Space-based multi-body system narrowband signal parallel processing system and method

Abstract

The application discloses a kind of space-based multi-system narrowband signal parallel processing system and method, it is related to signal processing technical field, including: signal processing single computer, including sequentially connected main control unit, baseband unit and radio frequency unit;Main control unit can be connected with satellite's measurement and control subsystem and data transmission subsystem, main control unit can generate configuration instruction according to received remote control instruction, and configuration instruction is sent to baseband unit, can according to received telemetry instruction data transmission sent by baseband unit is transmitted to data transmission subsystem;Baseband unit is configured working parameter and working mode according to the configuration instruction sent by main control unit, carries out UHF frequency band narrowband signal modulation and demodulation and message information encoding and decoding processing;Radio frequency unit is used for power distribution and amplification processing to radio frequency signal;Deployable flexible antenna is used for receiving and transmitting UHF frequency band narrowband signal.The application can realize parallel receiving and processing of UHF frequency band narrowband signal.

Description

Technical Field

[0001] This invention relates to the field of information processing technology, and in particular to a space-based multi-system narrowband signal parallel processing system and method. Background Technology

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

[0003] To achieve the aforementioned UHF band narrowband signal transmission and reception processing, various space-based narrowband signal processing systems have been developed and proposed. However, existing space-based narrowband signal processing systems can only receive and process a limited range of signal types, generally only one type of UHF band narrowband signal. They lack the ability to simultaneously access heterogeneous signals transmitted by different ground terminals, or to complete on-orbit processing of different protocol messages. Furthermore, existing space-based narrowband signal processing systems generally lack spectrum sensing and frequency switching capabilities, resulting in poor anti-interference performance. For example, current space-based narrowband signal processing systems for LoRa can only perform on-orbit modulation and demodulation of LoRa IoT terminal signals, and cannot perform on-orbit modulation and demodulation of other types of UHF band narrowband signals. They also lack spectrum sensing and frequency switching capabilities, leading to insufficient anti-interference performance.

[0004] Currently, UHF band satellite antennas used in space-based narrowband signal processing systems mainly include microstrip antennas, array antennas and their variations, helical antennas, and Yagi antennas. While microstrip antennas naturally have a low profile, making conformal design easy, and offering flexible feeding methods, they are also easily integrated with backend RF equipment. However, their high quality factor (Q value) results in a narrow operating bandwidth, and their low front-to-back ratio makes their radiation characteristics susceptible to the electromagnetic environment surrounding the satellite, leading to significant performance degradation. Helical antennas, while achieving excellent wide-beam and wide-angle circular polarization radiation characteristics, and with a resonant four-arm helical design, can further reduce antenna size for miniaturization, still have a relatively high axial height, making it difficult to meet the layout requirements under space constraints. Array antennas and their variations, such as classic dipoles, monopoles, biconical antennas, and magnetic flux loops, exhibit omnidirectional radiation patterns. However, the excitation distribution along the axis of symmetry hinders the distribution of the feed network, making them difficult to arrange and form arrays. Furthermore, their large size at low frequencies makes miniaturization challenging, and their linearly polarized radiation mode cannot meet the requirements for wide-angle circular polarization radiation in spaceborne applications. While Yagi antennas can easily achieve linear or circular polarization operation and feature high-gain directional beam radiation, their narrow beamwidth makes it difficult to meet the wide-angle circular polarization radiation requirements.

[0005] In addition, the key internal structures of existing space-based narrowband signal processing systems typically use aluminum plates to meet the electromagnetic protection and heat dissipation requirements of aerospace. However, this design is prone to problems such as high space density and redundant structural design. Summary of the Invention

[0006] To address some or all of the 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:

[0008] Firstly, a space-based multi-mode narrowband signal parallel processing system is provided, the system comprising:

[0009] A signal processing unit, comprising a main control unit, a baseband unit, and a radio frequency unit connected in sequence;

[0010] The main control unit is equipped with an interface, which enables it to connect to the satellite's telemetry, tracking, command and control subsystem and data transmission subsystem. The main control unit can receive and parse remote control commands and / or telemetry commands sent by the telemetry, tracking, and command subsystem, generate configuration commands based on the remote control commands, and send the configuration commands to the baseband unit. It can also transmit data sent by the baseband unit to the data transmission subsystem based on the telemetry commands.

[0011] The baseband unit is used to receive and store the program code sent by the main control unit, configure the working parameters and working mode according to the configuration instructions sent by the main control unit, perform modulation of UHF band narrowband signals and encoding of message information based on the configured working parameters and working mode, obtain the corresponding radio frequency signal and send it to the radio frequency unit, and perform demodulation of UHF band narrowband signals and decoding of message information, obtain the corresponding parsed data and send it to the main control unit.

[0012] 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 signal and then send it to the baseband unit or the deployable circumferential flexible antenna.

[0013] The deployable circumferential flexible antenna employs a symmetrical circumferential radiation design and is used to receive and transmit narrowband UHF signals.

[0014] Further, in an optional 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 (SAW) filter, a second low-noise amplifier, a second SAW filter, a first fixed attenuator, a first gain amplifier, a second fixed attenuator, a third SAW filter, a second gain amplifier, a fourth SAW filter, a third fixed attenuator, a driver amplifier, a fourth fixed attenuator, and a power amplifier.

[0015] The LC filter is bidirectionally transmitted to the deployable circular flexible antenna and the circulator, respectively. One output terminal of the circulator is connected to the input terminal of the limiter. The limiter, the first low-noise amplifier, the first surface acoustic wave (SAW) filter, the second low-noise amplifier, the second SAW filter, the first fixed attenuator, and the first gain amplifier are connected in sequence. The output terminal 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 SAW filter, the second low-noise amplifier, the second SAW filter, the first fixed attenuator, and the first gain amplifier form a receiving link.

[0016] The input terminal of the second fixed attenuator is connected to the baseband unit. The second fixed attenuator, the third surface acoustic wave (SAW) filter, the second gain amplifier, the fourth SAW filter, the third fixed attenuator, the driver amplifier, the fourth fixed attenuator, and the power amplifier are connected in sequence. The output terminal of the power amplifier is connected to one input terminal of the circulator. The second fixed attenuator, the third SAW filter, the second gain amplifier, the fourth SAW filter, the third fixed attenuator, the driver amplifier, the fourth fixed attenuator, the power amplifier, the circulator, and the LC filter form a transmit link.

[0017] Furthermore, in an optional embodiment of the present invention, the baseband unit includes: a master control FPGA, a slave control FPGA, a configuration FPGA, a splitter, a splitter group, a Chirp modem chip, a LoRa modem chip, a first radio frequency transceiver, a second radio frequency transceiver, a third radio frequency transceiver, a combiner, and a memory.

[0018] The master control FPGA and the slave control FPGA are respectively connected to the master control unit via bidirectional asynchronous serial ports. The configuration FPGA is connected to the master control unit via a bidirectional synchronous serial port. The master control FPGA and the slave control FPGA are connected. The configuration FPGA is connected to both the master control FPGA and the slave control FPGA. The master control FPGA and the configuration FPGA are each connected to a memory. The input of the splitter is connected to the RF unit. The output of the splitter is connected to the input of the splitter group, the input of the first RF transceiver, and the input of the second RF transceiver. The output of the splitter group is connected to the slave control FPGA via multiple Chirp modem chips and multiple LoRa modem chips. The outputs of the first RF transceiver and the second RF transceiver are respectively connected to the master control FPGA. The master control FPGA is also connected to the input of the third RF transceiver. The output of the third RF transceiver is connected to the input of the combiner. The input of the combiner is also connected to the slave control FPGA via a LoRa modem chip. The output of the combiner is connected to the RF unit.

[0019] Furthermore, in an optional embodiment of the present invention, the baseband unit further includes a watchdog timer connected to the configuration FPGA. The watchdog timer is used to monitor the operating status of the master FPGA and the slave FPGA, and triggers the configuration FPGA when the operating status is abnormal, so that the configuration FPGA controls the master FPGA and the slave FPGA to reset.

[0020] Furthermore, in an optional embodiment of the present invention, the main control unit includes: a main processing controller, a backup processing controller, a crystal oscillator, a memory, an interface chip, and a power module;

[0021] 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 the crystal oscillator. The main processing controller and the backup processing controller are respectively connected to the memory. The main processing controller and the backup processing controller are respectively connected to the interface chip. The interface chip can be connected to the satellite's telemetry and control subsystem and / or data transmission subsystem. The power module can be connected to an external power supply.

[0022] Furthermore, in an optional embodiment of the present invention, a protective housing is also included, the signal processing unit is installed inside 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 source, the data interface is used to connect to the satellite's telemetry and control subsystem and the data transmission subsystem, and the radio frequency interface is used to connect to the deployable circular flexible antenna.

[0023] Furthermore, in an optional embodiment of the present invention, the deployable circular flexible antenna includes: an antenna support, a sub-arm limiting mechanism, an elastic element, a multi-functional feed center shaft, a feed cable, a low-frequency flexible sub-array, a medium-frequency flexible sub-array, a high-frequency flexible sub-array, a clamping rope, and a rope cutter.

[0024] The antenna support is equipped with the array arm limiting mechanism. One end of the elastic element is mounted on the antenna support, and the other end is connected to the multi-functional feed center shaft. The elastic element can drive the multi-functional feed center shaft to swing. The feed cable is provided on the multi-functional feed center shaft, and the feed cable extends along the axial direction of the multi-functional feed center shaft. One end of the low-frequency flexible array is fixed on the multi-functional feed center shaft, and the low-frequency flexible array can be wound around the multi-functional feed center shaft circumferentially. One end of the intermediate-frequency flexible array is fixed on the multi-functional feed center shaft, and the intermediate-frequency flexible array can be wound around the multi-functional feed center shaft circumferentially. One end of the high-frequency flexible array is fixed on the multi-functional feed center shaft. The high-frequency flexible array can be wound around the multi-functional feed center axis circumferentially. The low-frequency flexible array, the mid-frequency flexible array, and the high-frequency flexible array are distributed axially at intervals along the multi-functional feed center axis. The clamping rope is detachably mounted on the antenna support. The clamping rope can press the multi-functional feed center axis onto the antenna support. The rope cutter is mounted on the antenna support. After the rope cutter is activated, it can disconnect the clamping rope. When the multi-functional feed center axis is pressed onto the antenna support by the clamping rope, the elastic element is in a bent and compressed state. The array arm limiting mechanism provided on the antenna support respectively contacts and cooperates with the low-frequency flexible array, the mid-frequency flexible array, and the high-frequency flexible array wound on the multi-functional feed center axis.

[0025] Furthermore, in an optional embodiment of the present invention, the UHF band narrowband signal includes one or more of the following: COSPAS-SARSAT distress beacon signal, Chirp IoT terminal signal, LoRa IoT terminal signal, wearable device signal, airborne emergency positioning transmitter signal, and flight crew life-saving radio signal.

[0026] Secondly, a space-based multi-system narrowband signal parallel processing method applying the above-mentioned space-based multi-system narrowband signal parallel processing system is also provided, including:

[0027] The main control unit parses the remote control commands, generates corresponding configuration commands based on the parsing results, and sends them to the baseband unit so that the baseband unit can configure the working parameters and working mode according to the configuration commands.

[0028] Based on the configured operating parameters and operating mode, the baseband unit analyzes and processes the UHF band narrowband signal transmitted by the radio frequency unit, and sends the analyzed data to the main control unit.

[0029] Based on the configured operating parameters and operating mode, the baseband unit receives and modulates the data sent by the main control unit, generates radio frequency signals and sends them to the radio frequency unit, and then uses the radio frequency unit and the deployable circular flexible antenna to broadcast the radio frequency signals outward.

[0030] Furthermore, in an optional embodiment of the present invention, the operating modes include: a receiving mode, a broadcast mode, and a spectrum sensing mode.

[0031] The main advantages of the technical solution of this invention are as follows:

[0032] The space-based multi-mode 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 a main control unit to update and configure the running 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 periodic flexible antenna as the transceiver antenna, the antenna size can be greatly reduced while meeting performance requirements, so as to realize the miniaturization design of the space-based multi-mode narrowband signal parallel processing system. Attached Figure Description

[0033] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and constitute a part of this invention, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0034] Figure 1 A structural block diagram of a space-based multi-system narrowband signal parallel processing system provided in an embodiment of the present invention;

[0035] Figure 2 A structural block diagram of a radio frequency unit in a signal processing unit provided in an embodiment of the present invention is shown, wherein a baseband unit is also shown;

[0036] Figure 3 A structural block diagram of a baseband unit in a signal processing unit provided in an embodiment of the present invention is also shown, wherein a radio frequency unit and a main control unit are also shown;

[0037] Figure 4 The present invention provides a structural block diagram of a main control unit in a signal processing unit, wherein a baseband unit is also shown.

[0038] Figure 5 This is a schematic diagram of the structure of a protective shell provided in an embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the structure of a deployable periodic flexible antenna in its stowed state, provided by an embodiment of the present invention.

[0040] Figure 7This is a schematic diagram of the structure of a deployable periodic flexible antenna in its deployed state, provided by an embodiment of the present invention.

[0041] Figure 8 This is a flowchart illustrating a space-based multi-system narrowband signal parallel processing method provided in an embodiment of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1-Antenna support, 2-Array arm limiting mechanism, 3-Elastic element, 4-Multi-functional feed center shaft, 5-Feed cable, 6-Low-frequency flexible array, 7-Medium-frequency flexible array, 8-High-frequency flexible array, 9-Pressure rope, 10-Rope cutter. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0045] The technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0046] refer to Figure 1 In a first aspect, embodiments of the present invention provide a space-based multi-system narrowband signal parallel processing system, the system comprising:

[0047] A signal processing unit, comprising a main control unit, a baseband unit, and a radio frequency unit connected in sequence;

[0048] The main control unit is equipped with an interface that allows it to connect to the satellite's telemetry, tracking, command and control (TT&C) subsystem and data transmission subsystem. The main control unit can receive and parse remote control commands and / or telemetry commands sent by the TT&C subsystem, generate configuration commands based on the remote control commands, and send the configuration commands to the baseband unit. It can also transmit data sent by the baseband unit to the data transmission subsystem based on the telemetry commands.

[0049] The baseband unit is used to receive and store the program code sent by the main control unit, configure the working parameters and working mode according to the configuration instructions sent by the main control unit, perform modulation of UHF band narrowband signals and encoding of message information based on the configured working parameters and working mode, obtain the corresponding radio frequency signals and send them to the radio frequency unit, and perform demodulation of UHF band narrowband signals and decoding of message information, obtain the corresponding parsed data and send it to the main control unit.

[0050] 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 signal before sending it to the baseband unit or the deployable circumferential flexible antenna.

[0051] This deployable circumferential flexible antenna features a symmetrical circumferential radiation design and is used for receiving and transmitting narrowband UHF signals.

[0052] Specifically, the space-based multi-system narrowband signal parallel processing system provided in this embodiment of the invention is mounted on a satellite platform. The main control unit is connected to the satellite's telemetry, tracking, and command (TT&C) subsystem and data transmission subsystem via interfaces. This allows the main control unit to receive telemetry commands, remote control commands, and related data sent by the TT&C subsystem, and to interact with the data transmission subsystem. When the main control unit receives a remote control command from the TT&C subsystem, it parses the command, generates a corresponding configuration command based on the parsing result, and sends it to the baseband unit. The baseband unit configures its own operating parameters and operating mode according to the configuration command sent by the main control unit, and completes signal processing based on the configured parameters and mode. When a signal needs to be transmitted to the outside world, the main control unit sends the data to be transmitted to the baseband unit. Based on the configured operating parameters and mode, the baseband unit modulates the received data and encodes the message information, obtaining the corresponding radio frequency (RF) signal and sending it to the RF unit. The RF unit then performs power distribution and amplification on the received RF signal before sending it to the deployable circumferential flexible antenna, enabling the antenna to broadcast the RF signal. When a signal needs to be received from the outside world, the deployable circumferential flexible antenna senses and receives one or more types of UHF band narrowband signals in real time and sends the received UHF band narrowband signals to the RF unit. The RF unit performs power distribution and amplification on the received RF signal before sending it to the baseband unit. Based on the configured operating parameters and mode, the baseband unit demodulates the received RF signal and decodes the message information, obtaining the corresponding parsed data and sending it to the main control unit. The main control unit stores the received parsed data. When the main control unit receives the telemetry command sent by the measurement and control subsystem, the main control unit parses the telemetry command and transmits the corresponding data to the data transmission subsystem based on the parsing result.

[0053] The main control unit can also receive and store program codes sent by the satellite's telemetry, tracking, command and control (TT&C) subsystem or data transmission subsystem, and can send the program codes to the baseband unit according to the remote control commands sent by the TT&C subsystem. The program codes can be uploaded to the satellite from the ground station.

[0054] The data to be sent can be data already stored in the main control unit, or data pre-sent to the main control unit by the data transmission subsystem, depending on actual needs.

[0055] Among them, the UHF band narrowband signals include: COSPAS-SARSAT distress beacon signals, Chirp IoT terminal signals, LoRa IoT terminal signals, wearable device signals, airborne emergency positioning transmitter signals, and flight crew life-saving radio signals.

[0056] The space-based multi-mode narrowband signal parallel processing system provided in this embodiment of the 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 running 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 periodic flexible antenna as the transceiver antenna, the antenna size can be greatly reduced while meeting performance requirements, so as to realize the miniaturized design of the space-based multi-mode narrowband signal parallel processing system.

[0057] refer to Figure 2 Furthermore, in this embodiment of the invention, in order to realize the function of the above-mentioned 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 (SAW) filter, a second low noise amplifier, a second SAW filter, a first fixed attenuator, a first gain amplifier, a second fixed attenuator, a third SAW filter, a second gain amplifier, a fourth SAW filter, a third fixed attenuator, a driver amplifier, a fourth fixed attenuator, and a power amplifier.

[0058] The LC filter is bidirectionally transmitted to the deployable circular flexible antenna and the circulator. One output of the circulator is connected to the input of the limiter. The limiter, the first low-noise amplifier, the first surface acoustic wave (SAW) filter, the second low-noise amplifier, the second SAW filter, the first fixed attenuator, and the first gain amplifier are connected in sequence. The output 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 SAW filter, the second low-noise amplifier, the second SAW filter, the first fixed attenuator, and the first gain amplifier form a receiving link.

[0059] The input of the second fixed attenuator is connected to the baseband unit. The second fixed attenuator, the third surface acoustic wave (SAW) filter, the second gain amplifier, the fourth SAW filter, the third fixed attenuator, the driver amplifier, the fourth fixed attenuator, and the power amplifier are connected in sequence. The output of the power amplifier is connected to one input of the circulator. The second fixed attenuator, the third SAW filter, the second gain amplifier, the fourth SAW filter, the third fixed attenuator, the driver amplifier, the fourth fixed attenuator, the power amplifier, the circulator, and the LC filter form the transmission link.

[0060] In this embodiment of the invention, an LC filter is used to suppress harmonics and improve the purity of the signal spectrum; a circulator is used to couple the transmitting and receiving channels, merging the transmitting and receiving channels to facilitate signal transmission and reception processing; a limiter is used to release strong signals exceeding a set threshold, limiting the received signal to a certain range and ensuring that subsequent amplifiers are not damaged; a low-noise amplifier is used to amplify the received signal; a surface acoustic wave (SAW) filter is used to suppress out-of-band interference signals; a fixed attenuator is used to adjust the signal power based on a set attenuation value; a gain amplifier is used to increase the signal power to meet the overall gain requirement; a driver amplifier is used to provide initial gain, providing sufficient drive level for the power amplifier; and a power amplifier is used to amplify the transmitted signal.

[0061] In this embodiment of the invention, the LC filter can be BL-415.5 / H19-5CS; the circulator can be CSP406-425M10A; the limiter can be SKY16602-632LF; the low noise amplifier can be SPF5043Z; the surface acoustic wave filter can be TA1119A; the gain amplifier can be NBB-500; the driver amplifier can be TQP3M9035; and the power amplifier can be RFPA3800.

[0062] In this embodiment of the invention, the aforementioned defined radio frequency unit enables power allocation for transmitted and received signals, multi-stage low-noise amplification of received signals, and power amplification of transmitted signals. Specifically, it can amplify received signals in the 406MHz~425MHz frequency band, ensuring a channel gain greater than 50dB, a noise figure less than 3dB, and a standing wave ratio less than 2; it can also amplify transmitted signals in the 406MHz~425MHz frequency band, ensuring a transmit power greater than 3W.

[0063] In the radio frequency unit provided by this invention, high gain, low noise, and high signal-to-noise ratio can be ensured by employing two stages of low-noise amplifiers and two stages of surface acoustic wave filters in the receiving link; fixed attenuators are set at different locations in the receiving and transmitting links to adjust the signal power, which can adapt to the requirements of receiving sensitivity and transmitting efficiency; a circulator is set to couple and isolate the transmitting and receiving channels, which can facilitate signal transmission and reception processing and avoid mutual interference between the received and transmitted signals; and a limiter and fixed attenuators are set to prevent overload and damage to the devices in the radio frequency unit.

[0064] refer to Figure 3Furthermore, in this embodiment of the invention, in order to realize the function of the baseband unit, the baseband unit includes: a master control FPGA (Field Programmable Gate Array), a slave control FPGA, a configuration FPGA, a splitter, a splitter group, a Chirp modem chip, a LoRa modem chip, a first radio frequency transceiver, a second radio frequency transceiver, a third radio frequency transceiver, a combiner, and a memory.

[0065] The master FPGA and slave FPGA are connected to the master control unit via bidirectional asynchronous serial ports. The configuration FPGA is connected to the master control unit via bidirectional synchronous serial ports. The master FPGA and slave FPGA are connected. The configuration FPGA is connected to both the master FPGA and slave FPGA. The master FPGA and configuration FPGA are each connected to a memory. The input of the splitter is connected to the RF unit. The output of the splitter is connected to the input of the splitter group, the input of the first RF transceiver, and the input of the second RF transceiver. The output of the splitter group is connected to the slave FPGA via multiple Chirp modem chips and multiple LoRa modem chips. The outputs of the first and second RF transceivers are connected to the master FPGA. The master FPGA is also connected to the input of the third RF transceiver. The output of the third RF transceiver is connected to the input of the combiner. The input of the combiner is also connected to the slave FPGA via a LoRa modem chip. The output of the combiner is connected to the RF unit.

[0066] Among them, in the appendix Figure 3 In this circuit, the output of the splitter group is connected to the slave FPGA via two Chirp modem chips and 14 LoRa modem chips.

[0067] It should be noted that, when the RF unit and the baseband unit adopt the specific structure defined above, the first gain amplifier of the RF unit is connected to the splitter of the baseband unit, and the second fixed attenuator of the RF unit is connected to the combiner of the baseband unit.

[0068] In this embodiment of the invention, a splitter is used to split the radio frequency (RF) signal transmitted by the RF unit to distribute the RF signal to a splitter group, a first RF transceiver, and a second RF transceiver; the splitter group is used to split the received RF signal to distribute the RF signal to multiple Chirp modulation / demodulation chips and multiple LoRa modulation / demodulation chips connected to it; the slave FPGA performs parallel demodulation of the Chirp signal through multiple Chirp modulation / demodulation chips and parallel demodulation of the LoRa signal through multiple LoRa modulation / demodulation chips; the first RF transceiver and the second RF transceiver are used to convert the received RF signal into a baseband signal; the master FPGA demodulates the baseband signal output by the first RF transceiver according to a pre-configured operating mode, completes the parsing and processing of the COSPAS-SARSAT distress beacon signal, obtains the corresponding message information, or performs Fourier transform on the baseband signal output by the first RF transceiver. The system employs a Leaf Transform (FFT) to obtain low-noise spectral parameters. The master FPGA also demodulates the baseband signal output from the second RF transceiver, performing parsing of Chirp or LoRa signals to obtain corresponding message information. Furthermore, the master FPGA generates baseband signals according to given instructions and sends them to the third RF transceiver. The third RF transceiver converts the received baseband signal into an RF signal and sends it to the combiner. The slave FPGA generates LoRa signals using a LoRa modem chip according to given instructions and sends them to the combiner. The combiner merges signals from different channels into a single signal stream and sends it to the RF unit. The configuration FPGA performs on-orbit program reconfiguration for both the master and slave FPGAs, monitors for particle inversion in both FPGAs, and controls the master and slave FPGAs to reload program code when particle inversion occurs.

[0069] Furthermore, in the embodiments of the present invention, in the baseband unit described above, the memory includes at least one of programmable read-only memory (PROM), ferroelectric random access memory (FRAM), and flash memory to meet different storage requirements.

[0070] In this embodiment of the invention, the FPGA is configured to be connected to a programmable read-only memory, a ferroelectric random access memory, and a flash memory, respectively, and the main control FPGA is connected to a ferroelectric random access memory to meet actual usage requirements.

[0071] Furthermore, in this embodiment of the invention, in order to facilitate monitoring of the operating status of the master FPGA and the slave FPGA, the baseband unit also includes a watchdog timer. The watchdog timer is connected to the configuration FPGA and is used to monitor the operating status of the master FPGA and the slave FPGA. When the operating status is abnormal, the watchdog timer triggers the configuration FPGA so that the configuration FPGA controls the master FPGA and the slave FPGA to reset.

[0072] In this embodiment of the invention, the master control FPGA can be XC7VX690T, the slave control FPGA can be XC7A35T, the configuration FPGA can be XC7A35T, the Chirp modem chip can be JTM1100, the LoRa modem chip can be Lora1278, the RF transceiver can be AD9361, and the flash memory can be a four-channel SPI NOR flash memory.

[0073] In this embodiment of the invention, the baseband unit defined above can be used to achieve modulation and demodulation of various UHF band narrowband signals and encoding and decoding of message information, while effectively protecting the core device code and ensuring the stable operation of the baseband unit.

[0074] refer to Figure 4 Furthermore, in this embodiment of the invention, in order to realize the functions of the main control unit, the main control unit includes: a main processing controller, a backup processing controller, a crystal oscillator, a memory, an interface chip, and a power module.

[0075] The main processing controller and the backup processing controller are connected to the baseband unit, and are each connected to a crystal oscillator. They are also connected to a memory and an interface chip. The interface chip can connect to the satellite's telemetry, tracking, and command (TT&C) subsystem and / or data transmission subsystem. The power module can connect to an external power supply.

[0076] It should be noted that, when the baseband unit and the main control unit adopt the specific structure defined above, the main processing controller and the backup processing controller of the main control unit are connected to the configuration FPGA of the baseband unit through bidirectional synchronous serial ports, the main processing controller and the backup processing controller of the main control unit are connected to the main control FPGA of the baseband unit through bidirectional asynchronous serial ports, and the main processing controller and the backup processing controller of the main control unit are connected to the slave control FPGA of the baseband unit through bidirectional asynchronous serial ports.

[0077] In this embodiment of the invention, the main control unit is used to perform the following functions: connect to an external power supply via a power module to complete the conversion from primary power to secondary power supply, thereby providing power to the signal processing unit; connect to the satellite platform's telemetry and control subsystem and data transmission subsystem via an interface chip to receive and execute remote control commands and telemetry commands sent by the telemetry and control subsystem, and transmit stored data to the data transmission subsystem; receive demodulated data sent by the baseband unit via a bidirectional asynchronous serial port and store it in a memory; send telemetry commands to the baseband unit via a bidirectional asynchronous serial port to obtain telemetry data from the baseband unit; and send reconstruction program code to the baseband unit via a bidirectional synchronous serial port.

[0078] In this embodiment of the invention, the main processing controller and the backup processing controller form a redundant design. When the main processing controller malfunctions or fails, the backup processing controller is put into use to ensure the stable operation of the main control unit.

[0079] In this embodiment of the invention, a crystal oscillator is used to provide a stable and accurate clock signal.

[0080] Furthermore, in this embodiment of the invention, the memory in the main control unit includes at least one of a programmable read-only memory, a ferroelectric random access memory, and a flash memory, to meet storage requirements.

[0081] In this embodiment of the invention, the memory in the main control unit includes a ferroelectric random access memory and a flash memory. The main processing controller and the backup processing controller are respectively connected to the ferroelectric random access memory and the flash memory to meet different actual task requirements.

[0082] Furthermore, in this embodiment of the invention, the interface chip includes a CAN interface chip and an LVDS interface chip. The main processing controller and the backup processing controller can be connected to the measurement and control subsystem through the CAN interface chip, and the main processing controller and the backup processing controller can be connected to the data transmission subsystem through the LVDS interface chip.

[0083] By setting up CAN interface chips and LVDS interface chips for connecting the measurement and control subsystem to the main control unit and the data transmission subsystem to the main control unit, respectively, the efficiency and accuracy of command and data transmission can be improved.

[0084] refer to Figure 4 Furthermore, in this embodiment of the invention, the main control unit also includes a watchdog timer, which is connected to the main processing controller and the backup processing controller respectively, for monitoring the operating status of the main processing controller and the backup processing controller, and triggering the main processing controller and the backup processing controller when the operating status is abnormal, so as to reset the main processing controller and the backup processing controller.

[0085] In this embodiment of the invention, the main processing controller and the backup processing controller can be selected from M2S090.

[0086] refer to Figure 5Furthermore, in this embodiment of the invention, in order 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 and heat dissipation requirements of the signal processing unit within the system, the space-based multi-system narrowband signal parallel processing system also includes a protective housing. The signal processing unit is installed inside 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 source, the data interface is used to connect to the telemetry, tracking, and command subsystem and the data transmission subsystem of the satellite platform, and the radio frequency interface is used to connect to a deployable circular flexible antenna.

[0087] Furthermore, in this embodiment of the invention, the protective shell is made of lattice metamaterials, manufactured using additive manufacturing processes, and employs a high-rigidity, low-mass bidirectional structural design to ensure that the mechanical structure of the protective shell can achieve multiple objectives of vibration resistance, heat dissipation, and lightweighting while meeting the electromagnetic shielding function. Simultaneously, the protective shell also employs a porous material micro-topology multi-level structure design to suppress and dissipate stress waves at specific frequencies.

[0088] Based on the above design and manufacturing method, the resulting protective shell, compared with conventional protective shells, can achieve a 15% weight reduction while ensuring the overall structural rigidity and protection performance requirements. It can realize the integrated design of lightweight signal processing unit, vibration isolation and heat dissipation.

[0089] refer to Figure 6-7 Furthermore, in this embodiment of the invention, the deployable flexible antenna includes: an antenna support 1, an array arm limiting mechanism 2, an elastic element 3, a multi-functional feed center shaft 4, a feed cable 5, a low-frequency flexible array 6, a medium-frequency flexible array 7, a high-frequency flexible array 8, a clamping rope 9, and a rope cutter 10.

[0090] An array arm limiting mechanism 2 is provided on the antenna support 1. One end of an elastic element 3 is mounted on the antenna support 1, and the other end is connected to the multi-functional feed center shaft 4. The elastic element 3 can drive the multi-functional feed center shaft 4 to swing. A feed cable 5 is provided on the multi-functional feed center shaft 4, and the feed cable 5 extends along the axial direction of the multi-functional feed center shaft 4. One end of a low-frequency flexible array 6 is fixed on the multi-functional feed center shaft 4, and the low-frequency flexible array 6 can be wound around the multi-functional feed center shaft 4 circumferentially. One end of an intermediate-frequency flexible array 7 is fixed on the multi-functional feed center shaft 4, and the intermediate-frequency flexible array 7 can be wound around the multi-functional feed center shaft 4 circumferentially. One end of a high-frequency flexible array 8 is fixed on the multi-functional feed center shaft 4. On the 4th, the high-frequency flexible array 8 can be wound around the multi-functional feed center shaft 4 circumferentially. The low-frequency flexible array 6, the intermediate-frequency flexible array 7 and the high-frequency flexible array 8 are distributed axially along the multi-functional feed center shaft 4. The clamping rope 9 is detachably set on the antenna support 1. The clamping rope 9 can press the multi-functional feed center shaft 4 onto the antenna support 1. The rope cutter 10 is installed on the antenna support 1. After the rope cutter 10 is activated, it can disconnect the clamping rope 9. When the multi-functional feed center shaft 4 is pressed onto the antenna support 1 by the clamping rope 9, the elastic element 3 is in a bent and compressed state, and the array arm limiting mechanism 2 set on the antenna support 1 is in contact with the low-frequency flexible array 6, the intermediate-frequency flexible array 7 and the high-frequency flexible array 8 wound on the multi-functional feed center shaft 4.

[0091] In this embodiment of the invention, based on the structure of the deployable periodic flexible antenna defined above, the deployable periodic flexible antenna has two states: a retracted state and an deployed state. When the deployable periodic flexible antenna is in the retracted state, the multi-functional feed center shaft 4 is pressed against the antenna support 1 under the action of the clamping rope 9. The low-frequency flexible array 6, the intermediate-frequency flexible array 7, and the high-frequency flexible array 8 are always wrapped around the multi-functional feed center shaft 4 under the action of the array arm limiting mechanism 2. When the deployable periodic flexible antenna needs to be deployed, the rope cutter 10 is activated to disconnect the clamping rope 9. The multi-functional feed center shaft 4 swings upward under the action of the elastic element 3. During the upward swing of the multi-functional feed center shaft 4, the high-frequency flexible array 8, the intermediate-frequency flexible array 7, and the low-frequency flexible array 6, which are fixed and wrapped around the multi-functional feed center shaft 4, separate from the array arm limiting mechanism 2 in sequence, thereby unfolding and releasing in sequence to complete the array arm deployment.

[0092] The deployable circular flexible antenna provided in this embodiment of the invention can achieve a high deployment-to-reception ratio before launch and can automatically deploy after entering orbit, thereby reducing the space required for antenna arrangement.

[0093] In the deployable circular flexible antenna provided in this embodiment of the invention, the low-frequency flexible array 6 includes two sets of mutually orthogonal elements, the mid-frequency flexible array 7 includes two sets of mutually orthogonal elements, and the high-frequency flexible array 8 includes two sets of mutually orthogonal elements. The multifunctional feed center axis 4 is used to realize the excitation feed conduction and structural support of the two sets of orthogonal flexible arrays, to provide high-rigidity support when the antenna is stored, to ensure the deformation and recovery control of the antenna radiation structure, to absorb stress and acceleration impact during the antenna deployment and release process, to ensure the integrity of the antenna, and to achieve high-rigidity and high-reliability support after the antenna is deployed and locked, to ensure that the high-frequency guided wave simultaneously meets the following performance requirements: low-loss conduction with high amplitude and phase consistency; and efficient energy conversion for radiation to space electromagnetic waves.

[0094] In the deployable circular flexible antenna provided in this embodiment of the invention, by exciting the high-frequency flexible element 8, the mid-frequency flexible element 7 and the low-frequency flexible element 6 respectively, the differential phase of the spatial field can be superimposed with equal amplitude, and the final high-purity circularly polarized radiation can be achieved.

[0095] refer to Figure 6-7 Furthermore, in this embodiment of the invention, the rope cutter 10 includes two rope cutters 10, which are respectively installed on the antenna support 1 and located on both sides of the multi-functional feed center shaft 4.

[0096] By setting two rope breakers 10, it can be ensured that the clamping rope 9 is completely broken, thus ensuring that the deployable circumferential flexible antenna can be deployed smoothly.

[0097] Furthermore, in this embodiment of the invention, the rope cutter 10 is an unlocking hot knife, which can melt and cut the clamping rope 9 after being activated.

[0098] Furthermore, in this embodiment of the invention, the array arm limiting mechanism 2 is a limiting support mounted on the antenna support 1. By utilizing the limiting support, when the multi-functional feed center shaft 4 is pressed onto the antenna support 1, the low-frequency flexible array 6, the intermediate-frequency flexible array 7, and the high-frequency flexible array 8 can be limited, ensuring that the flexible arrays are always wound around the multi-functional feed center shaft 4.

[0099] Furthermore, in the deployable circular flexible antenna provided in the embodiments of the present invention, in order to facilitate the assembly and disassembly of the antenna, the antenna support 1 is provided with a threaded interface, and the antenna support 1 is detachably mounted on the satellite platform through the threaded interface.

[0100] Furthermore, in this embodiment of the invention, based on the aforementioned defined structure of the deployable perimeter flexible antenna, corresponding simulation experiments were conducted to obtain the corresponding low-frequency, mid-frequency, and high-frequency radiation pattern simulation results. Specifically, in the low-frequency radiation pattern simulation results, the antenna gain is approximately 5.98 dB, the 3 dB beamwidth is approximately 100°, the gain at the 60° beam edge is approximately 1.1 dB, the front-to-back ratio is approximately 51 dB, and the radiation characteristics of each cross-section exhibit excellent rotational symmetry. In the mid-frequency radiation pattern simulation results, the antenna gain is approximately 6.1 dB, the 3 dB beamwidth is approximately 100°, the gain at the 60° beam edge is approximately 1.26 dB, the front-to-back ratio is approximately 54 dB, and the radiation characteristics of each cross-section exhibit excellent rotational symmetry. In the high-frequency radiation pattern simulation results, the antenna gain is approximately 6.3 dB, the 3 dB beamwidth is approximately 105°, the gain at the 60° beam edge is approximately 1.46 dB, the front-to-back ratio is approximately 59 dB, and the radiation characteristics of each cross-section exhibit excellent rotational symmetry.

[0101] As can be seen, the deployable circular flexible antenna provided in this embodiment of the invention maintains quasi-constant radiation characteristics within the operating frequency band, enabling broadband radiation pattern design.

[0102] refer to Figure 8 Secondly, embodiments of the present invention also provide a space-based multi-system narrowband signal parallel processing method, which applies the above-mentioned space-based multi-system narrowband signal parallel processing system and includes the following steps:

[0103] The main control unit parses the remote control commands, generates corresponding configuration commands based on the parsing results, and sends them to the baseband unit so that the baseband unit can configure the working parameters and working mode according to the configuration commands.

[0104] Based on the configured operating parameters and operating mode, the baseband unit analyzes and processes the UHF band narrowband signal transmitted by the radio frequency unit, and sends the analyzed data to the main control unit.

[0105] Based on the configured operating parameters and operating mode, the baseband unit receives and modulates the data sent by the main control unit, generates radio frequency signals and sends them to the radio frequency unit, and then uses the radio frequency unit and the deployable circular flexible antenna to broadcast the radio frequency signals outward.

[0106] Furthermore, in this embodiment of the invention, the operating modes include: a receiving mode, a broadcasting mode, and a spectrum sensing mode. Specifically, when the space-based multi-system narrowband signal parallel processing system enters the receiving mode, it receives various UHF band narrowband signals in a wide-area parallel manner, encapsulates the parsed messages in a pre-defined frame format, and transmits the parsed data to the satellite's data transmission subsystem upon receiving a data transmission command. When the space-based multi-system narrowband signal parallel processing system enters the broadcasting mode, it generates radio frequency signals according to actual needs and broadcasts them 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, it performs frequency sweep sensing on the 406~425MHz band, performs real-time parsing of the sensed signals to obtain messages, encapsulates the parsed messages in a pre-defined frame format, and transmits the parsed data to the satellite's data transmission subsystem upon receiving a data transmission command.

[0107] The space-based multi-mode narrowband signal parallel processing method provided in this embodiment of the invention enables parallel reception and processing of various UHF band narrowband signals by setting the main control unit to update and configure the running program code of the baseband unit, and to adjust and configure the working parameters and working modes of the baseband unit.

[0108] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, the terms "front," "back," "left," "right," "upper," and "lower" in this document refer to the placement shown in the accompanying drawings.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A space-based multi-mode narrowband signal parallel processing system, characterized in that, The system includes: A signal processing unit, comprising a main control unit, a baseband unit, and a radio frequency unit connected in sequence; The main control unit is equipped with an interface, which enables it to connect to the satellite's telemetry, tracking, command and control subsystem and data transmission subsystem. The main control unit can receive and parse remote control commands and / or telemetry commands sent by the telemetry, tracking, and command subsystem, generate configuration commands based on the remote control commands, and send the configuration commands to the baseband unit. It can also transmit data sent by the baseband unit to the data transmission subsystem based on the telemetry commands. The baseband unit is used to receive and store the program code sent by the main control unit, configure the working parameters and working mode according to the configuration instructions sent by the main control unit, perform modulation of UHF band narrowband signals and encoding of message information based on the configured working parameters and working mode, obtain the corresponding radio frequency signal and send it to the radio frequency unit, and perform demodulation of UHF band narrowband signals and decoding 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 signal and then send it to the baseband unit or the deployable circumferential flexible antenna. The deployable circumferential flexible antenna adopts a symmetrical circumferential radiation design and is used to receive and transmit narrowband signals in the UHF band. The baseband unit includes: a master control FPGA, a slave control FPGA, a configuration FPGA, a splitter, a splitter group, a Chirp modem chip, a LoRa modem chip, a first RF transceiver, a second RF transceiver, a third RF transceiver, a combiner, and a memory. The splitter is used to split the radio frequency (RF) signal transmitted by the RF unit to distribute the RF signal to the splitter group, the first RF transceiver, and the second RF transceiver; the splitter group is used to split the received RF signal to distribute the RF signal to multiple Chirp modulation / demodulation chips and multiple LoRa modulation / demodulation chips connected to it; the slave FPGA performs parallel demodulation of Chirp signals through multiple Chirp modulation / demodulation chips and parallel demodulation of LoRa signals through multiple LoRa modulation / demodulation chips; the first RF transceiver and the second RF transceiver are used to convert the received RF signal into a baseband signal; the master FPGA demodulates the baseband signal output by the first RF transceiver according to a pre-configured operating mode, completes the parsing and processing of the COSPAS-SARSAT distress beacon signal, obtains the corresponding message information, or performs Fourier transform processing on the baseband signal output by the first RF transceiver. The system performs the following steps: First, it obtains low-noise spectrum parameters. Second, the master FPGA demodulates the baseband signal output from the second RF transceiver, performs parsing of Chirp or LoRa signals, and obtains corresponding message information. Third, the master FPGA generates a baseband signal according to a given instruction and sends it to the third RF transceiver. The third RF transceiver converts the received baseband signal into an RF signal and sends it to the combiner. Fourth, the slave FPGA generates a LoRa signal using the LoRa modulation / demodulation chip according to a given instruction and sends it to the combiner. The combiner merges signals from different channels into a single signal stream and sends it to the RF unit. Fifth, the configuration FPGA performs on-orbit program reconfiguration for the master and slave FPGAs, monitors whether particle inversion occurs in the master and slave FPGAs, and controls the master and slave FPGAs to reload program code when particle inversion occurs. The baseband unit can realize parallel modulation and demodulation of various UHF band narrowband signals and parallel encoding and decoding of message information, while effectively protecting the core device code and ensuring stable operation.

2. The space-based multi-mode narrowband signal parallel processing system according to claim 1, characterized in that, The radio frequency unit includes: an LC filter, a circulator, a limiter, a first low-noise amplifier, a first surface acoustic wave (SAW) filter, a second low-noise amplifier, a second SAW filter, a first fixed attenuator, a first gain amplifier, a second fixed attenuator, a third SAW filter, a second gain amplifier, a fourth SAW filter, a third fixed attenuator, a driver amplifier, a fourth fixed attenuator, and a power amplifier. The LC filter is bidirectionally transmitted to the deployable circular flexible antenna and the circulator, respectively. One output terminal of the circulator is connected to the input terminal of the limiter. The limiter, the first low-noise amplifier, the first surface acoustic wave (SAW) filter, the second low-noise amplifier, the second SAW filter, the first fixed attenuator, and the first gain amplifier are connected in sequence. The output terminal 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 SAW filter, the second low-noise amplifier, the second SAW filter, the first fixed attenuator, and the first gain amplifier form a receiving link. The input terminal of the second fixed attenuator is connected to the baseband unit. The second fixed attenuator, the third surface acoustic wave (SAW) filter, the second gain amplifier, the fourth SAW filter, the third fixed attenuator, the driver amplifier, the fourth fixed attenuator, and the power amplifier are connected in sequence. The output terminal of the power amplifier is connected to one input terminal of the circulator. The second fixed attenuator, the third SAW filter, the second gain amplifier, the fourth SAW filter, the third fixed attenuator, the driver amplifier, the fourth fixed attenuator, the power amplifier, the circulator, and the LC filter form a transmit link.

3. The space-based multi-mode narrowband signal parallel processing system according to claim 1, characterized in that, The baseband unit also includes a watchdog timer connected to the configuration FPGA. The watchdog timer is used to monitor the operating status of the master FPGA and the slave FPGA, and triggers the configuration FPGA when the operating status is abnormal, so that the configuration FPGA controls the master FPGA and the slave FPGA to reset.

4. The space-based multi-mode narrowband signal parallel processing system according to claim 1, characterized in that, The main control 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 the crystal oscillator. The main processing controller and the backup processing controller are respectively connected to the memory. The main processing controller and the backup processing controller are respectively connected to the interface chip. The interface chip can be connected to the satellite's telemetry and control subsystem and / or data transmission subsystem. The power module can be connected to an external power supply.

5. The space-based multi-mode narrowband signal parallel processing system according to claim 1, characterized in that, It also includes a protective housing, in which the signal processing unit is installed. 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 source, the data interface is used to connect to the satellite's telemetry and control subsystem and the data transmission subsystem, and the radio frequency interface is used to connect to the deployable circular flexible antenna.

6. The space-based multi-mode narrowband signal parallel processing system according to claim 1, characterized in that, The deployable circular flexible antenna includes: an antenna support, an array arm limiting mechanism, an elastic element, a multi-functional feed center shaft, a feed cable, a low-frequency flexible array, a medium-frequency flexible array, a high-frequency flexible array, a clamping rope, and a rope cutter. The antenna support is equipped with the array arm limiting mechanism. One end of the elastic element is mounted on the antenna support, and the other end is connected to the multi-functional feed center shaft. The elastic element can drive the multi-functional feed center shaft to swing. The feed cable is provided on the multi-functional feed center shaft, and the feed cable extends along the axial direction of the multi-functional feed center shaft. One end of the low-frequency flexible array is fixed on the multi-functional feed center shaft, and the low-frequency flexible array can be wound around the multi-functional feed center shaft circumferentially. One end of the intermediate-frequency flexible array is fixed on the multi-functional feed center shaft, and the intermediate-frequency flexible array can be wound around the multi-functional feed center shaft circumferentially. One end of the high-frequency flexible array is fixed on the multi-functional feed center shaft. The high-frequency flexible array can be wound around the multi-functional feed center axis circumferentially. The low-frequency flexible array, the mid-frequency flexible array, and the high-frequency flexible array are distributed axially at intervals along the multi-functional feed center axis. The clamping rope is detachably mounted on the antenna support. The clamping rope can press the multi-functional feed center axis onto the antenna support. The rope cutter is mounted on the antenna support. After the rope cutter is activated, it can disconnect the clamping rope. When the multi-functional feed center axis is pressed onto the antenna support by the clamping rope, the elastic element is in a bent and compressed state. The array arm limiting mechanism provided on the antenna support respectively contacts and cooperates with the low-frequency flexible array, the mid-frequency flexible array, and the high-frequency flexible array wound on the multi-functional feed center axis.

7. The space-based multi-mode narrowband signal parallel processing system according to claim 1, characterized in that, The UHF band narrowband signals include one or more of the following: COSPAS-SARSAT distress beacon signal, Chirp IoT terminal signal, LoRa IoT terminal signal, wearable device signal, airborne emergency positioning transmitter signal, and flight crew life-saving radio signal.

8. A method for parallel processing of space-based multi-system narrowband signals using the space-based multi-system narrowband signal parallel processing system as described in any one of claims 1-7, characterized in that, The method includes: The main control unit parses the remote control commands, generates corresponding configuration commands based on the parsing results, and sends them to the baseband unit so that the baseband unit can configure the working parameters and working mode according to the configuration commands. Based on the configured operating parameters and operating mode, the baseband unit analyzes and processes the UHF band narrowband signal transmitted by the radio frequency unit, and sends the analyzed data to the main control unit. Based on the configured operating parameters and operating mode, the baseband unit receives and modulates the data sent by the main control unit, generates radio frequency signals and sends them to the radio frequency unit, and then uses the radio frequency unit and the deployable circular flexible antenna to broadcast the radio frequency signals outward.

9. The space-based multi-system narrowband signal parallel processing method according to claim 8, characterized in that, The operating modes include: receiving mode, broadcasting mode, and spectrum sensing mode.

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