Method for adaptively acquiring P codes on basis of averaging technology

Abstract

The invention provides a method for adaptively acquiring P codes on the basis of an averaging technology. The method is an algorithm for quickly directly acquiring the P codes on the basis of circular correlation theories, each N points in pseudo code sequences of received signals are sequentially subjected to averaging processing to form a new sequence, local pseudo code sequences are subjected to similar processing to form a new sequences, each two corresponding new sequences are subjected to circular correlation processing, particular code intervals where code elements in the received signals are located can be judged when correlation peak values are higher than judgment thresholds, and the exact positions of the code elements can be determined. The method is equivalent to the basic averaging technology when the signals are high in intensity and has the advantage of calculation economization.

Description

technical field [0001] The invention belongs to the field of signal capture, and in particular relates to a P code self-adaptive capture method based on an average value method. Background technique [0002] The Global Positioning System (GPS) can provide users with Standard Positioning Service (SPS) and Precise Positioning Service (PPS). PPS can provide more precise positioning accuracy and timing accuracy. The provision of SPS is based on C / A code, while the provision of PPS is based on P code. Generally, the acquisition of P code is based on the acquisition of C / A code, and the P code signal is captured according to the information provided by C / A code, but C / A code is easily interfered, so the direct acquisition of P code becomes Very important. The P code is a pseudo-random code with a long period and a high rate. It is difficult to capture it directly, requiring a long capture time and a huge amount of calculation. [0003] At present, a lot of researches have been...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome above-mentioned deficiency, provide a kind of P code self-adaptive capture method based on mean value method, when signal is stronger, tool mean value method calculation amount is less; Increase the detection signal-to-noise ratio, and the signal can still be captured when the average method cannot meet the capture requirements

Images