Method and system for testing DS/FH (Direct Sequence/Frequency Hopping) mixed spread frequency signal parameters

Abstract

A system for testing DS / FH (Direct Sequence / Frequency Hopping) mixed spread frequency signal time frequency parameters is provided. The system comprises a frequency converter unit, an acquisition and storage unit and a test terminal. The system combines an image processing method to complete the extraction of discrete DS / FH mixed spread frequency signal time frequency parameters, and a testing method comprises the steps of carrying out time frequency analysis to a signal to be tested first, regarding the analysis result as a two-dimensional image for preservation; then processing interference signals such as noisy points, glitches and the like in the image by employing an image morphological theory; and finally testing a plurality of time frequency parameters such as frequency hopping patterns, frequency hopping rates and the like by combining the corresponding relations of image pixel positions to the time frequency parameters. According to the invention, the elimination of interference factors in the test of DS / FH mixed spread frequency signals is achieved, and indexes such as the frequency hopping patterns, the frequency hopping rates and the like that are hard to analyze by the present technology are tested. The method and the system for testing the DS / FH mixed spread frequency signal time frequency parameters can be applied to equipment detection and analysis, and signal analysis and processing of a disoperative target in communication countermeasure.

Description

technical field [0001] The invention relates to a method and a system for testing parameters of a direct spread / frequency hopping (Direct Sequence / Frequency Hopping, DS / FH) mixed spread spectrum signal. Background technique [0002] Testing technology is the guarantee for the development of modern science and technology. The famous scientist Mendeleev once said: "Without testing, there is no science." As an important branch of testing technology, electronic testing technology is a method of analyzing the system using modern electronic technology. It has the characteristics of wide testing frequency band, high testing accuracy, and good repeatability. It is a measure of a country's equipment development level and industrial modernization level. important sign. With the advancement of communication technology, the test technology has gradually developed from the original analog test equipment to digital measurement equipment. The continuous innovation of computer technology ...

AI Technical Summary

Problems solved by technology

However, as a more advanced spread spectrum signal system, DS / FH combines the characteristics of frequency hopping and spread spectrum, and the signal characteristics are more complex. The test method for the time-frequency parameters of DS / FH mixed spread spectrum signals, especially for non-cooperative targets The research on the blind test method of the signal, there is no effective method at present

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