CN111478726A - Communication system for small communication satellite - Google Patents
Communication system for small communication satellite Download PDFInfo
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Abstract
The invention discloses a communication system for a small communication satellite, which is arranged on a satellite platform of the communication satellite and comprises an antenna subsystem, a transceiver and a storage module. The antenna subsystem comprises a transceiving phased array antenna and a reflector antenna; the transceiver comprises a frequency conversion module, a frequency source module, a digital processing module and a power supply module and is used for realizing the processing and the forwarding of signals; in addition, the transceiver can also realize the broadcasting of the telemetering data by reading the telemetering data stored in the storage module. The communication system has five operating modes, including: the system comprises a broadcast mode, a transparent forwarding mode, an engineering telemetry data transmission mode, an upper injection mode and a measurement and control mode, and can support the communication speed of 10kbps to 100 Mbps.
Description
Technical Field
The invention relates to the technical field of aerospace, in particular to a communication system of a small communication satellite.
Background
As a space part of a satellite communication system, a communication satellite is one of the earliest and most widely used satellites in the world, and communication satellites are launched in many countries such as the united states, the former soviet union/russia, and china. The communication satellite is used as a radio communication relay station and is mainly used for forwarding radio signals so as to realize communication between satellite communication earth stations including mobile phone terminals or between the earth stations and a spacecraft. Communication satellites can be classified into different types according to different classification criteria, for example: according to different orbits, the satellite can be divided into an earth static orbit communication satellite, a large elliptic orbit communication satellite, a middle orbit communication satellite and a low orbit communication satellite; according to different service areas, the satellite communication system can be divided into an international communication satellite, a regional communication satellite and a domestic communication satellite; according to different purposes, the satellite can be divided into a military communication satellite, a civil communication satellite and a commercial communication satellite; according to different communication service types, the satellite system can be divided into a fixed communication satellite, a mobile communication satellite, a television broadcasting satellite, a maritime communication satellite and a tracking and data relay satellite; and may be classified into a dedicated communication satellite and a general-purpose communication satellite according to the usage. Wherein a geostationary orbit communication satellite is capable of covering approximately 40% of the surface of the earth, such that any ground, sea, or air communication stations within the coverage area can simultaneously communicate with each other. If 3 geostationary orbit communication satellites are spaced at equal intervals on the equator, global communication can be realized except for the two polar regions.
A communication satellite, which is a kind of satellite, includes various very dense electronic and electrical devices, has powerful functionality and technology, and is an extremely complex system. The communication system is used as a core system of the communication satellite, and the design of the communication system directly influences the performance of the communication satellite. With the continuous development of technology, communication satellites are also being miniaturized and lightened, and the requirements for the diversity of functions are increasing. In order to meet the development requirements of communication satellites, a new communication system for communication satellites needs to be designed.
Disclosure of Invention
In order to meet the requirements of miniaturization, light weight and multiple functionality of a communication satellite, the invention provides a communication system for a small communication satellite, which can be arranged on a satellite platform of the communication satellite, and comprises:
the antenna subsystem comprises a transceiving phased array antenna and a reflector antenna and is used for receiving signals sent from the satellite communication ground station and sending specified data to the specified satellite communication ground station;
the transceiver receives the radio frequency signal of the antenna subsystem, processes the radio frequency signal, or responds to a satellite instruction to form designated data, and sends the designated data to the antenna subsystem, and the transceiver comprises a frequency conversion module, a frequency source module, a digital processing module and a power supply module; and
and the storage module is connected with the satellite platform and the transceiver in a communication way and is used for storing the satellite telemetry data of the communication satellite, and the transceiver reads the satellite telemetry data, encodes and modulates the satellite telemetry data to form designated data and then broadcasts the data downwards through the antenna subsystem.
Furthermore, the transmitting and receiving phased array antenna is a transmitting and receiving split phased array antenna system, adopts a brick high-density hybrid integration mode, and comprises a 48-element receiving phased array antenna and a 32-element transmitting phased array antenna.
Further, the reflector antenna is a cassegrain reflector antenna, including:
the ring focus reflecting surface is used for focusing the wave beam of the specific frequency band;
the corrugated horn feed source is used for realizing primary irradiation of the reflector antenna; and
and the microwave network is used for realizing the circular polarization formation of the antenna and the separation of the transmitting and receiving signals.
Further, the frequency conversion module includes:
the down-conversion channel is used for converting the radio frequency line number received from the antenna subsystem to an intermediate frequency signal through two times of frequency conversion, and adopts a cold backup mode and comprises a main down-conversion channel and a backup down-conversion channel;
the up-conversion channel is used for converting the intermediate frequency signal output by the digital processing module into a radio frequency signal through two times of frequency conversion, adopts a cold backup mode and comprises a main up-conversion channel and a backup up-conversion channel; and
a signal selection module comprising:
the receiving signal selection submodule is connected with the input end of the down-conversion channel and used for determining the input signal of the down-conversion channel, and the receiving signal selection submodule comprises two single-pole double-throw Switches (SPDT); and
and the sending signal selection submodule is connected with the output end of the up-conversion channel and is used for determining an antenna for sending signals, and the sending signal selection submodule comprises two single-pole double-throw switches SPDT.
Further, the communication system further comprises a radio frequency front end and a power amplifier, wherein the radio frequency front end is used for filtering and low-noise amplification of the radio frequency signals sent by the reflector antenna, and the power amplifier is used for amplifying the radio frequency signals sent to the reflector.
Further, the digital processing module adopts an integrated design, including:
the digital-to-analog conversion sub-module is used for collecting the intermediate frequency signal output by the down-conversion channel and carrying out analog-to-digital or digital-to-analog conversion on the signal;
the FPGA is connected with the digital-to-analog conversion submodule in a communication way and is used for performing digital filtering and frequency compensation on the signal output by the digital-to-analog conversion submodule and generating a broadcast signal;
the digital signal processing submodule DSP is connected with the FPGA in a communication mode and is used for beam pointing calculation and load control; and
and the load control circuit is used for completing software reloading control of the SRAM type processing FPGA and the DSP and refreshing control of the anti-single-event SEU by matching with an external PROM program memory 405 and an F L ASH memory 406.
Further, the power module receives a 12V bus of the satellite platform and is configured to provide power to the transceiving phased array antenna and the transceiver.
Further, the storage capacity of the storage module is larger than 12 GB.
Further, the storage module performs data transmission with the communication satellite through a three-wire system synchronous RS422 protocol, performs data transmission with the transceiver through a three-wire system L VDS protocol, and the communication satellite controls the storage module through a CAN bus.
Further, the storage module is powered by 5V, separately from the satellite platform, flying through an L RM connector and secured into a mounting plate.
The communication system for the small communication satellite adopts the combination of the phased array antenna and the reflector antenna, simultaneously adopts the storage module to store the telemetering data of the satellite, carries out signal processing and data forwarding through the transceiver, has the functions of measurement and control and communication, and can support the communication rate of 10kbps to 100 Mbps. Furthermore, the system employed phased array antennas with a volume of 179 × 119 × 88mm and a weight of 2 kg; the size of the reflector antenna is phi 286mm multiplied by 305mm, and the weight is 1.9 kg; and the size of the transceiver is 250 × 114 × 165mm, the weight is 5.9Kg, the whole volume of the system is small, the weight is light, the size of the whole volume and the weight of the satellite is effectively reduced, and the aims of light weight and miniaturization are achieved.
Drawings
To further clarify the above and other advantages and features of embodiments of the present invention, a more particular description of embodiments of the present invention will be rendered by reference to the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. In the drawings, the same or corresponding parts will be denoted by the same or similar reference numerals for clarity.
FIG. 1 is a schematic diagram illustrating the components of a communication system for a small communication satellite in accordance with one embodiment of the present invention;
figure 2 shows a schematic diagram of a transmit-receive phased array antenna configuration according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of a reflector antenna configuration according to an embodiment of the present invention;
fig. 4 shows a schematic diagram of a transceiver structure of an embodiment of the present invention;
FIG. 5 shows a schematic diagram of a frequency conversion scheme of one embodiment of the present invention;
FIG. 6 illustrates a functional block diagram of the RF front end and signal selection module of one embodiment of the present invention;
FIG. 7 illustrates a functional block diagram of a down conversion channel of one embodiment of the present invention;
FIG. 8 illustrates a functional block diagram of a phase locked loop of one embodiment of the present invention;
FIG. 9 shows a schematic diagram of an AGC control scheme of one embodiment of the present invention;
FIG. 10 is a block diagram of a digital processing module according to an embodiment of the invention;
FIG. 11 is a schematic diagram of an interface circuit of a power module with a satellite platform bus according to an embodiment of the invention;
fig. 12 shows a functional block diagram of a transceiver of one embodiment of the present invention;
FIG. 13 shows a functional block diagram of a circuit of a memory module of one embodiment of the present invention;
FIG. 14 illustrates a power tree topology diagram of a memory module of one embodiment of the present invention;
fig. 15 shows a signal flow diagram in a broadcast mode of the communication system;
fig. 16 shows a signal flow diagram in a transparent forwarding mode of the communication system;
fig. 17 is a signal flow diagram in the communication system engineering telemetry data transmission mode;
fig. 18 shows a signal flow diagram in an annotate mode of the communication system; and
fig. 19 shows a signal flow diagram in the measurement and control mode of the communication system.
Detailed Description
In the following description, the present invention is described with reference to examples. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details, or with other alternative and/or additional methods, materials, or components. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention. Similarly, for purposes of explanation, specific numbers, materials and configurations are set forth in order to provide a thorough understanding of the embodiments of the invention. However, the invention is not limited to these specific details. Further, it should be understood that the embodiments shown in the figures are illustrative representations and are not necessarily drawn to scale.
Reference in the specification to "one embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.
It should be noted that the embodiment of the present invention describes the process steps in a specific order, however, this is only for the purpose of illustrating the specific embodiment, and does not limit the sequence of the steps. Rather, in various embodiments of the present invention, the order of the steps may be adjusted according to process adjustments.
In order to meet the requirements of miniaturization, light weight and multiple functions of a communication satellite, the invention provides a communication system for the small communication satellite, wherein the communication system has five working modes and comprises: the system comprises a broadcast mode, a transparent forwarding mode, an engineering remote measuring data transmission mode, an upper note mode and a measurement and control mode. The invention is further described below with reference to the accompanying drawings of embodiments.
Fig. 1 shows a schematic block diagram of a communication system for small communication satellites according to an embodiment of the invention. As shown in fig. 1, a communication system for a small communication satellite, which may be disposed on a satellite platform of a communication satellite, includes an antenna subsystem 001, a transceiver 002, and a memory module 003.
The antenna subsystem 001 comprises a transceiving phased array antenna 101 and a reflector antenna 102, on one hand, the antenna subsystem receives signals sent from a satellite communication ground station, the signals comprise data required to be forwarded in a transparent forwarding mode, data required to be uploaded in an uploading mode and data sent to a platform star in a measurement and control mode, on the other hand, the antenna subsystem sends specified data to the specified satellite communication ground station, and under different working modes, the specified data are different:
when the communication system operates in a broadcast mode, the specified data is generated by processing data transmitted from the CAN bus via the transceiver 002;
when the communication system is operating in a transparent forwarding mode, the specified data is generated by processing the radio frequency signal from the antenna subsystem 001 via the transceiver 002;
when the communication system works in an engineering telemetry data transmission mode, the specified data is generated by processing the satellite telemetry data extracted from the storage module 003 through the transceiver 002; and
when the communication system is operating in the measurement and control mode, the specified data is generated by processing the radio frequency signal from the antenna subsystem 001 through the platform star and the transceiver 002.
In order to implement the above functions, in an embodiment of the present invention, the phased array antenna 101 is configured as shown in fig. 2, and adopts a brick-and-block high-density hybrid integration mode, the volume of the phased array antenna is 179 × 119 × 88mm, and the weight of the phased array antenna is 2kg, the phased array antenna includes an antenna array 1011, a T/R assembly 1012, and a signal synthesis/decomposition network 1013, wherein the antenna array 1011 is a transmit-receive split phased array antenna system, and includes a 48-element receive phased array antenna, and a 32-element transmit phased array antenna, and can implement simultaneous bidirectional communication. The phased array antenna 101 can meet the requirement of 110-degree wide-range scanning of the wave beam, can quickly reconstruct the wave beam direction and the wave beam width by phase weighting according to system instructions, covers a given area and realizes reconstruction of a directional diagram, the array gain is 20dB in conventional weighting, and the directional diagram can be reconstructed into 5dB and 10dB gain after amplitude and phase weighting, so that multi-gear control is realized; and
in another embodiment of the present invention, the reflector antenna 102 is in the form of a cassegrain reflector antenna, having a size of Φ 286mm × 305mm and a weight of 1.9kg, as shown in fig. 3, and the reflector antenna 102 includes:
the ring focus reflecting surface comprises a main reflecting surface 1021 and an auxiliary reflecting surface 1022, and is used for realizing beam focusing of a specific frequency band;
a corrugated horn feed 1023 for implementing primary illumination of the reflector antenna;
and
a microwave network 1024, including a circular polarizer 241, an orthogonal mode coupler 242, a blocking filter 243, a blocking filter 244, a receiving port 245 and a transmitting port 246, wherein the circular polarizer 241 is used for realizing circular polarization formation of an antenna, the orthogonal mode coupler 242 separates a transmitting and receiving signal, the receiving signal is then transmitted to the receiving port 245 through the blocking filter 243, and the transmitting signal is separated through the blocking filter 244 through the transmitting port 246.
The transceiver 002 receives the rf signal of the antenna subsystem 001 and processes the rf signal or responds to a satellite command to form designated data, and reads the data in the storage module 003 and processes the data to form designated data, and the designated data is transmitted to a designated satellite communication ground station via the antenna subsystem 001. In an embodiment of the present invention, as shown in fig. 4, the transceiver 002 includes 1 up-conversion module 201, 1 down-conversion module 202, 1 frequency source module 203, 1 digital processing module 204, and 1 power supply module 205, wherein the frequency source module cooperates with the up-conversion module and the down-conversion module to realize up-and-down conversion of the communication system. The transceiver 002 is 250 x 114 x 165mm in size and weighs 5.9 Kg. Wherein:
the up-down conversion includes that the radio frequency signal received from the antenna subsystem is converted into an intermediate frequency signal of 375MHz and 200MHz after being subjected to two frequency conversions, and the intermediate frequency signal of 375MHz output by the digital processing module 204 is converted into a radio frequency signal after being subjected to 2 frequency conversions, and is transmitted, in an embodiment of the present invention, a frequency conversion overall scheme of the transceiver is as shown in fig. 5:
firstly, a receiving signal selection submodule formed by two single-pole double- throw switches SPDT 5031 and 5032 selects which antenna to use for frequency conversion, then a down-conversion channel converts a radio-frequency signal from an antenna subsystem into an intermediate-frequency signal, the intermediate-frequency signal is sent to a digital processing module 204 for processing, the intermediate-frequency signal output by the digital processing module is converted into a radio-frequency signal by two times of frequency conversion through an up-conversion channel, and then a sending signal selection submodule formed by two single-pole double- throw switches SPDT 5033 and 5034 selects which antenna to use for transmission. The up-conversion channel and the down-conversion channel both adopt a cold backup mode, and respectively include a main up-conversion channel 5041, a backup up-conversion channel 5042, a main down-conversion channel 5051 and a backup down-conversion channel 5052. In addition, for the reflector antenna, filtering and low-noise amplification are required to be performed through the radio frequency front end 501, and meanwhile, when the load works in a high-gain mode composed of the reflector antenna, a radio frequency signal is required to be amplified through the power amplifier single chip 502 and then sent to the reflector antenna. A schematic block diagram of the radio frequency front end 501 is shown in fig. 6;
in another embodiment of the present invention, the down-conversion channel converts the radio frequency signal received from the antenna subsystem into an intermediate frequency signal with a bandwidth of 200MHz and 375MHz after two times of frequency conversion, and the specific principle thereof is shown in fig. 7. In order to realize frequency synthesis and facilitate filtering, the first intermediate frequency of a down-conversion channel is preset to be 4012.5MHz, a receiving local oscillator adopts 23.5-26 GHz, the frequency is stepped by 25MHz, the signal is converted to 4012.5MHz intermediate frequency signal, and then 3637.5MHz is utilized for secondary frequency conversion to 375 MHz;
and
in one embodiment of the invention, the function is realized by using a phase-locked loop, specifically, ADF41513BCPZ of ADI company, the schematic diagram of which is shown in FIG. 8, and the VCO in the circuit is realized by HMC 739L P4E of ADI company, wherein the phase-locked loop is a decimal phase-locked loop and passes on-track verification, can realize fine step frequency hopping, and has the lowest noise substrate of 233dBC/Hz on the market at present.
Because the communication system in the embodiment of the invention is compatible with various aperture terminals, various communication rates and bandwidths, and the antenna subsystem has various antenna gains, the signal input power of the whole system is dynamic and the fixed intermediate frequency and radio frequency gains can not make the AD in a saturated state all the time, which affects the forwarding effect of the system, therefore, AGC control needs to be carried out in the transceiver, and generally, according to the calculation mode of AGC control quantity, the AGC control can be divided into analog AGC and digital AGC. In the embodiment of the present invention, a digital AGC manner as shown in fig. 9 is adopted, and closed-loop control of the attenuation amount of the input signal is realized by an FPGA. The digital AGC is more flexible than analog AGC control.
In an embodiment of the present invention, the digital processing module 204 is configured as shown in fig. 10, and mainly completes digital transparent forwarding of signals, signal generation and broadcasting, data transmission of engineering telemetry, injection of reconstruction programs, measurement and control, beam pointing solution, and load management. Digital processing module adopts and integrates the design thinking, includes:
the digital-to-analog conversion sub-module 401 includes a high-speed ADC/DAC, where the high-speed ADC is configured to acquire an intermediate-frequency signal output by the down-conversion channel, and the high-speed DAC performs analog-to-digital conversion on a digital signal, where the high-speed ADC includes a main module and a backup module;
the FPGA 402 is connected with the digital-to-analog conversion sub-module in a communication mode and is used for performing digital filtering and frequency compensation on the signal output by the high-speed ADC and generating a broadcast signal;
a digital signal processing submodule DSP 403, wherein the DSP is communicably connected with the FPGA and is used for beam pointing calculation and load control;
the loading control circuit 404 is an F L ASH type FPGA which is insensitive to SEU, so that the loading control circuit 404 is required to be used to complete software reloading control of an SRAM type processing FPGA and a DSP and refresh control of anti-single-particle SEU by matching with an external PROM program memory 405 and an F L ASH memory 406;
and
and the control interface driving module 407 is configured to control the interfaces of the digital processing module 204, the storage module 003, the platform house keeping module, the frequency conversion module, the power supply module, and the phased array antenna of the satellite, so as to implement data interaction with the platform house keeping module, the frequency conversion module, and the phased array antenna, and control of the storage module data and the power supply module.
In one embodiment of the present invention, power for the transceiver 002 and the transceiving phased array antenna 101 is provided through the power module 205. The power module 205 receives the 12V bus of the satellite platform, and a specific interface circuit is shown in fig. 11. The output of the power module 205 includes a plurality of voltage types, such as analog +5V, digital +5V, -5V, +9V, and 12V, where the current of digital +5V is 5.5A, the current of analog +5V is 8.5A, the current of analog-5V is 1A, the current of 12V is 0.1A, and the current of 9V is 0.9A, and 2.7A at maximum. In order to adapt to different working modes of an antenna subsystem and the switching of a main backup of a frequency conversion channel, the power output needs to be controlled, and the method comprises the following steps:
when the transceiving phased array antenna 101 works, the power supply of the reflecting surface branch is turned off; and
when the reflector antenna 102 works, the power module still supplies power to the transceiving phased array antenna 101, and then the T/R component is turned off through phased array beamforming of the transceiving phased array antenna 101, so as to realize power-off of the transceiving phased array antenna 101.
To sum up, in the embodiment of the present invention, the principle of the transceiver 002 is as shown in fig. 12, and the power module 205 receives the 12V bus of the satellite platform and then provides power to other modules of the transceiver and the transceiving phased array antenna; the radio frequency signal of the receiving and sending phased array antenna and the radio frequency signal of the reflecting surface antenna after low noise amplification and filtering at the radio frequency front end are selected through the single-pole double-throw switch to carry out down conversion, then the radio frequency signal is converted into an analog signal through the high-speed ADC, the analog signal is processed through the FPGA to form a broadcast signal, meanwhile, the FPGA also reads data in the storage module to form the broadcast signal, the broadcast signal is converted into a digital signal through the high-speed DAC, the digital signal is converted into the radio frequency signal through up conversion, and then the radio frequency signal is transmitted through the single-pole double-throw switch to select the transmitting phased array antenna or the reflecting surface antenna, wherein if the reflecting surface antenna is selected to transmit, the signal still needs to be amplified through a.
The data stream of the storage module is as shown in fig. 13, which is separately distributed and measured by the satellite platform PCDU, the power supply is 5V power supply, the storage module 003 is a stand-alone module, so that it is powered by flying wire on L RM connector and fixed into the mounting plate, the satellite platform periodically writes satellite telemetry data into the storage module 003, the digital processing module 204 of the transceiver 002 in the power-on state reads the data of the storage module 003 according to the instruction of the satellite platform and broadcasts the data after coding modulation, wherein the interface of the storage module 003 and the satellite platform is a three-wire system synchronous RS422 interface, the control interface is a CAN bus, and the data transmission with the transceiver 002 is performed by using a three-wire system protocol.
The signal flow of the communication system in the embodiment of the present invention in different operation modes is shown in fig. 15 to 19, where:
fig. 15 shows a signal flow diagram in the broadcast mode of the communication system. The broadcast mode is to periodically send information such as satellite identity, position, broadcast frequency point, time, system state and the like to the ground station/terminal in a wide beam coverage mode. As shown in fig. 15, after the information enters the digital processing module 204 through the CAN bus, framing is performed first, the framed data is encoded, modulated, and filtered, then is subjected to DA conversion, and is subjected to up-conversion for 2 times by the up-conversion module 201 to be transmitted to the antenna subsystem 001 for transmission, and a phased array antenna or a reflector antenna CAN be selected and adopted by a transmission signal selection submodule composed of a single-pole double-throw switch;
fig. 16 shows a signal flow diagram in the transparent forwarding mode of the communication system. The transparent forwarding mode refers to that a satellite down-converts a radio frequency signal received from the antenna subsystem 001 through the down-conversion module 202 and then sends the radio frequency signal to the digital processing module 204 for acquisition, then the signal is filtered and processed in a software defined radio mode, then the radio frequency signal is subjected to DA conversion, and then the radio frequency signal is subjected to up-conversion for 2 times through the up-conversion module 201 and is sent to the antenna subsystem 001 for transmission, and a phased array antenna or a reflector antenna can be selected and adopted by a transmission signal selection submodule consisting of a single-pole double-throw switch;
fig. 17 shows a signal flow diagram in the communication system engineering telemetry data transmission mode. The engineering telemetry data transmission mode is that the communication system extracts a housekeeping telemetry data packet from a storage module 003 to a digital processing module 204, the digital processing module 204 performs framing, coding, modulation and filtering on data, performs DA conversion on the data, performs up-conversion for 2 times through an up-conversion module 201, transmits the data to an antenna subsystem 001 for transmission, and selects a phased array antenna or a reflector antenna through a transmission signal selection submodule consisting of a single-pole double-throw switch; fig. 18 shows a signal flow diagram in the note-up mode of the communication system. The upper note mode is used for realizing the update of the software version of the digital processing module. As shown in fig. 18, the communication system receives information and data required for version update in the form of radio frequency signals through the antenna subsystem 001, and then the radio frequency signals are subjected to analog-to-digital conversion and filtering by the digital processing module 204, and the filtered data are demodulated, decoded and then transmitted to the memory. In the top-fill mode, the single top-fill capability is 100MB, while the communication system also provides telemetry information in the top-fill mode. In addition, a phased array antenna or a reflector antenna can be selected and adopted by a receiving signal selection submodule consisting of a single-pole double-throw switch; and
fig. 19 shows a signal flow diagram in the measurement and control mode of the communication system. The measurement and control mode refers to the communication system sending the radio frequency signals received from the antenna subsystem 001 into the digital processing module 204 after down-conversion by the down-conversion module 202, collecting the received remote control signals, sending the received remote control signals to the platform house service after AD filtering and demodulation, processing the received remote control signals after the house service receives the data, returning the processed remote control signals to the digital processing module 204, modulating and filtering the remote control data of the platform, and then carrying out 2 times of up-conversion by the up-conversion module 201 to send the remote control signals to the antenna subsystem 001 for sending after DA conversion. The communication system adopts a wide beam for measurement and control, and adopts a USB measurement and control system. In addition, a phased array antenna or a reflector antenna can be selected and adopted by a receiving signal selection submodule and a sending signal selection submodule which are composed of single-pole double-throw switches.
While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. It will be apparent to persons skilled in the relevant art that various combinations, modifications, and changes can be made thereto without departing from the spirit and scope of the invention. Thus, the breadth and scope of the present invention disclosed herein should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.
Claims (10)
1. A communication system for a small communication satellite configured to be capable of being disposed on a satellite platform of the communication satellite, comprising:
an antenna subsystem including a transceiving phased array antenna and a reflector antenna, the antenna subsystem configured to receive signals transmitted from a satellite communications ground station and to transmit specified data to a specified satellite communications ground station;
the transceiver is configured to receive the radio-frequency signals of the antenna subsystem, process the radio-frequency signals, or respond to satellite commands to form designated data and send the designated data to the antenna subsystem, and the transceiver comprises a frequency conversion module, a frequency source module and a digital processing module; and
a storage module communicatively coupled to the satellite platform and the transceiver, the storage module configured to store housekeeping telemetry data of the communication satellite, the housekeeping telemetry data being encoded and modulated by the transceiver to form designated data and then broadcast downward via the antenna subsystem.
2. The communication system of claim 1, wherein the transceiving phased array antenna is a transceiving phased array antenna system, and adopts a tiled high-density hybrid integration mode, and comprises a 48-element receiving phased array antenna and a 32-element transmitting phased array antenna.
3. The communication system of claim 1, wherein the reflector antenna is a cassegrain reflector antenna comprising:
a ring focus reflecting surface configured to focus a beam of a specified frequency band;
a corrugated horn feed configured to primary illuminate the reflector antenna; and
a microwave network configured to form a circular polarization of the antenna and to separate the transceived signals.
4. The communication system of claim 1, wherein the frequency conversion module comprises:
the down-conversion channel is configured to convert the radio frequency line signal received from the antenna subsystem to an intermediate frequency signal twice, and adopts a cold backup mode and comprises a main down-conversion channel and a backup down-conversion channel;
the up-conversion channel is configured to convert the intermediate frequency signal output by the digital processing module to a radio frequency signal twice, adopts a cold backup mode and comprises a main up-conversion channel and a backup up-conversion channel; and
a signal selection module comprising:
a received signal selection submodule, connected to an input of the down-conversion channel, configured to select an input signal of the down-conversion channel, the received signal selection submodule including two single-pole double-throw switches; and
and the transmission signal selection submodule is connected with the output end of the up-conversion channel and is configured to select an antenna for transmitting the broadcast signal, and the transmission signal selection submodule comprises two single-pole double-throw switches.
5. The communication system of claim 4, further comprising a radio frequency front end disposed between the reflector antenna and the down-conversion channel configured to filter and low noise amplify radio frequency signals transmitted by the reflector antenna, and a power amplifier disposed between the up-conversion channel and the reflector antenna configured to amplify output signals transmitted to the reflector.
6. The communication system of claim 1, wherein the digital processing module is an integrated design comprising:
the digital-to-analog conversion sub-module comprises a digital-to-analog conversion ADC and an analog-to-digital conversion DAC, the digital-to-analog conversion ADC is configured to collect intermediate frequency signals output by the frequency conversion module, and the digital-to-analog conversion ADC comprises a main module and a backup module;
the FPGA is connected with the digital-to-analog conversion sub-module in a communication mode and is configured to perform digital filtering and frequency compensation on the signal output by the digital-to-analog conversion ADC and generate a broadcast signal;
a digital signal processing sub-module DSP which is connected with the FPGA in a communication way and is configured to carry out beam pointing solution and load control; and
a load control circuit configured to control software reloading of the SRAM type processing FPGA and DSP in cooperation with an external PROM program memory and F L ASH memory.
7. The communication system of claim 1, further comprising a power module configured to receive the 12V bus of the satellite platform, output analog +5V, digital +5V, -5V, +9V, 12V voltages, and provide power to the transceiving phased array antenna and transceiver.
8. The communication system of claim 1, wherein the storage module has a storage capacity greater than 12 GB.
9. The communication system of claim 1, wherein the storage module communicates data with the satellite platform via a three-wire synchronous RS422 protocol, communicates data with the transceiver via a three-wire L VDS protocol, and the satellite platform controls the storage module via a CAN bus.
10. The communication system of claim 1, wherein the memory module is powered using 5V power, separately powered by the satellite platform, over the fly and secured into a mounting plate on an L RM connector.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111953440A (en) * | 2020-08-25 | 2020-11-17 | 电子科技大学 | Radio frequency interconnection system and method for testing satellite mobile communication system |
| CN112564763A (en) * | 2020-11-23 | 2021-03-26 | 中国人民解放军国防科技大学 | Universal digital satellite load hardware platform |
| CN112909551A (en) * | 2021-02-24 | 2021-06-04 | 重庆两江卫星移动通信有限公司 | Wave beam control system of communication-in-moving phased array antenna |
| CN113179117A (en) * | 2021-04-20 | 2021-07-27 | 长光卫星技术有限公司 | High speed data transmission system for satellite |
| CN113438013A (en) * | 2021-06-30 | 2021-09-24 | 上海航天测控通信研究所 | Satellite data transmission and broadcast data distribution integrated device |
| CN115051721A (en) * | 2022-08-17 | 2022-09-13 | 中国人民解放军国防科技大学 | Multi-channel radio frequency receiving signal processing method and system based on software definition |
| CN116527114A (en) * | 2023-05-16 | 2023-08-01 | 上海航天空间技术有限公司 | Satellite measurement and control high-speed data transmission high-speed uploading integrated system |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6941106B1 (en) * | 2002-10-28 | 2005-09-06 | Prime Electronics & Statellitcs, Inc. | Structure for reducing intermodulation interference in satellite signal transmission |
| JP2010102865A (en) * | 2008-10-22 | 2010-05-06 | Nec Engineering Ltd | Latching relay |
| CN102843178A (en) * | 2012-07-27 | 2012-12-26 | 航天东方红卫星有限公司 | Spread spectrum relay measurement and control system compatible with standard unified S-band measurement and control system |
| CN104301058A (en) * | 2014-09-12 | 2015-01-21 | 上海卫星工程研究所 | Multi-code-rate multi-channel multi-system measurement and control system of microsatellite |
| CN205901948U (en) * | 2016-07-29 | 2017-01-18 | 四川赛狄信息技术有限公司 | Machine carries transceiver |
| CN106559128A (en) * | 2016-10-14 | 2017-04-05 | 上海微小卫星工程中心 | For the integrated communication device and method of microsatellite |
| WO2018088786A1 (en) * | 2016-11-08 | 2018-05-17 | Samsung Electronics Co., Ltd. | Apparatus and method for receiving a signal in wireless communication system |
| CN108199766A (en) * | 2018-04-08 | 2018-06-22 | 上海航天测控通信研究所 | A kind of spaceborne answering machine of goods-shelf type |
| CN109361052A (en) * | 2018-10-30 | 2019-02-19 | 苏州科可瑞尔航空技术有限公司 | A kind of chip double frequency onboard satellite communication antenna |
| CN109450519A (en) * | 2018-10-30 | 2019-03-08 | 航天东方红卫星有限公司 | A kind of spaceborne total digitalization USB answering machine |
| CN109765527A (en) * | 2018-12-11 | 2019-05-17 | 中国人民解放军63921部队 | A kind of S frequency range multi-channel high-accuracy space flight ranging answering machine |
| CN110040263A (en) * | 2019-03-28 | 2019-07-23 | 上海利正卫星应用技术有限公司 | CAN bus based microsatellite information system |
| CN209232944U (en) * | 2018-10-30 | 2019-08-09 | 苏州科可瑞尔航空技术有限公司 | A kind of chip double frequency onboard satellite communication antenna |
-
2020
- 2020-05-27 CN CN202010458669.0A patent/CN111478726B/en not_active Expired - Fee Related
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6941106B1 (en) * | 2002-10-28 | 2005-09-06 | Prime Electronics & Statellitcs, Inc. | Structure for reducing intermodulation interference in satellite signal transmission |
| JP2010102865A (en) * | 2008-10-22 | 2010-05-06 | Nec Engineering Ltd | Latching relay |
| CN102843178A (en) * | 2012-07-27 | 2012-12-26 | 航天东方红卫星有限公司 | Spread spectrum relay measurement and control system compatible with standard unified S-band measurement and control system |
| CN104301058A (en) * | 2014-09-12 | 2015-01-21 | 上海卫星工程研究所 | Multi-code-rate multi-channel multi-system measurement and control system of microsatellite |
| CN205901948U (en) * | 2016-07-29 | 2017-01-18 | 四川赛狄信息技术有限公司 | Machine carries transceiver |
| CN106559128A (en) * | 2016-10-14 | 2017-04-05 | 上海微小卫星工程中心 | For the integrated communication device and method of microsatellite |
| WO2018088786A1 (en) * | 2016-11-08 | 2018-05-17 | Samsung Electronics Co., Ltd. | Apparatus and method for receiving a signal in wireless communication system |
| CN108199766A (en) * | 2018-04-08 | 2018-06-22 | 上海航天测控通信研究所 | A kind of spaceborne answering machine of goods-shelf type |
| CN109361052A (en) * | 2018-10-30 | 2019-02-19 | 苏州科可瑞尔航空技术有限公司 | A kind of chip double frequency onboard satellite communication antenna |
| CN109450519A (en) * | 2018-10-30 | 2019-03-08 | 航天东方红卫星有限公司 | A kind of spaceborne total digitalization USB answering machine |
| CN209232944U (en) * | 2018-10-30 | 2019-08-09 | 苏州科可瑞尔航空技术有限公司 | A kind of chip double frequency onboard satellite communication antenna |
| CN109765527A (en) * | 2018-12-11 | 2019-05-17 | 中国人民解放军63921部队 | A kind of S frequency range multi-channel high-accuracy space flight ranging answering machine |
| CN110040263A (en) * | 2019-03-28 | 2019-07-23 | 上海利正卫星应用技术有限公司 | CAN bus based microsatellite information system |
Non-Patent Citations (2)
| Title |
|---|
| 丁磊: "一种星载软件无线电***的高可靠智能重构方法", 《工程应用》 * |
| 丁磊: "一种星载软件无线电***的高可靠智能重构方法", 《工程应用》, 28 August 2018 (2018-08-28), pages 28 - 33 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111953440A (en) * | 2020-08-25 | 2020-11-17 | 电子科技大学 | Radio frequency interconnection system and method for testing satellite mobile communication system |
| CN112564763A (en) * | 2020-11-23 | 2021-03-26 | 中国人民解放军国防科技大学 | Universal digital satellite load hardware platform |
| CN112564763B (en) * | 2020-11-23 | 2022-11-01 | 中国人民解放军国防科技大学 | Universal digital satellite load hardware platform |
| CN112909551A (en) * | 2021-02-24 | 2021-06-04 | 重庆两江卫星移动通信有限公司 | Wave beam control system of communication-in-moving phased array antenna |
| CN112909551B (en) * | 2021-02-24 | 2023-02-03 | 重庆两江卫星移动通信有限公司 | Wave beam control system of communication-in-moving phased array antenna |
| CN113179117A (en) * | 2021-04-20 | 2021-07-27 | 长光卫星技术有限公司 | High speed data transmission system for satellite |
| CN113438013A (en) * | 2021-06-30 | 2021-09-24 | 上海航天测控通信研究所 | Satellite data transmission and broadcast data distribution integrated device |
| CN115051721A (en) * | 2022-08-17 | 2022-09-13 | 中国人民解放军国防科技大学 | Multi-channel radio frequency receiving signal processing method and system based on software definition |
| CN116527114A (en) * | 2023-05-16 | 2023-08-01 | 上海航天空间技术有限公司 | Satellite measurement and control high-speed data transmission high-speed uploading integrated system |
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