Configurable navigation signal compatible capturing and tracking device

Abstract

The invention discloses a configurable navigation signal compatible capturing and tracking device. In an initial state, a navigation signal enters a relevant module through an orthogonal frequency offset removing module, and the relevant module performs relevant despreading processing on the navigation signal and then sends the signal to a FFT judging module. The FFT judging module outputs a capture success sign after the judgment is successful, and ends a capture process and starts tracking. Under the condition of capture failure, a step adjustment module selects different search steps according to navigation signal types input by the system, and an adjustment code generation module performs a next capture process. After starting the tracking, an early-middle-late correlator outputs a plurality of paths of correlation values, triggering a peak jump module to perform secondary peak locking judgment. If locked on a secondary peak, the step adjustment module is promoted to perform 1 / 2 chip phase jump. At the same time, a code ring phase discriminator and a filter realize real-time tracking of pseudo codes, and a carrier loop phase discriminator and the filter complete real-time tracking of carrier. The device has advantages of low processing difficulty, good compatibility and good channel consistency.

Description

Technical field [0001] The invention relates to the field of navigation signal acquisition and tracking, in particular to a configurable navigation signal compatible acquisition and tracking device, which is mainly used for the acquisition and tracking of satellite navigation signals of new and old systems. Background technique [0002] With the rapid development of the global satellite navigation system (GNSS), based on the original direct-spread navigation signal (DSSS-BPSK), people have developed a binary offset carrier (BOC) modulation method, which effectively realizes the common frequency and spectrum Separation brings advantages such as better anti-interference and high-precision measurement. [0003] The design and implementation of GNSS navigation signals gives multiple systems the ability to operate compatible with each other. Multi-system compatible operation mainly refers to the compatibility of the signal and information processing of the three major navigation systems...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a navigation signal compatible acquisition and tracking device with configurable channels to solve the problem of fast acquisition and accurate tracking of navigation signals of the old and new systems

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