CN117478199A - High-orbit remote sensing satellite multi-frequency-band high-fusion transmission system - Google Patents
High-orbit remote sensing satellite multi-frequency-band high-fusion transmission system Download PDFInfo
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Abstract
The utility model provides a high-frequency channel high fusion transmission system of high-orbit remote sensing satellite, the realization is high-speed to fixed station transmission, on-board real-time processing broadcast and fixed station up-conversion broadcast high fusion, through the on-orbit information processing technique, directly broadcast the key information of extracting to the mobile receiving station or this satellite directly receive the ground station after handling information transfer to the mobile receiving station, the problem that traditional remote sensing satellite download data is broadcast to the mobile receiving station through special relay satellite according to the satellite priority after carrying out information processing through the ground station again has been solved, the integrated level of system has been promoted, the timeliness and the convenience of each receiving station application data obtain very big improvement, key data application latency is from the small hour level to the second level. The system high complexity and the high demands on resources such as satellite weight, power consumption, layout space and control and the like caused by multiple antennas are reduced by the technology of sharing the Ka frequency band uplink, K frequency band downlink and Ku downlink frequency band data transmission antennas.
Description
Technical Field
The invention relates to a high-frequency-band high-fusion transmission system of a high-orbit remote sensing satellite, which belongs to the field of satellite data processing and transmission, and can be used for realizing high-speed ground transmission, and extracting key data for real-time broadcasting or receiving ground-injected key data for broadcasting in a satellite system, so that the timeliness of wide application of the satellite data is greatly improved, and the system integration level is improved.
Background
With the continuous development of high-resolution satellite technology, the amount of remote sensing data to be transmitted is also increased, and the time for transmitting to a ground fixed receiving station is prolonged. Meanwhile, the common satellite transmission system is only configured with a ground or relay transmission system, the data is processed by the ground fixed receiving stations and then broadcast to the mobile receiving stations through the special relay satellites according to the sequence priority, the resource coordination among satellites is complex, and the timeliness of key information reaching each mobile receiving station is greatly reduced. Therefore, how to timely transmit the key information acquired by the remote sensing satellite to each of the wide mobile receiving stations becomes a key problem.
A high-orbit remote sensing satellite data transmission system and method (application number: CN 202111439400.9) introduce that by preparing satellite-ground communication answering machine, the actual rain attenuation condition of the ground can be known in real time and coordinated with the ground receiving system to determine the proper transmission rate, and the rate adjustment information is transmitted to a modulating transmitter to establish a satellite-ground link with adjustable rate with the ground, so that the problems that the data transmission rate is difficult to be improved due to low probability of heavy rainfall, and the data transmission system cannot be used under the heavy rainfall are solved, and the survivability of the high-orbit data transmission system is improved. The invention solves the problem that the transmission rate of a data transmission system under the conditions of Ka frequency band and higher frequency band is limited by the large attenuation of satellite-ground channels with the ground atmospheric rain attenuation, and provides no method for timely transmitting key data to fixed and mobile receiving stations aiming at remote sensing satellites.
A satellite-borne four-channel Ka frequency band data transmission channel system (application number: CN 202110639820.5) introduces a large-broadband high-speed data transmission channel with Ka frequency band four-channel corresponding to 4 frequency points for realizing timely downloading of massive load data within limited visible time of satellite and earth.
A satellite-borne Ka frequency band high-speed data transmission system (application number: CN 202210003992.8) introduces a design thought of combining frequency division multiplexing and polarization multiplexing, and enables the transmission quantity of data to the ground to be increased in multiple in unit time. Meanwhile, the effective time of satellite-ground link transmission is increased by utilizing the characteristic of two-dimensional rotating antenna double-station relay. The invention solves the problems that the transit time of the low-orbit satellite is short and the high-capacity load data cannot be transmitted to the ground in real time, can effectively improve the transmission efficiency between the satellites and the ground, and reduces the requirement on the transmission time between the satellites and the ground.
"Ka-band satellite high-speed data transmission system and method (application number: CN 202210316239.4)". An integrated system scheme and a radio frequency allocation scheme for transmitting data to the ground and the relay by using a Ka frequency band and an adaptive transmission scheme for baseband data are introduced, so that equipment compatible design and frequency sharing for transmitting the data to the ground and the relay and adaptive capability for various baseband data rates are realized. The system is flexible and changeable in configuration, can support various working modes, and remarkably improves the integration level and the data transmission rate of the system.
The common characteristics of the researches are that the transmission efficiency of remote sensing data is improved through increasing the number of radio frequency channels, adopting frequency division multiplexing, adopting polarization multiplexing, integrating ground and relay data transmission, regulating transmission modes of satellite-ground closed loop links and other different dimensions, the timeliness of key data descending to a fixed or mobile receiving station is improved through adopting methods of on-orbit data processing and broadcasting, ground uplink data forwarding broadcasting and the like, and the system integration level is improved through adopting a three-frequency system fusion technology. Therefore, there is a need for developing data transmission system research for data transmission, broadcasting and forwarding multi-frequency high fusion.
Disclosure of Invention
The technical solution of the invention is as follows: the defect of the prior art is overcome, and the multi-frequency-band high-fusion transmission system for the high-orbit remote sensing satellite is provided, so that the timeliness of key information application is greatly improved.
The technical scheme of the invention is as follows: a high-orbit remote sensing satellite multi-band highly-fused transmission system, comprising: baseband processing module, K frequency channel data transmission passageway, data transmission antenna module and Ku frequency channel broadcast/Ka-Ku frequency channel forward passageway, wherein:
the baseband processing module is used for completing recording and playback of the original load data, carrying out on-orbit information processing based on the original load data, carrying out framing, CRC (cyclic redundancy check), encoding and scrambling processing on key information obtained after the original load data and the on-orbit information processing, controlling on-off and mode switching of equipment in a transmission system, and collecting telemetry of corresponding equipment;
the K frequency band data transmission channel generates a local K frequency band carrier signal, modulates baseband data to the K frequency band, completes signal amplification and filtering after modulation, and realizes cross backup with the data transmission antenna module;
the data transmission antenna module is used for receiving satellite attitude signals and ground pointing information, controlling different antennas to point to a fixed receiving station or a broadcasting area, receiving uplink Ka frequency band signals and radiating K, ku frequency band signals to different areas on the ground;
the method comprises the steps of generating a local Ku frequency band carrier signal by a Ku frequency band broadcast/Ka-Ku frequency band forwarding channel, modulating key information to the Ku frequency band after on-orbit information processing, or converting a ground uplink Ka frequency band signal to the Ku frequency band, completing selection of a modulated signal and a converted signal, amplifying and filtering in a time sharing mode, and realizing cross backup with a data transmission antenna module.
Preferably, the baseband processing module includes: the system comprises a data processor, a solid-state memory, a load information processing unit and a data transmission control unit; wherein,
the data processor is used for receiving the load original data and forwarding the data to the load information processing unit; after buffering and framing of the load original data are completed, the load original data are sent to a solid-state memory for storage, playback data of the solid-state memory or the load original data buffered and framed are received, rate control and coding data processing are completed, baseband data are obtained, and the baseband data are sent to a K-band data transmission channel; after framing, rate control, CRC check, coding and scrambling treatment are carried out on key information sent by a received load information processing unit, the key information after treatment is sent to a Ku frequency band broadcast/Ka-Ku frequency band forwarding channel;
the solid-state memory is used for receiving the data buffered and framed by the data processor and finishing recording, file management, rate control and playback processing;
the load information processing unit is used for receiving the load original data forwarded by the data processor, finishing on-orbit information processing and sending the extracted key information to the data processor;
the data transmission control unit is used for controlling the on-off state and mode switching of other equipment of the transmission system after receiving the analysis of the bus control instruction sent by the satellite comprehensive control system, and collecting the telemetering of the equipment and sending the telemetering to the satellite comprehensive control system through the bus.
Preferably, the K-band data transmission channel includes: the device comprises a K-band microwave direct modulator, a K-band microwave component, a K-band traveling wave tube amplifier, a K-band waveguide filter and a K-band waveguide switch; wherein,
the K frequency band microwave direct modulator is used for receiving the baseband data output by the data processor, directly modulating microwaves by using a locally generated K frequency band carrier wave and outputting K frequency band modulation signals with different modulation modes and modulation rates;
the K-band microwave component receives the K-band modulation signal and performs power division and filtering to obtain a K-band microwave signal;
the K-band traveling wave tube amplifier is used for completing the amplification of the K-band microwave signals;
the K frequency band waveguide filter is used for completing the filtering of the amplified K frequency band signals, restraining signals outside the main lobe bandwidth and sensitive frequency points of other satellite equipment, and sending the processed results to the K frequency band waveguide switch;
and the K frequency band waveguide switch realizes the cross backup between the K frequency band data transmission channel and the data transmission antenna module.
Preferably, the Ku frequency band broadcast/Ka-Ku frequency band forwarding channel includes: the device comprises a Ka frequency band waveguide switch, a Ka-Ku receiver, a Ku frequency band microwave direct modulator, a Ku frequency band microwave component, a Ku frequency band traveling wave tube amplifier, a Ku frequency band waveguide filter and a Ku frequency band waveguide switch; wherein,
the Ka frequency band waveguide switch realizes the cross backup between the uplink Ka frequency band forwarding signal of the Ku frequency band broadcasting/Ka-Ku frequency band forwarding channel and the data transmission antenna module;
the Ka-Ku receiver receives the uplink Ka frequency band forwarding signal, and outputs a Ku frequency band signal to the Ku frequency band microwave component after filtering, amplifying and frequency conversion treatment;
the Ku frequency band microwave direct modulator is used for receiving key information processed and output by the baseband processing module, directly modulating microwaves by using locally generated Ku frequency band carrier waves, and outputting Ku frequency band modulation signals with different rates after QPSK modulation to the Ku frequency band microwave component;
the Ku frequency band microwave component is used for completing the combination and filtering of the received Ku frequency band signals or Ku frequency band modulation signals to obtain Ku frequency band microwave signals;
the Ku frequency band traveling wave tube amplifier is used for completing the amplification of the Ku frequency band microwave signals;
the Ku frequency band waveguide filter is used for completing the filtering of the amplified Ku frequency band signals, restraining signals outside the main lobe bandwidth and sensitive frequency points of other satellite equipment, and sending the processing result to the Ku frequency band waveguide switch;
the Ku frequency band waveguide switch realizes the cross backup between the downlink broadcast signal of the Ku frequency band broadcast/Ka-Ku frequency band forwarding channel and the data transmission antenna module.
Preferably, the data transmission antenna module includes: a data transmission antenna assembly and a servo controller; wherein,
the data transmission antenna assembly is used for completing the receiving of uplink Ka frequency band forwarding signals, completing the sending of K frequency band high-speed data transmission downlink signals and Ku frequency band broadcast downlink signals, and receiving a control instruction of the servo controller to perform triaxial rotation;
and the servo controller is used for receiving satellite attitude information and ground preset position information, calculating the triaxial rotation angle of the antenna and driving the data transmission antenna assembly to complete corresponding rotation.
Preferably, the data transmission antenna assembly comprises a reflecting surface assembly, a feed source assembly and a radio frequency channel;
the feed source assembly comprises a multi-frequency loudspeaker, a Ku frequency band splitter, a K frequency band splitter, a feed source assembly Ku component, a feed source assembly K downlink component and a feed source assembly Ka uplink component;
the reflecting surface assembly adopts a ring focal reflecting surface antenna and takes a Ku/K/Ka multi-frequency loudspeaker as a primary feed source;
the feed source component Ku filters Ka/K frequency band interference signals from a Ku frequency band broadcast downlink signal received from a radio frequency channel to form required circular polarization, and then a Ku frequency band wave splitter extracts the Ku signal therefrom and sends the Ku signal to a multi-frequency loudspeaker;
a K downlink component of the feed source component filters Ka uplink interference signals from K frequency band high-speed data transmission downlink signals received from the radio frequency channel to form required circular polarization, and then the K downlink signals are extracted by a K frequency band wave separator and sent to a multi-frequency loudspeaker;
the Ka uplink component of the feed source component receives uplink Ka frequency band forwarding signals from the multi-frequency loudspeaker and sends the uplink Ka frequency band forwarding signals to the radio frequency channel.
Preferably, the K downlink component of the feed source assembly comprises a K low-pass filter, a K downlink branch waveguide, a K downlink splitter, a K downlink circular polarizer and a K downlink load;
the K downlink circular polarizer forms a right-hand circular polarization signal according to the received K frequency band high-speed data transmission downlink signal, a left-hand polarization port is connected with a K downlink load, the K downlink circular polarizer is divided into four paths of signals with equal amplitude through a K downlink branching device, and the four paths of signals are coupled to the K frequency band branching device through a K downlink branching waveguide with equal length and the same K low-pass filter to form one path; the K low-pass filter adopts a waveguide stub filter.
Preferably, the feed source assembly Ku component comprises a Ku low-pass filter, a Ku downstream shunt, a Ku bridge and a Ku load;
the Ku bridge receives a Ku frequency band broadcast downlink signal to form a required right-hand circularly polarized signal, a left-hand polarization port is connected with a Ku downlink load, the Ku downlink signal is divided into four paths of signals with equal amplitude through a Ku downlink branching device, and each path of signal is coupled to a Ku frequency band branching device through a Ku low-pass filter and is one path; the Ku low-pass filter adopts an island filter.
Preferably, the Ka uplink component of the feed source component comprises a Ka uplink circular polarizer and a Ka uplink load;
the Ka uplink circular polarizer receives uplink Ka frequency band forwarding signals from the multi-frequency loudspeaker to form a required left-hand circular polarization signal, and a right-hand polarization port is connected with a Ka uplink load; the Ka uplink circular polarizer adopts a baffle polarizer.
Preferably, the multi-frequency horn is in the form of a choke groove horn.
The beneficial effects of the invention compared with the prior art are as follows:
according to the invention, based on a traditional K-band high-speed data transmission system, the problem that the traditional remote sensing satellite downloaded data is transmitted to a mobile receiving station through the Ku-band broadcast channel of a special relay satellite according to the satellite priority after being processed by a ground station is solved by adding the Ku-band broadcast/Ka-Ku-band forwarding channel, the integration level of the system is improved, the timeliness and convenience of each receiving station in applying the data are greatly improved, and the key data application waiting time is reduced from a small hour level to a second level.
According to the method, the Ku frequency band traveling wave tube amplifier and the Ku frequency band waveguide filter are shared in a time sharing mode under different modes of Ku frequency band broadcasting and Ka-Ku frequency band forwarding, so that the complexity of the system is reduced.
The method realizes the high-reliability passive cross and narrow bandwidth and high out-of-band rejection band-pass filtering of the Ku frequency band signals output to the Ku frequency band traveling wave tube amplifier by the Ku frequency band microwave direct modulator or the Ka-Ku receiver by adopting a waveguide crack bridge and circular cavity dual-mode band-pass filter combination mode in the Ku frequency band microwave assembly.
The method of the invention realizes that one antenna can adapt to three frequency bands for transmission by sharing three transmission frequency bands of the Ku frequency band, the K frequency band and the Ka frequency band of the main reflector, the auxiliary reflector and the multi-frequency horn in the data transmission antenna assembly, the feed source assembly adopts three frequency bands for high integration, the two data transmission antenna assemblies with the same design can realize the backup of the two data transmission antenna assemblies for different frequency bands, and the data transmission antenna assemblies can be respectively used as the downlink of the K frequency band of a fixed station and the uplink of the Ka frequency band or the broadcast of the Ku frequency band of a broadcast mobile station under different postures of a satellite, thereby improving the reliability and the flexibility of the system; meanwhile, the system complexity caused by independent configuration of the antennas in the traditional different frequency bands is avoided, the total weight of the antennas and the power consumption requirement are large, the layout of multiple antennas is difficult, and the problem of backup between the antennas is avoided.
Drawings
FIG. 1 is a block diagram of a system module level architecture of the present invention;
FIG. 2 is a block diagram of a system of the present invention in detail;
fig. 3 is a radio frequency signal flow diagram of a data transmission antenna assembly.
Detailed Description
The present invention is described in further detail below with reference to FIGS. 1-3 and the detailed description.
As shown in fig. 1, the invention discloses a multi-band highly-fused transmission system of a high-orbit remote sensing satellite, which comprises a baseband processing module, a K-band data transmission channel, a data transmission antenna module and a Ku-band broadcast/Ka-Ku band forwarding channel, and the above devices are explained in detail with reference to fig. 2.
1. Baseband processing module
The baseband processing module is used for completing recording and playback of the original load data, carrying out on-orbit information processing based on the original load data, carrying out framing, CRC checking, encoding and scrambling processing on key information obtained after the original load data and the on-orbit information processing, controlling the on-off of other devices except a data transmission control unit in a transmission system, carrying out mode switching (switching through a secondary bus instruction) on different transmission rates of a fixed station and different transmission rates and different slice scales of a mobile station, and simultaneously collecting telemetry of other devices except the data transmission control unit in the transmission system.
A baseband processing module comprising: a data processor 1, a solid-state memory 2, a load information processing unit 3 and a data transmission control unit 4; wherein,
a data processor 1 for receiving the payload raw data (including image data transmitted by different spectrum cameras, platform auxiliary data, etc.), and forwarding the data to a payload information processing unit 3 via a TLK2711 data interface; after finishing the buffering and framing of the data, sending the data to the solid-state memory 2 for storage, receiving the playback data of the solid-state memory 2 or the load original data of the buffering and framing to finish the rate control and the coding data processing, obtaining the baseband data, and sending the baseband data to the K frequency band microwave direct modulator 5 at different rates; after framing, rate control, CRC check, encoding and scrambling processing are carried out on key information sent by the received load information processing unit, the processed key information is sent to the Ku frequency band microwave direct modulator 12 at different rates.
And the solid-state memory 2 receives the data buffered and framed by the data processor through a TLK2711 data interface, and finishes the processing of recording, file management, rate control, playback and the like.
The load information processing unit 3 receives the load original data forwarded by the data processor through the TLK2711 data interface, completes on-orbit information processing, and sends the extracted key information to the data processor 1 through the LVDS data interface.
The data transmission control unit 4 receives the bus control instruction sent by the satellite comprehensive control system through the primary 1553B bus, controls the on-off of other devices except the data transmission control unit of the transmission system and the mode switching of different transmission rates of a fixed station, different transmission rates of a mobile station and different slice scales after analysis, collects the state quantity, analog quantity and secondary bus telemetry of the other devices except the data transmission control unit, and sends the state quantity, analog quantity and secondary bus telemetry to the satellite comprehensive control system through the primary 1553B bus.
2. K frequency band data transmission channel
K frequency band data transmission channels are used for generating carrier signals of a local K frequency band, the data after baseband processing are modulated to the K frequency band at different speeds, the modulated signals are amplified and filtered and output, the waveguide switch is used for realizing cross backup with the data transmission antenna module 3, and the cross backup refers to the fact that the waveguide switch can be used for realizing multi-channel selection with the data transmission antenna module according to actual conditions.
The K-band data transmission channel 2 includes: the device comprises a K-band microwave direct modulator 5, a K-band microwave assembly 6, a K-band traveling wave tube amplifier 7, a K-band waveguide filter 8 and a K-band waveguide switch 9; wherein,
the K-band microwave direct modulator 5 receives the high-speed baseband data output by the data processor 1 through an LVDS data interface, uses a locally generated K-band carrier wave to carry out microwave direct modulation, and outputs K-band modulation signals with different modulation rates in a QPSK modulation mode.
And the K-band microwave component 6 receives the K-band modulation signal and performs passive power division and filtering to realize passive cross backup between the K-band microwave direct modulator 5 and the main backup of the K-band traveling wave tube amplifier 7.
And the K-band traveling wave tube amplifier 7 is used for amplifying the modulated K-band microwave signals.
And the K-band waveguide filter 8 is used for completing the filtering of the amplified K-band signals and inhibiting signals outside the main lobe bandwidth and sensitive frequency points of other satellite equipment.
And the K frequency band waveguide switch 9 realizes the cross backup between the K frequency band data transmission channel 2 and the data transmission antenna module 3.
3. Data transmission antenna module
The data transmission antenna module is used for receiving satellite attitude signals and ground pointing information, controlling different antennas to point to a fixed receiving station or a broadcasting area, receiving uplink Ka frequency band signals and radiating K frequency band and Ku frequency band signals to different areas on the ground.
The data transmission antenna module 3 includes: a data antenna assembly 17, a data antenna assembly 18, a servo controller 19 and a servo controller 20.
The data transmission antenna assembly 17 and the data transmission antenna assembly 18 are identical, the uplink Ka frequency band forwarding signal receiving is completed, the K frequency band high-speed data transmission downlink signal and the Ku frequency band broadcast downlink signal transmitting are completed, and the receiving servo controller controls the instruction to perform triaxial rotation.
The servo controller 19 and the servo controller 20 are identical, receive satellite attitude information and ground preset position information, calculate the triaxial rotation angle of the antenna, and drive the corresponding data transmission antenna assembly 17 and the data transmission antenna assembly 18 to complete corresponding rotation.
In a preferred embodiment of the invention, the data transmission antenna component adopts a ring focal reflecting surface antenna and uses a Ku/K/Ka multi-frequency loudspeaker as a primary feed source.
Preferably, the feed source assembly consists of a multi-frequency horn, a Ku frequency band splitter, a K frequency band splitter, a feed source assembly Ku component, a feed source assembly K downlink component and a feed source assembly Ka uplink component, and the radio frequency interface is a three-way radio frequency waveguide and a flange.
Preferably, the multi-frequency horn is in the form of a choke groove horn. The choke groove horn has a simple structure, can provide E-plane and H-plane directional diagrams with equal amplitude, is compact in structure, is close to the mouth surface, and is very suitable for a loop focal antenna feed source.
The Ku frequency band wave separator is used for extracting a Ku signal from a multi-frequency channel of the feed source assembly; the K-band wave separator is used for extracting K downlink signals from a K channel of the feed source assembly.
The feed source assembly Ku component filters Ka/K frequency band interference signals to form required circular polarization, and comprises a Ku low-pass filter, a Ku splitter, a Ku bridge, a load and related connecting waveguides. Preferably, the Ku low pass filter takes the form of an islands-in-the-sea filter having a well-matched broad pass band and highly attenuated broad stop band, and allows many higher order modes to be suppressed, acting as a high power filter. The Ku splitter, bridge and load realize control of the power and phase of the two orthogonal modes fed into the Ku splitter, so that the power is as equal as possible, the phase difference is 90 degrees, and the required right-hand circular polarization is formed.
The feed source component K downlink component filters Ka uplink interference signals to form required circular polarization and comprises a K low-pass filter, a K downlink branch waveguide, a K downlink splitter, a K downlink circular polarizer, a K downlink load and related connecting waveguides. Preferably, the K low-pass filter adopts a waveguide stub filter form, is a simpler waveguide filter form, and is easy to realize compact design; the circular polarizer adopts a partition plate polarizer mode, circular polarization amplitude-phase distribution in a wider frequency band can be realized, and port isolation is good. The K downlink circular polarizer forms a right-hand circular polarization signal, the left-hand polarization port is connected with a load, the right-hand circular polarization signal is divided into four paths of signals with equal amplitude through the K downlink branching device, and the four paths of signals are coupled to the K frequency band branching device through branching waveguides with equal lengths and the same K low-pass filter and are one path.
The Ka uplink component of the feed source component forms the required left-hand circular polarization, and comprises a Ka uplink circular polarizer, a Ka uplink load and related connecting waveguides. Preferably, the Ka upstream circular polarizer is in the form of a baffle polarizer, and the right-hand polarization port is connected with a load.
4. Ku frequency band broadcast/Ka-Ku frequency band forwarding channel
The method comprises the steps of generating a local Ku frequency band carrier signal by a Ku frequency band broadcast/Ka-Ku frequency band forwarding channel, modulating key data after on-orbit information processing to a Ku frequency band in different speed and different modulation modes, or frequency-converting a ground uplink Ka frequency band signal to the Ku frequency band, then completing the selection, amplification and filtering of the modulated signal and the frequency-converted signal and outputting the frequency-converted signal, and realizing the cross backup between a waveguide switch and a data transmission antenna module 3.
The Ku frequency band broadcast/Ka-Ku frequency band forwarding channel 4 comprises: a Ka frequency band waveguide switch 10, a Ka-Ku receiver 11, a Ku frequency band microwave direct modulator 12, a Ku frequency band microwave component 13, a Ku frequency band traveling wave tube amplifier 14, a Ku frequency band waveguide filter 15 and a Ku frequency band waveguide switch 16; wherein,
the Ka frequency band waveguide switch 10 realizes the cross backup between the uplink forwarding signal of the Ku frequency band broadcast/Ka-Ku frequency band forwarding channel 4 and the data transmission antenna module 3.
The Ka-Ku receiver 11 receives the uplink Ka band signal, filters, amplifies and frequency-converts the uplink Ka band signal, and outputs a Ku band signal.
The Ku frequency band microwave direct modulator 12 receives key load information processed and output by the load signal processing unit 3 and the data processor 1 through an LVDS data interface, uses a locally generated Ku frequency band carrier wave to carry out microwave direct modulation, and outputs Ku frequency band modulation signals with different rates after QPSK modulation.
The Ku frequency band microwave component 13 completes the combination and filtering of the modulated or variable-frequency Ku frequency band microwave signals, and achieves passive cross backup between the main backup of the Ku frequency band microwave direct modulator 5/Ka-Ku receiver 11 and the main backup of the Ku frequency band traveling wave tube amplifier 14. Preferably, the Ku frequency band microwave component consists of a waveguide crack bridge and a circular cavity dual-mode band-pass filter, wherein the waveguide crack bridge is used as a passive component to realize that Ku frequency band signal power output by a Ku frequency band microwave direct modulator or a Ka-Ku receiver is distributed to two output ports relatively evenly, and the circular cavity dual-mode band-pass filter is used as a waveguide filter with high Q value, has a compact structure, is easy to realize narrow-band bandwidth and realizes band-pass filtering of Ku frequency band signals.
The Ku frequency band traveling wave tube amplifier 14 completes the Ku frequency band modulation signal amplification.
The Ku frequency band waveguide filter 15 completes the filtering of the amplified Ku frequency band signals and suppresses signals outside the main lobe bandwidth and sensitive frequency points of other satellite equipment.
The Ku frequency band waveguide switch 16 realizes the cross backup between the downlink broadcast signal of the Ku frequency band broadcast/Ka-Ku frequency band forwarding channel and the data transmission antenna module.
Examples
The high-orbit remote sensing satellite multi-frequency-band highly-fused transmission system is added with a Ku frequency-band broadcast/Ka-Ku frequency-band forwarding channel 4 based on a baseband processing module 1, a K frequency-band data transmission channel 2 and a data transmission antenna module 3 of a traditional remote sensing satellite data transmission system, and the data transmission antenna component is used as a triaxial mechanical movable reflection surface antenna to realize the novel technical characteristics of Ku/K/Ka three-frequency multiplexing, high gain, long unfolding arm and the like.
The baseband processing module 1 is used for completing recording and playback of the original load data, carrying out on-orbit information processing based on the original load data, framing, CRC (cyclic redundancy check), 7/8LDPC (low density parity check) coding and scrambling processing on key data after the on-orbit information processing, controlling on-off and mode switching of each device of the transmission system, and collecting telemetry of each device. After the key information is extracted from the load original data, slice data with different pixel scales such as 1K, 2K, 4K and the like can be generated for the target, and track information of the related target can be generated.
The K frequency band data transmission channel 2 generates a carrier signal of a local K frequency band 19.XxGHz, the baseband processed data is modulated to the K frequency band in a QPSK modulation mode at the speed of 600Mbps/300Mbps, the modulated signal is amplified to 100W and then is filtered and output, and the WR51 waveguide switch realizes the cross backup with the data transmission antenna module 4.
The data transmission antenna module 3 receives satellite attitude signals and ground pointing information, controls different antennas to point to a fixed receiving station or a broadcasting area, receives uplink Ka frequency band 28.XxGHz signals, and radiates K frequency band signals with 19.XxGHz central frequency and 12.XxGHz central frequency of Ku frequency band to different areas on the ground.
The Ku frequency band broadcast/Ka-Ku frequency band forwarding channel 4 generates a local Ku frequency band 12.XXGHz carrier signal, key data is modulated to the Ku frequency band after on-orbit information processing, or a ground uplink Ka frequency band 28.XxGHz signal is converted to the Ku frequency band 12.XXGHz signal, so that the selection, 150W amplification and filtering of a modulated signal and a converted signal are completed, and the cross backup between the modulated signal and the data transmission antenna module 3 is realized.
The Ka frequency band waveguide switch 10 adopts a C-shaped waveguide switch with a WR75 waveguide port to realize the cross backup between the uplink forwarding signal of the Ku frequency band broadcast/Ka-Ku frequency band forwarding channel 4 and the data transmission antenna module 3. Center frequency: xxghz, operating bandwidth: 100MHz, in-band fluctuation less than or equal to 0.2dB, port isolation more than or equal to 60dB and electromagnetic leakage less than or equal to-65 dB.
The Ka-Ku receiver 11 receives the uplink Ka frequency band 28.XxGHz signal, outputs the Ku frequency band 12.XXGHz signal after filtering, amplifying and frequency conversion treatment, and inputs the signal with the input level of-90 dBm to-55 dBm and the receiving gain of 64dB.
The Ku band microwave direct modulator 12 receives key load information processed and output by the load signal processing unit 3 and the data processor 1 through an LVDS data interface, uses a locally generated Ku band 12.XXGHz carrier wave to carry out microwave direct modulation, and outputs Ku band modulation signals with different rates of 1Mbps/512kbps after QPSK modulation.
The Ku frequency band microwave component 13 completes the combination and filtering of the modulated and frequency-converted Ku frequency band 12.XXGHz microwave signals, and achieves passive cross backup between the main backup of the Ku frequency band microwave direct modulator 5/Ka-Ku receiver 11 and the main backup of the Ku frequency band traveling wave tube amplifier 14. The Ku frequency band microwave component consists of a waveguide crack bridge and a circular cavity dual-mode band-pass filter, and the power of a Ku frequency band signal output by a Ku frequency band microwave direct modulator or a Ka-Ku receiver is distributed to two output ports in a relatively average mode and is subjected to band-pass filtering. Center frequency: xxghz, operating bandwidth: 5MHz, the insertion loss of the center of a channel is less than or equal to 7.5dB, the in-band fluctuation is less than or equal to 0.1dB, the isolation of each port is more than or equal to 45dB, and the out-of-band inhibition is carried out: the inhibition at fc+/-100 MHz is more than or equal to 34dB, the standing wave ratio is less than or equal to 1.3, and the electromagnetic leakage is less than or equal to-65 dB.
The Ku frequency band traveling wave tube amplifier 14 completes the amplification of the Ku frequency band modulation signal 150W. Input frequency: xx±0.1GHz, input power: -50 to-20 dBm, saturated output power not less than 150W, gain flatness not more than 1.0 dBpp/in-band (saturation point) not more than 1.5 dBpp/in-band (small signal), and standing wave not more than 1.5.
The Ku frequency band waveguide filter 15 completes the filtering of the amplified Ku frequency band signals and suppresses signals outside the main lobe bandwidth and sensitive frequency points of other satellite equipment. Center frequency: xxghz, operating bandwidth: 100MHz, in-band fluctuation less than or equal to 0.2dB, in-band group delay fluctuation less than or equal to 0.5ns, out-band inhibition standing wave less than or equal to 1.5, out-of-band inhibition: fc + -300 MHz is greater than or equal to 40dB, out-of-band suppression: the frequency of the standing wave is more than or equal to 80dB at 18.5-21 GHz and 27.9-31 GHz, the standing wave is less than or equal to 1.5, and the electromagnetic leakage is less than or equal to-65 dB. .
The Ku frequency band waveguide switch 16 adopts a WR28 waveguide port C-shaped waveguide switch to realize the cross backup between the downlink broadcast signals of the Ku frequency band broadcast/Ka-Ku frequency band forwarding channel and the data transmission antenna module. Center frequency: xxghz, operating bandwidth: 100MHz, in-band fluctuation less than or equal to 0.2dB, port isolation more than or equal to 60dB and electromagnetic leakage less than or equal to-65 dB.
The data transmission antenna assembly 17 and the data transmission antenna assembly 18 are identical, and a ring focus reflecting surface antenna is adopted, wherein the feed source assembly consists of a multi-frequency horn, a Ku frequency band wave splitter, a K frequency band wave splitter, a feed source assembly Ku component, a feed source assembly K downlink component and a feed source assembly Ka uplink component, and the radio frequency interface is a three-way radio frequency waveguide and a flange. The multi-frequency horn adopts a choke groove horn form, the Ku low-pass filter adopts a group island filter form, the K low-pass filter adopts a waveguide stub filter form, and the circular polarizer adopts a baffle polarizer form. The data transmission antenna assembly receives a control instruction of the servo controller to perform triaxial rotation, receives an uplink Ka frequency band 28.XXGHz signal, completes uplink Ka frequency band 28.XXGHz signal receiving, and radiates K frequency band signals with the center frequency of 19.XXGHz and Ku frequency band center frequency of 12.XXGHz to different areas of the ground. Ka band uplink frequency: xxghz±5mhz, k band downlink frequency: xxghz±330mhz, ku band downlink frequency: xxghz±5mhz, ka band uplink polarization mode: left-hand circular polarization, K frequency band and Ku frequency band downlink polarization modes: right-hand circular polarization, ka frequency band uplink gain and K frequency band downlink gain: the beam center is more than or equal to 36dBi within the range of +/-0.4 degrees; ku band downlink gain: the beam center is more than or equal to 34dBi within the range of +/-0.4 degrees. The caliber of the main reflector of the data transmission antenna component is 0.75m, the length of the unfolding arm is 1.5m, and the total weight of the antenna component is 30kg.
For the purpose of simplifying the description, the disclosure of technical details in the foregoing specific embodiments may only be to the extent that those skilled in the art will self-determine that the technical details in the foregoing specific embodiments are not disclosed, i.e., those skilled in the art may fully utilize the technical solutions of the present invention without any inventive design, with the help of published documents such as papers, patents and textbooks, etc., or that these details are generally understood by those skilled in the art to make self-determination according to the actual situation. It can be seen that even if relevant technical details are not disclosed, the disclosure sufficiency of the technical scheme of the invention is not affected.
In general, any specific embodiment falling within the scope of the claims of the present invention is within the scope of the present invention, based on the interpretation of the claims in conjunction with the description of the invention.
Claims (10)
1. A high-orbit remote sensing satellite multi-band highly-fused transmission system, comprising: baseband processing module, K frequency channel data transmission passageway, data transmission antenna module and Ku frequency channel broadcast/Ka-Ku frequency channel forward passageway, wherein:
the baseband processing module is used for completing recording and playback of the original load data, carrying out on-orbit information processing based on the original load data, carrying out framing, CRC (cyclic redundancy check), encoding and scrambling processing on key information obtained after the original load data and the on-orbit information processing, controlling on-off and mode switching of equipment in a transmission system, and collecting telemetry of corresponding equipment;
the K frequency band data transmission channel generates a local K frequency band carrier signal, modulates baseband data to the K frequency band, completes signal amplification and filtering after modulation, and realizes cross backup with the data transmission antenna module;
the data transmission antenna module is used for receiving satellite attitude signals and ground pointing information, controlling different antennas to point to a fixed receiving station or a broadcasting area, receiving uplink Ka frequency band signals and radiating K, ku frequency band signals to different areas on the ground;
the method comprises the steps of generating a local Ku frequency band carrier signal by a Ku frequency band broadcast/Ka-Ku frequency band forwarding channel, modulating key information to the Ku frequency band after on-orbit information processing, or converting a ground uplink Ka frequency band signal to the Ku frequency band, completing selection of a modulated signal and a converted signal, amplifying and filtering in a time sharing mode, and realizing cross backup with a data transmission antenna module.
2. The high-orbit remote sensing satellite multi-band highly-fused transmission system according to claim 1, wherein: the baseband processing module includes: the system comprises a data processor, a solid-state memory, a load information processing unit and a data transmission control unit; wherein,
the data processor is used for receiving the load original data and forwarding the data to the load information processing unit; after buffering and framing of the load original data are completed, the load original data are sent to a solid-state memory for storage, playback data of the solid-state memory or the load original data buffered and framed are received, rate control and coding data processing are completed, baseband data are obtained, and the baseband data are sent to a K-band data transmission channel; after framing, rate control, CRC check, coding and scrambling treatment are carried out on key information sent by a received load information processing unit, the key information after treatment is sent to a Ku frequency band broadcast/Ka-Ku frequency band forwarding channel;
the solid-state memory is used for receiving the data buffered and framed by the data processor and finishing recording, file management, rate control and playback processing;
the load information processing unit is used for receiving the load original data forwarded by the data processor, finishing on-orbit information processing and sending the extracted key information to the data processor;
the data transmission control unit is used for controlling the on-off state and mode switching of other equipment of the transmission system after receiving the analysis of the bus control instruction sent by the satellite comprehensive control system, and collecting the telemetering of the equipment and sending the telemetering to the satellite comprehensive control system through the bus.
3. The high-orbit remote sensing satellite multi-band highly-fused transmission system according to claim 1, wherein: the K frequency band data transmission channel comprises: the device comprises a K-band microwave direct modulator, a K-band microwave component, a K-band traveling wave tube amplifier, a K-band waveguide filter and a K-band waveguide switch; wherein,
the K frequency band microwave direct modulator is used for receiving the baseband data output by the data processor, directly modulating microwaves by using a locally generated K frequency band carrier wave and outputting K frequency band modulation signals with different modulation modes and modulation rates;
the K-band microwave component receives the K-band modulation signal and performs power division and filtering to obtain a K-band microwave signal;
the K-band traveling wave tube amplifier is used for completing the amplification of the K-band microwave signals;
the K frequency band waveguide filter is used for completing the filtering of the amplified K frequency band signals, restraining signals outside the main lobe bandwidth and sensitive frequency points of other satellite equipment, and sending the processed results to the K frequency band waveguide switch;
and the K frequency band waveguide switch realizes the cross backup between the K frequency band data transmission channel and the data transmission antenna module.
4. The high-orbit remote sensing satellite multi-band highly-fused transmission system according to claim 1, wherein: the Ku frequency band broadcast/Ka-Ku frequency band forwarding channel comprises: the device comprises a Ka frequency band waveguide switch, a Ka-Ku receiver, a Ku frequency band microwave direct modulator, a Ku frequency band microwave component, a Ku frequency band traveling wave tube amplifier, a Ku frequency band waveguide filter and a Ku frequency band waveguide switch; wherein,
the Ka frequency band waveguide switch realizes the cross backup between the uplink Ka frequency band forwarding signal of the Ku frequency band broadcasting/Ka-Ku frequency band forwarding channel and the data transmission antenna module;
the Ka-Ku receiver receives the uplink Ka frequency band forwarding signal, and outputs a Ku frequency band signal to the Ku frequency band microwave component after filtering, amplifying and frequency conversion treatment;
the Ku frequency band microwave direct modulator is used for receiving key information processed and output by the baseband processing module, directly modulating microwaves by using locally generated Ku frequency band carrier waves, and outputting Ku frequency band modulation signals with different rates after QPSK modulation to the Ku frequency band microwave component;
the Ku frequency band microwave component is used for completing the combination and filtering of the received Ku frequency band signals or Ku frequency band modulation signals to obtain Ku frequency band microwave signals;
the Ku frequency band traveling wave tube amplifier is used for completing the amplification of the Ku frequency band microwave signals;
the Ku frequency band waveguide filter is used for completing the filtering of the amplified Ku frequency band signals, restraining signals outside the main lobe bandwidth and sensitive frequency points of other satellite equipment, and sending the processing result to the Ku frequency band waveguide switch;
the Ku frequency band waveguide switch realizes the cross backup between the downlink broadcast signal of the Ku frequency band broadcast/Ka-Ku frequency band forwarding channel and the data transmission antenna module.
5. The high-orbit remote sensing satellite multi-band highly-fused transmission system according to claim 1, wherein: the data transmission antenna module comprises: a data transmission antenna assembly and a servo controller; wherein,
the data transmission antenna assembly is used for completing the receiving of uplink Ka frequency band forwarding signals, completing the sending of K frequency band high-speed data transmission downlink signals and Ku frequency band broadcast downlink signals, and receiving a control instruction of the servo controller to perform triaxial rotation;
and the servo controller is used for receiving satellite attitude information and ground preset position information, calculating the triaxial rotation angle of the antenna and driving the data transmission antenna assembly to complete corresponding rotation.
6. The high-orbit remote sensing satellite multi-band highly-fused transmission system according to claim 5, wherein: the data transmission antenna assembly comprises a reflecting surface assembly, a feed source assembly and a radio frequency channel;
the feed source assembly comprises a multi-frequency loudspeaker, a Ku frequency band splitter, a K frequency band splitter, a feed source assembly Ku component, a feed source assembly K downlink component and a feed source assembly Ka uplink component;
the reflecting surface assembly adopts a ring focal reflecting surface antenna and takes a Ku/K/Ka multi-frequency loudspeaker as a primary feed source;
the feed source component Ku filters Ka/K frequency band interference signals from a Ku frequency band broadcast downlink signal received from a radio frequency channel to form required circular polarization, and then a Ku frequency band wave splitter extracts the Ku signal therefrom and sends the Ku signal to a multi-frequency loudspeaker;
a K downlink component of the feed source component filters Ka uplink interference signals from K frequency band high-speed data transmission downlink signals received from the radio frequency channel to form required circular polarization, and then the K downlink signals are extracted by a K frequency band wave separator and sent to a multi-frequency loudspeaker;
the Ka uplink component of the feed source component receives uplink Ka frequency band forwarding signals from the multi-frequency loudspeaker and sends the uplink Ka frequency band forwarding signals to the radio frequency channel.
7. The high-orbit remote sensing satellite multi-band highly-fused transmission system according to claim 6, wherein: the K downlink component of the feed source component comprises a K low-pass filter, a K downlink branch waveguide, a K downlink splitter, a K downlink circular polarizer and a K downlink load;
the K downlink circular polarizer forms a right-hand circular polarization signal according to the received K frequency band high-speed data transmission downlink signal, a left-hand polarization port is connected with a K downlink load, the K downlink circular polarizer is divided into four paths of signals with equal amplitude through a K downlink branching device, and the four paths of signals are coupled to the K frequency band branching device through a K downlink branching waveguide with equal length and the same K low-pass filter to form one path; the K low-pass filter adopts a waveguide stub filter.
8. The high-orbit remote sensing satellite multi-band highly-fused transmission system according to claim 6, wherein: the feed source component Ku comprises a Ku low-pass filter, a Ku downlink splitter, a Ku bridge and a Ku load;
the Ku bridge receives a Ku frequency band broadcast downlink signal to form a required right-hand circularly polarized signal, a left-hand polarization port is connected with a Ku downlink load, the Ku downlink signal is divided into four paths of signals with equal amplitude through a Ku downlink branching device, and each path of signal is coupled to a Ku frequency band branching device through a Ku low-pass filter and is one path; the Ku low-pass filter adopts an island filter.
9. The high-orbit remote sensing satellite multi-band highly-fused transmission system according to claim 6, wherein: the Ka uplink component of the feed source component comprises a Ka uplink circular polarizer and a Ka uplink load;
the Ka uplink circular polarizer receives uplink Ka frequency band forwarding signals from the multi-frequency loudspeaker to form a required left-hand circular polarization signal, and a right-hand polarization port is connected with a Ka uplink load; the Ka uplink circular polarizer adopts a baffle polarizer.
10. The high-orbit remote sensing satellite multi-band highly-fused transmission system according to claim 6, wherein: the multi-frequency loudspeaker adopts a choke groove loudspeaker form.
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