BOC signal unambiguous capture method based on side peak elimination

Abstract

The invention relates to a BOC signal unambiguous capture method based on side peak elimination. The method comprises the following steps: constructing a local waveform, generating a local code waveform signal, and respectively carrying out correlation accumulation on I and Q branch signals of a local BOC signal and an input signal to obtain I and Q branch correlation signals of a BOC signal self-correlation synthesis function and I and Q branch correlation signals of a BOC signal and local code waveform cross-correlation function, and carrying out incoherent dot product detection processing on the four paths of related signals, constructing a non-linear judgment synthesis function without fuzzy capture, and completing capture judgment according to the judgment synthesis function without fuzzy capture and a preset capture threshold. According to the BOC capturing method provided by the invention, fuzzy-free capturing of the BOC signals can be realized, the carrier-to-noise ratio attenuation is relatively small, the BOC capturing method is suitable for BOC signals of different orders, and the capturing performance is also superior to that of a traditional capturing 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

Images