Signal tracking method and signal tracking device

Abstract

The invention discloses a signal tracking method and a signal tracking device. The method comprises the following steps: receiving a broadband composite signal; the broadband composite signal comprises at least one upper sideband signal component and at least one lower sideband signal component; tracking the first target signal by using the first local instant code so as to at least determine the current fusion phase and the current fusion frequency of the carrier and the subcarrier; tracking the second target signal by using a local instant carrier to at least determine a current code phase, a current code frequency, a current subcarrier phase and a current subcarrier frequency; one of the first target signal and the second target signal is an upper sideband signal component, and the other one is a lower sideband signal component; the first local instant code is determined based on a previous code phase and a previous code frequency, and the local instant carrier is determined based on a previous fusion phase and a previous fusion frequency. The problem of coupling of the carrier phase and the subcarrier phase is solved, and the accuracy is higher.

Description

technical field [0001] The embodiments of the present application relate to the technical field of satellite navigation and tracking, and in particular, to a signal tracking method and a signal tracking device. Background technique [0002] As people's requirements for positioning accuracy are getting higher and higher, the Global Navigation Satellite System (GNSS) is constantly updated. Compared with the Binary Phase Shift Keying (BPSK) signal, the sub-carrier modulated signal has the characteristics of frequency domain separation, wider RMS bandwidth and higher ranging accuracy, so the current GNSS signal usually A subcarrier modulated signal such as an AltBOC signal or an ACE-BOC wideband composite signal is used. [0003] Both the AltBOC signal and the ACE-BOC wideband composite signal are dual-frequency constant-envelope composite signals. In most cases, both have four signal components, two of which are located in the lower sideband and the other two are located in th...

AI Technical Summary

Problems solved by technology

Among them, DBT technology is only applicable to GNSS signals with equal signal component power, such as AltBOC signals, and cannot solve the problem of carrier phase and subcarrier phase coupling

Although ASYM-DBT technology can be applied to GNSS signals with unequal signal component powers, ASYM-DBT technology is aimed at the amplitude domain of signal components. Estimation and normalization are performed to realize signal tracking, that is to say, the ASYM-DBT technology first converts the signal components of non-equal power equivalently into signal components of equal power and then adopts DBT technology, and the estimation of signal component power will be affected by Many factors interfere and the accuracy is very low, which leads to the unequal signal power after normalization, which makes the subsequent DBT technology unusable

It can be seen from the above that the existing tracking technology cannot solve the problem of carrier phase and subcarrier phase coupling, and is not suitable for ACE-BOC broadband composite signals

Images