A multi-frequency switching system and method for miniaturized ka dual-frequency transmitter

Abstract

The invention relates to a multi-frequency switching system and method for a miniature Ka double-frequency transmitter. A sampling phase-locked technology and a manner of controlling digital phase locking and frequency mixing through a serial interface program are combined with a multi-CRO united switching technology. In the scheme, a low-phase-noise point frequency source after being sampled and phase-locked is used as a local oscillator of a frequency mixer; by means of the frequency mixer, a radio-frequency signal to be output is downwardly converted to an intermediate-frequency signal having a relatively low frequency and then enters a digital phase-locked circuit; simultaneously, input of a serial interface control signal of a phase discriminator in the digital phase-locked circuit is controlled through a program, such that any frequency dividing ratio can be realized; in combination with the multi-CRO switching technology, frequency switching of a broadband, high-resolution low-phase-noise phase-locked frequency source can be realized; after the frequency of a signal is multiplied, a high-resolution low-phase-noise Ka-frequency-band frequency source is realized; the technology has relatively high universality; the multi-frequency-point low-phase-noise frequency source can be realized by properly changing circuit parameters and FPGA programs; and thus, the multi-frequency switching system and method disclosed by the invention have wide application prospects.

Description

technical field [0001] The invention is a multi-frequency switching system and method for a miniaturized Ka dual-frequency transmitter, which ensures high phase noise index while realizing multi-frequency point output. This technology has strong versatility and is a multi-frequency switching method with good phase noise performance that is easy to design and debug, and can be used in aerospace products. Background technique [0002] The miniaturized relay terminal is an upgrade and replacement system for the first generation of relay terminals. It has the advantages of small size, light weight, low power consumption, and high performance indicators. It has been applied to many remote sensing series satellites. The spaceborne miniaturized Ka modulation transmitter is the key extension of the miniaturized relay terminal. The main function is to output the baseband signal provided by the digital transmission subsystem to the traveling wave tube amplifier after channel coding,...

AI Technical Summary

Problems solved by technology

[0007] The technology of the present invention solves the problem: to overcome the shortcomings of the fixed set number frequency switching method used in the prior art and the single digital phase-locking technology or sampling phase-locking technology that cannot adapt to the wide frequency interval and high phase noise index of the new model, and proposes A multi-frequency switching system and method for miniaturized Ka dual-frequency transmitters, which solves the Ka-band frequency source with high resolution and low phase noise, and ensures high phase noise indicators while realizing multi-frequency point output

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