Method for carrying out monopulse tracking demodulation by using high-speed frequency hopping signal
A frequency-hopping signal and single-pulse technology, applied in the direction of modulated carrier system, digital transmission system, electrical components, etc., can solve the problems of lack of processing methods, etc., and achieve the effect of simple structure, easy upgrade, and high reliability
Active Publication Date: 2022-01-21
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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However, there is still a lack of corresponding processing methods in the prior art
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[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0027] A method of single-pulse tracking demodulation using high-speed frequency-hopping signals, assuming that the sum signal and difference signal generated by the antenna feed are subjected to low-noise amplification, down-conversion, filtering, analog-to-digital conversion, digital down-converter, etc. After the same processing, the signal within the selected bandwidth becomes a digital quadrature signal with zero intermediate frequency; the sum signal and the difference signal are synchronized separately N Windowed FFT processing of points, the signal within the selected bandwidth is converted to 2 N The [-m, m] interval of frequency points, where m is an integer; take the energy value of all points in the sum signal...
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The invention discloses a method for carrying out monopulse tracking demodulation by using a high-speed frequency hopping signal, and belongs to the technical field of radio frequency antenna self-tracking. The method comprises the following steps of: respectively carrying out homologous down-conversion, analog-to-digital conversion, digital frequency conversion and the like on a radio frequency sum signal and a difference signal, and then respectively carrying out FFT (Fast Fourier Transform) processing, correlation of the sum signal and the difference signal, down-sampling extraction, interference detection, angle error detection and the like. Non-frequency-hopping synchronous monopulse angle error demodulation is carried out by using part of frequency hopping bandwidth of a high-speed frequency hopping signal. According to the invention, digital demodulation of the dual-channel monopulse angle error is carried out based on the frequency domain, and the method has the advantages of fast response speed, high integration degree, low operational signal-to-noise ratio, convenient delay correction and the like, and is an important improvement on the prior art.
Description
technical field [0001] The invention relates to the technical field of radio frequency antenna self-tracking, in particular to a method for single-pulse tracking and demodulation using high-speed frequency-hopping signals. Background technique [0002] At present, most monopulse tracking receivers use beacon signals, broadband communication signals, or measurement and control signals as source signals for monopulse tracking. In some application environments, only high-speed frequency-hopping communication or measurement and control signals exist, and high-speed frequency-hopping signals need to be used as source signals for single-pulse tracking; in the initial tracking stage of the antenna, the local frequency-hopping local oscillator has not completed the hopping with the receiving signal. Frequency signal synchronization, it is necessary to detect the angle error information from the high-speed frequency hopping signal received by the antenna without synchronizing the fre...
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IPC IPC(8): H04B1/10H04B1/16H04B1/713H04B1/7163H04B17/21H04L27/156
CPCH04B1/713H04B1/7163H04B1/16H04B17/21H04B1/10H04L27/156
Inventor 李强张红涛高焕英林兴隆
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP