angle deviation has disappeared, or until the antenna adjuster cancels the polarization plane angle detection mode, and when it is determined that the polarization plane angle deviation does not exist, the `` polarization plane angle deviation '' is determined. No adjustment is required ", and the polarization plane angle detection mode ends.

As described above, in the fourth embodiment of the present invention, reception intensity Pn at a non-carrier frequency position is detected, reception intensity Pu at an adjacent carrier frequency position is detected, and the ratio of Pn to Pu ( (Pu−Pn), and works to detect the presence or absence of the polarization plane angle shift, and thereby the presence or absence of the polarization plane angle shift required at the time of installing the antenna is (Pu−Pn).
−Pn), it is possible to easily perform highly accurate polarization plane angle adjustment.

Embodiment 5 FIG. In the fourth embodiment, (Pu−Pn) is used in the polarization plane angle detection unit d20.
Is greater than or equal to a certain value, it is determined that there is a polarization plane angle shift, and if it is less than or equal to a certain value, it is determined that there is no polarization plane angle shift. However, as shown in FIG. When the value is equal to or more than the value, by using the Pu / Pn ratio-polarization plane angle conversion table, more accurate polarization plane angle adjustment can be performed.

FIG. 5 shows a front view of a satellite broadcast receiver according to a fifth embodiment of the present invention.
It is a block diagram which shows the function of an end part conceptually. In the figure, reference numeral 21 compares the received power of the adjacent carrier and the non-carrier frequency input from the received power identification unit 5, and inputs the comparison result to a Pu / Pn ratio-polarization plane angle conversion table 22 described later. The obtained polarization plane angle deviation estimated value is obtained, and the polarization plane angle detection units e and 22 that determine the presence or absence of the polarization plane angle deviation have Pu /
6 is a Pu / Pn ratio-polarization plane angle conversion table configured based on the relationship between the Pn ratio and the polarization plane angle shift amount.

The outline of the operation in the normal reception state using the satellite broadcast receiver according to the fifth embodiment of the present invention shown in FIG. 5 will be described with reference to FIG. The description is omitted because it is the same.

FIG. 13 is a diagram showing an example of a procedure for detecting a polarization plane angle shift in the satellite broadcast receiver according to the fifth embodiment of the present invention. As in FIG. 12, (Pu-Pn) in FIG. 13 represents the reception power ratio between the adjacent carrier position and the non-carrier position, and has a power ratio of about 3 dB in the normal reception state.

FIG. 21 is a block diagram showing the internal configuration of the polarization plane angle detector e21, which is a component of FIG. In the figure, reference numeral 37 denotes a Pu / Pn ratio calculating unit for comparing the received power level between the adjacent carrier position and the non-carrier position and outputting the comparison result to the Pu / Pn ratio-polarization plane angle conversion table 22; -Polarization plane angle conversion table 22
A state determination unit e that determines the state of deviation of the polarization plane angle based on the polarization plane angle deviation data input from.

In FIGS. 13, 21 and 5, the center frequency of the received carrier is 12.508 GHz, and each carrier on the same polarization plane has a band of 27 MHz and a frequency of 30 MHz.
Are placed at intervals and the adjacent carrier frequency is 12.523G
Hz and the non-carrier frequency are 12.493 GHz.

The polarization plane angle detection unit e21 uses the reception power values Pu and Pn at the adjacent carrier position and the non-carrier position stored in the adjacent carrier position reception power storage unit 31 and the non-carrier position reception power storage unit 35, respectively. In the Pu / Pn ratio calculation unit 37, the power ratio (Pu−
Pn) is calculated and output to the Pu / Pn ratio-polarization plane angle conversion table 22. In the Pu / Pn ratio-polarization plane angle conversion table 22, based on the input Pu / Pn ratio data, the Pu / Pn ratio and the polarization plane angle shift amount configured in advance by experimental values and the like are converted, and the polarization plane angle is converted. Output data.

As described above, in a normal reception state,
The Pu / Pn ratio becomes about 3 dB. When the polarization plane angle shift exists, the reception power at the adjacent carrier position corresponding to the carrier position on the reverse polarization plane increases, but the reception power at the non-carrier position not at the carrier position on the reverse polarization plane hardly changes. Therefore, the Pu / Pn ratio increases with the polarization plane angle shift. The correspondence between the change in the Pu / Pn ratio and the deviation of the polarization plane angle is obtained in advance by experiments or the like, and is reflected in the Pu / Pn ratio-polarization plane angle conversion table. In the Pu / Pn ratio-polarization plane angle conversion table, the polarization plane angle estimated from the input Pu / Pn ratio data is converted into a state determination unit e.
38.

The state determination section e38 determines the state of polarization plane angle shift based on the polarization plane angle data. If it is determined that the normal reception state, using either or both of the audio and video, to notify that "the polarization plane angle deviation is within the allowable range, there is no need to adjust the polarization plane angle", the polarization plane angle The detection operation ends, and the operation returns to the normal reception operation. If it is determined that the reception state has a polarization plane angle shift, using the polarization plane angle data and using one or both of the audio and the video, the message `` Polarization plane angle shift is out of the allowable range and occurred. Is estimated to be about XX degrees "(XX is a numerical value indicating the detected shift amount).
The antenna adjuster (viewer) operates the remote control or the like,
The polarization plane angle detection mode is canceled or the Pu / Pn detection and Pu / Pn ratio calculation / judgment are performed when the Pu / Pn ratio is 3d.
It repeats until it becomes about B, and it is determined that "the polarization plane angle adjustment is unnecessary".

As described above, in the fifth embodiment of the present invention, the means for detecting the polarization plane angle shift is Pu / Pn
By detecting the ratio, and working to estimate the amount of deviation of the angle of polarization of the antenna by using a conversion table that associates the Pu / Pn ratio prepared in advance with the amount of deviation of the angle of polarization of the antenna, the polarization required for installation of the antenna can be obtained. Since the wavefront angle adjustment amount is concretely notified, highly accurate polarization plane angle adjustment can be easily performed.

Embodiment 6 FIG. In the fifth embodiment, (Pu−Pn) in the polarization plane angle detection unit e21.
Is greater than or equal to a certain value, it is determined that there is a polarization plane angle deviation, and the presence / absence of the polarization plane angle deviation is detected using (Pu-Pn) using a Pu / Pn ratio-polarization plane angle conversion table. However, as shown in FIG. 6 and FIG.
(u-Pn) is equal to or more than a certain value, (Pc-P
By performing the detection of u), the polarization plane angle shift amount can be detected with higher accuracy.

FIG. 6 shows a front view of a satellite broadcast receiver according to a sixth embodiment of the present invention.
It is a block diagram which shows the function of an end part conceptually. In the figure, reference numeral 23 denotes P detected by the received power identification unit 5.
Based on c, Pu and Pn, (Pu−Pn) is detected,
A polarization plane angle detection unit f that detects (Pc-Pu).

The outline of the operation in the normal reception state using the satellite broadcast receiver according to the sixth embodiment of the present invention shown in FIG. 6 will be described with reference to FIG. The description is omitted because it is the same.

FIG. 14 is a diagram showing an example of a procedure for detecting a polarization plane angle shift in the satellite broadcast receiver according to the sixth embodiment of the present invention. In the figure, (Pc-Pu) represents the D / U ratio for the receiving carrier, and the C / N ratio for normal reception using a commercially available parabolic antenna is 12d.
B is assumed. Also, (Pu-Pn) represents the reception power ratio between the adjacent carrier position and the non-carrier position, and has a power ratio of about 3 dB in the normal reception state.

FIG. 22 is a block diagram showing the internal configuration of the polarization plane angle detector f23, which is a component of FIG. In the figure, reference numeral 39 denotes a D / U ratio-polarization plane angle conversion table 1
7. A state determination unit f that determines a state of deviation of the polarization plane angle based on each data input from the D / U ratio calculation unit 33 and the Pu / Pn ratio calculation unit 37.

In FIGS. 14, 22 and 6, the center frequency of the received carrier is 12.508 GHz, and each carrier on the same polarization plane has a band of 27 MHz and a frequency of 30 MHz.
Are placed at intervals and the adjacent carrier frequency is 12.523G
Hz and the non-carrier frequency are 12.493 GHz.

As described above, when (Pu−Pn) is about 3 dB, it is considered that there is no polarization plane angle shift, and 3 dB
In the above case, it is considered that there is a polarization plane angle shift.
The presence or absence of the polarization plane angle shift is P which is hardly influenced by the reception situation.
The accuracy is better based on the u / Pn ratio, but when there is a polarization plane angle shift, the actual reception level in the normal reception state fluctuates slightly depending on the situation of the reception point. Estimation of the deviation amount is more accurate when performed based on the Pc / Pu ratio corresponding to the D / U ratio, than when performed based on the Pu / Pn ratio. Therefore, the presence or absence of the polarization plane angle deviation is determined from the Pu / Pn ratio, and the degree of the polarization plane angle deviation is determined as Pc / Pu.
It is determined from the ratio.

In the polarization plane angle detection unit f23, the received carrier position, the adjacent carrier position, and the received carrier position stored in the carrier position received power storage unit 30, the adjacent carrier position received power storage unit 31, and the non-carrier position received power storage unit 35, respectively. Received power values Pc, Pu at non-carrier positions
And Pn, the Pu / Pn ratio (Pu−P
n), and outputs the detection result to the state determination unit f39.
It is detected whether (Pu−Pn) is a value (about 3 dB) assumed in the normal reception state. (Pu-
If Pn) is about 3 dB, it is determined that the reception is normal, and the audio or video signal is output regardless of the output of the D / U ratio calculator 33 and the output of the D / U ratio-polarization plane angle conversion table 17. , Or both of them is notified that "the polarization plane angle adjustment is not necessary", and the polarization plane angle detection ends.

When (Pu−Pn) is equal to or more than 3 dB, the state determination unit f39 corresponds to the D / U ratio (Pc−Pn−Pn).
Pu) is detected, and when the D / U ratio is 12 dB or more,
The polarization plane angle deviation detected in (Pu−Pn) is determined to be within the allowable range, and “the polarization plane angle deviation is within the allowable range” using the audio and / or video signal.
And the polarization plane angle detection ends. D / U ratio is 1
If it is 2 dB or less, the D / U ratio data output from the D / U ratio calculation unit 33 is used to calculate the polarization plane based on the polarization plane angle data output from the D / U ratio-polarization plane angle conversion table 17. The degree of the angle shift is detected, and the voice and / or video signal indicates that “the polarization plane has an angle shift. X
An adjustment of about X degrees is required ”(XX: estimated polarization plane angle shift amount), the viewer adjusts the antenna, and (P
(Pu-Pn), (Pc-Pu) detection, and polarization plane angle deviation notification are performed until (u-Pn) becomes about 3 dB or the viewer cancels the polarization plane angle detection mode by operating a remote controller or the like. Repeated.

As described above, in the sixth embodiment of the present invention, the means for detecting the angle deviation of the polarization plane determines (Pu−Pn) with respect to a predetermined threshold value, and determines (Pu−Pn).
If (Pn) is larger than a predetermined threshold, it is determined that there is a polarization plane angle shift, and (Pc-Pu) is detected.
Since the amount of deviation of the plane of polarization of the antenna estimated from (Pc−Pu) is obtained from a conversion table prepared in advance, the amount of adjustment of the plane of polarization required at the time of installation of the antenna is specifically reported. In addition, highly accurate polarization plane angle adjustment can be easily performed.

Embodiment 7 FIG. In the sixth embodiment, when (Pu−Pn) is equal to or more than a certain value, the polarization plane angle detection unit 21 detects (Pc−Pu), that is, the D / U ratio, and the D / U ratio is constant. If the value is less than or equal to the value, it is determined that adjustment of the antenna azimuth angle and the elevation angle is necessary, and (P
When u-Pn) is low, the antenna azimuth angle and elevation angle adjustment are distinguished from the polarization plane angle adjustment.
As shown in FIG. 5, when (Pu−Pn) is equal to or less than a certain value and (Pc−Pu) is equal to or more than a certain value, it is determined that the reception state is stable without the need for the polarization plane angle adjustment,
When (Pu−Pn) is equal to or less than a certain value and (Pc−Pu) is equal to or less than a certain value, it is determined that the received power is insufficient, and it is specified that the antenna azimuth angle and elevation angle adjustment are necessary. be able to.

FIG. 7 shows a front view of a satellite broadcast receiver according to a seventh embodiment of the present invention.
It is a block diagram which shows the function of an end part conceptually. FIG.
, 24 is the P detected by the received power identification unit 5.
Based on c, Pu and Pn, (Pu−Pn) is detected,
(Pc−Pu) is a polarization plane angle detection unit g that estimates the polarization plane angle deviation.

The outline of the operation in the normal reception state using the satellite broadcast receiver according to the seventh embodiment of the present invention shown in FIG. 7 will be described with reference to the satellite broadcast receiver according to the first embodiment of the present invention shown in FIG. The description is omitted because it is the same.

FIG. 15 is a diagram showing an example of a procedure for detecting a polarization plane angle shift in the satellite broadcast receiver according to the seventh embodiment of the present invention. As in FIG. 14, also in FIG. 15, (Pc−Pu) indicates the D / U for the reception carrier.
It is assumed that the C / N ratio at the time of normal reception using a commercially available parabolic antenna is about 12 dB. Also, (Pu-Pn) represents the reception power ratio between the adjacent carrier position and the non-carrier position, and has a power ratio of about 3 dB in the normal reception state.

FIG. 23 is a block diagram showing the internal configuration of the polarization plane angle detector g24, which is a component of FIG. In the figure, reference numeral 40 denotes a D / U ratio-polarization plane angle conversion table 17
And a state determination unit g that determines the state of deviation of the polarization plane angle based on the polarization plane angle deviation data input from the Pu / Pn ratio-polarization plane angle conversion table.

In FIGS. 15, 23 and 5, the center frequency of the received carrier is 12.508 GHz, and each carrier on the same polarization plane has a band of 27 MHz and a frequency of 30 MHz.
Are placed at intervals and the adjacent carrier frequency is 12.523G
Hz and the non-carrier frequency are 12.493 GHz.

The polarization plane angle detector g24 detects the polarization plane angle deviation using Pc, Pu and Pn detected by the received power identification section 5. When the polarization plane angle detection operation is started, the Pu / Pn ratio calculation unit 37 first calculates (P
u-Pn) is detected and input to the state determination unit g40. When (Pu−Pn) is about 3 dB, D / U
The D / U ratio data detected by the ratio calculation unit is input to the state determination unit 40, and it is determined whether the D / U ratio is equal to or greater than 12 dB. When the D / U ratio is equal to or more than 12 dB, it is determined that there is no polarization plane angle deviation and the reception power is sufficient, and "no polarization plane angle deviation" is reported using the audio or video signal or both. Then, the polarization plane angle detection ends. If the D / U ratio is 12 dB or less, there is no polarization plane angle shift, but it is determined that the received power is insufficient, and "no polarization plane angle shift. Antenna azimuth using audio and / or video signals. "Adjustment of angle / elevation angle is required" and the polarization plane angle adjustment is terminated.

If (Pu−Pn) is about 3 dB or more, or the polarization plane angle data output from the Pu / Pn ratio-polarization plane angle conversion table is a value assumed to be 12 dB or less for the D / U ratio. In this case, the D / U ratio data detected by the D / U ratio calculation unit is input to the state determination unit 40, and it is determined whether the D / U ratio is 12 dB or more. When the D / U ratio is 12 dB or more, it is determined that there is no polarization plane angle deviation, but there is no problem in the reception quality, and “within the polarization plane angle deviation allowable range” using the audio or video signal or both. And the detection of the polarization plane angle is terminated. When the D / U ratio is 12 dB or less, it is determined that the polarization plane angle shift exists and the received power is insufficient, and the polarization plane angle data input from the D / U ratio-polarization plane angle conversion table is used. The deviation angle is estimated on the basis of the above, the “polarization plane angle deviation XX is present, need to be adjusted” is notified using the audio and / or video signals, and the D / U ratio is 1
The detection of the polarization plane angle is continued until it is detected that it has become about 2 dB or more or the viewer cancels the polarization plane angle detection mode using a remote controller or the like.

As described above, in the seventh embodiment of the present invention, the means for detecting the polarization plane angle shift is Pu / Pn
If the ratio is smaller than a predetermined threshold, the D / U ratio is detected, and the magnitude of the D / U ratio is determined with respect to a predetermined threshold. When the antenna is determined to be less than or equal to the allowable range and is smaller than the predetermined threshold, the reception level is insufficient, and it works to determine that the antenna azimuth and elevation angles need to be adjusted. Since the required amount of polarization plane adjustment is reported in a specific and highly accurate manner, the antenna installer can perform azimuth and elevation adjustment and polarization plane angle adjustment separately in the process of antenna attitude adjustment, and Highly accurate polarization plane angle adjustment can be easily performed.

Embodiment 8 FIG. In the seventh embodiment, (Pu−Pn) is used in the polarization plane angle detection unit g24.
Is less than a certain value, (Pc−Pu), that is, D / U
By detecting the ratio and determining that the antenna azimuth and elevation need to be adjusted when the D / U ratio is below a certain value,
When (Pu−Pn) is low, the antenna azimuth and elevation angle adjustments are distinguished from the polarization plane angle adjustment. However, as shown in FIGS. 8 and 16, when (Pu−Pn) is equal to or less than a certain value, The area of the receiving point is specified by the area code or the postal code of the telephone number, and Pc is compared with the predicted reception level for each area prepared in advance, so that the antenna azimuth without detecting (Pc-Pu). -It is possible to determine whether the elevation angle needs to be adjusted.

FIG. 8 shows a front view of a satellite broadcast receiver according to an eighth embodiment of the present invention.
It is a block diagram which shows the function of an end part conceptually. In the figure, reference numeral 25 denotes P detected by the received power identification unit 5.
Based on c, Pu and Pn, (Pu−Pn) is detected,
The polarization plane angle detectors e and 26 that detect (Pc-Pu) estimate an appropriate received power that is expected to be RU at a receiving point based on information that specifies an area such as an area code or a postal code of a telephone number. It is an area reference table to do.

The outline of the operation in the normal reception state using the satellite broadcast receiver according to the eighth embodiment of the present invention shown in FIG. 8 will be described with reference to FIG. The description is omitted because it is the same.

FIG. 16 is a diagram showing an example of a procedure for detecting a polarization plane angle shift in the satellite broadcast receiver according to the seventh embodiment of the present invention. As in FIG. 15, also in FIG. 16, (Pc−Pu) indicates the D / U for the reception carrier.
It is assumed that the C / N ratio at the time of normal reception using a commercially available parabolic antenna is about 12 dB. Also, (Pu-Pn) represents the reception power ratio between the adjacent carrier position and the non-carrier position, and has a power ratio of about 3 dB in the normal reception state.

FIG. 24 is a block diagram showing the internal configuration of the polarization plane angle detector h25, which is a component of FIG. FIG.
In 4, the state determination 41 determines the deviation state of the polarization plane angle based on the polarization plane angle deviation data input from the D / U ratio-polarization plane angle conversion table 17 and the Pu / Pn ratio-polarization plane angle conversion table. Part h.

In FIGS. 16 and 8, the center frequency of the received carrier is 12.508 GHz, the carriers on the same polarization plane are arranged at intervals of 30 MHz in a band of 27 MHz, the adjacent carrier frequency is 12.523 GHz, and the The frequency is 12.493 GHz.

The polarization plane angle detection unit h25 detects the polarization plane angle deviation using Pc, Pu and Pn detected by the received power identification unit 5. The operation when (Pu−Pn) is 3 dB or more is the same as in the seventh embodiment of the present invention.

Normally, the EIRP indicating the transmission output of the satellite is constant depending on the area of the receiving point, and the area to be received (for example,
It is high in the center of symmetry with respect to the whole of Japan, and becomes lower toward the periphery. The received power at the receiving point is determined by the EIRP, the receiving antenna diameter, the antenna performance (G / T ratio), the receiving performance of the receiver, and the like. However, there is almost no difference in the performance of generally available antennas and receivers. Since the recommended diameter of the antenna is determined depending on the area, if the area of the receiving point can be specified, the estimated received power can be almost estimated.

In the polarization plane angle detection unit h25, when the state determination unit h41 determines that (Pu−Pn) is 3 dB or less, that is, that there is no polarization plane angle shift, the telephone number of the telephone number input in advance is determined. The area of the receiving point is specified by the area code, the postal code, and the like, and by referring to the area reference table 26, the expected appropriate received power Pe at the specified receiving point is detected. Next, the expected received power Pe
And the power ratio (Pe−Pc) of the actual received power Pc is detected,
Detected (Pe−Pc) are almost equal, for example, 1.5
In the case of within dB and when Pc is larger than Pe, it is determined that the received power is appropriate and that the polarization plane angle adjustment is unnecessary, and it is notified that "the polarization plane angle adjustment is not necessary" and the polarization plane angle detection is performed. finish. If (Pe-Pc) takes a value of 1.5 dB or more, it is determined that the received power is not sufficiently ensured due to poor azimuth and elevation adjustment of the antenna, and "adjustment of the azimuth and elevation of the antenna is necessary". And ends the detection of the polarization plane angle shift.

As described above, in the eighth embodiment of the present invention, the means for detecting the polarization plane angle shift includes information on the antenna diameter input from the outside, the area code of the area where the receiver is installed, and the like. The ratio (Pe) of the estimated power Pe of the received carrier in a normal state to the received power Pc of the received carrier based on information that can specify the area, such as a postal code.
-Pc) and (Pc)
Only when e-Pc) is larger than the threshold, it is determined that the setting of the azimuth and elevation of the antenna needs to be readjusted, and when smaller than the threshold, there is no deviation of the polarization plane angle or within the allowable range. By working to determine that
Since the amount of polarization plane adjustment required when installing the antenna is reported concretely and with high accuracy, the antenna installer distinguishes between azimuth and elevation adjustment and polarization plane angle adjustment in the process of antenna attitude adjustment work. The polarization plane angle can be adjusted easily and accurately.

[0118]

Since the present invention is configured as described above, it has the following effects.

Based on the reception power level for the reception carrier input from the antenna and the bit rejection rate for the signal being received, the reception signal and the L attached to the antenna are determined.
Since the presence or absence of the NB polarization plane angle deviation can be detected, the accuracy of antenna attitude adjustment can be improved without requiring additional hardware.

Also, the reception power level for the reception carrier input from the antenna, the same polarization adjacent carrier which has the same polarization as the reception carrier and is arranged adjacently on the frequency axis, and By identifying the reception intensity at the adjacent carrier frequency positioned at the center on the frequency axis, it is possible to detect the presence or absence of the polarization plane angle shift between the reception carrier and the LNB attached to the antenna, thereby adding hardware. , The accuracy of the attitude adjustment of the antenna can be improved.

Further, based on the ratio between the received power of the received carrier and the received power at the adjacent carrier frequency, a conversion table for associating the degree (angle) of the polarization plane angle shift of the antenna estimated from the ratio is used. Since the angle shift amount can be estimated, it is easy to specifically identify the necessary adjustment amount of the polarization plane angle of the antenna.

Further, on one of the two types of polarization planes transmitted from the satellite, at least the frequency axis is located further outside the outermost carrier positioned at the end on the frequency axis. In the above, the reception intensity in a carrier-free region separated by a frequency corresponding to a half of the interval from the outermost carrier to the carrier on the same polarization plane located next to the outermost carrier is detected. However, by detecting the reception power at the adjacent carrier frequency and detecting the ratio between the two, it is possible to detect the presence or absence of the polarization plane angle deviation between the reception carrier and the antenna, without adding hardware. The presence or absence of the polarization plane angle shift of the antenna can be detected with high accuracy.

Further, a conversion table for associating the degree (angle) of the angle of polarization plane deviation of the antenna estimated from the detected ratio with the ratio between the detected received power at the adjacent carrier frequency and the received power in the non-carrier region is provided. It is possible to estimate the amount of deviation of the angle of polarization of the antenna by using the information, so that the amount of deviation of the angle of polarization of the antenna can be easily identified with high accuracy.

Also, Detecting the ratio of the received power in the adjacent carrier frequency and the received power in the non-carrier region, and determining the presence or absence of the polarization plane angle shift based on the magnitude of the detected ratio, and the detected ratio is smaller than the predetermined threshold. If large, the received carrier, the difference between the received intensity at the adjacent carrier frequency is detected, the detected ratio,
A conversion table that associates the degree (angle) of the polarization plane angle shift of the antenna estimated from the detected difference,
Since a means for estimating the amount of deviation of the polarization plane angle of the antenna can be provided, the polarization plane of the antenna can be adjusted with high accuracy.

Further, the ratio between the received power in the adjacent carrier frequency and the received power in the non-carrier region is detected. If the detected ratio is smaller than a predetermined threshold, the received carrier and the adjacent carrier frequency are detected. The ratio of the reception intensities is detected, and it is determined from the magnitude of the detected ratio that the polarization plane angle deviation is less than the allowable range or the reception level is insufficient and that the antenna azimuth angle and elevation angle adjustment are necessary. Therefore, the angle of polarization of the antenna can be adjusted with high accuracy without being affected by the magnitude of the received power.

Also, the information of the antenna diameter input from the outside and the information which can specify the area, such as the area code and the postal code of the area where the receiver is installed, can be used to determine the reception carrier in a normal state. By estimating the expected reception strength and detecting the ratio between the estimated value and the reception power of the reception carrier, it is possible to determine whether or not the azimuth and elevation of the antenna need to be adjusted. The angle of polarization of the antenna can be easily adjusted under the following conditions.

[Brief description of the drawings]

FIG. 1 is a diagram showing a front end unit of a satellite broadcast receiver according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a front end unit of a satellite broadcast receiver according to a second embodiment of the present invention.

FIG. 3 is a diagram illustrating a front end unit of a satellite broadcast receiver according to a third embodiment of the present invention.

FIG. 4 is a diagram showing a front end unit of a satellite broadcast receiver according to a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a front end unit of a satellite broadcast receiver according to a fifth embodiment of the present invention.

FIG. 6 is a diagram showing a front end unit of a satellite broadcast receiver according to Embodiment 6 of the present invention.

FIG. 7 is a diagram showing a front end unit of a satellite broadcast receiver according to a seventh embodiment of the present invention.

FIG. 8 is a diagram showing a front end unit of a satellite broadcast receiver according to Embodiment 8 of the present invention.

FIG. 9 is a diagram showing an example of a procedure for detecting a polarization plane angle shift according to the first embodiment of the present invention.

FIG. 10 is a diagram showing an example of a procedure for detecting a polarization plane angle shift according to the second embodiment of the present invention.

FIG. 11 is a diagram showing an example of a procedure for detecting a polarization plane angle shift according to the third embodiment of the present invention.

FIG. 12 is a diagram showing an example of a procedure for detecting a polarization plane angle shift according to the fourth embodiment of the present invention.

FIG. 13 is a diagram showing an example of a procedure for detecting a polarization plane angle shift according to the fifth embodiment of the present invention.

FIG. 14 is a diagram showing an example of a procedure of detecting a polarization plane angle shift according to the sixth embodiment of the present invention.

FIG. 15 is a diagram showing an example of a procedure for detecting a polarization plane angle shift according to the seventh embodiment of the present invention.

FIG. 16 is a diagram showing an example of a procedure for detecting a polarization plane angle shift according to the eighth embodiment of the present invention.

FIG. 17 is a diagram illustrating a block configuration of a polarization plane angle detection unit a according to the first embodiment of the present invention.

FIG. 18 is a diagram illustrating a block configuration of a polarization plane angle detection unit b according to the second embodiment of the present invention.

FIG. 19 is a diagram showing a block configuration of a polarization plane angle detection unit c according to a third embodiment of the present invention.

FIG. 20 is a diagram illustrating a block configuration of a polarization plane angle detection unit d according to a fourth embodiment of the present invention.

FIG. 21 is a diagram illustrating a block configuration of a polarization plane angle detection unit e according to a fifth embodiment of the present invention.

FIG. 22 is a diagram illustrating a block configuration of a polarization plane angle detection unit f according to a sixth embodiment of the present invention.

FIG. 23 is a diagram illustrating a block configuration of a polarization plane angle detection unit g according to a seventh embodiment of the present invention.

FIG. 24 is a diagram showing a block configuration of a polarization plane angle detection unit h according to the eighth embodiment of the present invention.

FIG. 25 is a diagram showing a procedure for installing a parabolic antenna used in connection with a satellite broadcast receiver and adjusting the attitude of the antenna so that reception can be performed correctly.

FIG. 26 is a diagram illustrating a concept of a received signal level when there is a polarization plane angle shift.

FIG. 27 is a diagram illustrating the concept of the horizontal / vertical polarization system.

FIG. 28 is a diagram illustrating a change in signal power due to a polarization plane angle shift.

FIG. 29 is a diagram illustrating the influence of an interference signal on error-free performance.

FIG. 30 is a diagram illustrating a change in a D / U ratio due to a polarization plane shift.

FIG. 31 shows a front view of a conventional satellite broadcast receiver.
It is a block diagram showing an end part.

[Explanation of symbols]

1 antenna, 2 LNB, 3 tuner, 4 A /
D converter, 5 received power discriminator, 6 QPSK demodulator,
7 error correction section a, 8 error correction section b, 9 transport stream output section, 10 carrier control section, 11
Transport stream processing unit, 12 polarization plane angle detection unit a, 13 adjacent carrier control unit, 14 carrier selection unit a, 15 polarization plane angle detection unit b, 16 polarization plane angle detection unit c, 17 D / U ratio-polarization Wavefront angle conversion table, 18 non-carrier control section, 19 carrier selection section b, 20 polarization plane angle detection section d, 21 polarization plane angle detection section e, 22 Pu / Pn ratio-polarization plane angle conversion table,
23 polarization plane angle detection section f, 24 polarization plane angle detection section g, 25 polarization plane angle detection section h, 26 area reference table, 27 reception power determination section, 28 BER determination section, 29
State determination unit a, 30 carrier position received power storage unit, 3
1 Adjacent carrier position received power storage unit, 32 state determination unit b, 33 D / U ratio calculation unit, 34 state determination unit c, 35
Non-carrier position received power storage unit, 36 state determination unit d, 37 Pu / Pn ratio calculation unit, 38 state determination unit e,
39 state determination unit f, 40 state determination unit g, 41 state determination unit h.

Claims (16)

[Claims] 1. A satellite broadcast receiver used for satellite broadcasting for transmitting a plurality of carriers on two different types of polarization planes, wherein the receiver is tuned to a frequency of a specific reception carrier input to the receiver. Means for detecting the reception power of the reception carrier, means for detecting the demodulation bit error rate of digital data demodulated from the reception carrier, and discriminating the magnitude relationship of the detected reception power with respect to a predetermined reception power threshold. Means for determining the magnitude relationship of the demodulation bit error rate with respect to a predetermined threshold value of the demodulation bit error rate, and the magnitude relationship of the determined received power and the determined demodulation bit error rate. A satellite broadcast receiver comprising means for detecting the presence / absence of a polarization plane angle deviation of the antenna according to the magnitude relation. 2. A satellite broadcasting receiver used for satellite broadcasting for transmitting a plurality of carriers on two different kinds of polarization planes, wherein the receiver is tuned to a frequency of a specific receiving carrier inputted to the receiver. Means for detecting the reception power of the reception carrier, and an intermediate position on the frequency axis between the reception carrier and a carrier having the same polarization as the reception carrier and arranged adjacently on the frequency axis. Means for identifying the reception intensity at the adjacent carrier frequency, means for detecting the difference between the reception carrier and the reception power of the adjacent carrier frequency, and judging the magnitude relation of the detected difference with respect to a predetermined difference threshold. A satellite broadcast receiver comprising: means for detecting presence or absence of a polarization plane angle shift of the antenna based on the magnitude relation of the determined difference. 3. The satellite broadcast receiver according to claim 2, wherein said polarization plane angle deviation detecting means comprises: said detected difference; and an antenna polarization plane angle deviation estimated from said detected difference. A satellite broadcast receiver comprising: a conversion table for associating an amount; and means for estimating a deviation amount of a polarization plane angle of the antenna based on the detected difference and the conversion table. 4. A satellite broadcast receiver for use in satellite broadcasting for transmitting a plurality of carriers on two different types of polarization planes, wherein a frequency axis is set on one of the two types of polarization planes. The distance between the outermost carrier on the same polarization plane located on the frequency axis and at least the outermost carrier on the outermost side of the outermost carrier on the frequency axis, and Means for detecting reception strength in a carrier-free area separated by a frequency corresponding to an interval of / 2, a reception carrier, means for detecting reception strength in the adjacent carrier frequency, the carrier-free area and the adjacent carrier frequency 2. A satellite broadcast receiver comprising: means for detecting a difference in the above; 5. The satellite broadcast receiver according to claim 4, wherein said means for detecting said polarization plane angle deviation comprises: said detected difference; and an antenna polarization plane angle deviation amount estimated from said detected difference. And a means for estimating the amount of deviation of the angle of polarization of the antenna using the detected difference and the conversion table. 6. The satellite broadcast receiver according to claim 4, wherein said means for detecting said polarization plane angle shift includes means for determining the magnitude of said detected difference with respect to a predetermined difference threshold value. If the detected difference is larger than the predetermined difference threshold, it is determined that there is a polarization plane angle shift,
The receiving carrier, a means for detecting a reception intensity at the adjacent carrier frequency, a means for detecting a difference between the received carrier and the adjacent carrier frequency, the detected difference, and an antenna estimated from the detected difference. A satellite broadcast receiver, comprising: a conversion table for associating a polarization plane angle shift amount; and means for estimating a polarization plane angle shift amount of the antenna using the detected difference and the conversion table. 7. The satellite broadcast receiver according to claim 4, wherein said means for detecting said polarization plane angle shift comprises:
Means for detecting the reception intensity at the received carrier and the adjacent carrier frequency when the detected difference is smaller than the predetermined difference threshold, and detecting the difference between the received power at the received carrier and the adjacent carrier frequency. And a means for determining the magnitude of the detected difference with respect to a predetermined threshold, and when the detected difference is larger than the predetermined threshold, the polarization plane angle shift is about an allowable range. When it is determined that the reception level is less than the predetermined threshold, the reception level is insufficient, and the antenna azimuth angle
A satellite broadcast receiver comprising means for determining that elevation angle adjustment is necessary. 8. The satellite broadcast receiver according to claim 4, wherein said means for detecting the angle of polarization plane deviation determines a difference between the detected no-carrier area and the received power in an adjacent carrier frequency in advance. If less than the difference threshold,
Estimate the expected reception power of the receiving carrier in a normal state from information on the antenna diameter input from outside and information that can specify the area, such as the area code and postal code of the area where the receiver is installed. Means for detecting, the expected received power, means for detecting the expected difference between the received power of the receiving carrier,
Means for determining the magnitude of the detected expected difference with respect to a predetermined threshold of the expected difference, and only when the detected expected difference is larger than the threshold of the expected difference, the azimuth of the antenna And a means for determining that it is necessary to readjust the setting of the elevation angle, and determining that there is no deviation of the polarization plane angle or within an allowable range when the value is smaller than the threshold value of the expected difference. Satellite receiver. 9. A method for adjusting the angle of polarization of an antenna used in a satellite broadcast receiver, comprising the steps of tuning to a frequency of a specific reception carrier input to the receiver and detecting reception power of the reception carrier. Detecting a demodulated bit error rate of digital data demodulated from the received carrier; determining a magnitude relation of the detected received power with respect to a predetermined threshold of the received power; Determining a magnitude relationship of the demodulation bit error rate with respect to an error rate threshold; and determining a magnitude of the antenna based on the magnitude relationship of the determined received power and the magnitude of the determined demodulation bit error rate. An antenna polarization plane angle adjustment method characterized by detecting the presence or absence of a wavefront angle deviation. 10. A polarization angle adjusting means for an antenna used in a satellite broadcast receiver, wherein the frequency is tuned to a frequency of a specific reception carrier input to the receiver, and a reception power of the reception carrier is detected. And a reception intensity at an adjacent carrier frequency which is an intermediate position on the frequency axis between the reception carrier and a carrier having the same polarization as the reception carrier and arranged adjacently on the frequency axis. And a step of detecting a difference between the received power of the received carrier and the adjacent carrier frequency, and a step of determining a magnitude relation of the detected difference with respect to a predetermined threshold value of the difference. An antenna polarization plane angle adjustment method, wherein the presence or absence of a polarization plane angle deviation of the antenna is detected based on the magnitude relation of the difference. 11. The satellite broadcast receiver according to claim 10, wherein the step of detecting the polarization plane angle shift comprises: the detected difference and an antenna polarization plane angle shift estimated from the detected difference. An antenna polarization plane angle adjusting method, comprising: a conversion step of associating an amount with each other; and estimating a deviation amount of a polarization plane angle of the antenna from the detected difference and the conversion step. 12. A polarization plane angle adjusting method used for a satellite broadcast receiver, wherein an outermost end positioned at the end on the frequency axis on one of the two types of polarization planes. A frequency corresponding to a half of the interval from the outermost carrier to the carrier on the same polarization plane located next to the outermost carrier on the frequency axis at least on the outside of the carrier. Detecting the reception intensity in the non-carrier region, receiving carrier, detecting the reception intensity at the adjacent carrier frequency, and detecting the difference between the non-carrier region and the adjacent carrier frequency, An antenna polarization plane angle adjustment method, comprising detecting presence or absence of a polarization plane angle deviation between the reception carrier and the antenna based on the detected difference. 13. The polarization plane angle adjustment method according to claim 12, wherein the step of detecting the polarization plane angle deviation comprises: the detected difference; and an antenna polarization plane angle deviation estimated from the detected difference. An antenna polarization plane angle adjusting method, comprising: a conversion step of associating an amount with an antenna; and estimating a deviation amount of a polarization plane angle of the antenna by the detected difference and the conversion step. 14. The polarization plane angle adjusting method according to claim 12, wherein the step of detecting the polarization plane angle shift determines a magnitude of the detected difference with respect to a predetermined difference threshold value. A step of, when the detected difference is larger than the predetermined difference threshold, determining that there is a polarization plane angle shift, detecting the reception carrier, and a reception intensity at the adjacent carrier frequency; A step of detecting a difference between a received carrier and the adjacent carrier frequency, and a conversion step of associating the detected difference with a polarization plane angle shift amount of an antenna estimated from the detected difference; A method for adjusting an angle of polarization of an antenna, comprising estimating a deviation amount of an angle of polarization of the antenna by the conversion step. 15. The polarization plane angle adjusting method according to claim 12, wherein the step of detecting the polarization plane angle shift is performed when the detected difference is smaller than the predetermined difference threshold value. Detecting the reception intensity at the reception carrier and the adjacent carrier frequency; detecting the difference between the reception power at the reception carrier and the reception power at the adjacent carrier frequency; Having a step of determining the magnitude of the difference, when the detected difference is larger than the predetermined threshold, it is determined that the polarization plane angle deviation is less than or equal to an allowable range, and smaller than the predetermined threshold. In this case, it is determined that the reception level is insufficient and the antenna azimuth / elevation angle needs to be adjusted. 16. The polarization plane angle adjusting method according to claim 12, wherein in the step of detecting the polarization plane angle shift, the difference between the detected non-carrier area and the received power in the adjacent carrier frequency is determined in advance. When the difference is smaller than the threshold value of the difference, the information of the antenna diameter inputted from the outside and the information which can specify the area, such as the area code and the postal code of the area where the receiver is installed, are normal. Estimating the expected received power of the received carrier in the state; detecting the expected difference between the expected received power and the received power of the received carrier; and Determining the magnitude of the detected expected difference, and only when the detected expected difference is larger than the threshold value of the expected difference, it is necessary to readjust the azimuth and elevation settings of the antenna. Judge, An antenna polarization plane angle adjustment method characterized by determining that there is no deviation of the polarization plane angle or within a permissible range when the estimated difference is smaller than the threshold value.