Modified broadband hopping spread signal cross-hop coherent integration method

Abstract

The invention provides a modified broadband hopping spread signal cross-hop coherent integration method, aiming at solving the problem of long-time coherent integration of high-hop speed broadband hopping spread signal. The invention is realized by the following technical scheme: based on the carrier phase, the spread hopping signal acquisition module obtains the carrier initial phase difference correction amount between frequency hopping points of the spread hopping system introduced by the equipment channel through a priori information, and takes the correction amount as the initial phase correction amount of the subsequent cross-hop coherent integration; the carrier initial phase difference correction amount of the spread hopping system introduced by the equipment channel is used as theinitial phase correction amount. The A / D converter ADC divides the local time into coarse local time and fine local time. First Phase Correction of Cross-Hopping Coherent Integration Carrier Using Prior Initial Phase Correction; calculating a quadratic phase correction amount of a correlation function of each single-hop signal; the results of m-hop coherent integration are modified and accumulated across hops to realize the cross-hop coherent integration. If the results of m-hop coherent integration are larger than the acquisition threshold, the accurate estimation information of time delay and Doppler of the received signal is output.

Description

technical field [0001] The invention relates to a signal acquisition method mainly used in aerospace and aviation DS / FH hybrid spread spectrum measurement and control communication systems. Background technique [0002] Frequency hopping and direct sequence spread spectrum technology are two kinds of spread spectrum measurement and control communication technologies widely used at present. The frequency hopping measurement and control communication technology uses different frequency hopping patterns to realize the simultaneous operation of multi-node measurement and control communication systems within a specific bandwidth to achieve the purpose of spectrum resource sharing. From the perspective of the time domain, the frequency hopping signal is a multi-frequency frequency shift keying signal; from the perspective of the frequency domain, the frequency spectrum of the frequency hopping signal is a broadband signal that randomly jumps over a wide frequency band. Direct seq...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the deficiencies of the existing technology, to provide a method for effectively improving the acquisition sensitivity of the spread-hop measurement and control communication system, high synchronization accuracy, and using the method of correcting the cross-hop coherent integration of the wide-band jump-spread signal to realize the spread-hop signal Cross-hop coherent integration, and then solve the problem of long-term coherent integration of high-speed broadband jump-spread signals

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