Efficient MSK direct spread communication detecting method

Abstract

The invention discloses an efficient MSK direct spread communication detecting method. The method comprises the steps that firstly, a non-cooperative receiver searches for, monitors and samples related frequency bands, an internal high-speed processing chip carries out segmentation self-correlation and square operation on sampling data, the processed sampling data are accumulated to reduce the adverse effect of noise, and the value of a symbol period Ts is estimated by searching for peak values of an accumulation sequence and calculating the interval between adjacent peak values; secondly, delay multiplying, high pass, fast Fourier transform and other processing are carried out on a receiving signal to estimate the time width Tc of an MSK spread spectrum system chip; thirdly, on the basis of the analysis and process, the Tc delay multiplying, low pass, Hilbert transform, Ts window sliding observing and other analyzing processing are carried out on the receiving signal, and a spread spectrum pseudorandom sequence of the spread spectrum system can be estimated. The needed operations are easy to process, detecting speed is high, and the method can meet the requirement for non-cooperative communication detecting.

Description

technical field [0001] The invention relates to an efficient detection method for MSK direct spread communication. Background technique [0002] The characteristics of the existing MSK direct spread communication non-cooperative detection processing method are as follows: 1. To a large extent, the baseband signal is analyzed and processed, and there are unavoidable defects in the MSK spread spectrum communication non-cooperative detection in terms of carrier extraction and phase tracking; 2. The detection processing fails to effectively utilize the gain brought by blind despreading of unknown MSK spread spectrum signals; 3. Using high-order cumulants, cyclic spectrum or matrix decomposition methods to extract signal features requires a large amount of calculation and detection processing It is very difficult to implement; 4. The implementation of using the orthogonal branch detection processing method is affected by many factors. [0003] There are deficiencies in the prior...

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Problems solved by technology

[0002] The characteristics of the existing MSK direct spread communication non-cooperative detection processing method are as follows: 1. To a large extent, the baseband signal is analyzed and processed, and there are unavoidable defects in the MSK spread spectrum communication non-cooperative detection in terms of carrier extraction and phase tracking; 2. The detection processing fails to effectively utilize the gain brought by blind despreading of unknown MSK spread spectrum signals; 3. Using high-order cumulants, cyclic spectrum or matrix decomposition methods to extract signal features requires a large amount of calculation and detection processing The implementation is difficult; 4. The implementation of the orthogonal branch detection processing method is affected by many factors

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