A Method for Unambiguous Capture of BOC Signals Based on Side Peak Removal

Abstract

The present application relates to a method for capturing BOC signals without ambiguity based on side peak elimination. The method constructs the local waveform, generates the local code waveform signal and the local BOC signal and the I and Q branch signals of the input signal to perform correlation accumulation respectively, and obtains the I and Q branch correlation signals and the BOC signal of the BOC signal autocorrelation synthesis function The correlation signals of the I and Q branches of the cross-correlation function of the local code waveform are processed by non-coherent dot product detection for these four channels of correlation signals, and a non-linear non-ambiguous capture judgment synthesis function is constructed, which is synthesized according to the non-ambiguous capture judgment function and the preset capture threshold to complete the capture decision. The BOC capture method proposed by the invention can realize the unambiguous capture of the BOC signal, and the attenuation of the carrier-to-noise ratio is small, and is suitable for BOC signals of different orders, and the capture performance is also better than the traditional capture algorithm.

Description

technical field [0001] The present application relates to the technical field of satellite navigation signal reception, in particular to a method for unambiguous acquisition of BOC signals based on side peak elimination. Background technique [0002] The global satellite navigation system is a technology that combines traditional radio navigation and astronomical surveying and mapping to provide users with global, all-weather, continuous, real-time positioning, navigation and timing services. With the continuous development of systems and technologies, the number of satellite systems The frequency band is more and more crowded, the traditional BPSK modulation method can no longer meet all the needs, because the BOC modulation signal can make full use of the frequency band resources, and has better code tracking accuracy and anti-interference ability, so the existing Satellite navigation systems have widely used BOC modulation signals. The BOC modulation signal is based on t...

AI Technical Summary

Problems solved by technology

At present, the main unambiguous capture methods include Bump-Jump method, BPSK-like method, and edge peak elimination method. The former two require additional auxiliary means, and they need to consume additional resources for implementation.

In order to overcome the previous several unambiguous acquisition methods, another type of acquisition method has emerged: use the non-matched filter method to receive, generate a set of local codes locally, and perform correlation combination with the received signal, so that the combination function has no side peaks, thus Unambiguous capture is achieved, but the capture performance of such methods will drop sharply with the increase of the BOC signal order, and it is necessary to study a capture algorithm with low loss of capture performance

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