Satellite signal forwarding system and method supporting compass short message communication and positioning

Abstract

The application relates to the technical field of satellite navigation and wireless communication, in particular to a satellite signal transfer system and method supporting Beidou short message communication and positioning, which comprises an indoor antenna, an outdoor antenna and a transfer device; the indoor antenna is connected with the transfer device through an indoor radio frequency cable and the like. The application realizes physical isolation of uplink and downlink signals by arranging a positioning signal transfer link and a short message communication signal transfer link which are independent of each other; cavity filters are used to suppress the crosstalk of uplink transmission signals on a downlink receiving path; a closed loop gain adjustment mechanism is formed by a coupling network unit, a detector, a follower and a single chip, input power is detected in real time, and a digital control attenuator is dynamically adjusted, so that stable output of short message signals is guaranteed, thereby realizing reliable coverage of Beidou positioning signals and stable transfer of short message communication in a satellite signal shielding scene such as an indoor or underground scene, and the system has power detection and gain adjustment capabilities.

Description

Technical Field

[0001] This invention relates to the field of satellite navigation and wireless communication technology, and more specifically to a satellite signal forwarding system and method that supports BeiDou short message communication and positioning. Background Technology

[0002] The BeiDou Navigation Satellite System (BDS) provides positioning, timing, and short message communication services and has been widely used in transportation, emergency rescue, power line inspection, mine monitoring, and field operations. However, in scenarios where satellite signals are severely blocked or interfered with, such as indoor buildings, underground tunnels, enclosed spaces like ship cabins, and electromagnetic shielding test rooms, user terminal equipment cannot reliably receive BeiDou satellite positioning signals due to the low signal-to-noise ratio, nor can it reliably send short message communication signals to the satellite, resulting in a double blind spot for both positioning and communication. Existing satellite signal forwarding equipment mainly adopts a one-way forwarding architecture: although its positioning signal forwarding link can amplify and forward the BeiDou satellite positioning signal received outdoors to indoors, it is not equipped with an independent short message communication signal forwarding link, which cannot support the terminal equipment to send short messages back to the satellite. Although some equipment has tried to integrate bidirectional functions, its positioning signal forwarding link and short message communication signal forwarding link share the radio frequency channel and filtering devices, which makes the downlink positioning signal susceptible to crosstalk from the uplink short message transmission signal, resulting in degraded positioning accuracy. In addition, its short message communication signal forwarding link lacks power detection and dynamic gain adjustment capabilities, resulting in insufficient uplink communication reliability of the terminal equipment. Therefore, it is necessary to provide a satellite signal forwarding system and method that can simultaneously achieve positioning signal coverage and BeiDou short message communication forwarding in scenarios where satellite signals are blocked, and can perform power detection and gain adjustment on the short message communication signals. Summary of the Invention

[0003] The purpose of this invention is to solve the above-mentioned technical problems by providing a satellite signal forwarding system and method that can simultaneously achieve positioning signal coverage and BeiDou short message communication forwarding in scenarios where satellite signals are blocked, and can perform power detection and gain adjustment on the short message communication signals.

[0004] To achieve the above objectives, the present invention specifically adopts the following technical solution: This invention provides a satellite signal forwarding system supporting BeiDou short message communication and positioning, including an indoor antenna, an outdoor antenna, and a repeater. The indoor antenna is connected to the repeater via an indoor radio frequency cable, and the outdoor antenna is connected to the repeater via an outdoor radio frequency cable. The repeater is equipped with a repeater module. The repeater module includes independent positioning signal forwarding links and short message communication signal forwarding links. The positioning signal forwarding link is configured to receive BeiDou satellite positioning signals input through the outdoor antenna, perform filtering and amplification processing sequentially, and output the processed positioning signal to the indoor antenna via the indoor radio frequency cable. The short message communication signal forwarding link is configured to receive BeiDou short message communication signals input through the indoor antenna, perform power detection, gain adjustment, filtering, and amplification processing sequentially, and output the processed short message communication signal to the outdoor antenna via the outdoor radio frequency cable.

[0005] According to one embodiment of the present invention, the relay module includes an indoor interface unit, an indoor power supply network unit, a power network unit, a power interface unit, a first-stage frequency divider network unit, a coupling network unit, a digitally controlled attenuator, a detector, a follower, a microcontroller, a debugging interface unit, a data transmission interface unit, an uplink RF amplifier, a second-stage frequency divider network unit, a downlink RF amplifier, a filter input interface unit, a filter output interface unit, an outdoor power supply network unit, and an outdoor interface unit; the indoor interface unit is connected to the indoor power supply network unit; the indoor power supply network unit is connected to the power network unit and the first-stage frequency divider network unit respectively; the first-stage frequency divider network unit is connected to the coupling network unit and the filter output interface unit respectively; the coupling network unit is connected to the digitally controlled attenuator and the detector respectively; the digitally controlled attenuator is connected to the microcontroller and the uplink RF amplifier respectively; the detector is connected to the microcontroller through a follower; the microcontroller is connected to the debugging interface unit and the data transmission interface unit respectively; the uplink RF amplifier is connected to the second-stage frequency divider network unit; the second-stage frequency divider network unit is connected to the downlink RF amplifier and the outdoor power supply network unit respectively. The system includes the following components: an outdoor power supply network unit connected to a power network unit and an outdoor interface unit; a downlink RF amplifier connected to a filter input interface unit; a power network unit connected to a power interface unit; and filter input and output interface units connected to a cavity filter. The short message communication signal forwarding link is configured as follows: sequentially via an indoor antenna, indoor RF cable, indoor interface unit, indoor power supply network unit, first-level frequency division network unit, coupling network unit, digitally controlled attenuator, uplink RF amplifier, second-level frequency division network unit, outdoor power supply network unit, outdoor interface unit, and outdoor RF cable to the outdoor antenna. The positioning signal forwarding link is configured as follows: sequentially via an outdoor antenna, outdoor RF cable, outdoor interface unit, outdoor power supply network unit, second-level frequency division network unit, downlink RF amplifier, filter input interface unit, cavity filter, filter output interface unit, first-level frequency division network unit, indoor power supply network unit, indoor interface unit, and indoor RF cable to the indoor antenna. The relay module is located within a repeater, which is the physical device carrying the relay module.

[0006] According to one embodiment of the present invention, the coupling network unit is configured to couple a detection signal from a short message communication signal; the detector is configured to perform power detection on the detection signal to generate a detection voltage; the follower is configured to amplify the detection voltage to improve its driving capability for acquisition by a microcontroller; and the microcontroller is configured to generate a gain control signal based on the detection voltage and control the attenuation of the numerically controlled attenuator based on the gain control signal.

[0007] According to one embodiment of the present invention, a power supply module is further included; the power supply module includes a power adapter and a power network unit; the power adapter is configured to convert external AC power into DC power and input it to the power network unit via a power interface unit; the power network unit is configured to perform voltage conversion, filtering and voltage regulation on the DC power to generate a set of operating voltages for use by each functional unit in the relay module.

[0008] According to one embodiment of the present invention, the cavity filter is configured to: perform frequency selective filtering on the BeiDou satellite positioning signal output by the downlink RF amplifier, suppress the transmitted signal leaked through the second-level frequency division network unit in the short message communication signal forwarding link, and enter the positioning signal forwarding link through the filter input interface unit, the cavity filter and the filter output interface unit in reverse coupling.

[0009] According to one embodiment of the present invention, the repeater includes a chassis cover, a chassis body, a printed circuit board, a chassis panel, and a power adapter; one side of the chassis body is closed, and the other side has a chassis panel; the bottom of the chassis body is closed, and the top of the chassis body has a chassis cover; the printed circuit board, cavity filter, and power adapter are all screwed into fixing stud holes provided at the bottom of the chassis body; the chassis panel has: a data transmission interface slot, electrically connected to a data transmission interface unit on the printed circuit board via printed wires; a serial port debugging interface slot, electrically connected to a debugging interface unit on the printed circuit board via printed wires; and a first antenna interface slot. The indoor interface slot is electrically connected to the indoor interface unit on the printed circuit board via printed wires; the outdoor interface slot is electrically connected to the outdoor interface unit on the printed circuit board via printed wires; the AC power interface slot is electrically connected to the power interface unit on the printed circuit board via printed wires; the printed circuit board integrates an indoor interface unit, an indoor power supply network unit, a power supply network unit, a first-stage frequency divider network unit, a coupling network unit, a digitally controlled attenuator, a detector, a follower, a microcontroller, a debugging interface unit, a data transmission interface unit, an uplink RF amplifier, a second-stage frequency divider network unit, a downlink RF amplifier, an outdoor power supply network unit, and an outdoor interface unit.

[0010] According to one embodiment of the present invention, the printed circuit board includes: a first on-board serial digital connector, which is a functional implementation unit for a debugging interface unit; a second on-board serial digital connector, which is a functional implementation unit for a data transmission interface unit; a first radio frequency connector, which is a functional implementation unit for an indoor interface unit; a filter output connector, which is a functional implementation unit for a filter output interface unit; a filter input connector, which is a functional implementation unit for a filter input interface unit; a second radio frequency connector, which is a functional implementation unit for an outdoor interface unit; an integrated circuit chip, which is a functional implementation unit for a microcontroller; a detector chip, which is a functional implementation unit for a detector; an operational amplifier voltage follower chip, which is a functional implementation unit for a follower; and a coupler chip, which is a functional implementation unit for a coupling network unit. The system includes: a numerically controlled attenuation chip (for implementing the function of a numerically controlled attenuator); an on-board power supply chip (for implementing the function of a power network unit); an on-board power input port (for implementing the function of a power interface unit); an outdoor power supply circuit (for implementing the function of an outdoor power supply network unit); an uplink RF amplifier chip (for implementing the function of an uplink RF amplifier); an uplink narrowband filter (for implementing the filtering function in the short message communication signal forwarding link); an outdoor power divider chip (for implementing the function of a second-stage frequency division network unit); a downlink RF amplifier chip (for implementing the function of a downlink RF amplifier); an indoor power divider chip (for implementing the function of a first-stage frequency division network unit); and an indoor power supply circuit (for implementing the function of an indoor power supply network unit).

[0011] According to one embodiment of the present invention, the printed circuit board is provided with a mounting area for mounting a shielding cover, the shielding cover being used to electromagnetically shield the radio frequency circuits in the short message communication signal forwarding link and / or the positioning signal forwarding link.

[0012] This invention also provides a satellite signal forwarding method supporting BeiDou short message communication and positioning. Based on the above embodiments, this invention also provides a satellite signal forwarding system supporting BeiDou short message communication and positioning, comprising: receiving BeiDou satellite positioning signals through an outdoor antenna and transmitting the BeiDou satellite positioning signals to an outdoor interface unit in a relay module via an outdoor radio frequency cable; filtering and amplifying the BeiDou satellite positioning signals through a positioning signal forwarding link in the relay module, sequentially passing through an outdoor power supply network unit, a second-level frequency division network unit, a downlink radio frequency amplifier, a filter input interface unit, a cavity filter, a filter output interface unit, a first-level frequency division network unit, an indoor power supply network unit, and an indoor interface unit, and transmitting the processed BeiDou satellite positioning signals to an indoor antenna via an indoor radio frequency cable; receiving BeiDou short message communication signals from terminal equipment through the indoor antenna and transmitting the BeiDou satellite positioning signals to an indoor interface unit via an indoor radio frequency cable. The BeiDou short message communication signal is transmitted to the indoor interface unit in the relay module; a detection signal is coupled out from the BeiDou short message communication signal through the coupling network unit in the relay module; the detection signal is power-detected by a detector to generate a detection voltage, and the detection voltage is amplified by a follower to improve its driving capability for acquisition by the microcontroller; the microcontroller generates a gain control signal based on the detection voltage, and controls the attenuation of the digitally controlled attenuator based on the gain control signal to adjust the link gain of the short message communication signal forwarding link; the uplink RF amplifier amplifies the gain-adjusted BeiDou short message communication signal, and filters it through an uplink narrowband filter; the processed BeiDou short message communication signal is transmitted sequentially through the second-level frequency division network unit, the outdoor feeder network unit, and the outdoor interface unit, and then through the outdoor RF cable to the outdoor antenna; the processed BeiDou short message communication signal is forwarded to the BeiDou satellite through the outdoor antenna.

[0013] The beneficial effects of this invention are as follows: This invention achieves physical isolation between uplink and downlink signals by setting up independent positioning signal forwarding links and short message communication signal forwarding links; it uses cavity filters to suppress crosstalk between uplink transmitted signals and downlink received signals; and it employs a closed-loop gain adjustment mechanism composed of coupled network units, detectors, followers, and a microcontroller to detect input power in real time and dynamically adjust the digitally controlled attenuator to ensure stable output of short message signals. Thus, in scenarios where satellite signals are blocked, such as indoors and underground, it simultaneously achieves reliable coverage of BeiDou positioning signals and stable forwarding of short message communication, and also has power detection and gain adjustment capabilities. Attached Figure Description

[0014] Figure 1 This is a framework diagram of the forwarding system described in this invention; Figure 2 This is a framework diagram of the relay module described in this invention; Figure 3 This is a schematic diagram of the structure of the transfer device described in this invention; Figure 4 This is a schematic diagram of the printed circuit board structure of the present invention.

[0015] Figure 5 This is a schematic diagram of the test results of an embodiment of the present invention.

[0016] Reference numerals: 101, Indoor antenna; 102, Outdoor antenna; 103, Relay module; 104, Power supply module; 105, Positioning signal forwarding link; 106, Short message communication signal forwarding link; 200. Repeater; 201. Chassis top cover; 202. Cavity filter; 203. Printed circuit board; 204. Chassis enclosure; 205. Chassis front panel; 206. Data transmission interface slot; 207. Serial port debugging interface slot; 208. First antenna interface slot; 209. Second antenna interface slot; 210. AC power interface slot; 211. Fixing stud hole; 212. Power adapter; 301. Indoor Interface Unit; 302. Indoor Power Supply Network Unit; 303. Power Network Unit; 304. Power Interface Unit; 305. First-Stage Frequency Division Network Unit; 306. Coupling Network Unit; 307. Digitally Controlled Attenuator; 308. Detector; 309. Follower; 310. Microcontroller; 311. Debugging Interface Unit; 312. Data Transmission Interface Unit; 313. Uplink RF Amplifier; 314. Second-Stage Frequency Division Network Unit; 315. Downlink RF Amplifier; 316. Filter Input Interface Unit; 317. Filter Output Interface Unit; 318. Outdoor Power Supply Network Unit; 319. Outdoor Interface Unit; 401. First board serial digital connector; 402. Second board serial digital connector; 403. First RF connector; 404. Filter output connector; 405. Filter input connector; 406. Second RF connector; 407. Integrated circuit chip; 408. Detector chip; 409. Operational amplifier voltage follower chip; 410. Coupler chip; 411. Digitally controlled attenuator chip; 412. On-board power supply chip; 413. On-board power input port; 414. Outdoor power supply circuit; 415. Uplink RF amplifier chip; 416. Uplink narrowband filter; 417. Outdoor power divider chip; 418. Downlink RF amplifier chip; 419. Indoor power divider chip; 420. Indoor power supply circuit. Detailed Implementation Example:

[0017] Reference Figure 1As shown, this invention provides a satellite signal forwarding system supporting BeiDou short message communication and positioning, including an indoor antenna 101, an outdoor antenna 102, and a repeater 200; the indoor antenna 101 is connected to the repeater 200 via an indoor radio frequency cable, and the outdoor antenna 102 is connected to the repeater 200 via an outdoor radio frequency cable; the repeater 200 is provided with a repeater module 103; the repeater 200 contains the repeater module 103, and the repeater module 103 includes independent positioning signal forwarding links 105 and short message communication links. The positioning signal forwarding link 105 is configured to receive the BeiDou satellite positioning signal input through the outdoor antenna 102, perform filtering and amplification processing in sequence, and output the processed positioning signal to the indoor antenna 101 via an indoor radio frequency cable; the short message communication signal forwarding link 106 is configured to receive the BeiDou short message communication signal input through the indoor antenna 101, perform power detection, gain adjustment, filtering and amplification processing in sequence, and output the processed short message communication signal to the outdoor antenna 102 via an outdoor radio frequency cable.

[0018] Reference Figure 2As shown, the relay module 103 includes an indoor interface unit 301, an indoor power supply network unit 302, a power network unit 303, a power interface unit 304, a first-stage frequency divider network unit 305, a coupling network unit 306, a digitally controlled attenuator 307, a detector 308, a follower 309, a microcontroller 310, a debugging interface unit 311, a data transmission interface unit 312, an uplink RF amplifier 313, a second-stage frequency divider network unit 314, a downlink RF amplifier 315, a filter input interface unit 316, a filter output interface unit 317, an outdoor power supply network unit 318, and an outdoor interface unit 319; the indoor interface unit 301 is connected to the indoor power supply network unit 302; the indoor power supply network... Network unit 302 is connected to power network unit 303 and first-stage frequency divider network unit 305 respectively; first-stage frequency divider network unit 305 is connected to coupling network unit 306 and filter output interface unit 317 respectively; coupling network unit 306 is connected to digitally controlled attenuator 307 and detector 308 respectively; digitally controlled attenuator 307 is connected to microcontroller 310 and uplink RF amplifier 313 respectively; detector 308 is connected to microcontroller 310 through follower 309; microcontroller 310 is connected to debugging interface unit 311 and data transmission interface unit 312 respectively; uplink RF amplifier 313 is connected to second-stage frequency divider network unit 314; second-stage frequency divider network unit 314 is connected to downlink RF amplifier 315 and outdoor power supply respectively. Network unit 318 is connected; outdoor power supply network unit 318 is connected to power network unit 303 and outdoor interface unit 319 respectively; downlink RF amplifier 315 is connected to filter input interface unit 316; power network unit 303 is connected to power interface unit 304; filter input interface unit 316 and filter output interface unit 317 are both connected to cavity filter 202; the short message communication signal forwarding link 106 is configured as follows: sequentially via indoor antenna 101, indoor RF cable, indoor interface unit 301, indoor power supply network unit 302, first-stage frequency division network unit 305, coupling network unit 306, digitally controlled attenuator 307, uplink RF amplifier 313, and second-stage frequency division network unit 314. The system includes an outdoor power supply network unit 318, an outdoor interface unit 319, an outdoor RF cable, and an outdoor antenna 102. The positioning signal forwarding link 105 is configured as follows: sequentially passing through the outdoor antenna 102, the outdoor RF cable, the outdoor interface unit 319, the outdoor power supply network unit 318, the second-level frequency division network unit 314, the downlink RF amplifier 315, the filter input interface unit 316, the cavity filter 202, the filter output interface unit 317, the first-level frequency division network unit 305, the indoor power supply network unit 302, the indoor interface unit 301, and the indoor RF cable to the indoor antenna 101. The relay module 103 is located within the repeater 200, which is the physical device that carries the relay module 103. The numerically controlled attenuator model is HMC624LP4E; The coupling network unit 306 is configured to couple a detection signal from the short message communication signal; the detector 308 is configured to perform power detection on the detection signal and generate a detection voltage; the follower 309 is configured to amplify the detection voltage to improve its driving capability for acquisition by the microcontroller; the microcontroller 310 is configured to generate a gain control signal based on the detection voltage and control the attenuation of the digitally controlled attenuator 307 based on the gain control signal. Specifically, the short message communication signal forwarding link includes a digitally controlled attenuator. The microcontroller generates a gain control signal based on the detection voltage and controls the attenuation of the digitally controlled attenuator to stabilize the power of the short message communication signal output to the outdoor antenna at +10dBm±0.5dB. The digitally controlled attenuator is controlled by the microcontroller via the SPI bus. The system also includes a power supply module 104; the power supply module 104 includes a power adapter 212 and a power network unit 303; the power adapter 212 is configured to convert external AC power into DC power and input it to the power network unit 303 via the power interface unit 304; the power network unit 303 is configured to perform voltage conversion, filtering and voltage regulation on the DC power to generate a set of working voltages for use by each functional unit in the relay module 103; The power network unit is configured to perform voltage conversion, filtering and voltage regulation on the DC power to generate +5V and +3.3V operating voltages, and the power adapter converts 220V AC power to 24V DC power; The cavity filter 202 is configured to: perform frequency selective filtering on the BeiDou satellite positioning signal output by the downlink RF amplifier 315, and suppress the transmitted signal leaked through the second-level frequency division network unit 314 in the short message communication signal forwarding link 106, and enter the positioning signal forwarding link 105 through the filter input interface unit 316, the cavity filter 202 and the filter output interface unit 317 in reverse coupling. The cavity filter is configured to perform frequency selective filtering on BeiDou B1 and B3 band satellite positioning signals and the short message S receiving band. The passband of the cavity filter includes the positioning band of 1.1~1.59GHz and the short message S receiving band of 2.483~2.5GHz, and the stopband includes the short message L transmitting band of 1.61~1.626GHz. The dimensions are 59mm×39mm×46mm. The cavity filter has an out-of-band rejection of ≥60dB at 1.616GHz. Reference Figure 3As shown, the repeater 200 includes a chassis cover 201, a chassis body 204, a printed circuit board 203, a chassis panel 205, and a power adapter 212; one side of the chassis body 204 is closed, and the other side has a chassis panel 205; the bottom of the chassis body 204 is closed, and the top of it has a chassis cover 201; the printed circuit board 203, the cavity filter 202, and the power adapter 212 are all bolted to the fixing stud holes 211 provided at the bottom of the chassis body 204; the repeater's external dimensions are 482mm × 268mm × 88mm; The chassis panel 205 includes: a data transmission interface slot 206, electrically connected to the data transmission interface unit 312 on the printed circuit board 203 via printed wires; a serial port debugging interface slot 207, electrically connected to the debugging interface unit 311 on the printed circuit board 203 via printed wires; a first antenna interface slot 208, electrically connected to the indoor interface unit 301 on the printed circuit board 203 via printed wires; a second antenna interface slot 209, electrically connected to the outdoor interface unit 319 on the printed circuit board 203 via printed wires; and an AC power interface slot 210, electrically connected to the printed power interface unit 301 on the printed circuit board 203 via printed wires. The power interface unit 304 on the circuit board 203 is electrically connected; the printed circuit board 203 integrates an indoor interface unit 301, an indoor power supply network unit 302, a power supply network unit 303, a first-stage frequency divider network unit 305, a coupling network unit 306, a digitally controlled attenuator 307, a detector 308, a follower 309, a microcontroller 310, a debugging interface unit 311, a data transmission interface unit 312, an uplink RF amplifier 313, a second-stage frequency divider network unit 314, a downlink RF amplifier 315, an outdoor power supply network unit 318, and an outdoor interface unit 319; The serial port debugging interface slot is a DB9 female connector; The uplink RF amplifier model is TQL9092; The downlink RF amplifier model is GSL805AD; The detector model is AD8313, and the follower model is AD8065; The microcontroller model is STM32H743VI; Reference Figure 4As shown, the printed circuit board 203 includes: a first-board serial digital connector 401, which is a functional implementation unit of the debugging interface unit 311; a second-board serial digital connector 402, which is a functional implementation unit of the data transmission interface unit 312; a first radio frequency connector 403, which is a functional implementation unit of the indoor interface unit 301; a filter output connector 404, which is a functional implementation unit of the filter output interface unit 317; a filter input connector 405, which is a functional implementation unit of the filter input interface unit 316; a second radio frequency connector 406, which is a functional implementation unit of the outdoor interface unit 319; an integrated circuit chip 407, which is a functional implementation unit of the microcontroller 310; a detector chip 408, which is a functional implementation unit of the detector 308; an operational amplifier voltage follower chip 409, which is a functional implementation unit of the follower 309; and a coupler chip 410, which is a functional implementation unit of the coupling network unit 306. The system includes: a numerically controlled attenuation chip 411, which implements the function of the numerically controlled attenuator 307; an on-board power supply chip 412, which implements the function of the power network unit 303; an on-board power input port 413, which implements the function of the power interface unit 304; an outdoor power supply circuit 414, which implements the function of the outdoor power supply network unit 318; an uplink RF amplifier chip 415, which implements the function of the uplink RF amplifier 313; an uplink narrowband filter 416, which implements the filtering function in the short message communication signal forwarding link 106; an outdoor power divider chip 417, which implements the function of the second-stage frequency division network unit 314; a downlink RF amplifier chip 418, which implements the function of the downlink RF amplifier 315; an indoor power divider chip 419, which implements the function of the first-stage frequency division network unit 305; and an indoor power supply circuit 420, which implements the function of the indoor power supply network unit 302.

[0019] The printed circuit board 203 is provided with a mounting area for mounting a shielding cover, which is used to electromagnetically shield the radio frequency circuits in the short message communication signal forwarding link 106 and / or the positioning signal forwarding link 105.

[0020] This invention also provides a satellite signal forwarding method supporting BeiDou short message communication and positioning. Based on the above embodiments, this invention also provides a satellite signal forwarding system supporting BeiDou short message communication and positioning, comprising: receiving BeiDou satellite positioning signals through an outdoor antenna 102 and transmitting the BeiDou satellite positioning signals to an outdoor interface unit 319 in a relay module 103 via an outdoor radio frequency cable; filtering and amplifying the BeiDou satellite positioning signals through a positioning signal forwarding link 105 in the relay module 103, sequentially via an outdoor power supply network unit 318, a second-level frequency division network unit 314, a downlink radio frequency amplifier 315, a filter input interface unit 316, a cavity filter 202, a filter output interface unit 317, a first-level frequency division network unit 305, an indoor power supply network unit 302, and an indoor interface unit 301, and transmitting the processed BeiDou satellite positioning signals to an indoor antenna 101 via an indoor radio frequency cable; receiving BeiDou short message communication signals from terminal devices through the indoor antenna 101 and transmitting the BeiDou satellite positioning signals to an indoor interface unit 101 via an indoor radio frequency cable. The BeiDou short message communication signal is transmitted to the indoor interface unit 301 in the relay module 103; a detection signal is coupled out from the BeiDou short message communication signal through the coupling network unit 306 in the relay module 103; the detection signal is power-detected by the detector 308 to generate a detection voltage, and the detection voltage is amplified by the follower 309 to improve its driving capability for acquisition by the microcontroller; the microcontroller 310 generates a gain control signal based on the detection voltage, and controls the digitally controlled attenuator 30 based on the gain control signal. The attenuation of 7 is adjusted to regulate the link gain of the short message communication signal forwarding link 106; the uplink RF amplifier 313 amplifies the BeiDou short message communication signal after gain adjustment and filters it through the uplink narrowband filter 416; the processed BeiDou short message communication signal is then transmitted sequentially through the second-level frequency division network unit 314, the outdoor power supply network unit 318, and the outdoor interface unit 319, and then transmitted to the outdoor antenna 102 via the outdoor RF cable; the processed BeiDou short message communication signal is then forwarded to the BeiDou satellite through the outdoor antenna 102. The working principle of this invention is as follows: By setting up independent positioning signal forwarding links and short message communication signal forwarding links within the repeater, the downlink path of BeiDou satellite positioning signals and the uplink path of short message communication signals are physically isolated in terms of radio frequency path, power supply network and filtering devices; After receiving the BeiDou satellite positioning signal through the outdoor antenna, the positioning signal forwarding link feeds the outdoor antenna through the outdoor power supply network unit, the second-level frequency division network unit completes the signal splitting, the downlink RF amplifier performs low-noise amplification, the cavity filter performs frequency selective filtering, the filter output interface unit and the first-level frequency division network unit complete the signal routing, the indoor power supply network unit feeds the indoor antenna, and finally the indoor antenna radiates the positioning signal. The short message communication signal forwarding link receives the BeiDou short message communication signal from the indoor antenna receiving terminal, and then sequentially passes through the indoor interface unit, the indoor power supply network unit, the first-level frequency division network unit for branching, the coupling network unit for coupling the detection signal, the detector and follower to complete power detection and generate a detection voltage (the follower amplifies the detection voltage to improve its driving capability for microcontroller acquisition), the microcontroller acquires the voltage and controls the digitally controlled attenuator to dynamically adjust the link gain, then amplifies it through the uplink RF amplifier, filters out out-of-band interference through the uplink narrowband filter, merges it through the second-level frequency division network unit, and is fed by the outdoor power supply network unit, and finally forwards it to the BeiDou satellite by the outdoor antenna; the cavity filter effectively suppresses the back-coupling of the transmitted signal leaked through the second-level frequency division network unit into the positioning signal forwarding link, improving the isolation between the two links; The shielding cover installation area on the printed circuit board, together with the chassis cover and chassis body, forms an electromagnetic shielding structure. The whole-machine shielding cavity and the PCB-level local shielding work together to ensure that the positioning signal and short message communication signal can be stably forwarded in shielded environments such as indoors, underground, and power tunnels, so as to achieve synchronous and reliable coverage of Beidou short message communication and positioning services.

[0021] In this embodiment, based on the aforementioned system structure and method flow, referring to Figure 5 The test results diagram shown demonstrates the complete functional output of the relay system in an indoor shielded environment. The specific displayed content includes: 501, B1, and B3 band satellite signal carrier-to-noise ratio; 502, S-band satellite signal carrier-to-noise ratio; 503, uplink short message content sent by the terminal device; 504, number of location information received by RDSS (i.e., short message communication signal forwarding link 106); 505, number of location information sent by RDSS (i.e., short message communication signal forwarding link 106); 506, location information of RDSS (i.e., short message communication signal forwarding link 106). 507. Success rate, number of communication messages received by RDSS (i.e., short message communication signal forwarding link 106), 508. Number of communication messages sent by RDSS (i.e., short message communication signal forwarding link 106), 509. Communication success rate of RDSS (i.e., short message communication signal forwarding link 106), 510. Dual-frequency positioning display (i.e., B1+B3 dual-frequency mode supported by positioning signal forwarding link 105), 511. Positioning elevation information, 512. Positioning latitude, 513. Positioning longitude, 514. Number, number and azimuth of received satellites; Test results show that after the relay 200, relay module 103, positioning signal forwarding link 105 and short message communication signal forwarding link 106 work together, the carrier-to-noise ratios (CNR) 501 of the B1 and B3 bands and the CNR 502 of the S band are all much greater than 40 dB indoors. This indicates that the BeiDou satellite positioning signal has excellent signal quality after being filtered by the cavity filter 202, amplified by the downlink RF amplifier 315 with low noise, and fed by the indoor power supply network unit 302, and can effectively complete the positioning. Meanwhile, the RDSS (i.e., short message communication signal forwarding link 106) successfully retrieved 98 out of 100 positioning and communication messages sent, achieving a success rate of 98%, far exceeding the industry standard of 95%. This confirms that the system relies on the coupling network unit 306 to couple and detect signals, the detector 308 and follower 309 to complete power detection, the microcontroller 310 to generate gain control signals, the digitally controlled attenuator 307 to dynamically adjust the link gain, and combined with the uplink narrowband filter 416 to filter out out-of-band interference, the second-level frequency division network unit 314 to merge signals, the outdoor power supply network unit 318 to supply power, and the outdoor antenna 102 to reliably transmit. This achieves stable forwarding of short message communication signals in complex electromagnetic environments, with all 14 indicators outputting normally. This fully verifies the technical effect of the present invention in achieving reliable coverage of BeiDou positioning signals and stable forwarding of short message communication in scenarios where satellite signals are blocked.

Claims

1. A satellite signal forwarding system supporting BeiDou short message communication and positioning, comprising an indoor antenna (101), an outdoor antenna (102), and a repeater (200). The indoor antenna (101) is connected to the repeater (200) via an indoor radio frequency cable, and the outdoor antenna (102) is connected to the repeater (200) via an outdoor radio frequency cable; Its features are, The transceiver (200) is equipped with a transceiver module (103); The repeater (200) is equipped with a repeater module (103), which includes an independent positioning signal forwarding link (105) and a short message communication signal forwarding link (106). The positioning signal forwarding link (105) is configured to receive the Beidou satellite positioning signal input through the outdoor antenna (102), perform filtering and amplification processing in sequence, and output the processed positioning signal to the indoor antenna (101) through the indoor radio frequency cable. The short message communication signal forwarding link (106) is configured to receive the Beidou short message communication signal input through the indoor antenna (101), perform power detection, gain adjustment, filtering and amplification in sequence, and output the processed short message communication signal to the outdoor antenna (102) through the outdoor radio frequency cable.

2. A satellite signal forwarding system supporting BeiDou short message communication and positioning according to claim 1, characterized in that, The relay module (103) includes an indoor interface unit (301), an indoor power supply network unit (302), a power network unit (303), a power interface unit (304), a first-level frequency divider network unit (305), a coupling network unit (306), a digitally controlled attenuator (307), a detector (308), a follower (309), a microcontroller (310), a debugging interface unit (311), a data transmission interface unit (312), an uplink RF amplifier (313), a second-level frequency divider network unit (314), a downlink RF amplifier (315), a filter input interface unit (316), a filter output interface unit (317), an outdoor power supply network unit (318), and an outdoor interface unit (319). The indoor interface unit (301) is connected to the indoor power supply network unit (302); The indoor power supply network unit (302) is connected to the power supply network unit (303) and the first-level frequency division network unit (305) respectively; The first-stage frequency division network unit (305) is connected to the coupling network unit (306) and the filter output interface unit (317), respectively; The coupling network unit (306) is connected to the digitally controlled attenuator (307) and the detector (308) respectively; The numerically controlled attenuator (307) is connected to the microcontroller (310) and the uplink RF amplifier (313) respectively; The detector (308) is connected to the microcontroller (310) via a follower (309). The microcontroller (310) is connected to the debugging interface unit (311) and the data transmission interface unit (312) respectively; The uplink RF amplifier (313) is connected to the second-stage frequency divider network unit (314); The second-level frequency division network unit (314) is connected to the downlink RF amplifier (315) and the outdoor power supply network unit (318), respectively; The outdoor power supply network unit (318) is connected to the power supply network unit (303) and the outdoor interface unit (319) respectively; The downlink RF amplifier (315) is connected to the filter input interface unit (316); The power network unit (303) is connected to the power interface unit (304); Both the filter input interface unit (316) and the filter output interface unit (317) are connected to the cavity filter (202); The short message communication signal forwarding link (106) is configured as follows: via an indoor antenna (101), an indoor radio frequency cable, an indoor interface unit (301), an indoor power supply network unit (302), a first-level frequency division network unit (305), a coupling network unit (306), a digitally controlled attenuator (307), an uplink radio frequency amplifier (313), a second-level frequency division network unit (314), an outdoor power supply network unit (318), an outdoor interface unit (319), and an outdoor radio frequency cable to the outdoor antenna (102); The positioning signal forwarding link (105) is configured as follows: via an outdoor antenna (102), an outdoor radio frequency cable, an outdoor interface unit (319), an outdoor power supply network unit (318), a second-level frequency division network unit (314), a downlink radio frequency amplifier (315), a filter input interface unit (316), a cavity filter (202), a filter output interface unit (317), a first-level frequency division network unit (305), an indoor power supply network unit (302), an indoor interface unit (301), and an indoor radio frequency cable to an indoor antenna (101); The transfer module (103) is located inside the transferor (200), which is a physical device that carries the transfer module (103).

3. A satellite signal forwarding system supporting BeiDou short message communication and positioning according to claim 2, characterized in that, The coupling network unit (306) is configured to couple a detection signal from the short message communication signal; The detector (308) is configured to perform power detection on the detection signal and generate a detection voltage; The follower (309) is configured to amplify the detected voltage to improve its driving capability; The microcontroller (310) is configured to generate a gain control signal based on the detected voltage and control the attenuation of the numerically controlled attenuator (307) based on the gain control signal.

4. A satellite signal forwarding system supporting BeiDou short message communication and positioning according to claim 2, characterized in that, It also includes a power supply module (104); The power supply module (104) includes a power adapter (212) and a power network unit (303). The power adapter (212) is configured to convert external AC power into DC power and input it to the power network unit (303) via the power interface unit (304). The power network unit (303) is configured to perform voltage conversion, filtering and voltage regulation on the DC power to generate a set of working voltages for use by each functional unit in the relay module (103).

5. A satellite signal forwarding system supporting BeiDou short message communication and positioning according to claim 2, characterized in that, The cavity filter (202) is configured to: perform frequency selective filtering on the Beidou satellite positioning signal output by the downlink RF amplifier (315), suppress the transmitted signal leaked through the second-level frequency division network unit (314) in the short message communication signal forwarding link (106), and enter the positioning signal forwarding link (105) through the filter input interface unit (316), cavity filter (202) and filter output interface unit (317).

6. A satellite signal forwarding system supporting BeiDou short message communication and positioning according to claim 2, characterized in that, The repeater (200) includes a chassis cover (201), a chassis body (204), a printed circuit board (203), a chassis panel (205), and a power adapter (212). The chassis (204) is enclosed on one side and has a chassis panel (205) on the other side. The bottom of the chassis (204) is closed, and the top of the chassis is provided with a chassis cover (201). The printed circuit board (203), cavity filter (202), and power adapter (212) are all screwed into the fixing stud holes (211) provided at the bottom of the chassis (204) by bolts; The chassis panel (205) is equipped with: The data transmission interface slot (206) is electrically connected to the data transmission interface unit (312) on the printed circuit board (203) via printed wires; The serial port debugging interface slot (207) is electrically connected to the debugging interface unit (311) on the printed circuit board (203) via printed wires; The first antenna interface slot (208) is electrically connected to the indoor interface unit (301) on the printed circuit board (203) via printed wires; The second antenna interface slot (209) is electrically connected to the outdoor interface unit (319) on the printed circuit board (203) via printed wires; The AC power interface slot (210) is electrically connected to the power interface unit (304) on the printed circuit board (203) via printed wires; The printed circuit board (203) integrates an indoor interface unit (301), an indoor power supply network unit (302), a power supply network unit (303), a first-level frequency divider network unit (305), a coupling network unit (306), a digitally controlled attenuator (307), a detector (308), a follower (309), a microcontroller (310), a debugging interface unit (311), a data transmission interface unit (312), an uplink RF amplifier (313), a second-level frequency divider network unit (314), a downlink RF amplifier (315), an outdoor power supply network unit (318), and an outdoor interface unit (319).

7. A satellite signal forwarding system supporting BeiDou short message communication and positioning according to claim 6, characterized in that, The printed circuit board (203) includes: The serial digital connector (401) on the first board is the functional implementation unit of the debugging interface unit (311); The serial digital connector (402) on the second board is the functional implementation unit of the data transmission interface unit (312); The first radio frequency connector (403) is the functional implementation unit of the indoor interface unit (301); The filter output connector (404) is the functional implementation unit of the filter output interface unit (317); The filter input connector (405) is the functional implementation unit of the filter input interface unit (316); The second radio frequency connector (406) is the functional implementation unit of the outdoor interface unit (319); The integrated circuit chip (407) is the functional implementation unit of the microcontroller (310); The detector chip (408) is the functional implementation unit of the detector (308); The operational amplifier voltage follower chip (409) is the functional implementation unit of the follower (309); The coupler chip (410) is the functional implementation unit of the coupling network unit (306); The numerically controlled attenuation chip (411) is the functional implementation unit of the numerically controlled attenuator (307); The power supply chip (412) on the board is the functional implementation unit of the power network unit (303); The power input port (413) on the board is the functional implementation unit of the power interface unit (304); The outdoor power supply circuit (414) is the functional implementation unit of the outdoor power supply network unit (318); The uplink RF amplifier chip (415) is the functional implementation unit of the uplink RF amplifier (313); The uplink narrowband filter (416) is a functional unit for implementing the filtering function in the short message communication signal forwarding link (106); The outdoor power divider chip (417) is the functional implementation unit of the second-stage frequency divider network unit (314); The downlink RF amplifier chip (418) is the functional implementation unit of the downlink RF amplifier (315); The indoor power divider chip (419) is the functional implementation unit of the first-level frequency divider network unit (305); The indoor power supply circuit (420) is the functional implementation unit of the indoor power supply network unit (302).

8. A satellite signal forwarding system supporting BeiDou short message communication and positioning according to claim 1, characterized in that, The printed circuit board (203) is provided with a mounting area for mounting a shielding cover. The shielding cover is used to electromagnetically shield the radio frequency circuits in the short message communication signal forwarding link (106) and / or the positioning signal forwarding link (105).

9. A satellite signal forwarding method supporting BeiDou short message communication and positioning, implemented based on a satellite signal forwarding system supporting BeiDou short message communication and positioning as described in any one of claims 1-8, characterized in that, Including: The Beidou satellite positioning signal is received through the outdoor antenna (102) and transmitted to the outdoor interface unit (319) in the relay module (103) via the outdoor radio frequency cable. The BeiDou satellite positioning signal is filtered and amplified through the positioning signal forwarding link (105) in the relay module (103), the signal passes through the outdoor power supply network unit (318), the second-level frequency division network unit (314), the downlink RF amplifier (315), the filter input interface unit (316), the cavity filter (202), the filter output interface unit (317), the first-level frequency division network unit (305), the indoor power supply network unit (302), and the indoor interface unit (301). The processed BeiDou satellite positioning signal is then transmitted to the indoor antenna (101) via the indoor RF cable. The Beidou short message communication signal sent by the terminal device is received by the indoor antenna (101), and the Beidou short message communication signal is transmitted to the indoor interface unit (301) in the relay module (103) via the indoor radio frequency cable. The detection signal is coupled out from the Beidou short message communication signal through the coupling network unit (306) in the relay module (103); The detection signal is power detected by the detector (308) to generate a detection voltage, and the detection voltage is amplified by the follower (309) to improve its driving capability so that the microcontroller can acquire it. The microcontroller (310) generates a gain control signal based on the detected voltage, and controls the attenuation of the digitally controlled attenuator (307) based on the gain control signal to adjust the link gain of the short message communication signal forwarding link (106). The Beidou short message communication signal after gain adjustment is amplified by the uplink RF amplifier (313) and filtered by the uplink narrowband filter (416); The processed BeiDou short message communication signal is transmitted to the outdoor antenna (102) via the outdoor radio frequency cable through the second-level frequency division network unit (314), the outdoor power supply network unit (318) and the outdoor interface unit (319). The processed BeiDou short message communication signal is forwarded to the BeiDou satellite via the outdoor antenna (102).

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