CN219695465U - Navigation satellite signal transponder with single-frequency point switch - Google Patents
Navigation satellite signal transponder with single-frequency point switch Download PDFInfo
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Abstract
The utility model discloses a navigation satellite signal repeater with a single-frequency point switch, which comprises an outdoor receiving antenna, a repeater host and an indoor transmitting antenna, wherein the repeater host comprises a power divider, a down-conversion module, a digital processing module connected with the output end of the down-conversion module, a main control module connected with the output end of the digital processing module, a man-machine interaction module connected with the main control module, an up-conversion module and a power supply unit, the up-conversion module is connected with the digital processing module, the outdoor satellite signal enters the repeater host and is divided into 9 paths of radio frequency signals through the power divider, filtering, amplifying, down-conversion and ADC processing are carried out according to frequency points so as to be used by the digital processing module, the digital processing module carries out digital filtering on signals of each radio frequency channel so as to accurately reserve authorization codes and unauthorized code signals of the required navigation frequency points, and the main control module sends single-frequency point gain adjustment and switching instructions to the up-conversion module so as to realize the single-frequency controllable repeating function.
Description
Technical Field
The utility model relates to the technical field of navigation satellites, in particular to a navigation satellite signal repeater with a single-frequency point switch.
Background
And (3) GNSS: global navigation satellite system (Global Navigation Satellite System), which refers broadly to all satellite navigation systems, including global, regional and augmentation such as GPS in the united states, GLONASS in russia, GALILEO in europe, beidou satellite navigation system BDS in china, and related augmentation systems such as WAAS (wide area augmentation system) in the united states, EGNOS (geostationary navigation overlay system) in europe, and MSAS (multi-function transport satellite augmentation system) in japan, among others, as well as other satellite navigation systems to be built and later on.
Satellite receiver: and receiving GNSS signals for positioning, timing and speed measuring.
BDS: chinese Beidou navigation system. According to the construction of the third stage, the method is divided into a first Beidou, a second Beidou (BDS II) and a third Beidou (BDSIII), the construction of the third Beidou is finished at present, and service provision is started; the navigation frequency points of the second Beidou comprise three frequency points B1, B2 and B3; the Beidou III has four frequency points B1, B2a, B2B and B3. The Beidou navigation frequency point signals currently being applied mainly comprise:
BDS II B1：1561.098±2.046MHz；
BD II B2：1207.14±10.23MHz；
BDSII、BDSIII B3：1268.52±10.23MHz；
BDS III B1：1575.42M±16.368M；
BDS III B2a：1176.45M±10.23M
BDS III B2b：1207.14M±10.23M
GLONASS: the Russian global navigation system comprises G1 1602.5625 +/-4 MHz and G2:1246.4375 + -4 MHz, etc.
GPS: a global positioning system in the united states comprising L1: 1575.42.+ -. 1.023MHz, L2: 1227.6.+ -. 1.023MHz, and L5:1176.45MHz + -10.23M etc.
Multi-model satellite receiver: generally, a satellite receiver can realize a positioning function by receiving one navigation frequency point of a navigation system, but considering that a certain frequency point is easy to be interfered, most of the current satellite receivers are receivers for simultaneously receiving a plurality of navigation frequency points of a plurality of navigation systems and performing joint positioning, and the satellite receivers are commonly called multi-model satellite receivers or multi-frequency satellite receivers.
The current international mature GNSS satellite navigation system comprises GPS, BDS, GLONASS, GALILEO and the like, wherein a plurality of satellites are used for global network deployment, satellite signals are transmitted to low-altitude terminal equipment, and functions of real-time navigation positioning, time service, speed measurement and the like are realized.
The satellite orbit height of GNSS is generally 2-3 ten thousand kilometers, and the satellite signal is very weak when radiating near the earth surface, is easily blocked by leaves and buildings, so that the satellite receiver can not receive signals, or the satellite receiving quantity is insufficient, the DOP value is poor, the positioning precision is poor, and the like, which are unfavorable for the normal work of the satellite receiver. In laboratories, detection and evaluation institutions, weapon test sites and other places, two approaches of navigation signal simulators or satellite signal repeaters are generally adopted for test and test. The conventional satellite signal repeater on the market can completely repeat sky GNSS signals indoors, but cannot switch specified navigation frequency point signals and cannot adjust the power of the specified navigation frequency point signals.
In the prior art, in an indoor area, namely an area where satellite signals cannot directly reach, in order to keep the satellite receiver to keep positioning and time service, a satellite signal repeater is often deployed to repeat outdoor satellite signals indoors for the indoor satellite receiver to keep positioning and time service; the conventional satellite signal repeater mainly comprises four main parts of an outdoor receiving antenna, a radio frequency cable, a plurality of indoor transmitting antennas and a repeater host. The satellite signal transponder is characterized in that the satellite signal transponder is used for receiving an outdoor GNSS navigation signal, is used for being forwarded to an indoor satellite receiver in real time after being subjected to amplification, filtering, power adjustment, power division and the like, and is mainly composed of a filtering amplifying unit, a power adjusting unit, a controller, a digital display tube, a key or command interaction module and the like. The strength of the signal transmitted by the transponder host is adjustable, and is generally adjusted by receiving an external command through a key or a communication interface, adjusting the strength of the transmitted signal, and displaying the relative variation of power adjustment through a nixie tube; there are two broad categories of existing satellite signal transponders. Class 1 is band-pass transponder, adopts simple filtering, amplification principle can be with GNSS navigation signal retransmission indoor, and this kind of transponder can adjust the retransmission signal power, also can independently controllable shut down the retransmission signal, but all to all signals simultaneous switch control and power regulation, can't be to appointed frequency point independent switch and power regulation. Class 2 regenerative transponders, also called purification transponders, add signal parsing and extraction functionality on a class 1 basis. Firstly, according to frequency point and signal type, making receiving analysis and providing spread spectrum code, telegraph text and correspondent carrier wave information of navigation signal, then re-modulating these information and transferring them. The regenerative transponder is difficult to extract and remodulate the authorization code signal, particularly the Beidou three-number authorization code with extremely strong confidentiality is not authorized to be additionally provided with the Beidou authorization code related authorization component, and the regenerative transponder cannot be realized. The regeneration repeater can carry out switch control on the designated frequency point and also can carry out power adjustment on the designated frequency point, so that the basic problem that an indoor satellite receiver uses partial GNSS single-frequency point satellite signals is solved, but the regenerated and repeated signals have no authorization code signals, namely, all navigation frequency point signals cannot be covered. However, in laboratories, detection and evaluation institutions, weapon test sites, and other places, functional performance detection and evaluation of the authorization code and the non-authorization code on each frequency point and each frequency point of the satellite receiver are required, and conventional satellite signal transponders cannot meet actual detection and evaluation requirements, and cannot adopt real signals to detect and evaluate the authorization codes. The laboratory has to adopt the analog signal broadcast by the navigation signal simulator, but the signal broadcast by the navigation signal simulator has certain difference with the actual signal, especially BDS authorization code, almost all navigation signal simulators are not authorized to be additionally provided with related BDS authorization code modules, even if authorization is provided, the BDS authorization code test code is also authorized, and therefore, in the aspect of experimental identification, more true identification and evaluation are difficult to carry out on the signal function performance of all single frequency points of the satellite receiver.
Therefore, the navigation satellite signal repeater with the single-frequency point switch, which can forward the real signals of the navigation system such as GPS, BDS, GLONASS to the indoor place of a laboratory, can independently control the navigation frequency point signals appointed by the switch, can adjust the power of the appointed signals, and can forward the authorization code signals, is a problem worthy of research.
Disclosure of Invention
The utility model aims to provide the navigation satellite signal repeater with the single-frequency point switch, which can not only forward the real signals of the navigation system such as GPS, BDS, GLONASS to a laboratory site, but also independently control the navigation frequency point signals appointed by the switch, can adjust the power of the appointed signals, and can also forward the authorization code signals, so that the functions of single-frequency point switchable control and single-frequency point power adjustment are realized when the real satellite signals are forwarded.
The purpose of the utility model is realized in the following way:
the utility model provides a navigation satellite signal repeater with single frequency point switch, including outdoor receiving antenna, the repeater host computer of being connected through the radio frequency cable with outdoor receiving antenna, the indoor transmitting antenna of being connected through the radio frequency cable with the output of repeater host computer, the repeater host computer includes the power divider of being connected through the radio frequency cable with outdoor receiving antenna, down conversion module who is connected with the power divider output, digital processing module who is connected with the output of down conversion module, the master control module who is connected with the output of digital processing module, man-machine interaction module and up conversion module who is connected with the master control module, power supply unit, up conversion module is connected with digital processing module, outdoor satellite signal gets into the repeater host computer at first through the power divider, divide into 9 way radio frequency signals, carry out filtering according to the frequency point, amplify, down conversion, ADC handles for the use by digital processing module, digital processing module carries out digital filtering to the signal of every radio frequency channel, in order to the accurate reservation of the authorization code and the unauthorized code signal of required navigation frequency point, master control module sends single frequency point gain adjustment and switch instruction, realize single frequency controllable function.
The power divider comprises an amplifying circuit and a power dividing circuit.
The down-conversion module comprises a plurality of radio frequency channels for processing signals with different frequency points, the radio frequency channels comprise a first radio frequency filter, a first low noise amplifier, a first pi-type attenuator, a first mixer, a first intermediate frequency filter and a first AD converter, radio frequency signals are input into the radio frequency channels, the first-stage radio frequency filter performs frequency band selection, the first low noise amplifier performs signal amplification, meanwhile, the first pi-type attenuator is reserved for reserving design allowance for gain adjustment, then the amplified signals are subjected to down-conversion processing, the first mixer mixes the input radio frequency signals with local oscillation signals, outputs intermediate frequency signals with corresponding frequency bands, selects ideal intermediate frequency signals through the first intermediate frequency filter, and outputs the ideal intermediate frequency signals to the first AD converter for digital signal processing.
The digital processing module comprises a temperature compensation crystal oscillator TCXO, a clock, a sampling clock frequency synthesizer, a Field Programmable Gate Array (FPGA) and a memory FLASH for storing an FPGA program, wherein each radio frequency channel outputs digital intermediate frequency signals corresponding to navigation signals to the FPGA, the digital intermediate frequency signals of a plurality of navigation frequency points are respectively subjected to FIR digital filtering in the FPGA, the aim of accurately filtering the appointed navigation frequency points is achieved, other signals outside the frequency points are restrained, and then single frequency point switch control is further carried out; after the FPGA filtering is finished, outputting digital intermediate frequency signals of 9 navigation frequency points to 9 up-conversion channels, and performing DA conversion and up-conversion processing on one navigation frequency point by each up-conversion channel to change the navigation frequency points into radio frequency signals.
The up-conversion module comprises a plurality of up-conversion channels, each up-conversion channel comprises a second AD converter, a second intermediate frequency filter, a second mixer, a second radio frequency filter, a second pi-type attenuator, a second low-noise amplifier and an adjustable attenuator, the up-conversion channels respectively conduct DA conversion on digital intermediate frequency signals output by the digital processing module, convert the digital signals into analog signals, then select a needed frequency band through the second intermediate frequency filter to conduct up-conversion processing, convert the analog intermediate frequency into radio frequency signals with higher frequency, conduct filtering and amplifying to amplify the needed signals to higher intensity, and then complete the function of adjusting single-frequency signal power through the adjustable attenuator.
The main control module is connected with the key board through a group of GPIO, detects key signals in real time and responds to key instructions; the main control module is connected and communicated with the FPGA of the digital processing module through a serial port to acquire the self-checking state of the up-conversion module and the down-conversion module; transmitting a single-frequency point power adjustment and switching instruction; and sending power adjustment and switching instructions to the forwarding channel.
Has the positive beneficial effects that: the utility model adopts the digital filtering technology to accurately separate each navigation frequency point, and then adds the independent switching operation and the single frequency point power adjustment control, thereby not only ensuring the complete forwarding of all navigation signals (including authorization code and unauthorized code signals), but also carrying out switching control and power adjustment on the appointed signals, being convenient for testing and evaluating the functional performance of each frequency point of the satellite receiver in places such as a laboratory, a detection and evaluation mechanism, a weapon test field and the like.
Drawings
FIG. 1 is a block diagram of the structure of the present utility model;
FIG. 2 is a block diagram of a power divider unit of the present utility model;
FIG. 3 is a block diagram of a down conversion module of the present utility model;
FIG. 4 is a block diagram of a down-conversion module of B3 of the present utility model;
FIG. 5 is a block diagram of a digital processing module according to the present utility model;
FIG. 6 is a block diagram of the overall design of an up-conversion module according to the present utility model;
FIG. 7 is a block diagram of an up-conversion module of B3 of the present utility model;
FIG. 8 is a block diagram of a combined power division and RF output channel according to the present utility model;
fig. 9 is a logic relationship diagram of the master control module of the present utility model.
The figure is: the device comprises an outdoor receiving antenna 1, a repeater host 2, an indoor transmitting antenna 3, a power divider 21, a down-conversion module 22, a digital processing module 23, a main control module 24, an up-conversion module 25, a man-machine interaction unit 26 and a power supply unit 27.
Description of the embodiments
The utility model is further described below with reference to the drawings and examples.
As shown in fig. 1, a navigation satellite signal repeater with a single-frequency point switch comprises an outdoor receiving antenna 1, a repeater host 2 connected with the outdoor receiving antenna 1 through a radio frequency cable, and an indoor transmitting antenna 3 connected with the output end of the repeater host 2 through the radio frequency cable, wherein the outdoor receiving antenna is installed in the open air to receive BDS, GPS, GLONASS navigation satellite signals; the repeater host 2 comprises a power divider 21 connected with an outdoor receiving antenna through a radio frequency cable, a down-conversion module 22 connected with the output end of the power divider 21, a digital processing module 23 connected with the output end of the down-conversion module 22, a main control module 24 connected with the output end of the digital processing module 23, a man-machine interaction module 26 connected with the main control module 24, an up-conversion module 25 and a power supply unit 27, wherein the up-conversion module 25 is connected with the digital processing module 23, outdoor satellite signals enter the repeater host 1 and are firstly divided into 9 paths of radio frequency signals through the power divider 21, filtering, amplifying, down-conversion and ADC processing are carried out according to frequency points so as to be used by the digital processing module, the digital processing module carries out digital filtering on signals of each radio frequency channel so as to accurately reserve authorization codes and unauthorized code signals of required navigation frequency points, and the main control module sends single-frequency point gain adjustment and switching instructions to the up-conversion module so as to realize a single-frequency controllable repeating function.
As shown in fig. 2, the power divider includes an amplifying circuit and a power dividing circuit. The amplifying circuit is completed by a low noise amplifier. The frequency range is 5 MHz-4000 MHz, and the coverage frequency points and signals are as follows:
1) BDIII B2a signal (1176.45 MHz.+ -. 10.23 MHz);
2) BDII B2 frequency points (1207.14 MHz.+ -. 10.23 MHz);
3) GPS L2 frequency point (1227.6 MHz.+ -. 1.023 MHz);
4) GLONASS G2 frequency point (1246.4375 MHz.+ -. 4 MHz);
5) BDII/BDIII B3 frequency points (1268.52 MHz.+ -. 10.23 MHz);
6) BDII/BDIII B1 frequency points (1561.098 MHz.+ -. 2.046 MHz);
7) GPS L1, BDIII B1C frequency points (1575.42 MHz + -2.046 MHz);
8) GLONASS G1 frequency point (1602.5625 MHz.+ -. 4 MHz);
9) BDIII B1A signal (1575.42 MHz.+ -. 16.368 MHz).
The power dividing circuit is completed by a power dividing device and divides the amplified radio frequency signal into 9 paths of radio frequency signals.
As shown in fig. 3 and fig. 4, the down-conversion module includes a plurality of radio frequency channels for processing signals with different frequency points, the radio frequency channels include a first radio frequency filter, a first low noise amplifier, a first pi-type attenuator, a first mixer, a first intermediate frequency filter and a first AD converter, the radio frequency signals are input to the radio frequency channels, the first stage radio frequency filter performs frequency band selection, the first low noise amplifier performs signal amplification, meanwhile, the first pi-type attenuator is reserved for gain adjustment, a design allowance is reserved for gain adjustment, then the amplified signals are subjected to down-conversion processing, the first mixer mixes the input radio frequency signals with local oscillation signals, outputs intermediate frequency signals with corresponding frequency bands, selects ideal intermediate frequency signals through the first intermediate frequency filter, and outputs the ideal intermediate frequency signals to the first AD converter for digital signal processing. All navigation signals of the GPS, BDS and GLONASS are divided according to frequency bands and divided into 9 frequency point signals, each frequency point signal is processed by independent radio frequency channels, as shown in figure 3, the 9 radio frequency channels respectively process the 9 frequency point signals, and 9 paths of digital intermediate frequency signals are output to a digital processing module for digital filter processing.
Taking a B3 radio frequency channel as an example, the B3 radio frequency channel performs functions of filtering, down-conversion, AD conversion and the like of a B3 frequency point (1268.52 mhz±10.23 MHz), as shown in fig. 4, a B3 frequency point signal is input to the B3 radio frequency module, a first stage radio frequency filter performs frequency band selection, a first low noise amplifier performs signal amplification, a first pi-type attenuator is reserved for reserving a design margin for gain adjustment, then the amplified signal is subjected to down-conversion processing, a first mixer mixes the input radio frequency signal with a local oscillator signal, outputs an intermediate frequency signal of a corresponding frequency band, selects an ideal intermediate frequency signal through the intermediate frequency filter, and outputs the ideal intermediate frequency signal to a first AD converter for digital signal processing.
As shown in fig. 5, the digital processing module includes a temperature compensation crystal oscillator TCXO, a clock, a sampling clock frequency synthesizer, a field programmable gate array processor FPGA, and a memory FLASH for storing FPGA programs, where each radio frequency channel outputs digital intermediate frequency signals corresponding to navigation signals to the FPGA, and the digital intermediate frequency signals of multiple navigation frequency points are respectively subjected to FIR digital filtering in the FPGA, so as to achieve accurate filtering on specified navigation frequency points, inhibit other signals outside the frequency points, and further perform single frequency point switch control; after the FPGA filtering is finished, outputting digital intermediate frequency signals of 9 navigation frequency points to 9 up-conversion channels, and performing DA conversion and up-conversion processing on one navigation frequency point by each up-conversion channel to change the navigation frequency points into radio frequency signals. The clock source of the digital processing module selects a TCXO of 10MHz, and the TCXO is transmitted to the down-conversion unit and the up-conversion module after passing through the clock buffer.
As shown in fig. 6 and fig. 7, the up-conversion module includes a plurality of up-conversion channels, where the up-conversion channels include a second AD converter, a second intermediate frequency filter, a second mixer, a second radio frequency filter, a second pi-type attenuator, a second low noise amplifier, and an adjustable attenuator, and the up-conversion channels respectively perform DA conversion on the digital intermediate frequency signals output by the digital processing module, and the digital processing module outputs 9 digital intermediate frequency signals of B2A, BD B2, GPS L2, GLONASS G2, BD B3, BD B1, GPS L1, B1C, GLONASS G1, B1A, and the like to the up-conversion module. The up-conversion module is provided with 9 paths of up-conversion channels, converts digital signals into analog signals, then selects a required frequency band through a second intermediate frequency filter to carry out up-conversion treatment, converts the analog intermediate frequency into radio frequency signals with higher frequency, then carries out filtering and amplification to amplify the required signals to higher strength, and then completes the function of adjusting the power of single-frequency signals through an adjustable attenuator; taking the B3 up-conversion channel as an example, the local oscillator reference clock of the B3 up-conversion channel comes from the clock unit of the digital processing module, and the FPGA outputs the B3 digital intermediate frequency and the accompanying clock to the B3 up-conversion channel. The FPGA configures a B3 up-conversion channel through the SPI. An adjustable attenuator is designed in the up-conversion channel, and an FPGA sends an adjustable attenuation instruction to adjust the signal intensity of the B3 frequency point.
As shown in fig. 8, 9 paths of radio frequency signals output by the up-conversion module are synthesized into 1 path of radio frequency signals through a combiner, and then are divided into 4 paths of radio frequency signals through 1 power divider, each path of radio frequency output channel is provided with an internal adjustable attenuator and a radio frequency switch, so that the gain of the 4 paths of signals is respectively adjustable, and the independent switch control of the 4 paths of radio frequency output channels is realized. And a man-machine interaction unit initiates a signal adjusting instruction and a signal switching instruction, and then an FPGA sends a power adjusting signal and a switching signal to a designated radio frequency output channel.
As shown in fig. 9, the main control module controls the working modes and signal intensity adjustment of each module of the host, and (1) the main control module is connected with the display control module through a serial port and sends self-checking state, power adjustment and switching state of each navigation frequency point, power and switching state of each forwarding channel, satellite signal distribution diagram, time position information, quality monitoring state data and the like to the display screen.
The main control module is connected with the key board through a group of GPIO, detects key signals in real time and responds to key instructions; the main control module is connected and communicated with the FPGA of the digital processing module through a serial port to acquire the self-checking state of the up-conversion module and the down-conversion module; transmitting a single-frequency point power adjustment and switching instruction; and sending power adjustment and switching instructions to the forwarding channel.
Claims (6)
1. The utility model provides a navigation satellite signal repeater with single frequency point switch, includes outdoor receiving antenna, passes through the repeater host computer that radio frequency cable is connected with outdoor receiving antenna, passes through the indoor transmitting antenna that radio frequency cable is connected with the output of repeater host computer, its characterized in that: the repeater host comprises a power divider connected with an outdoor receiving antenna through a radio frequency cable, a down-conversion module connected with the output end of the power divider, a digital processing module connected with the output end of the down-conversion module, a main control module connected with the output end of the digital processing module, a man-machine interaction module connected with the main control module, an up-conversion module and a power supply unit, wherein the up-conversion module is connected with the digital processing module, outdoor satellite signals enter the repeater host and are firstly divided into 9 paths of radio frequency signals through the power divider, the 9 paths of radio frequency signals are subjected to filtering, amplifying, down-conversion and ADC processing according to frequency points, so that the signals of each radio frequency channel are subjected to digital filtering by the digital processing module, authorization codes and unauthorized code signals of needed navigation frequency points are accurately reserved, and the main control module transmits single-frequency point gain adjustment and switching instructions to the up-conversion module, so that a single-frequency controllable repeating function is realized.
2. The navigation satellite signal repeater with single-frequency point switch according to claim 1, wherein: the power divider comprises an amplifying circuit and a power dividing circuit.
3. The navigation satellite signal repeater with single-frequency point switch according to claim 1, wherein: the down-conversion module comprises a plurality of radio frequency channels for processing signals with different frequency points, the radio frequency channels comprise a first radio frequency filter, a first low noise amplifier, a first pi-type attenuator, a first mixer, a first intermediate frequency filter and a first AD converter, radio frequency signals are input into the radio frequency channels, the first-stage radio frequency filter performs frequency band selection, the first low noise amplifier performs signal amplification, meanwhile, the first pi-type attenuator is reserved for reserving design allowance for gain adjustment, then the amplified signals are subjected to down-conversion processing, the first mixer mixes the input radio frequency signals with local oscillation signals, outputs intermediate frequency signals with corresponding frequency bands, selects ideal intermediate frequency signals through the first intermediate frequency filter, and outputs the ideal intermediate frequency signals to the first AD converter for digital signal processing.
4. The navigation satellite signal repeater with single-frequency point switch according to claim 1, wherein: the digital processing module comprises a temperature compensation crystal oscillator TCXO, a clock, a sampling clock frequency synthesizer, a Field Programmable Gate Array (FPGA) and a memory FLASH for storing an FPGA program, wherein each radio frequency channel outputs digital intermediate frequency signals corresponding to navigation signals to the FPGA, the digital intermediate frequency signals of a plurality of navigation frequency points are respectively subjected to FIR digital filtering in the FPGA, the aim of accurately filtering the appointed navigation frequency points is achieved, other signals outside the frequency points are restrained, and then single frequency point switch control is further carried out; after the FPGA filtering is finished, outputting digital intermediate frequency signals of 9 navigation frequency points to 9 up-conversion channels, and performing DA conversion and up-conversion processing on one navigation frequency point by each up-conversion channel to change the navigation frequency points into radio frequency signals.
5. The navigation satellite signal repeater with single-frequency point switch according to claim 1, wherein: the up-conversion module comprises a plurality of up-conversion channels, each up-conversion channel comprises a second AD converter, a second intermediate frequency filter, a second mixer, a second radio frequency filter, a second pi-type attenuator, a second low-noise amplifier and an adjustable attenuator, the up-conversion channels respectively conduct DA conversion on digital intermediate frequency signals output by the digital processing module, convert the digital signals into analog signals, then select a needed frequency band through the second intermediate frequency filter to conduct up-conversion processing, convert the analog intermediate frequency into radio frequency signals with higher frequency, conduct filtering and amplifying to amplify the needed signals to higher intensity, and then complete the function of adjusting single-frequency signal power through the adjustable attenuator.
6. The navigation satellite signal repeater with single-frequency point switch according to claim 1, wherein: the main control module is connected with the key board through a group of GPIO, detects key signals in real time and responds to key instructions; the main control module is connected and communicated with the FPGA of the digital processing module through a serial port to acquire the self-checking state of the up-conversion module and the down-conversion module; transmitting a single-frequency point power adjustment and switching instruction; and sending power adjustment and switching instructions to the forwarding channel.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117081660A (en) * | 2023-10-12 | 2023-11-17 | 齐鲁卫星技术(山东)有限责任公司 | Wide-beam hidden transmitting platform for synchronous orbit satellite platform |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117081660A (en) * | 2023-10-12 | 2023-11-17 | 齐鲁卫星技术(山东)有限责任公司 | Wide-beam hidden transmitting platform for synchronous orbit satellite platform |
| CN117081660B (en) * | 2023-10-12 | 2024-01-16 | 齐鲁卫星技术(山东)有限责任公司 | Wide-beam hidden transmitting platform for synchronous orbit satellite platform |
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