CN106101665B - Satellite signal processor - Google Patents
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- CN106101665B CN106101665B CN201610638698.9A CN201610638698A CN106101665B CN 106101665 B CN106101665 B CN 106101665B CN 201610638698 A CN201610638698 A CN 201610638698A CN 106101665 B CN106101665 B CN 106101665B
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- 238000001914 filtration Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 18
- 238000000034 method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000035945 sensitivity Effects 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 230000002452 interceptive effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
Abstract
The invention provides a satellite signal processor, which solves the problem that the existing satellite set-top box needs to transmit broadcast satellite television signals and positioning signals to the satellite set-top box through different data lines, thereby increasing the installation complexity and the installation cost, and comprises the following steps: the tuner receives the broadcast satellite television signal and performs mixing amplification processing on the broadcast satellite television signal; the active antenna unit is used for receiving a Global Navigation Satellite System (GNSS) positioning signal and amplifying the GNSS positioning signal; the intermediate frequency signal processing unit is used for attenuating the broadband noise level in the satellite television intermediate frequency signal output by the tuner, and the difference value between the power of the broadband noise level of the attenuated satellite television intermediate frequency signal and the power of the GNSS positioning signal output by the active antenna unit is smaller than a preset threshold value; and the first combiner combines the amplified GNSS positioning signal and the attenuated satellite television intermediate frequency signal and transmits the combined signal to the satellite set-top box.
Description
Technical Field
The invention relates to the technical field of satellite signal processing, in particular to a satellite signal processor.
Background
The broadcast and television central office takes advantage of the large coverage area and low coverage cost of satellites, and hopes that direct broadcast satellites can cover areas which cannot be reached by the direct broadcast satellites as supplements and extensions of cable and terrestrial digital televisions. The TV signals are transmitted to thousands of households, so that the region which cannot be reached by the cable TV can watch about 58 sets of TV programs for free.
In order to prevent illegal personnel or organizations from installing the live satellite set-top box in a region reached by a cable television, confusion and unnecessary economic loss on the management of the cable television and the live satellite television are caused. Meanwhile, for the healthy development of a television management system, the broadcasting and television central office is always developing and updating an anti-cracking live broadcast star management system. The live broadcast satellite management system comprises a broadcast live broadcast satellite management center, a set top box, a local management center and the like.
In the development and updating of the set-top box, the prior art discloses a method for realizing an anti-tamper function by using Global Positioning System (GPS) Positioning.
In the method for realizing the anti-cracking function by positioning the GPS system, a GPS module and a tuner (Low Noise Block, LNB) are arranged together to form a whole, the GPS is supplied with power through a feeder line of the LNB, longitude and latitude signals output by the GPS are transmitted to a set-top box main application software module through another data line, meanwhile, the main application software module reads information of a local installation position, a longitude and latitude range and the like stored in a security memory card (intelligent card), judges whether the set-top box is arranged in a legal area or not through comparison, if the main application module outputs a signal for unlocking a program stream in the legal area, if the main application module outputs a signal for unlocking the program stream in the illegal area. However, this method requires one more data line to be installed, thereby increasing installation complexity and installation cost.
Disclosure of Invention
The invention aims to provide a satellite signal processor, which is used for solving the problems that in the existing satellite set-top box anti-cracking technology, broadcast satellite television signals and positioning signals need to be transmitted to a satellite set-top box through different data lines, and further the installation complexity and the installation cost are increased.
In order to achieve the above object, the present invention provides a satellite signal processor comprising:
the tuner is used for receiving broadcast satellite television signals, performing mixing amplification processing on the broadcast satellite television signals and outputting satellite television intermediate frequency signals;
the active antenna unit is used for receiving a Global Navigation Satellite System (GNSS) positioning signal, amplifying the GNSS positioning signal and outputting the amplified GNSS positioning signal;
the intermediate frequency signal processing unit is connected with the tuner and is used for attenuating the broadband noise level in the satellite television intermediate frequency signal output by the tuner and outputting the attenuated satellite television intermediate frequency signal, wherein the difference value between the power of the broadband noise level of the attenuated satellite television intermediate frequency signal and the power of the GNSS positioning signal output by the active antenna unit is smaller than a preset threshold value;
and the first combiner is respectively connected with the intermediate frequency signal processing unit and the active antenna unit and is used for combining the amplified GNSS positioning signal and the attenuated satellite television intermediate frequency signal and transmitting the signal after the combination processing to a satellite set top box.
Wherein, the tuner comprises:
a receiving unit for receiving a broadcast satellite television signal;
the low-noise amplifier unit is connected with the receiving unit and is used for amplifying the broadcast satellite television signals;
and the phase-locked loop and the gain amplifier are connected with the low-noise amplifier unit and are used for carrying out frequency mixing amplification processing on the amplified broadcast satellite television signals to obtain the satellite television intermediate frequency signals.
Wherein the receiving unit includes:
a wave collector for collecting the broadcast satellite television signals reflected from the feed source;
the waveguide tube is connected with the wave collector, and a left-handed probe and a right-handed probe are arranged in the waveguide tube;
the waveguide tube transmits the broadcast satellite television signals collected by the wave collector to the low-noise amplifier unit through the left-handed probe and the right-handed probe.
Wherein the low noise amplifier unit includes:
the left-handed channel low-noise amplifier is connected with the left-handed probe and is used for performing primary amplification processing on the broadcast satellite television signals received by the left-handed probe;
the right-handed channel low-noise amplifier is connected with the right-handed probe and is used for performing primary amplification processing on the broadcast satellite television signals received by the right-handed probe;
the second combiner is respectively connected with the left-handed channel low noise amplifier and the right-handed channel low noise amplifier and is used for combining the broadcast satellite television signals transmitted by the left-handed probe and the broadcast satellite television signals transmitted by the right-handed probe;
and the first low-noise amplifier is connected with the second combiner and is used for carrying out secondary amplification processing on the broadcasting satellite television signals after the combining processing.
Wherein the satellite signal processor further comprises: the low-noise amplifier unit, the phase-locked loop and the gain amplifier are all fixed on the surface of the printed circuit board; and
the satellite signal processor further includes:
the upper cover plate covers the surface of the printed circuit board, and cavity structures are respectively arranged at the positions of the upper cover plate, which correspond to the low-noise amplifier unit, the phase-locked loop and the gain amplifier and the output ends of the phase-locked loop and the gain amplifier.
The upper cover plate is fixedly connected with the printed circuit board through screws.
Wherein the satellite signal processor further comprises:
and the joint structure is arranged on the surface of the printed circuit board and is respectively connected with the output end of the first combiner and the satellite set top box, and the joint structure is used for transmitting the signals subjected to the combining processing of the first combiner to the satellite set top box.
Wherein, the intermediate frequency signal processing unit includes:
a first low-pass filter matching circuit connected to the tuner;
a low pass filter connected to the first low pass filter matching circuit;
and a second low-pass filter matching circuit connected to the low-pass filter and the first combiner.
Wherein the active antenna unit includes:
the ceramic antenna is used for receiving GNSS positioning signals issued by navigation satellites;
the second low-noise amplifier is connected with the ceramic antenna and used for amplifying the GNSS positioning signal;
the acoustic surface filter is connected with the second low-noise amplifier and is used for filtering the amplified GNSS positioning signal to obtain the GNSS positioning signal within a preset frequency range;
and the gain amplifier is connected with the acoustic meter filter and used for amplifying the GNSS positioning signal within the preset frequency band range and outputting the amplified GNSS positioning signal within the preset frequency band range.
The embodiment of the invention has the following beneficial effects:
in the satellite signal processor of the embodiment of the invention, the intermediate frequency signal processing unit attenuates the broadband noise level in the satellite television intermediate frequency signal output by the tuner and outputs the attenuated satellite television intermediate frequency signal; the first combiner combines the GNSS positioning signal amplified by the active antenna unit and the attenuated satellite television intermediate frequency signal, and transmits the combined signal to the satellite set-top box, and because the difference value between the power of the broadband noise level of the attenuated satellite television intermediate frequency signal and the power of the GNSS positioning signal output by the active antenna unit is smaller than a preset threshold value, the influence of the broadband noise level on the GNSS positioning signal is reduced, the satellite set-top box can demodulate a television program stream and the GNSS positioning signal from the combined signal, a data line is not required to be added, and the installation complexity and the installation cost are reduced.
Drawings
Fig. 1 is a block diagram of a satellite signal processor according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a satellite signal processor according to an embodiment of the invention;
FIG. 3 is a block diagram of a satellite signal processor according to an embodiment of the invention;
FIG. 4 is a schematic diagram of another exemplary satellite signal processor;
FIG. 5 is a schematic structural diagram of an upper cover plate according to an embodiment of the present invention;
FIG. 6 is a schematic view of another structure of the upper cover plate according to the embodiment of the present invention;
fig. 7 is a block diagram of an intermediate frequency signal processing unit according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a connection between a satellite signal processor and a set-top box according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings.
The embodiment of the invention provides a satellite signal processor, which solves the problems that in the existing satellite set-top box anti-cracking technology, broadcast satellite television signals and positioning signals need to be transmitted to a satellite set-top box through different data lines, and further the installation complexity and the installation cost are increased.
As shown in fig. 1, a satellite signal processor according to an embodiment of the present invention includes:
the tuner 1 is used for receiving broadcast satellite television signals, performing mixing amplification processing on the broadcast satellite television signals and outputting satellite television intermediate frequency signals.
The tuner LNB is a conventional integrated down converter. The LNB functions to receive broadcast satellite television signals of a broadcast television satellite and output satellite television intermediate frequency signals, and may specifically include a low noise amplifier, a combiner, a local oscillator, a mixer, a mid-amplifier, and other circuits. In order to meet the use requirement of the system, the gain of the LNB in the embodiment of the invention is not lower than 62 dB.
And the active antenna unit 2 is used for receiving a global navigation satellite system GNSS positioning signal, amplifying the GNSS positioning signal and outputting the amplified GNSS positioning signal.
Here, the active antenna specifically receives signals in the BD2, GPS L1, and GLONASS bands and outputs amplified signals in the BD2, GPS L1, and GLONASS bands, and may specifically include circuits such as a low noise amplifier, a sound table filter, and an intermediate amplifier.
And the intermediate frequency signal processing unit 3 is connected with the tuner 1 and is used for attenuating the broadband noise level in the satellite television intermediate frequency signal output by the tuner and outputting the attenuated satellite television intermediate frequency signal, wherein the difference value between the power of the broadband noise level of the attenuated satellite television intermediate frequency signal and the power of the GNSS positioning signal output by the active antenna unit is smaller than a preset threshold value.
It should be noted that, when the LNB normally works, the frequency range of the output broadband noise level covers the GNSS working frequency band, and the output power of the broadband noise level is more than 35dB greater than the power of the GNSS useful signal output by the GNSS active antenna, because the anti-interference capability of the GNSS module in the satellite receiving set-top box does not reach the technical level of the broadband noise signal greater than 30dB, when the LNB signal and the GNSS signal come from one feeder line to the satellite set-top box at the same time, the GNSS module cannot resolve the GNSS information because of the interference of the broadband noise level of the LNB. Here, the preset threshold may be 30dB specifically.
In a specific embodiment of the present invention, the intermediate frequency signal processing unit 3 may specifically be composed of a low pass filter and a peripheral matching circuit, and the intermediate frequency signal processing unit performs attenuation processing on a broadband noise level output by the LNB, so that when the satellite set-top box can demodulate and play a television program, a noise level power value output by the LNB in a GNSS operating frequency band is reduced as much as possible, so that the influence of the noise level output by the LNB on the resolution of GNSS information by a GNSS module of the satellite set-top box is reduced, and thus the requirement of the positionable broadcast satellite television set-top box on GNSS signals is met.
And the first combiner 4 is respectively connected with the intermediate frequency signal processing unit 3 and the active antenna unit 2, and is used for combining the amplified GNSS positioning signal and the attenuated satellite television intermediate frequency signal and transmitting the signal after the combination processing to a satellite set top box.
Specifically, the first combiner 4 transmits the signals after combining processing to the satellite set top box through one feeder line, and a data line does not need to be added, so that the installation cost is saved.
The satellite television set-top box is a set-top box with the GNSS signal resolving capability, and can specifically comprise a satellite broadcast television signal receiving and demodulating processing module, a GNSS module, a safe storage unit and a main application software module.
The receiving demodulation processing module demodulates the satellite broadcast signals, and then processes the demodulated signals to form television information required by a display; the GNSS module processes and calculates the received GNSS signal to output the latitude and longitude value of the position of the current antenna; the safety storage unit stores information such as longitude and latitude ranges of positions where the local computer is to be installed, serial numbers of chips of the local computer, serial numbers of the local computer and the like; the main application software module reads the latitude and longitude values of the position of the output antenna of the GNSS module, compares the latitude and longitude values with the latitude and longitude range value of the position, where the local computer is to be installed, in the safety storage unit, and if the latitude and longitude values of the position of the output antenna of the GNSS module are within the latitude and longitude range value of the position, where the local computer is to be installed, in the safety storage unit, the main application software module outputs an unlocking program stream signal, otherwise, the main application software module does not output the signal for unlocking the program stream.
In the satellite signal processor of the embodiment of the invention, the intermediate frequency signal processing unit attenuates the broadband noise level in the satellite television intermediate frequency signal output by the tuner and outputs the attenuated satellite television intermediate frequency signal; the first combiner combines the GNSS positioning signal amplified by the active antenna unit and the attenuated satellite television intermediate frequency signal, and transmits the combined signal to the satellite set-top box, and because the difference value between the power of the broadband noise level of the attenuated satellite television intermediate frequency signal and the power of the GNSS positioning signal output by the active antenna unit is smaller than a preset threshold value, the influence of the broadband noise level on the GNSS positioning signal is reduced, the satellite set-top box can demodulate a television program stream and the GNSS positioning signal from the combined signal, a data line is not required to be added, and the installation complexity and the installation cost are reduced.
Further, the tuner 1 includes:
a receiving unit for receiving a broadcast satellite television signal.
As shown in fig. 2, 3 and 4, the receiving unit includes: a wave collector 11 for collecting the broadcast satellite television signal reflected from the feed; the waveguide tube 12 is connected with the wave collector 11, and a left-handed probe 13 and a right-handed probe 14 are arranged in the waveguide tube 12; wherein, the waveguide 12 transmits the broadcast satellite television signal collected by the wave collector 11 to the low noise amplifier unit through the left-handed probe 13 and the right-handed probe 14.
And the low-noise amplifier unit is connected with the receiving unit and is used for amplifying the broadcast satellite television signals.
Here, the low noise amplifier unit may specifically include:
and the left-handed channel low-noise amplifier 15 is connected with the left-handed probe 13 and is used for performing primary amplification processing on the broadcast satellite television signal received by the left-handed probe 13. The left-hand channel low noise amplifier 15 is soldered to a printed circuit board.
And the right-handed channel low noise amplifier 16 is connected with the right-handed probe 14 and is used for performing primary amplification processing on the broadcast satellite television signal received by the right-handed probe 14. The right-hand channel lna 16 is soldered to the printed circuit board. The left-handed probe 13 and the right-handed probe 14 receive the broadcast satellite television signals and then transmit the broadcast satellite television signals to the low noise amplifier of the corresponding channel through the 50 Ω microstrip line on the printed circuit board, and the broadcast satellite television signals are amplified through the left-handed channel low noise amplifier 15 and the right-handed channel low noise amplifier 16, so that the receiving sensitivity of the LNB can be effectively improved.
And a second combiner 17 connected to the left-handed low noise amplifier 15 and the right-handed low noise amplifier 16, respectively, and configured to combine the broadcast satellite television signal transmitted by the left-handed probe 13 and the broadcast satellite television signal transmitted by the right-handed probe 14. Specifically, the second combiner 17 is a KU-band two-in-one combiner, and is realized by designing the length, the width and the shape of a microstrip line of a printed circuit board, and mainly combines two paths of signals output by a left-handed channel low noise amplifier and a right-handed channel low noise amplifier into one path of signal and outputs the combined signal to a next-stage amplifier.
And the first low noise amplifier 18 connected to the second combiner 17 is configured to perform secondary amplification processing on the broadcast satellite television signal after the combining processing. The signal output by the second combiner 17 is again amplified here to again improve the reception sensitivity of the LNB.
And the phase-locked loop and gain amplifier 19 is connected with the first low-noise amplifier 18 and is used for performing frequency mixing amplification processing on the amplified broadcast satellite television signal to obtain the satellite television intermediate-frequency signal.
Here, the pll and the gain amplifier 19 are specifically LNB chips soldered on a printed circuit board, and include therein a local oscillator signal of 10.75GHz, a mixer, an L-band amplifier, a power supply comparison circuit, a front-end amplifier power supply processing circuit, and the like.
Further, the tuner further includes:
and the first power supply conversion circuit 20 is specifically used for converting the power supply voltage into a direct current voltage of 6V, so that the LNB can work normally.
Further, the satellite signal processor further includes: the low-noise amplifier unit, the phase-locked loop and the gain amplifier 19 are all fixed on the surface of the printed circuit board; and
the satellite signal processor further includes:
and the upper cover plate 5 covers the surface of the printed circuit board, and cavity structures are respectively arranged at the positions of the upper cover plate 5, which correspond to the low-noise amplifier unit, the phase-locked loop and the gain amplifier and the output ends of the phase-locked loop and the gain amplifier.
In the specific embodiment of the invention, all electronic components are fixed on the printed circuit board, the printed circuit board is positioned between the waveguide cavity and the upper cover plate, and the printed circuit board, the waveguide cavity and the upper cover plate are tightly connected through the tapping screws 7, so that the phenomenon of signal interference on the GNSS active antenna due to signal leakage can be effectively prevented.
In the embodiment of the present invention, as shown in fig. 5 and 6, the upper cover plate 5 has a wall thickness of 1 mm, and is divided into four cavities, and the first cavity structure 51 is used for preventing the left-handed channel lna and the right-handed channel lna from interfering with other rf circuits. The second cavity structure 52 prevents the first lna from interfering with other rf circuits. The third cavity structure 53 prevents the pll and the gain amplifier from interfering with other rf circuits, and the fourth cavity structure 54 prevents the pll and the gain amplifier from interfering with other rf circuits.
The upper cover plate 5 can be waterproof, and the cavity structure of the upper cover plate 5 can prevent signal interference among the radio frequency units, interference of LNB output signals to the active antenna and interference of product output signals to the active antenna.
Further, as shown in fig. 3, the satellite signal processor according to the embodiment of the present invention further includes:
and the joint structure 6 is arranged on the surface of the printed circuit board and is respectively connected with the output end of the first combiner 4 and the satellite set-top box, and the joint structure 6 is used for transmitting the signals subjected to the combining processing by the first combiner 4 to the satellite set-top box.
The connector structure is specifically an F connector of a signal output end and a power supply voltage input end, the F connector is screwed with the printed circuit board, and meanwhile, a central connecting line of the F connector is welded on the printed circuit board to play a role in signal output and power supply voltage input. The first combiner combines the signal output by the active antenna unit and the signal output by the intermediate frequency signal processing unit and outputs the combined signal from the public port, and the output signal passes through the F connector and then is supplied to the satellite set top box through the feeder line. The first combiner is welded on the printed circuit board.
Further, in the satellite signal processor according to the embodiment of the present invention, as shown in fig. 7, the intermediate frequency signal processing unit 3 includes:
and a first low-pass filter matching circuit 31 connected to the tuner 1.
And a low-pass filter 32 connected to the first low-pass filter matching circuit 31.
And a second low-pass filter matching circuit 33 connected to the low-pass filter 32 and the first combiner 4.
The intermediate frequency signal processing unit 3 attenuates the broadband noise level in the satellite television intermediate frequency signal output by the tuner 1, and reduces the interference of the satellite television intermediate frequency signal output by the LNB to the GNSS signal as much as possible, so that the satellite set-top box can demodulate the television program stream and the GNSS positioning signal from the combined signal without increasing a data line, and further, the installation complexity and the installation cost are reduced.
Further, in the satellite signal processor according to the embodiment of the present invention, the active antenna unit 2 includes:
and the ceramic antenna 21 is used for receiving a GNSS positioning signal transmitted by a navigation satellite. The ceramic antenna is a GNSS passive ceramic antenna and is welded on the printed circuit board, and the GNSS passive ceramic antenna and the wave collector are respectively arranged at two ends of the printed circuit board.
And the second low-noise amplifier 22 is connected with the ceramic antenna 21 and is used for amplifying the GNSS positioning signal.
The second low noise amplifier 22 is soldered on the printed circuit board to amplify the signal output from the ceramic antenna 21, and since the signal received by the ceramic antenna 21 is weak, the receiving sensitivity of the active antenna unit can be effectively improved by the second low noise amplifier 22.
And the acoustic surface filter 23 is connected to the second low noise amplifier 22 and configured to perform filtering processing on the amplified GNSS positioning signal to obtain a GNSS positioning signal within a preset frequency range.
The acoustic surface filter 23 is welded on the printed circuit board, and mainly functions to filter out useful signals of a non-navigation frequency band received by the second low noise amplifier 22, improve the signal quality of signals output by the active antenna, and improve the signal processing effect of the GNSS module in the satellite set-top box.
And the gain amplifier 24 is connected with the acoustic meter filter 23 and is configured to amplify the GNSS positioning signal within the preset frequency band range and output the amplified GNSS positioning signal within the preset frequency band range.
The gain amplifier 24 is soldered on the printed circuit board, and amplifies the signal processed by the acoustic surface filter 23 again, so as to improve the output power of the active antenna unit, and further improve the signal processing effect of the GNSS module in the satellite set-top box.
Further, in the satellite signal processor according to the embodiment of the present invention, the active antenna unit 2 further includes:
and a second power conversion circuit 25, which is specifically configured to convert the supply voltage into a dc voltage of 5V, so that the active antenna unit operates normally.
The working principle of the satellite signal processor according to the embodiment of the present invention is specifically described below with reference to fig. 2.
Active antenna element theory of operation:
the GNSS positioning signal is received by the ceramic antenna 21, and since the signal level of the signal of the navigation satellite is weak when reaching the ground, the second low noise amplifier 22 is used at the rear end of the ceramic antenna 21 to improve the receiving sensitivity of the system. The GNSS positioning signal is output by the second low noise amplifier 22 and then enters the acoustic surface filter 23, the acoustic surface filter 23 processes the non-GNSS signal and then outputs the non-GNSS signal to the gain amplifier 24, and the gain amplifier 24 amplifies the GNSS signal again and then outputs the GNSS signal to the first combiner 4.
The working principle of the tuner is as follows:
the broadcast satellite signal is output through the left-hand probe 13 and the right-hand probe 14, and a low noise amplifier (divided into a left-hand channel low noise amplifier 15 and a right-hand channel low noise amplifier 16) is used at the output ends of the left-hand probe 13 and the right-hand probe 14 respectively to improve the receiving sensitivity of the LNB. The signal is sent to the second combiner 17 after passing through the left-handed channel low noise amplifier 15 and the right-handed channel low noise amplifier 16, the second combiner 17 outputs the signal and then sends the signal to the first low noise amplifier 18 for amplification, and then the signal is sent to the phase-locked loop and gain amplifier 19, the phase-locked loop and gain amplifier 19 firstly carries out frequency mixing processing, and the 11.7 GHz-12.2 GHZz signal sent to the phase-locked loop and gain amplifier is mixed into a 950 MHz-1450 MHz television intermediate frequency signal, and then the television intermediate frequency signal is amplified and output to the intermediate frequency signal processing unit 3. The gain of the signal before being input into the intermediate frequency signal processing unit can not be smaller than 62dB so as to meet the requirement that the satellite set-top box is used in different regions.
When the electronic component works, thermal noise and the like are generated by electronic movement to form a noise level, the noise level of the tuner LNB is superposed and amplified, and before the noise level enters the intermediate frequency signal processing unit 3, the noise level power of the 950 MHZ-2150 MHz frequency band output by the LNB is larger than-60 dBm. The output power of the active antenna unit for outputting the GNSS frequency band is very small, and is smaller than the noise level output by the LNB by more than 30dB, so that the GNSS module in the satellite set-top box can not solve the navigation signal. In the embodiment of the invention, the intermediate frequency signal processing unit 3 processes the useless television signal frequency band of the satellite set-top box in the LNB output signal through the low-pass filter and the peripheral circuit thereof, and the GNSS frequency band is also in the useless television signal frequency band, so that when the signal of the GNSS frequency band is inhibited by more than 35dB in the noise level output by the LNB, the requirement of the GNSS module of the satellite set-top box for resolving the signal can be completely met, and the processed satellite television intermediate frequency signal is output to the first combiner 4.
The intermediate frequency signal processing unit 3 processes the signal and outputs the processed signal to any one port of the non-public port of the first combiner 4, the GNSS positioning signal output by the gain amplifier enters the other port of the non-public port of the first combiner 4, the two signals are output from the public port of the first combiner at the same time, and the public port is connected with the joint structure 6.
As shown in fig. 8, the joint structure of the satellite signal processor outputs the GNSS positioning signal and the processed satellite television intermediate frequency signal to the satellite television set-top box having the positioning function through the feeder line. The satellite television set-top box can specifically comprise a satellite broadcast television signal receiving and demodulating processing module, a GNSS module, a safe storage unit and a main application software module.
The receiving demodulation processing module demodulates the satellite broadcast signals, and then processes the demodulated signals to form television information required by a display; the GNSS module processes and calculates the received GNSS signal to output the latitude and longitude value of the position of the current antenna; the safety storage unit stores information such as longitude and latitude ranges of positions where the local computer is to be installed, serial numbers of chips of the local computer, serial numbers of the local computer and the like; the main application software module reads the latitude and longitude values of the position of the output antenna of the GNSS module, compares the latitude and longitude values with the latitude and longitude range value of the position, where the local computer is to be installed, in the safety storage unit, and if the latitude and longitude values of the position of the output antenna of the GNSS module are within the latitude and longitude range value of the position, where the local computer is to be installed, in the safety storage unit, the main application software module outputs an unlocking program stream signal to the display, otherwise, the main application software module does not output the signal for unlocking the program stream.
In the satellite signal processor of the embodiment of the invention, the intermediate frequency signal processing unit attenuates the broadband noise level in the satellite television intermediate frequency signal output by the tuner and outputs the attenuated satellite television intermediate frequency signal; the first combiner combines the GNSS positioning signal amplified by the active antenna unit and the attenuated satellite television intermediate frequency signal, and transmits the combined signal to the satellite set-top box, and because the difference value between the power of the broadband noise level of the attenuated satellite television intermediate frequency signal and the power of the GNSS positioning signal output by the active antenna unit is smaller than a preset threshold value, the influence of the broadband noise level on the GNSS positioning signal is reduced, the satellite set-top box can demodulate a television program stream and the GNSS positioning signal from the combined signal, a data line is not required to be added, and the installation complexity and the installation cost are reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A satellite signal processor, comprising:
the tuner is used for receiving broadcast satellite television signals, performing mixing amplification processing on the broadcast satellite television signals and outputting satellite television intermediate frequency signals;
the active antenna unit is used for receiving a Global Navigation Satellite System (GNSS) positioning signal, amplifying the GNSS positioning signal and outputting the amplified GNSS positioning signal;
the intermediate frequency signal processing unit is connected with the tuner and is used for attenuating the broadband noise level in the satellite television intermediate frequency signal output by the tuner and outputting the attenuated satellite television intermediate frequency signal, wherein the difference value between the power of the broadband noise level of the attenuated satellite television intermediate frequency signal and the power of the GNSS positioning signal output by the active antenna unit is smaller than a preset threshold value;
and the first combiner is respectively connected with the intermediate frequency signal processing unit and the active antenna unit and is used for combining the amplified GNSS positioning signal and the attenuated satellite television intermediate frequency signal and transmitting the signal after the combination processing to a satellite set top box.
2. The satellite signal processor of claim 1, wherein the tuner comprises:
a receiving unit for receiving a broadcast satellite television signal;
the low-noise amplifier unit is connected with the receiving unit and is used for amplifying the broadcast satellite television signals;
and the phase-locked loop and the gain amplifier are connected with the low-noise amplifier unit and are used for carrying out frequency mixing amplification processing on the amplified broadcast satellite television signals to obtain the satellite television intermediate frequency signals.
3. The satellite signal processor of claim 2, wherein the receiving unit comprises:
a wave collector for collecting the broadcast satellite television signals reflected from the feed source;
the waveguide tube is connected with the wave collector, and a left-handed probe and a right-handed probe are arranged in the waveguide tube;
the waveguide tube transmits the broadcast satellite television signals collected by the wave collector to the low-noise amplifier unit through the left-handed probe and the right-handed probe.
4. The satellite signal processor of claim 3, wherein the low noise amplifier unit comprises:
the left-handed channel low-noise amplifier is connected with the left-handed probe and is used for performing primary amplification processing on the broadcast satellite television signals received by the left-handed probe;
the right-handed channel low-noise amplifier is connected with the right-handed probe and is used for performing primary amplification processing on the broadcast satellite television signals received by the right-handed probe;
the second combiner is respectively connected with the left-handed channel low noise amplifier and the right-handed channel low noise amplifier and is used for combining the broadcast satellite television signals transmitted by the left-handed probe and the broadcast satellite television signals transmitted by the right-handed probe;
and the first low-noise amplifier is connected with the second combiner and is used for carrying out secondary amplification processing on the broadcasting satellite television signals after the combining processing.
5. The satellite signal processor of claim 2, further comprising: the low-noise amplifier unit, the phase-locked loop and the gain amplifier are all fixed on the surface of the printed circuit board; and
the satellite signal processor further includes:
the upper cover plate covers the surface of the printed circuit board, and cavity structures are respectively arranged at the positions of the upper cover plate, which correspond to the low-noise amplifier unit, the phase-locked loop and the gain amplifier and the output ends of the phase-locked loop and the gain amplifier.
6. The satellite signal processor of claim 5, wherein the upper cover plate is fixedly connected to the printed circuit board by screws.
7. The satellite signal processor of claim 5, further comprising:
and the joint structure is arranged on the surface of the printed circuit board and is respectively connected with the output end of the first combiner and the satellite set top box, and the joint structure is used for transmitting the signals subjected to the combining processing of the first combiner to the satellite set top box.
8. The satellite signal processor of claim 1, wherein the intermediate frequency signal processing unit comprises:
a first low-pass filter matching circuit connected to the tuner;
a low pass filter connected to the first low pass filter matching circuit;
and a second low-pass filter matching circuit connected to the low-pass filter and the first combiner.
9. The satellite signal processor of claim 1, wherein the active antenna unit comprises:
the ceramic antenna is used for receiving GNSS positioning signals issued by navigation satellites;
the second low-noise amplifier is connected with the ceramic antenna and used for amplifying the GNSS positioning signal;
the acoustic surface filter is connected with the second low-noise amplifier and is used for filtering the amplified GNSS positioning signal to obtain the GNSS positioning signal within a preset frequency range;
and the gain amplifier is connected with the acoustic meter filter and used for amplifying the GNSS positioning signal within the preset frequency band range and outputting the amplified GNSS positioning signal within the preset frequency band range.
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| CN106997980A (en) * | 2017-05-10 | 2017-08-01 | 四川省视频电子有限责任公司 | For satellite TV signal and the anti-tampering combiner and its system of positioning signal |
| CN108417987B (en) * | 2018-02-01 | 2020-09-08 | 北京爱科迪通信技术股份有限公司 | Beacon threshold determination method for satellite antenna system |
| CN109561269A (en) * | 2018-12-04 | 2019-04-02 | 安徽站乾科技有限公司 | A kind of simplicity based on automatic identification tuner relevant parameter searches star device |
| CN109587473A (en) * | 2018-12-04 | 2019-04-05 | 安徽站乾科技有限公司 | A kind of self detection device of the failure of satellite TV system |
| CN109617562A (en) * | 2018-12-05 | 2019-04-12 | 安徽站乾科技有限公司 | A method of reducing filter power loss |
| CN109788259A (en) * | 2018-12-06 | 2019-05-21 | 安徽站乾科技有限公司 | A kind of tuner automatically switches the method and system of satellite television |
| CN111147827B (en) * | 2019-12-27 | 2021-11-02 | 深圳市北斗万方信息技术有限公司 | Signal processing method and device and digital video conversion equipment |
| CN111294573B (en) * | 2020-02-21 | 2021-06-18 | 珠海迈科智能科技股份有限公司 | Satellite television signal receiving device and modulation method |
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