An x-band spaceborne phase-locked receiver

Abstract

The invention provides an X-band satellite-borne phase-locked receiver. The X-band satellite-borne phase-locked receiver comprises a receiving link front end, a main phase discriminator, a loop filter and a voltage-controlled oscillator and further comprises a loop gain control device, wherein the receiving link front end is used for inputting a received signal, performing down-conversion of the received signal according to a frequency conversion reference signal output by the voltage-controlled oscillator, and outputting an intermediate-frequency signal; the main phase discriminator is used for receiving the intermediate-frequency signal and the frequency conversion reference signal, performing phase discrimination of the intermediate-frequency signal according to the frequency conversion reference signal, and outputting a direct-current voltage signal and an alternating-current difference beat signal to the loop filter; the loop filter is used for removing the alternating-current difference beat signal by filtration and outputting the direct-current voltage signal to the voltage-controlled oscillator; the voltage-controlled oscillator is used for outputting the frequency conversion reference signal under the control of the direct-current voltage signal; and the loop gain control device is used for performing phase discrimination of the phase-shift intermediate-frequency signal according to the frequency conversion reference signal, and controlling the direct-current gain of the loop filter to be increased when phases are same. By means of the X-band satellite-borne phase-locked receiver disclosed by the invention, the problems that the nondeterminacy of the selective static frequency of the X-band phase-locked receiver is relatively high and the scanning time of a ground measurement and control station is relatively long in the existing aerospace vehicle can be solved.

Description

technical field [0001] The invention belongs to satellite communication satellite-borne phase-locked receiving technology, in particular to an X-band receiving link satellite-borne phase-locked receiver. Background technique [0002] The transponder of the unified measurement and control system in the earth orbit satellite generally works in the S frequency band. In the deep space exploration systems such as the moon and Mars, according to the suggestion of the Space Data System Advisory Committee, both the uplink and downlink signals use the X frequency band. At present, all transponders in my country's unified measurement and control system adopt a phase-locked receiver structure, and the frequency is scanned by the ground station, and the transponder in the aerospace vehicle captures and tracks the signal. With the rapid development of aerospace missions, the requirements for the acquisition and tracking time of aerospace vehicles are getting higher and higher. It is nece...

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Problems solved by technology

[0004] The object to be solved by the present invention is to provide an X-band space-borne phase-locked receiver to solve the problem of large uncertainty in the selective static frequency of the X-band phase-locked receiver in existing aerospace vehicles and long scanning time of ground measurement and control stations. question

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