Layered GPS (Global Positioning System) signal parallel capturing method and module thereof

Abstract

The invention provides a layered GPS (Global Positioning System) signal parallel capturing method. A base band signal processor consisting of a layered GPS signal parallel capturing module and a microprocessor is formed. The invention also discloses a layered GPS signal parallel capturing module which comprises four submodules with different structures and adopts a large-scale search engine formed by the combination of a matching filter and a DFT (Discrete Fourier Transform) filter bank, a medium-scale search engine formed by part of matching filters, a tracking correlator formed by a plurality of tracking channels, and a capturing correlator formed by a plurality of mutually independent capturing channels. A GPS signal is captured by the submodules in a cooperative way; according to different prior information containing Doppler frequency uncertain range and code phase uncertain range, the initial capturing, the frequency precise capturing and the repeated capturing of the GPS signal are completed. The large-scale parallel search engine and the medium-scale parallel search engine adjust the Doppler frequency searching capability according to the Doppler frequency searching range in a self-adaptation way. The GPS signal parallel capturing module with the layered structure has concise hardware and high utilization rate of resources, obviously enhances the searching efficiency, and decreases the power consumption.

Description

field of invention [0001] The invention belongs to the technical field of satellite communication, and relates to a signal capturing method of a GPS receiver, in particular to a layered GPS signal parallel fast capturing method and a module thereof. Background technique [0002] The Global Positioning System (GPS) has been widely used in vehicle navigation, portable navigators, and wireless communication equipment. Major mobile communication service providers are also actively developing applications based on location services (LBS) to provide users with effective and reliable location-based Functional variety of services. This requires GPS receivers in various communication and navigation devices to quickly capture GPS signals and provide real-time positioning information under various environments. However, the GPS signal power is much lower than the noise power, especially in urban and indoor environments with severe channel fading, which brings huge limitations to the a...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of large power consumption, huge hardware resources, and low capture work efficiency of the prior art GPS signal parallel capture structure, and proposes a layered GPS signal parallel capture method, and also proposes a method for adopting the method module

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