Space-based multi-system narrow-band signal parallel processing system and method

Abstract

The invention discloses a space-based multi-system narrow-band signal parallel processing system and method, and relates to the technical field of signal processing, and the system comprises a signal processing single machine which comprises a main control unit, a baseband unit and a radio frequency unit which are connected in sequence; the main control unit can be connected with a measurement and control subsystem and a data transmission subsystem of a satellite, can generate a configuration instruction according to a received remote control instruction, sends the configuration instruction to the baseband unit, and can transmit data sent by the baseband unit to the data transmission subsystem according to a received remote measurement instruction; the baseband unit is used for configuring a working parameter and a working mode according to a configuration instruction sent by the main control unit, and performing modulation and demodulation of a UHF band narrow-band signal and encoding and decoding processing of message information; the radio frequency unit is used for performing power distribution and amplification processing on the radio frequency signal; the deployable circle-aligning flexible antenna is used for receiving and transmitting UHF band narrowband signals. According to the invention, parallel receiving and processing of UHF band narrowband signals can be realized.

Description

Technical Field

[0001] The present invention relates to the field of information processing technologies, and in particular, to a space-based multi-system narrowband signal parallel processing system and method. Background Art

[0002] In the UHF frequency band, narrowband signals are mainly used in emergency communication, satellite search and rescue, Internet of Things, and specific industry communication scenarios. Currently, the main UHF frequency band narrowband signals include: COSPAS-SARSAT (Global Satellite Search and Rescue System) distress beacon signals, Chirp system Internet of Things terminal signals, LoRa system Internet of Things terminal signals, wearable device signals, airborne emergency locator transmitter (ELT) signals, and flight crew survival radio signals, and the signal frequency bands are all in the range of 406 MHz to 425 MHz.

[0003] In order to achieve the transceiver processing of the above UHF frequency band narrowband signals, a variety of space-based narrowband signal processing systems have been developed and proposed. However, the existing space-based narrowband signal processing systems can receive and process a relatively single type of signal system. Generally, they can only receive and process one type of UHF frequency band narrowband signal, and do not have the ability to parallelly access heterogeneous signals transmitted by different ground terminals and complete the on-orbit processing of different protocol messages. Moreover, the existing space-based narrowband signal processing systems basically do not have the functions of spectrum sensing and frequency point switching, and the anti-interference performance is poor. For example, the current space-based narrowband signal processing system for the LoRa system can only complete the on-orbit modulation and demodulation of the LoRa system Internet of Things terminal signals, cannot realize the on-orbit modulation and demodulation of other types of UHF frequency band narrowband signals, and does not have the functions of spectrum sensing and frequency point switching, and the anti-interference performance is insufficient.

[0004] Currently, the UHF-band spaceborne antennas used in space-based narrowband signal processing systems mainly include microstrip antennas, dipole antennas and their deformed antennas, helical antennas, Yagi antennas, etc. Among them, although the microstrip antenna has the natural characteristics of a low profile, is easy to achieve conformal design, has a flexible feeding method, and is easy to integrate and design with the backend RF equipment, its quality factor (Q value) is relatively high, resulting in a narrow working bandwidth, and the front-to-back ratio is relatively low. After the overall satellite layout, the radiation characteristics are easily affected by the electromagnetic environment loading around the satellite body, resulting in a significant deterioration in performance. Although the helical antenna can achieve excellent wide-beam and wide-angle circular polarization radiation characteristics, and when a resonant four-arm helix design is adopted, the antenna size can be further reduced to achieve miniaturization design, the axial height is still relatively high, making it difficult to meet the layout requirements under the limited space of the overall satellite. Dipole antennas and their deformed antennas, such as classic dipoles, monopoles, biconical antennas, and magnetic current loops, have omnidirectional radiation patterns by themselves. However, since the excitation is distributed on the symmetry axis, it hinders the distribution of the feeding network, making it difficult to arrange and form an array. Moreover, the antenna size is relatively large in the low-frequency band, and it is difficult to miniaturize. In addition, the radiation pattern is linear polarization, which cannot meet the requirements of spaceborne wide-angle circular polarization radiation. Although the Yagi antenna can easily achieve linear polarization or circular polarization working modes and has the characteristics of high-gain directional beam radiation, the beam width is relatively narrow, making it difficult to meet the requirements of wide-angle circular polarization radiation.

[0005] In addition, the existing key structures inside space-based narrowband signal processing systems usually adopt aluminum plate design to meet the electromagnetic protection and heat dissipation requirements of aerospace. However, this design method is prone to problems such as large space density and redundant structural design. Summary of the Invention

[0006] To solve some or all of the above technical problems existing in the prior art, the present invention provides a space-based multi-system narrowband signal parallel processing system and method.

[0007] The technical solution of the present invention is as follows: In a first aspect, a space-based multi-system narrowband signal parallel processing system is provided, and the system includes: A signal processing single machine, including a main control unit, a baseband unit, and a radio frequency unit connected in sequence; An interface is provided on the main control unit. The main control unit can be connected to the satellite's TT&C subsystem and data transmission subsystem through the interface. The main control unit can receive and parse the telecommand and / or telemetry command sent by the TT&C subsystem, can generate a configuration command according to the telecommand, and send the configuration command to the baseband unit, and can transmit the data sent by the baseband unit to the data transmission subsystem according to the telemetry command; The baseband unit is configured to receive and store the program code sent by the master control unit, configure the working parameters and working modes according to the configuration instructions sent by the master control unit, perform modulation of UHF-band narrowband signals and encoding processing of message information based on the configured working parameters and working modes, obtain the corresponding radio frequency signals and send them to the radio frequency unit, and perform demodulation of UHF-band narrowband signals and decoding processing of message information to obtain the corresponding parsed data and send them to the master control unit; The radio frequency unit is also connected to the deployable circumferential flexible antenna. The radio frequency unit is configured to perform power distribution and amplification processing on the received radio frequency signals and then send them to the baseband unit or the deployable circumferential flexible antenna; The deployable circumferential flexible antenna adopts a symmetric circumferential radiation design and is configured to receive and transmit UHF-band narrowband signals.

[0008] Further, in an alternative embodiment of the present invention, the radio frequency unit includes: an LC filter, a circulator, a limiter, a first low-noise amplifier, a first surface acoustic wave filter, a second low-noise amplifier, a second surface acoustic wave filter, a first fixed attenuator, a first gain amplifier, a second fixed attenuator, a third surface acoustic wave filter, a second gain amplifier, a fourth surface acoustic wave filter, a third fixed attenuator, a drive amplifier, a fourth fixed attenuator, and a power amplifier; The LC filter is bidirectionally connected to the deployable circumferential flexible antenna and the circulator. One output end of the circulator is connected to the input end of the limiter. The limiter, the first low-noise amplifier, the first surface acoustic wave filter, the second low-noise amplifier, the second surface acoustic wave filter, the first fixed attenuator, and the first gain amplifier are connected in sequence. The output end of the first gain amplifier is connected to the baseband unit. The LC filter, the circulator, the limiter, the first low-noise amplifier, the first surface acoustic wave filter, the second low-noise amplifier, the second surface acoustic wave filter, the first fixed attenuator, and the first gain amplifier form a receiving link; The input end of the second fixed attenuator is connected to the baseband unit. The second fixed attenuator, the third surface acoustic wave filter, the second gain amplifier, the fourth surface acoustic wave filter, the third fixed attenuator, the drive amplifier, the fourth fixed attenuator, and the power amplifier are connected in sequence. The output end of the power amplifier is connected to one input end of the circulator. The second fixed attenuator, the third surface acoustic wave filter, the second gain amplifier, the fourth surface acoustic wave filter, the third fixed attenuator, the drive amplifier, the fourth fixed attenuator, the power amplifier, the circulator, and the LC filter form a transmitting link.

[0009] Further, in an alternative embodiment of the present invention, the baseband unit includes: a main control FPGA, a slave control FPGA, a configuration FPGA, a splitter, a splitter group, a Chirp modulation and demodulation chip, a LoRa modulation and demodulation chip, a first radio frequency transceiver, a second radio frequency transceiver, a third radio frequency transceiver, a combiner, and a memory; The main control FPGA and the slave control FPGA are respectively connected to the main control unit through bidirectional asynchronous serial ports, the configuration FPGA is connected to the main control unit through a bidirectional synchronous serial port, the main control FPGA and the slave control FPGA are connected, the configuration FPGA is respectively connected to the main control FPGA and the slave control FPGA, the main control FPGA and the configuration FPGA are respectively connected with memories, the input end of the splitter is connected to the radio frequency unit, the output ends of the splitter are respectively connected to the input ends of the splitter group, the input end of the first radio frequency transceiver, and the input end of the second radio frequency transceiver, the output ends of the splitter group are respectively connected to the slave control FPGA through a plurality of the Chirp modulation and demodulation chips and a plurality of the LoRa modulation and demodulation chips, the output ends of the first radio frequency transceiver and the second radio frequency transceiver are respectively connected to the main control FPGA, the main control FPGA is further connected to the input end of the third radio frequency transceiver, the output end of the third radio frequency transceiver is connected to the input end of the combiner, the input end of the combiner is further connected to the slave control FPGA through a LoRa modulation and demodulation chip, and the output end of the combiner is connected to the radio frequency unit.

[0010] Further, in an alternative embodiment of the present invention, the baseband unit further includes a watchdog, the watchdog is connected to the configuration FPGA, and the watchdog is used to monitor the operating states of the main control FPGA and the slave control FPGA, and trigger the configuration FPGA when the operating states are abnormal, so that the configuration FPGA controls the main control FPGA and the slave control FPGA to be reset.

[0011] Further, in an alternative embodiment of the present invention, the main control unit includes: a main processing controller, a standby processing controller, a crystal oscillator, a memory, an interface chip, and a power supply module; The main processing controller and the standby processing controller are respectively connected to the baseband unit, the main processing controller and the standby processing controller are respectively connected with the crystal oscillator, the main processing controller and the standby processing controller are respectively connected with the memory, the main processing controller and the standby processing controller are respectively connected with the interface chip, the interface chip can be connected to the TT&C subsystem and / or the data transmission subsystem of the satellite, and the power supply module can be connected to an external power supply.

[0012] Further, in an alternative embodiment of the present invention, it further includes a protective housing, the signal processing unit is installed in the protective housing, and a power interface, a data interface and a radio frequency interface are provided on the protective housing. The power interface is used to connect to an external power supply, the data interface is used to connect to the TT&C subsystem and the data transmission subsystem of the satellite, and the radio frequency interface is used to connect to the deployable circumferential flexible antenna.

[0013] Further, in an alternative embodiment of the present invention, the deployable circumferential flexible antenna includes: an antenna support, an element arm limiting mechanism, an elastic member, a multi-functional feeding central shaft body, a feeding cable, a low-frequency flexible element, an intermediate-frequency flexible element, a high-frequency flexible element, a pressing rope and a rope breaker; The element arm limiting mechanism is provided on the antenna support. One end of the elastic member is installed on the antenna support, and the other end is connected to the multi-functional feeding central shaft body. The elastic member can drive the multi-functional feeding central shaft body to swing. The feeding cable is provided on the multi-functional feeding central shaft body, and the feeding cable extends along the axial direction of the multi-functional feeding central shaft body. One end of the low-frequency flexible element is fixed on the multi-functional feeding central shaft body, and the low-frequency flexible element can be wound around the multi-functional feeding central shaft body along the circumferential direction of the multi-functional feeding central shaft body. One end of the intermediate-frequency flexible element is fixed on the multi-functional feeding central shaft body, and the intermediate-frequency flexible element can be wound around the multi-functional feeding central shaft body along the circumferential direction of the multi-functional feeding central shaft body. One end of the high-frequency flexible element is fixed on the multi-functional feeding central shaft body, and the high-frequency flexible element can be wound around the multi-functional feeding central shaft body along the circumferential direction of the multi-functional feeding central shaft body. The low-frequency flexible element, the intermediate-frequency flexible element and the high-frequency flexible element are distributed at intervals along the axial direction of the multi-functional feeding central shaft body. The pressing rope is detachably provided on the antenna support, and the pressing rope can press the multi-functional feeding central shaft body on the antenna support. The rope breaker is installed on the antenna support, and the rope breaker can disconnect the pressing rope after being activated. When the multi-functional feeding central shaft body is pressed on the antenna support by the pressing rope, the elastic member is in a bent and compressed state, and the element arm limiting mechanism provided on the antenna support is in contact and cooperation with the low-frequency flexible element, the intermediate-frequency flexible element and the high-frequency flexible element wound on the multi-functional feeding central shaft body respectively.

[0014] Further, in an alternative embodiment of the present invention, the UHF band narrowband signal includes one or more of: COSPAS-SARSAT distress beacon signal, Chirp-based IoT terminal signal, LoRa-based IoT terminal signal, wearable device signal, airborne emergency locator transmitter signal, and flight crew survival radio signal.

[0015] In a second aspect, a space-based multi-system narrowband signal parallel processing method using the above space-based multi-system narrowband signal parallel processing system is also provided, including: The main control unit is used to parse the remote control instruction, generate corresponding configuration instructions according to the parsing result and send them to the baseband unit, so that the baseband unit configures the working parameters and working modes according to the configuration instructions; Based on the configured working parameters and working modes, the baseband unit is used to parse and process the UHF-band narrowband signal sent by the radio frequency unit, and send the parsed data to the main control unit; Based on the configured working parameters and working modes, the baseband unit is used to receive and modulate the data sent by the main control unit, generate a radio frequency signal and send it to the radio frequency unit, and the radio frequency unit and the deployable omnidirectional flexible antenna are used to broadcast the radio frequency signal outward.

[0016] Further, in an optional embodiment of the present invention, the working modes include: receiving mode, broadcasting mode and spectrum sensing mode.

[0017] The main advantages of the technical solution of the present invention are as follows: The space-based multi-system narrowband signal parallel processing system and method of the present invention can realize the parallel reception and processing of various UHF-band narrowband signals by setting the main control unit to update and configure the operating program code of the baseband unit and adjust and configure the working parameters and working modes of the baseband unit; at the same time, using the deployable omnidirectional flexible antenna as the transceiver antenna can greatly reduce the antenna size while meeting the performance requirements, so as to facilitate the miniaturized design of the space-based multi-system narrowband signal parallel processing system. Description of the Drawings

[0018] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a structural block diagram of a space-based multi-system narrowband signal parallel processing system provided by an embodiment of the present invention; Figure 2 It is a structural block diagram of the radio frequency unit in a signal processing single machine provided by an embodiment of the present invention, and the baseband unit is also shown therein; Figure 3 It is a structural block diagram of the baseband unit in a signal processing single machine provided by an embodiment of the present invention, and the radio frequency unit and the main control unit are also shown therein; Figure 4 It is a structural block diagram of the main control unit in a signal processing single machine provided by an embodiment of the present invention, and the baseband unit is also shown therein; Figure 5Schematic diagram of the structure of a protective housing provided by an embodiment of the present invention; Figure 6 Schematic diagram of the structure of a deployable omnidirectional flexible antenna in the retracted state provided by an embodiment of the present invention; Figure 7 Schematic diagram of the structure of a deployable omnidirectional flexible antenna in the deployed state provided by an embodiment of the present invention; Figure 8 Schematic flow chart of a space - based multi - system narrow - band signal parallel processing method provided by an embodiment of the present invention.

[0019] Description of reference numerals: 1 - Antenna support, 2 - Dipole arm limiting mechanism, 3 - Elastic member, 4 - Multifunctional feeding central shaft body, 5 - Feeding cable, 6 - Low - frequency flexible dipole, 7 - Medium - frequency flexible dipole, 8 - High - frequency flexible dipole, 9 - Tightening rope, 10 - Rope breaker. Detailed implementation manners

[0020] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] The following will detail the technical solutions provided by the embodiments of the present invention with reference to the drawings.

[0022] Refer to Figure 1 , in the first aspect, an embodiment of the present invention provides a space - based multi - system narrow - band signal parallel processing system, which includes: A signal processing single machine, including a main control unit, a baseband unit and a radio frequency unit connected in sequence; An interface is provided on the main control unit. The main control unit can be connected to the satellite's TT&C subsystem and data transmission subsystem through the interface. The main control unit can receive and parse the telecommand and / or telemetry command sent by the TT&C subsystem, can generate a configuration command according to the telecommand, and send the configuration command to the baseband unit, and can transmit the data sent by the baseband unit to the data transmission subsystem according to the telemetry command; The baseband unit is used to receive and store the program code sent by the main control unit, configure the working parameters and working modes according to the configuration command sent by the main control unit, perform modulation of UHF - band narrow - band signals and encoding processing of message information based on the configured working parameters and working modes, obtain the corresponding radio frequency signals and send them to the radio frequency unit, and perform demodulation of UHF - band narrow - band signals and decoding processing of message information, obtain the corresponding parsed data and send it to the main control unit; The radio frequency unit is also connected to the deployable circumferential flexible antenna. The radio frequency unit is used to perform power distribution and amplification processing on the received radio frequency signals and then send them to the baseband unit or the deployable circumferential flexible antenna. The deployable circumferential flexible antenna adopts a symmetric circumferential radiation design and is used to receive and transmit UHF band narrowband signals.

[0023] Specifically, when the space-based multi-system narrowband signal parallel processing system provided by the embodiments of the present invention is in use, the space-based multi-system narrowband signal parallel processing system is carried on a satellite platform. The main control unit is respectively connected to the satellite's TT&C subsystem and data transmission subsystem through interfaces, so that the main control unit can receive telemetry commands, remote control commands, and related data sent by the TT&C subsystem, and so that the main control unit can perform data interaction with the data transmission subsystem. When the main control unit receives a remote control command sent by the TT&C subsystem, the main control unit parses the remote control command, generates corresponding configuration commands according to the parsing result and sends them to the baseband unit. The baseband unit configures its own working parameters and working modes according to the configuration commands sent by the main control unit, and completes signal processing based on the configured working parameters and working modes. When it is necessary to send a signal to the outside world, the main control unit sends the data to be sent to the baseband unit. The baseband unit performs signal modulation and message information encoding processing on the received data based on the configured working parameters and working modes, obtains the corresponding radio frequency signal and sends it to the radio frequency unit. The radio frequency unit performs power distribution and amplification processing on the received radio frequency signal and then sends it to the deployable circumferential flexible antenna, so that the deployable circumferential flexible antenna broadcasts the radio frequency signal to the outside. When it is necessary to receive an external signal, the deployable circumferential flexible antenna senses and receives a certain type or various types of UHF band narrowband signals from the outside in real time, and sends the received UHF band narrowband signals to the radio frequency unit. The radio frequency unit performs power distribution and amplification processing on the received radio frequency signal and then sends it to the baseband unit. The baseband unit performs signal demodulation and message information decoding processing on the received radio frequency signal based on the configured working parameters and working modes, obtains the corresponding parsed data and sends it to the main control unit. The main control unit stores the received parsed data. When the main control unit receives a telemetry command sent by the TT&C subsystem, the main control unit parses the telemetry command and transmits the corresponding data obtained according to the parsing result to the data transmission subsystem.

[0024] Among them, the main control unit can also receive and store the program code sent by the satellite's TT&C subsystem or data transmission subsystem, and can send the program code to the baseband unit according to the remote control command sent by the TT&C subsystem. The program code can be uploaded from the ground end to the satellite.

[0025] Among them, the data to be sent can be the data already stored in the main control unit, or the data pre-sent by the data transmission subsystem to the main control unit, which is determined according to actual needs.

[0026] Among them, the UHF-band narrowband signals include: COSPAS-SARSAT distress beacon signals, IoT terminal signals with Chirp system, IoT terminal signals with LoRa system, wearable device signals, airborne emergency locator transmitter signals, and flight crew survival radio signals.

[0027] The space-based multi-system narrowband signal parallel processing system provided by the embodiments of the present invention can realize the parallel reception and processing of various UHF-band narrowband signals by setting a main control unit to update and configure the operating program code of the baseband unit and adjust and configure the working parameters and working modes of the baseband unit. At the same time, by using a deployable circumferential flexible antenna as the transceiver antenna, the antenna size can be greatly reduced while meeting the performance requirements, so as to facilitate the miniaturized design of the space-based multi-system narrowband signal parallel processing system.

[0028] Reference Figure 2 , further, in the embodiments of the present invention, in order to implement the functions of the above radio frequency unit, the radio frequency unit includes: an LC filter, a circulator, a limiter, a first low-noise amplifier, a first surface acoustic wave filter, a second low-noise amplifier, a second surface acoustic wave filter, a first fixed attenuator, a first gain amplifier, a second fixed attenuator, a third surface acoustic wave filter, a second gain amplifier, a fourth surface acoustic wave filter, a third fixed attenuator, a drive amplifier, a fourth fixed attenuator, and a power amplifier; The LC filter is bidirectionally connected to the deployable circumferential flexible antenna and the circulator respectively. One output end of the circulator is connected to the input end of the limiter. The limiter, the first low-noise amplifier, the first surface acoustic wave filter, the second low-noise amplifier, the second surface acoustic wave filter, the first fixed attenuator, and the first gain amplifier are connected in sequence. The output end of the first gain amplifier is connected to the baseband unit. The LC filter, the circulator, the limiter, the first low-noise amplifier, the first surface acoustic wave filter, the second low-noise amplifier, the second surface acoustic wave filter, the first fixed attenuator, and the first gain amplifier form a receiving link; The input end of the second fixed attenuator is connected to the baseband unit. The second fixed attenuator, the third surface acoustic wave filter, the second gain amplifier, the fourth surface acoustic wave filter, the third fixed attenuator, the drive amplifier, the fourth fixed attenuator, and the power amplifier are connected in sequence. The output end of the power amplifier is connected to one input end of the circulator. The second fixed attenuator, the third surface acoustic wave filter, the second gain amplifier, the fourth surface acoustic wave filter, the third fixed attenuator, the drive amplifier, the fourth fixed attenuator, the power amplifier, the circulator, and the LC filter form a transmitting link.

[0029] In the embodiments of the present invention, the LC filter is used to suppress harmonics and improve the signal spectrum purity; the circulator is used to couple the transmitting channel and the receiving channel to merge the transmitting and receiving channels for facilitating signal transmission and reception processing; the limiter is used to release strong signals exceeding the set threshold to limit the received signal within a certain range to ensure that subsequent amplifiers are not damaged; the low-noise amplifier is used to amplify the received signal; the surface acoustic wave filter is used to suppress out-of-band interference signals; the fixed attenuator is used to adjust the signal power based on the set attenuation value; the gain amplifier is used to increase the signal power to meet the total gain requirement; the driver amplifier is used to provide an initial gain to provide sufficient drive level for the power amplifier; the power amplifier is used to amplify the power of the transmitted signal.

[0030] In the embodiments of the present invention, the LC filter can be selected as BL-415.5 / H19-5CS; the circulator can be selected as CSP406-425M10A; the limiter can be selected as SKY16602-632LF; the low-noise amplifier can be selected as SPF5043Z; the surface acoustic wave filter can be selected as TA1119A; the gain amplifier can be selected as NBB-500; the driver amplifier can be selected as TQP3M9035; the power amplifier can be selected as RFPA3800.

[0031] In the embodiments of the present invention, by using the above-defined radio frequency unit, power distribution of the transmitted and received signals, multi-stage low-noise amplification of the received signal, and power amplification of the transmitted signal can be achieved. Specifically, the received signal in the frequency band of 406 MHz to 425 MHz can be amplified to ensure that the channel gain is greater than 50 dB, the noise figure is less than 3 dB, and the standing wave is less than 2; the transmitted signal in the frequency band of 406 MHz to 425 MHz can be amplified in power to ensure that the transmitted power is greater than 3 W.

[0032] In the radio frequency unit provided by the embodiments of the present invention, by adopting two-stage low-noise amplifiers and two-stage surface acoustic wave filters in the receiving link, high gain, low noise, and high signal-to-noise ratio can be ensured; by setting fixed attenuators at different positions in the receiving link and the transmitting link to adjust the signal power, the requirements of receiving sensitivity and transmitting efficiency can be adapted; by setting a circulator for coupling and isolation of the transmitting channel and the receiving channel, signal transmission and reception processing can be facilitated and interference between the received signal and the transmitted signal can be avoided; by setting a limiter and a fixed attenuator, overload can be prevented from damaging the devices in the radio frequency unit.

[0033] Reference Figure 3, Further, in the embodiments of the present invention, in order to implement the functions of the above baseband unit, the baseband unit includes: a master FPGA (Field Programmable Gate Array), a slave FPGA, a configuration FPGA, a splitter, a splitter group, a Chirp modulation and demodulation chip, a LoRa modulation and demodulation chip, a first radio frequency transceiver, a second radio frequency transceiver, a third radio frequency transceiver, a combiner, and a memory; The master FPGA and the slave FPGA are respectively connected to the master unit through bidirectional asynchronous serial ports, the configuration FPGA is connected to the master unit through a bidirectional synchronous serial port, the master FPGA and the slave FPGA are connected, the configuration FPGA is respectively connected to the master FPGA and the slave FPGA, the master FPGA and the configuration FPGA are respectively connected with memories, the input end of the splitter is connected to the radio frequency unit, the output ends of the splitter are respectively connected to the input ends of the splitter group, the input end of the first radio frequency transceiver, and the input end of the second radio frequency transceiver, the output ends of the splitter group are respectively connected to the slave FPGA through a plurality of Chirp modulation and demodulation chips and a plurality of LoRa modulation and demodulation chips, the output ends of the first radio frequency transceiver and the second radio frequency transceiver are respectively connected to the master FPGA, the master FPGA is further connected to the input end of the third radio frequency transceiver, the output end of the third radio frequency transceiver is connected to the input end of the combiner, the input end of the combiner is further connected to the slave FPGA through a LoRa modulation and demodulation chip, and the output end of the combiner is connected to the radio frequency unit.

[0034] Among them, in the appendix Figure 3 , the output ends of the splitter group are respectively connected to the slave FPGA through two Chirp modulation and demodulation chips and 14 LoRa modulation and demodulation chips.

[0035] It should be noted that in the case where the radio frequency unit and the baseband unit adopt the above specific structures, the first gain amplifier of the radio frequency unit is connected to the splitter of the baseband unit, and the second fixed attenuator of the radio frequency unit is connected to the combiner of the baseband unit.

[0036] In an embodiment of the present invention, a splitter is used to split the radio frequency signals sent by a radio frequency unit, so as to distribute the radio frequency signals to a splitter group, a first radio frequency transceiver, and a second radio frequency transceiver; the splitter group is used to split the received radio frequency signals, so as to distribute the radio frequency signals to a plurality of Chirp modulation and demodulation chips and a plurality of LoRa modulation and demodulation chips connected thereto; a slave control FPGA performs parallel demodulation of Chirp system signals through a plurality of Chirp modulation and demodulation chips, and performs parallel demodulation of LoRa system signals through a plurality of LoRa modulation and demodulation chips; the first radio frequency transceiver and the second radio frequency transceiver are used to convert the received radio frequency signals into baseband signals; a master control FPGA demodulates the baseband signals output by the first radio frequency transceiver according to a preconfigured working mode, completes the parsing process of COSPAS-SARSAT distress beacon signals, obtains corresponding message information, or performs Fourier transform (FFT) processing on the baseband signals output by the first radio frequency transceiver to obtain low-noise spectrum parameters; the master control FPGA also demodulates the baseband signals output by the second radio frequency transceiver, completes the parsing process of Chirp system signals or LoRa system signals, and obtains corresponding message information; the master control FPGA is also used to generate baseband signals according to a given instruction and send them to a third radio frequency transceiver; the third radio frequency transceiver is used to convert the received baseband signals into radio frequency signals and send them to a combiner; the slave control FPGA is also used to generate LoRa system signals by using LoRa modulation and demodulation chips according to a given instruction and send them to the combiner; the combiner is used to combine the signals from different channels into a single signal stream and send them to the radio frequency unit; the configuration FPGA is used to perform in-orbit reconfiguration of the programs of the master control FPGA and the slave control FPGA, and is used to monitor whether particle inversion occurs in the master control FPGA and the slave control FPGA, and control the master control FPGA and the slave control FPGA to reload program codes when particle inversion occurs.

[0037] Further, in an embodiment of the present invention, in the above baseband unit, the memory includes at least one of a programmable read-only memory (PROM), a ferroelectric random access memory (FRAM), and a flash memory to meet different storage requirements.

[0038] Wherein, in an embodiment of the present invention, the configuration FPGA is respectively connected to a programmable read-only memory, a ferroelectric random access memory, and a flash memory, and the master control FPGA is connected to a ferroelectric random access memory to meet actual usage requirements.

[0039] Further, in an embodiment of the present invention, in order to facilitate monitoring the operating states of the master control FPGA and the slave control FPGA, the baseband unit further includes a watchdog, which is connected to the configuration FPGA, used to monitor the operating states of the master control FPGA and the slave control FPGA, and trigger the configuration FPGA when the operating states are abnormal, so that the configuration FPGA controls the master control FPGA and the slave control FPGA to reset.

[0040] In an embodiment of the present invention, the master FPGA can be selected as XC7VX690T, the slave FPGA can be selected as XC7A35T, the configuration FPGA can be selected as XC7A35T, the Chirp modulation and demodulation chip can be selected as JTM1100, the LoRa modulation and demodulation chip can be selected as Lora1278, the radio frequency transceiver can be selected as AD9361, and the flash memory can be selected as a four-channel SPI NOR flash memory.

[0041] In the embodiment of the present invention, by using the above-defined baseband unit, the modulation and demodulation of various UHF-band narrowband signals and the encoding and decoding processing of message information can be realized. At the same time, the core device code can be effectively protected to ensure the stable operation of the baseband unit.

[0042] Reference Figure 4 , further, in the embodiment of the present invention, in order to implement the functions of the above master unit, the master unit includes: a main processing controller, a backup processing controller, a crystal oscillator, a memory, an interface chip, and a power module; The main processing controller and the backup processing controller are respectively connected to the baseband unit. The main processing controller and the backup processing controller are respectively connected to a crystal oscillator. The main processing controller and the backup processing controller are respectively connected to a memory. The main processing controller and the backup processing controller are respectively connected to an interface chip. The interface chip can be connected to the TT&C subsystem and / or the data transmission subsystem of the satellite. The power module can be connected to an external power source.

[0043] It should be noted that when the baseband unit and the master unit adopt the above-defined specific structures, the main processing controller and the backup processing controller of the master unit are respectively connected to the configuration FPGA of the baseband unit through a bidirectional synchronous serial port, the main processing controller and the backup processing controller of the master unit are respectively connected to the master FPGA of the baseband unit through a bidirectional asynchronous serial port, and the main processing controller and the backup processing controller of the master unit are respectively connected to the slave FPGA of the baseband unit through a bidirectional asynchronous serial port.

[0044] In the embodiment of the present invention, the master unit is used to implement the following functions: connect to an external power source through the power module to complete the conversion from primary power to secondary power to realize the power supply of the signal processing single machine; connect to the TT&C subsystem and the data transmission subsystem of the satellite platform through the interface chip to receive and execute the remote control instructions and telemetry instructions sent by the TT&C subsystem, and transmit the stored data to the data transmission subsystem; receive the demodulated data sent by the baseband unit through a bidirectional asynchronous serial port and store it in the memory; send a telemetry instruction to the baseband unit through a bidirectional asynchronous serial port to obtain the telemetry data of the baseband unit; send the reconstructed program code to the baseband unit through a bidirectional synchronous serial port.

[0045] In an embodiment of the present invention, the main processing controller and the standby processing controller form a redundant design. When the main processing controller encounters an abnormality or a fault, the standby processing controller is put into use to ensure the stable operation of the main control unit.

[0046] In an embodiment of the present invention, the crystal oscillator is used to provide a stable and accurate clock signal.

[0047] Further, in an embodiment of the present invention, in the above-mentioned main control unit, the memory includes at least one of a programmable read-only memory, a ferroelectric random access memory, and a flash memory to meet the storage requirements.

[0048] Among them, in an embodiment of the present invention, in the above-mentioned main control unit, the memory includes a ferroelectric random access memory and a flash memory. Both the main processing controller and the standby processing controller are respectively connected to the ferroelectric random access memory and the flash memory to meet the actual different task requirements.

[0049] Further, in an embodiment of the present invention, the interface chip includes a CAN interface chip and an LVDS interface chip. The main processing controller and the standby processing controller can be connected to the measurement and control sub-system through the CAN interface chip, and the main processing controller and the standby processing controller can be connected to the data transmission sub-system through the LVDS interface chip.

[0050] By providing the CAN interface chip and the LVDS interface chip respectively for the connection between the measurement and control sub-system and the main control unit and the connection between the data transmission sub-system and the main control unit, the efficiency and accuracy of instruction and data transmission can be improved.

[0051] Reference Figure 4 , further, in an embodiment of the present invention, the main control unit further includes a watchdog, which is respectively connected to the main processing controller and the standby processing controller, and is used to monitor the operating states of the main processing controller and the standby processing controller, and trigger the main processing controller and the standby processing controller when the operating states are abnormal, so that the main processing controller and the standby processing controller are reset.

[0052] In an embodiment of the present invention, the main processing controller and the standby processing controller can select M2S090.

[0053] Reference Figure 5, Further, in the embodiment of the present invention, to facilitate the assembly and use of the space-based multi-system narrowband signal parallel processing system, ensure the safety of the system during use, and meet the electromagnetic protection requirements and heat dissipation performance requirements of the signal processing single machines within the system, the space-based multi-system narrowband signal parallel processing system further includes a protective housing. The signal processing single machines are installed in the protective housing, and the protective housing is provided with a power interface, a data interface, and a radio frequency interface. The power interface is used to connect to an external power supply, the data interface is used to connect to the measurement and control subsystem and the data transmission subsystem of the satellite platform, and the radio frequency interface is used to connect to a deployable flexible antenna for the surrounding area.

[0054] Further, in the embodiment of the present invention, the protective housing is made of lattice metamaterial, produced and prepared based on the additive manufacturing process, and adopts a two-way structure design with high stiffness and low mass to ensure that the mechanical structure of the protective housing can meet the multi-objective requirements of vibration resistance, heat dissipation, and lightweight under the premise of satisfying the electromagnetic shielding function. At the same time, the protective housing also adopts a multi-level structure design of porous material micro-topology to achieve the suppression and dissipation of stress waves at specific frequencies.

[0055] Designed and produced the protective housing based on the above method. Compared with the conventional protective housing, the obtained protective housing can achieve a 15% lightweight design under the premise of ensuring the high stiffness of the overall structure and the requirements of the protection performance, and can realize the lightweight, vibration isolation, and heat dissipation integrated design of the signal processing single machines.

[0056] Reference Figures 6-7 , Further, in the embodiment of the present invention, the deployable flexible antenna for the surrounding area includes: antenna support 1, dipole arm limiting mechanism 2, elastic member 3, multi-functional feeding central shaft body 4, feeding cable 5, low-frequency flexible dipole 6, intermediate-frequency flexible dipole 7, high-frequency flexible dipole 8, pressing rope 9, and rope break detector 10; An antenna support 1 is provided with an element arm limiting mechanism 2. One end of an elastic member 3 is mounted on the antenna support 1, and the other end is connected to a multi-functional feeding central shaft body 4. The elastic member 3 can drive the multi-functional feeding central shaft body 4 to swing. A feeding cable 5 is arranged on the multi-functional feeding central shaft body 4, and the feeding cable 5 extends along the axial direction of the multi-functional feeding central shaft body 4. One end of a low-frequency flexible element 6 is fixed on the multi-functional feeding central shaft body 4, and the low-frequency flexible element 6 can be wound around the multi-functional feeding central shaft body 4 along the circumferential direction of the multi-functional feeding central shaft body 4. One end of a medium-frequency flexible element 7 is fixed on the multi-functional feeding central shaft body 4, and the medium-frequency flexible element 7 can be wound around the multi-functional feeding central shaft body 4 along the circumferential direction of the multi-functional feeding central shaft body 4. One end of a high-frequency flexible element 8 is fixed on the multi-functional feeding central shaft body 4, and the high-frequency flexible element 8 can be wound around the multi-functional feeding central shaft body 4 along the circumferential direction of the multi-functional feeding central shaft body 4. The low-frequency flexible element 6, the medium-frequency flexible element 7, and the high-frequency flexible element 8 are distributed at intervals along the axial direction of the multi-functional feeding central shaft body 4. A pressing rope 9 is detachably arranged on the antenna support 1, and the pressing rope 9 can press the multi-functional feeding central shaft body 4 on the antenna support 1. A rope breaker 10 is mounted on the antenna support 1, and after the rope breaker 10 is started, it can disconnect the pressing rope 9. When the multi-functional feeding central shaft body 4 is pressed on the antenna support 1 by the pressing rope 9, the elastic member 3 is in a bent and compressed state, and the element arm limiting mechanism 2 arranged on the antenna support 1 is in contact and cooperation with the low-frequency flexible element 6, the medium-frequency flexible element 7, and the high-frequency flexible element 8 wound on the multi-functional feeding central shaft body 4.

[0057] In the embodiment of the present invention, based on the structure of the deployable circumferential flexible antenna defined above, the deployable circumferential flexible antenna has two states: a storage state and a deployed state. When the deployable circumferential flexible antenna is in the storage state, the multi-functional feeding central shaft body 4 is pressed on the antenna support 1 under the action of the pressing rope 9, and the low-frequency flexible element 6, the medium-frequency flexible element 7, and the high-frequency flexible element 8 are always wound on the multi-functional feeding central shaft body 4 under the action of the element arm limiting mechanism 2; when the deployable circumferential flexible antenna needs to be deployed, the rope breaker 10 is started to disconnect the pressing rope 9, and the multi-functional feeding central shaft body 4 swings upward under the drive of the elastic member 3. During the upward swing of the multi-functional feeding central shaft body 4, the high-frequency flexible element 8, the medium-frequency flexible element 7, and the low-frequency flexible element 6 fixed and wound on the multi-functional feeding central shaft body 4 are sequentially separated from the element arm limiting mechanism 2, so as to be sequentially deployed and released, completing the deployment of the element arm.

[0058] The deployable circumferential flexible antenna provided by the embodiment of the present invention can achieve high deployment and storage ratio storage before launch, can achieve automatic deployment after entering the orbit, and can reduce the space required for antenna arrangement.

[0059] In the deployable circumferential flexible antenna provided by the embodiment of the present invention, the low-frequency flexible dipole 6 includes two mutually orthogonal groups, the intermediate-frequency flexible dipole 7 includes two mutually orthogonal groups, and the high-frequency flexible dipole 8 includes two mutually orthogonal groups. The multi-functional feeding central shaft body 4 is used to realize the excitation feeding conduction and structural support functions of the two groups of orthogonal flexible dipoles, to provide high stiffness support during antenna storage, to ensure the deformation and recovery control of the antenna radiation structure, to absorb stress and acceleration shocks during the antenna deployment and release process, to ensure the integrity of the antenna, and to realize high stiffness and high reliability support after the antenna is deployed and locked, so as to ensure that the high-frequency guided wave simultaneously satisfies the following performances: low-loss conduction with high amplitude-phase consistency; efficient energy conversion into space electromagnetic wave radiation.

[0060] In the deployable circumferential flexible antenna provided by the embodiment of the present invention, by respectively exciting the high-frequency flexible dipole 8, the intermediate-frequency flexible dipole 7, and the low-frequency flexible dipole 6, it is possible to realize the equal-amplitude superposition of the differential phases of the spatial fields and achieve the final high-purity circular polarization radiation.

[0061] Reference Figures 6-7 , further, in the embodiment of the present invention, there are two rope breakers 10, and the two rope breakers 10 are respectively installed on the antenna support 1 and are located on both sides of the multi-functional feeding central shaft body 4.

[0062] By setting two rope breakers 10, it is possible to ensure that the pressing rope 9 is completely disconnected and ensure that the deployable circumferential flexible antenna can be deployed smoothly.

[0063] Further, in the embodiment of the present invention, the rope breaker 10 is an unlocking hot knife, and after the unlocking hot knife is started, it can melt the pressing rope 9.

[0064] Further, in the embodiment of the present invention, the dipole arm limiting mechanism 2 is a limiting support installed on the antenna support 1. By using the limiting support, when the multi-functional feeding central shaft body 4 is pressed on the antenna support 1, the low-frequency flexible dipole 6, the intermediate-frequency flexible dipole 7, and the high-frequency flexible dipole 8 can be limited to ensure that the flexible dipoles are always wound around the multi-functional feeding central shaft body 4.

[0065] Further, in the deployable circumferential flexible antenna provided by the embodiment of the present invention, for the convenience of disassembly and assembly of the antenna, the antenna support 1 is provided with a threaded interface, and the antenna support 1 is detachably installed on the satellite platform through the threaded interface.

[0066] Further, in the embodiments of the present invention, based on the above-defined deployable omnidirectional flexible antenna, corresponding simulation tests are carried out on its structure, and the corresponding simulation results of the low-frequency radiation pattern, the intermediate-frequency radiation pattern, and the high-frequency radiation pattern are obtained. Among them, in the simulation result of the low-frequency radiation pattern, the antenna gain is about 5.98 dB, the 3 dB beam width is about 100°, the gain at the 60° beam edge is about 1.1 dB, the front-to-back ratio is about 51 dB, and the radiation characteristics of each section have excellent rotational symmetry characteristics. In the simulation result of the intermediate-frequency radiation pattern, the antenna gain is about 6.1 dB, the 3 dB beam width is about 100°, the gain at the 60° beam edge is about 1.26 dB, the front-to-back ratio is about 54 dB, and the radiation characteristics of each section have excellent rotational symmetry characteristics. In the simulation result of the high-frequency radiation pattern, the antenna gain is about 6.3 dB, the 3 dB beam width is about 105°, the gain at the 60° beam edge is about 1.46 dB, the front-to-back ratio is about 59 dB, and the radiation characteristics of each section have excellent rotational symmetry characteristics.

[0067] It can be seen that the deployable omnidirectional flexible antenna provided by the embodiments of the present invention maintains a quasi-constant radiation characteristic within the working frequency band and can realize the broadband design of the radiation pattern.

[0068] Reference Figure 8 Second, the embodiments of the present invention further provide a space-based multi-system narrowband signal parallel processing method. This method is applied to the above-mentioned space-based multi-system narrowband signal parallel processing system and includes the following steps: The main control unit is used to parse the remote control command, generate corresponding configuration commands according to the parsing result, and send them to the baseband unit, so that the baseband unit configures the working parameters and working modes according to the configuration commands; Based on the configured working parameters and working modes, the baseband unit is used to parse and process the UHF-band narrowband signal sent by the radio frequency unit, and send the parsed data to the main control unit; Based on the configured working parameters and working modes, the baseband unit is used to receive and modulate the data sent by the main control unit, generate a radio frequency signal and send it to the radio frequency unit, and the radio frequency unit and the deployable omnidirectional flexible antenna are used to broadcast the radio frequency signal outward.

[0069] Furthermore, in the embodiments of the present invention, the working modes include: receiving mode, broadcasting mode, and spectrum sensing mode. Specifically, when the space-based multi-system narrowband signal parallel processing system enters the receiving mode, the space-based multi-system narrowband signal parallel processing system widely and parallelly receives various UHF-band narrowband signals, encapsulates the parsed messages in a predefined frame format, and transmits the parsed data to the data transmission subsystem of the satellite when receiving the data transmission instruction. When the space-based multi-system narrowband signal parallel processing system enters the broadcasting mode, the space-based multi-system narrowband signal parallel processing system generates a radio frequency signal according to actual requirements and broadcasts it externally. After the broadcast is completed, it automatically switches to the receiving mode. When the space-based multi-system narrowband signal parallel processing system enters the spectrum sensing mode, the space-based multi-system narrowband signal parallel processing system performs frequency scanning and sensing on the 406 - 425 MHz frequency band, parses the sensed signals in real time to obtain messages, encapsulates the parsed messages in a predefined frame format, and transmits the parsed data to the data transmission subsystem of the satellite when receiving the data transmission instruction.

[0070] The space-based multi-system narrowband signal parallel processing method provided by the embodiments of the present invention can realize the parallel reception and processing of various UHF-band narrowband signals by setting a main control unit to update and configure the operating program code of the baseband unit, and to adjust and configure the working parameters and working modes of the baseband unit.

[0071] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. In addition, "front", "rear", "left", "right", "upper", and "lower" in this article are all referenced based on the placement state shown in the drawings.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A space-based multi-system narrowband signal parallel processing system, characterized in that The system includes: A single signal processing unit, including a main control unit, a baseband unit, and a radio frequency unit connected in sequence; An interface is provided on the main control unit. The main control unit can be connected to the TT&C subsystem and the data transmission subsystem of the satellite through the interface. The main control unit can receive and parse the telecommand and / or telemetry command sent by the TT&C subsystem, generate a configuration command according to the telecommand, and send the configuration command to the baseband unit, and can transmit the data sent by the baseband unit to the data transmission subsystem according to the telemetry command; The baseband unit is used to receive and store the program code sent by the main control unit, configure the working parameters and working modes according to the configuration command sent by the main control unit, perform modulation of UHF-band narrowband signals and encoding processing of message information based on the configured working parameters and working modes, obtain the corresponding radio frequency signals and send them to the radio frequency unit, and perform demodulation of UHF-band narrowband signals and decoding processing of message information to obtain the corresponding parsed data and send it to the main control unit; The radio frequency unit is also connected to a deployable circumferential flexible antenna. The radio frequency unit is used to perform power distribution and amplification processing on the received radio frequency signals and then send them to the baseband unit or the deployable circumferential flexible antenna; The deployable circumferential flexible antenna adopts a symmetric circumferential radiation design and is used to receive and transmit UHF-band narrowband signals.

2. The space-based multi-system narrowband signal parallel processing system according to claim 1, wherein The radio frequency unit includes: an LC filter, a circulator, a limiter, a first low-noise amplifier, a first surface acoustic wave filter, a second low-noise amplifier, a second surface acoustic wave filter, a first fixed attenuator, a first gain amplifier, a second fixed attenuator, a third surface acoustic wave filter, a second gain amplifier, a fourth surface acoustic wave filter, a third fixed attenuator, a drive amplifier, a fourth fixed attenuator, and a power amplifier; The LC filter is bidirectionally connected to the deployable circumferential flexible antenna and the circulator respectively. One output end of the circulator is connected to the input end of the limiter. The limiter, the first low-noise amplifier, the first surface acoustic wave filter, the second low-noise amplifier, the second surface acoustic wave filter, the first fixed attenuator, and the first gain amplifier are connected in sequence. The output end of the first gain amplifier is connected to the baseband unit. The LC filter, the circulator, the limiter, the first low-noise amplifier, the first surface acoustic wave filter, the second low-noise amplifier, the second surface acoustic wave filter, the first fixed attenuator, and the first gain amplifier form a receiving link; The input end of the second fixed attenuator is connected to the baseband unit. The second fixed attenuator, the third surface acoustic wave filter, the second gain amplifier, the fourth surface acoustic wave filter, the third fixed attenuator, the drive amplifier, the fourth fixed attenuator, and the power amplifier are connected in sequence. The output end of the power amplifier is connected to one input end of the circulator. The second fixed attenuator, the third surface acoustic wave filter, the second gain amplifier, the fourth surface acoustic wave filter, the third fixed attenuator, the drive amplifier, the fourth fixed attenuator, the power amplifier, the circulator, and the LC filter form a transmitting link.

3. The space-based multi-system narrowband signal parallel processing system according to claim 1, characterized in that The baseband unit includes: a main control FPGA, a slave control FPGA, a configuration FPGA, a splitter, a splitter group, a Chirp modulation and demodulation chip, a LoRa modulation and demodulation chip, a first radio frequency transceiver, a second radio frequency transceiver, a third radio frequency transceiver, a combiner, and a memory; The main control FPGA and the slave control FPGA are respectively connected to the main control unit through bidirectional asynchronous serial ports. The configuration FPGA is connected to the main control unit through a bidirectional synchronous serial port. The main control FPGA and the slave control FPGA are connected. The configuration FPGA is respectively connected to the main control FPGA and the slave control FPGA. The main control FPGA and the configuration FPGA are respectively connected with memories. The input end of the splitter is connected to the radio frequency unit. The output end of the splitter is respectively connected to the input ends of the splitter group, the first radio frequency transceiver, and the second radio frequency transceiver. The output ends of the splitter group are respectively connected to the slave control FPGA through a plurality of the Chirp modulation and demodulation chips and a plurality of the LoRa modulation and demodulation chips. The output ends of the first radio frequency transceiver and the second radio frequency transceiver are respectively connected to the main control FPGA. The main control FPGA is further connected to the input end of the third radio frequency transceiver. The output end of the third radio frequency transceiver is connected to the input end of the combiner. The input end of the combiner is further connected to the slave control FPGA through a LoRa modulation and demodulation chip. The output end of the combiner is connected to the radio frequency unit.

4. The space-based multi-system narrowband signal parallel processing system according to claim 3, wherein The baseband unit further includes a watchdog, which is connected to the configuration FPGA. The watchdog is used to monitor the operating states of the main control FPGA and the slave control FPGA, and trigger the configuration FPGA when the operating states are abnormal, so that the configuration FPGA controls the main control FPGA and the slave control FPGA to be reset.

5. The space-based multi-system narrowband signal parallel processing system according to claim 1, wherein The main control unit includes: a main processing controller, a standby processing controller, a crystal oscillator, a memory, an interface chip, and a power supply module; The main processing controller and the standby processing controller are respectively connected to the baseband unit. The main processing controller and the standby processing controller are respectively connected with the crystal oscillator, the main processing controller and the standby processing controller are respectively connected with the memory, the main processing controller and the standby processing controller are respectively connected with the interface chip. The interface chip can be connected to the TT&C subsystem and / or the data transmission subsystem of the satellite, and the power supply module can be connected to an external power supply.

6. The space-based multi-system narrowband signal parallel processing system according to claim 1, characterized in that It further includes a protective housing. The signal processing single unit is installed in the protective housing. The protective housing is provided with a power interface, a data interface and a radio frequency interface. The power interface is used to connect to an external power supply, the data interface is used to connect to the TT&C subsystem and the data transmission subsystem of the satellite, and the radio frequency interface is used to connect to the deployable circumferential flexible antenna.

7. The space-based multi-system narrowband signal parallel processing system according to claim 1, wherein The deployable circumferential flexible antenna includes: an antenna support, an element arm limiting mechanism, an elastic member, a multi-functional feeding central shaft body, a feeding cable, a low-frequency flexible element, an intermediate-frequency flexible element, a high-frequency flexible element, a pressing rope and a rope breaker; The element arm limiting mechanism is arranged on the antenna support. One end of the elastic member is installed on the antenna support, and the other end is connected to the multi-functional feeding central shaft body. The elastic member can drive the multi-functional feeding central shaft body to swing. The feeding cable is arranged on the multi-functional feeding central shaft body, and the feeding cable extends along the axial direction of the multi-functional feeding central shaft body. One end of the low-frequency flexible element is fixed on the multi-functional feeding central shaft body, and the low-frequency flexible element can be wound around the multi-functional feeding central shaft body along the circumferential direction of the multi-functional feeding central shaft body. One end of the intermediate-frequency flexible element is fixed on the multi-functional feeding central shaft body, and the intermediate-frequency flexible element can be wound around the multi-functional feeding central shaft body along the circumferential direction of the multi-functional feeding central shaft body. One end of the high-frequency flexible element is fixed on the multi-functional feeding central shaft body, and the high-frequency flexible element can be wound around the multi-functional feeding central shaft body along the circumferential direction of the multi-functional feeding central shaft body. The low-frequency flexible element, the intermediate-frequency flexible element and the high-frequency flexible element are arranged at intervals along the axial direction of the multi-functional feeding central shaft body. The pressing rope is detachably arranged on the antenna support, and the pressing rope can press the multi-functional feeding central shaft body on the antenna support. The rope breaker is installed on the antenna support, and after the rope breaker is activated, it can disconnect the pressing rope. When the multi-functional feeding central shaft body is pressed on the antenna support by the pressing rope, the elastic member is in a bent and compressed state, and the element arm limiting mechanism arranged on the antenna support is respectively in contact and cooperation with the low-frequency flexible element, the intermediate-frequency flexible element and the high-frequency flexible element wound on the multi-functional feeding central shaft body.

8. The space-based multi-system narrowband signal parallel processing system according to claim 1, wherein The UHF-band narrowband signals include one or more of the following: COSPAS-SARSAT distress beacon signals, IoT terminal signals with Chirp system, IoT terminal signals with LoRa system, wearable device signals, airborne emergency locator transmitter signals, and flight crew survival radio signals.

9. A space-based multi-system narrowband signal parallel processing method applying the space-based multi-system narrowband signal parallel processing system according to any one of claims 1-8, characterized in that, The method includes: Using the main control unit to parse the remote control instructions, generating corresponding configuration instructions according to the parsing results and sending them to the baseband unit, so that the baseband unit configures the working parameters and working modes according to the configuration instructions; Based on the configured working parameters and working modes, using the baseband unit to parse and process the UHF-band narrowband signals sent by the radio frequency unit, and sending the parsed data to the main control unit; Based on the configured working parameters and working modes, using the baseband unit to receive and modulate the data sent by the main control unit, generating a radio frequency signal and sending it to the radio frequency unit, and using the radio frequency unit and the deployable omnidirectional flexible antenna to broadcast the radio frequency signal outward.

10. The space-based multi-system narrowband signal parallel processing method according to claim 9, characterized in that, The working modes include: receiving mode, broadcasting mode, and spectrum sensing mode.

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