Detection and parameter estimation method and device for non-cooperative spread spectrum signal

Abstract

The invention discloses a detection and parameter estimation method and device for a non-cooperative spread spectrum signal, and the method comprises the steps: carrying out the detection and parameter estimation of an input carrier frequency, and extracting the carrier frequency in a spread spectrum signal; carrying out period detection and parameter estimation on the spread spectrum code in the input, and extracting the code period of the spread spectrum code in the spread spectrum signal; and estimating parameters of the code rate and the code length of the spread spectrum code in the input, and extracting the parameters of the code rate and the code length of the spread spectrum code in the spread spectrum signal. The device is used for implementing the method. The method has the advantages of being simple in principle, high in accuracy, capable of improving efficiency, wide in application range and the like.

Description

technical field [0001] The present invention mainly relates to the technical field of spread spectrum communication, in particular to a detection and parameter estimation method and device for non-cooperative spread spectrum signals. Background technique [0002] Direct spread spectrum communication is a kind of spread spectrum communication. In spread spectrum communication, spread spectrum signal has good concealment of low power spectrum transmission and anti-interference ability of signal correlation processing. Due to the characteristics of the spread spectrum signal, it is difficult to detect the spread spectrum signal on the one hand, and on the other hand, even if the signal is detected, it is impossible to effectively know the corresponding parameters for demodulation, despreading and information recovery. [0003] At present, many studies on spread spectrum countermeasures are aimed at FM communication signals. There are many studies on narrowband interference supp...

AI Technical Summary

Problems solved by technology

Due to the characteristics of the spread spectrum signal, it is difficult to detect the spread spectrum signal on the one hand, and on the other hand, even if the signal is detected, it is impossible to effectively know the corresponding parameters for demodulation, despreading and information recovery.

[0003] At present, many studies on spread spectrum countermeasures are aimed at FM communication signals. There are many studies on narrowband interference suppression, code acquisition, code tracking, code synchronization, code tracking and multi-user detection of DS / CDMA systems for spread spectrum signals. , seldom involves the detection of non-coordinated spread spectrum signals

However, part of the existing design schemes for spread spectrum signal detection and parameter estimation use cyclic spectrum detection, but the design is complex and difficult to realize engineering; the other part uses delay multiplication schemes, but there is a problem that it can only be adapted Use when the signal-to-noise ratio is strong

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