A self-detection gps vector tracking loop method for disturbed channels

Abstract

An interfered channel self-detection GPS vector tracking loop scheme includes five steps: 1. according to arrangement and a fusion relation of information flow in GPS vector tracking loop, a precise GPS vector tracking loop (including a VFLL and a VDLL) system models are derived and established; 2. according to the system models of the VFLL and VDLL, transfer functions and noise bandwidth models of the VFLL and VDLL are established; 3. an interfered channel self-detection GPS vector tracking loop scheme working process is designed; 4. an interfered channel self-detection GPS vector tracking loop combined filter model is designed; and 5. a channel error on-line detection algorithm is utilized to detect and eliminate interfered channels in the GPS vector tracking loop. The method provided by the invention can effectively identify and isolate the interfered signal channels, thereby improving anti-interference of GPS vector tracking and navigation calculation precision of a GPS vector receiver.

Description

1. Technical field [0001] The invention relates to a design method for a global positioning system (GPS, Global Positioning System) vector tracking loop self-detected by an interfered channel, and belongs to the technical field of navigation. 2. Background technology [0002] As an important space infrastructure and strategic resource, GPS is playing an increasingly important role in the military and civilian fields. With the increasingly complex application environment of navigation equipment in the field of national defense, the comprehensive performance of GPS receivers is proposed. higher requirements. The processing of the received signal by the GPS receiver includes capture, tracking, navigation message extraction and navigation calculation, among which signal tracking is the most critical and weakest link. In order to cope with complex application environments and improve the accuracy of signal tracking and navigation positioning, Spilker Jr. first proposed the conce...

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Problems solved by technology

[0007] The channel coupling and data sharing of the vector tracking loop realize the mutual assistance of information between strong and weak signals, but when the received signal of a certain channel is interfered by strong noise, its tracking error will inevitably spread among the channels, resulting in the loss of all signals track loss of lock

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