Quaternary phase-shift keying signal tracking method and device

Abstract

The invention relates to a quaternary phase-shift keying signal tracking method and device, which are applied to a GNSS (Global Navigation Satellite System) receiver. Under the combined tracking mode of in-phase and orthogonal dicode channels, the method comprises the following steps of: carrying out correlation operation respectively with corresponding local PRN (Pseudo-Random Noise) codes on an in-phase (I) code channel signal and an orthogonal (Q) code channel signal after down-conversion, and outputting the integral results of the I code channel signal and the Q code channel signal; respectively carrying out identification on the integral results of the I code channel signal and the Q code channel signal in at least one tracking loop so as to obtain identification results; and carrying out mathematic operation on the identification results of the I code channel signal and the Q code channel signal in the same tracking loop so as to obtain a synthesized identification result. In the tracking loop, the corresponding devices comprise an I code channel identifier, a Q code channel identifier and a synthetic identifier. According to the quaternary phase-shift keying signal tracking method and device, the noise intensity of the tracking loops such as DLL (Dynamic Link Library), PLL (Phase Locked Loop) and FLL (Fixed Loss Loop) is obviously reduced.

Description

technical field [0001] The invention relates to a quadrature phase shift keying (QPSK) signal tracking method and device Background technique [0002] As the first global satellite navigation system, the Global Positioning System (Global Positioning System, GPS) was originally a military / civilian dual-use system established to meet the positioning service needs of the US military. For users outside of the U.S. government and military, the system has had obvious flaws since its inception: [0003] 1. Only the GPS-L1 C / A signal is really open to civilian users, making it difficult for civilian receivers to perform ionospheric correction. The ionospheric error is the main error source of GPS receiver observations (the other big error comes from multipath interference). Although the application of codeless or semi-codeless tracking technology makes it possible for civil dual-frequency receivers, the price paid is that the signal-to-noise ratio of the L2 signal on the tracking ...

AI Technical Summary

Problems solved by technology

Although the application of codeless or semi-codeless tracking technology makes it possible for civilian dual-frequency receivers, the price paid is that the signal-to-noise ratio of the L2 signal on the tracking is greatly reduced, thus increasing the tracking error and easily losing the signal

[0004] 2. The accuracy and integrity indicators of GPS-L1 C / A signals are difficult to meet the needs of some special navigation applications (such as civil aviation, etc.)

[0005] 3 The design of the original signal is mainly for military purposes, and the goal of the GPS receiver is to work normally in the wild (no occlusion) environment, so it is difficult to meet the needs of the majority of mobile communication users for the Global Navigation Satellite System (Global Navigation Satellite System, GNSS) indoor application requirements

[0007] However, in the prior art, there is no specific method and device for realizing in-phase and quadrature dual-code channel combination (also referred to as dual-code channel combination or I / Q combination) tracking

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