Coherent signal forwarding method for cube satellite measurement and control transponder
A cube satellite, coherent signal technology, applied in the field of satellite measurement and control communication, can solve the problems of unstable performance and large power consumption of the transponder, and achieve the effects of high temperature stability, low near-end noise, and high spectral purity
Inactive Publication Date: 2019-10-18
NANJING UNIV OF SCI & TECH
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Problems solved by technology
[0004] The object of the present invention is to provide a cube satellite measurement and control transponder and its coherent signal forwarding method, through direct sampling of the radio frequency of the received signal, FPGA digital processing, and digital-to-analog conversion, so that the transmitted UHF frequency signal carrier and the received VHF frequency signal Carrier coherence solves the problem of high power consumption and unstable performance of traditional medium and large satellite transponders, and provides a method for measuring the relative distance and speed between the satellite and the ground station for micro-satellites
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Embodiment 1
[0031] A CubeSat measuring and controlling transponder, the specific hardware selection is as follows:
[0032] Numbering name model factory 1 The first VHF band pass filter 1 RBP-140+ Mini-circuits 2 RF amplifier 2 EAR-8SM+ Mini-circuits 3 Second VHF band pass filter 3 RBP-140+ Mini-circuits 4 High-speed ADC4 AD9235 ADI 5 FPGA5 10M16DAF256I7 Altera 6 High-speed DAC6 AD9755 ADI 7 UHF Band Pass Filter 7 RBP-440+ Mini-circuits 8 Temperature compensated crystal oscillator TCXO8 62.500MHz MMDC
[0033] The VHF band antenna is connected in series with the first VHF band pass filter RBP-140+1, the radio frequency amplifier EAR-8SM+2, and the second VHF band pass filter RBP-140+3; the high-speed ADC AD92354 is connected with the second VHF respectively Band-pass filter RBP-140+3 is connected to FPGA 10M16DAF256I75, FPGA 10M16DAF256I75 is connected to high-speed DAC AD97556 and 62.500MHz temperature-compensated crystal oscillator TCXO8, high-speed DAC AD97556 is finally connected to U...
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The invention discloses a cubic satellite measurement and control responder and a coherent signal forwarding method thereof, wherein the method comprises the following steps of performing direct sampling on the radio frequency of a received signal, FPGA digital processing, and digital-to-analogue conversion, wherein the output transmitted signal is coherent with the received signal; the respondercomprises a VHF frequency band antenna, a first VHF band-pass filter, a radio frequency amplifier, a second VHF band-pass filter, a high-speed ADC, an FPGA, a high-speed DAC, a UHF band-pass filter and a temperature compensation crystal oscillator TCXO; the problem that a traditional middle-large-sized satellite responder is large in power consumption and unstable in performance is solved; and a relative distance and speed measuring method for the satellite and the ground station is provided for the microsatellite. According to the responder and the method in the invention, the frequency spectrum near-end noise of the forwarded signal is low, the spectrum purity is high, and the speed measurement accuracy is only related to the reference frequency stability and the forwarding noise of theground station, so the speed measuring precision is high; in addition, a full-digitalization mode processing is adopted after radio frequency sampling is carried out, so that the temperature stabilityis higher than that of an analog circuit.
Description
Technical field [0001] The invention relates to the field of satellite measurement and control communication, in particular to a cube satellite measurement and control transponder and a coherent signal forwarding method thereof. Background technique [0002] The CubeSat is a micro-nano satellite with a size of 10cm×10cm×10cm cube modules or a combination thereof. It has the characteristics of small size, low cost, and standardization. Satellite measurement and control transponder is the equipment responsible for the communication between satellites and the ground. In addition to completing the function of satellite and ground data communication, an important function of the measurement and control transponder is to coherently forward the ranging signal transmitted by the ground station. The so-called coherent forwarding refers to that the downlink signal carrier transmitted by the satellite is coherent with the uplink signal carrier of the ground station received by the satellite...
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IPC IPC(8): H04B1/59G05B19/042
Inventor 莫乾坤刘文政陈巡
Owner NANJING UNIV OF SCI & TECH