CN1115504A

CN1115504A - Hygienic trace method

Info

Publication number: CN1115504A
Application number: CN 94108727
Authority: CN
Inventors: 陈义文
Original assignee: SHENGBAO CO Ltd
Current assignee: SHENGBAO CO Ltd
Priority date: 1994-07-18
Filing date: 1994-07-18
Publication date: 1996-01-24

Abstract

The satellite tracking method uses a satellite tracking device which uses full search mode to control movement of disk antenna up and down, left and right and quater dividing method to divide search range into 4 equal areas. If the signal intensity in one area is higher than a given value, the area is again divided into 4 equal areas for searching the strongest signal indicating satellite position. The signal is used as basis of calculation to regulate the direction of disk antenna for optimal receiving effect.

Description

Hygienic trace method

The present invention relates to a kind of hygienic trace technology.

Background of the present invention is mainly: satellite was to be fixed on the track in equator originally, when satellite service life for a long time, or apart from its life cycle in the time of only remaining two, three years, satellite is not to fix in orbit, but move in 8 font modes in orbit, and this 8 glyph shape can be different because of the region (with reference to shown in Figure 1), and because of its satellite of difference of time can be at 8 font difference places, because this situation makes ground disk antenna will follow satellite simultaneously and does 8 fonts and move and could aim at the satellite that drifts about, can obtain the picture of complete display.

The automatic trace mode of traditional satellite all utilizes the AGC voltage swing of tuner (Tuner) to determine whether that satellite exists and the size of decision satellite carrier signal, at first tuner is configured to the channel of demodulation certain value frequency earlier, the signal strength signal intensity of this channel is promptly represented in the AGC voltage of tuner output then, and decide the Aligning degree of disk antenna and satellite by this, but because each channel signals size is indefinite, incorrect because of tuner channel setting control more even, so disk antenna also has the situation of misalignment satellite, and disk antenna is to satelloid sometimes, but the tuner setting contents of channel is incorrect or this channel when not having program at present, output shows that the shortcoming of this kind mode can be comprehensively as follows not to arriving satellite:

Though 1, disk antenna when the frequency, demodulation frequency of tuner is set in the channel that does not have program, can be regarded as not having satellite to exist satelloid.

Though 2 same satellites, but the signal magnitude of each channel is often different, so get the foundation of a certain channel as hygienic trace registration signal size, is very one sided.

3, the good with bad of signal just represented in the output of the AGC voltage of tuner mostly, and between good and bad a major part difference in 6dB, if under good signal signal strength signal intensity for-35dB signal strength signal intensity not be-during 50dB, the output of the AGC voltage of tuner by signal strength signal intensity-35dB～-44dB is all identical, so can't be used as the best Aligning degree of disk antenna and satellite by this.

4, since tuner in satellite receiver (RECEIVER), and the AGC changing condition difference of each employed tuner of tame manufacturer, and under different satellites and the different weather environment, the AGC of tuner changes also different; If directly the size of AGC signal is decided the hygienic trace mode by the user, with causing the very big puzzlement of user, when satellite-signal changes, the neither size that can adjust the AGC signal of most of user, must be by the professional, for consumers, consuming time expensive again.

The objective of the invention is to propose a kind of hygienic trace method, make the process of satellite tracking that good accuracy, objectivity and automaticity be arranged, and the beholder can not felt the inconvenience of satellite drift is arranged at above-mentioned shortcoming.

The main contents of hygienic trace method of the present invention are: utilize full way of search, the control disk antenna reaches move left and right up and down, and adopt 4 point-scores that the hunting zone is divided into 4 equal portions, the signal strength signal intensity of detecting every bit, when the signal strength signal intensity of certain point during greater than certain definite value, again the peak signal place is divided into 4 equal portions with 4 point-scores and looks for peak signal, to the last a point represents to have satellite to exist herein; Utilize signal strength signal intensity that the intensitometer in the follow-up mechanism records as basis again, make follow-up mechanism according to the rotation number of degrees of the horizontal motor of input data adjustment with vertical motor.

To understand in order having further, now to be described as follows in detail in conjunction with following accompanying drawing to method of the present invention:

Description of drawings:

Fig. 1 is the drift condition diagram of satellite;

Fig. 2 is the schematic diagram of hygienic trace mode;

Fig. 3 is hygienic trace mode of the present invention (searching for Full search entirely) figure;

Fig. 4 is quick search (Fast search) figure;

Fig. 5 is a system block diagrams of the present invention;

Fig. 6 is the satellite signal spectrum figure of embodiment.

Technique scheme is as follows:

One, design concept:

Hygienic trace method of the present invention is that to adopt follow-up mechanism be locator, is the signal that directly utilizes frequency demultiplier (LNB), by the size of this signal as the foundation of following the trail of.

Two, design:

Present satellite television programming, can divide C-band and Ku-band two frequency bands substantially, the transmission band of satellite is 3.7GHz～4.2GHz during C-band, and the Ku-band transmission band is 10.9GHz～12.75GHz, no matter be that C-band or the signal of Ku-badn then are 950MHz～2050MHz after via LNB, have 6 channels in 950MHz～2050MHz as Fig. 2, these 6 channel signals are handled via wave detector after via the two-stage low noise amplifier again, wave detector can take out signal (channel 5) the strongest in these six channels and its signal strength signal intensity was converted into a magnitude of voltage this moment, because the variation of some interchanges is still arranged in this magnitude of voltage, so, again voltage is exported to CPU as signal strength signal intensity benchmark (with reference to shown in Figure 2) relatively again via the filtering and the amplifying circuit of back.

Three, fixture system behaviour in service

(1) (Set-up) is set: the idea of utilizing full search (full Search), be illustrated in figure 3 as the hygienic trace locator, the control disk antenna moves up and down and move left and right, and the signal strength signal intensity of detecting every bit, when certain any signal during greater than a certain default value, expression has satellite to exist herein, thus quite simple and easy when setting (Set-up), and need not be by other expensive instrument and equipment.

(2) in the use: when the user uses, its hygienic trace mode is at set intervals the time, can be thereon, down, left and right each skew a bit, look for the strongest point of signal strength signal intensity, and disk antenna moved to the strength of signal, all follow the trail of later in this identical mode, because locator moves voluntarily in the tracing process, and the side-play amount of each disk antenna is little, so the user is when watching program, do not have the in-and-out sensation of signal, and what watched all is optimum state.

When (3) changing satellite and watch, locator can be when (Set-up) be set the position of this satellite, mobile disk antenna is located to this, and in the certain limit at this place, find out the strongest point of signal, and be parked in this place, the searching mode is emphasized quick search (Fast search), so utilize 4 point-scores, at first this scope is divided into 4 equal portions, the signal of finding out a certain equal portions is the strongest, and again that this signal is the strongest equal portions are divided into 4 equal portions, again comparison signal intensity, then repeat same action, until last point (with reference to shown in Figure 4).

Hygienic trace mode of the present invention, as described below:

One, utilize the idea of search entirely, search (full Search, Fast Search) fast that hygienic trace positioner control disk antenna is moved up and down and move left and right, and the signal strength signal intensity of detecting every bit, to signal maximum point place and be set at the satellite signals of tracking.

Two, the present invention predicts the signal that satellite is launched by signal strength meter, and obtains the strongest signal, inputs to the foundation of CPU as the disk antenna move angle.

Figure 5 shows that hygienic trace apparatus and method of the present invention:

Be equiped with a frequency demultiplier 3 and an optically coupled device 4 on the disk antenna 2, optically coupled device 4 can be because of level, the action of vertical motor and send horizontal pulse signal 41 and give CPU 54 analytical calculations with vertical pulse 42, and establish the signal strength meter 51 that a cable connects disk antenna 2 and hygienic trace device 5, survey its signal strength signal intensity by signal strength meter 51, again through comparator 53, make comparisons through the value of digital to analog converter 55 conversions with a signal of CPU 54 inner outputs, the result transports to CPU 54, CPU 54 collection external datas are calculated the horizontal displacement output valve again and the vertical displacement output valve is delivered to

driver

56,57, distinguish the rotation number of degrees of controlling level motor 6 and the rotation number of degrees of vertical motor 7, make the position of 2 pairs of satelloids 1 of disk antenna.

When (Set-up) is set, can set the left and right limit of horizontal direction earlier, and the upper and lower limit of vertical direction, mat work horizontal pulse signal 41 and vertical pulse signal 42, CPU promptly knows the position of vertical and horizontal as calculated, and the anglec of rotation of level, vertical 6,7 pairs of disk antennas of motor is adjusted.

Figure 6 shows that the spectrogram of hygienic trace signal, expression satellite 1 antenna is launched six channels altogether among the figure, get the Mid Frequency (signal of 950MHz～2050MHz) through frequency demultiplier (LNB) 3 frequency reducings, each channel is except that the frequency difference, its signal strength signal intensity is also different, the present invention is the strongest channel of registration signal, the 5th channel as shown in Figure 6, so signal strength meter 51 can be selected the 5th channel signals, give comparator 53 and the CPU 54 that arrives, therefore the Aligning degree that No. 5 channel signals size that receives determines disk antenna 2 and satellite 1 impels disk antenna 2 to move with satellite 1 moving direction.

Take a broad view of narration and the explanation of above-mentioned dependency structure, hygienic trace mode of the present invention possesses following several advantages as can be known:

1, the present invention is with full search and fast search (Full-Search) and (Fast Search) (4 point-score) comes satellite tracking, emphasizes in the tracing process fast, and can not lose satellite Existence.

2, utilize signal strength meter in locator, therefore satellite and disk antenna are provided Good objectivity and the practicality of Aligning degree.

Claims

1, a kind of hygienic trace method, be one full the search (Full Serach) mode, the control disk antenna reaches move left and right up and down, and adopting 4 point-scores that the hunting zone is divided into 4 equal portions, the signal strength signal intensity of detecting every bit is when the signal of certain point during greater than certain definite value, again with the peak signal place, divide 4 equal portions to look for peak signal again with 4 point-scores, to the last a point represents to have satellite to exist herein.

2, hygienic trace method as claimed in claim 1 wherein utilizes signal strength meter to record signal strength signal intensity and gives follow-up mechanism as basis, makes tracker according to the rotation number of degrees of the horizontal motor of input data adjustment with vertical motor.