A Detection and Judgment Method Based on DS Signal Acquisition

Abstract

The invention belongs to the field of spread spectrum communication and statistics, and specifically relates to a detection and judgment method based on direct spread signal capture, including searching for the i-th capture unit, obtaining detection variables through a non-coherent accumulation process; Adaptive threshold, after each accumulation, judge the detection variable according to the adaptive threshold, record the judgment result, if the detection variable exceeds the threshold, then record the code phase value here; in N accumulations, if there are M accumulations If the judgment result satisfies the conditions of the neighbor constraint, then it is judged that the unit captures successfully, otherwise it goes to the next unit to continue searching. The multiple detection and judgment method based on the self-adaptive threshold of the present invention introduces neighbor constraints for the impact of high dynamics on the pseudo code offset, further detects the judgment results, allows a higher false alarm rate for a single judgment, and reduces a single judgment. The adaptive threshold of the judgment can achieve the purpose of improving the total detection probability.

Description

technical field [0001] The invention belongs to the field of spread spectrum communication and statistics, and specifically relates to a detection and judgment method based on direct spread signal capture. By introducing neighbor constraints and self-adaptive threshold multiple judgments, joint search and judgment are carried out on the capture results, which reduces the total false alarm rate , which improves the capture performance and is suitable for the capture of high dynamic and low carrier-to-noise ratio signals. Background technique [0002] The direct-sequence spread spectrum communication system is one of the measurement and control systems used in the aircraft measurement and control system. The direct-spread signal includes data codes, pseudo-random codes, and carrier waves. The capture of the direct-sequence signal is obtained through operations such as synchronization, integration, and detection The two key parameters are the pseudo-code offset and the carrier ...

AI Technical Summary

Problems solved by technology

Compared with a single detection judgment, the false alarm probability of the M / N judgment is small, but the detection time used is relatively long, and the detection performance in a high dynamic environment is poor

[0006] The Tong search detection method is a variable dwell detection scheme. In principle, more search time is added to the signal search units that are difficult to determine whether the capture is successful or not. Therefore, the false alarm rate of the Tong detection method is lower. In some random abnormal situations (such as: noise interference, etc.), good detection performance can still be maintained, but the implementation process of this algorithm is relatively complicated and the calculation load is large

[0007] To sum up, when the direct spread signal has high dynamics and low carrier-to-noise ratio, the traditional capture method cannot meet the detection performance requirements.

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