GPS signal acquisition method and its acquisition device

Abstract

The invention relates to the field of satellite positioning and receiving and discloses a GPS signal capturing method and a GPS signal capturing device thereof. The GPS signal capturing device comprises a capturing module, a tracking module and a controller, the integral capturing process is divided into a plurality of rounds, at the beginning of each round, the controller adjusts accumulative time spans merged by incoherent integral or difference of the capturing module so that the capturing module and the tracking module capture some or all of satellites to be captured in different accumulative time spans, the satellites having high signal strength can be quickly captured in the shorter accumulative time spans, and the accumulative time spans for capturing the satellites having low signal strength in each round can be increased, so that strong and weak GPS signals can be effectively captured within the short time. Furthermore, the number of captured and output parameter estimation pairs can be adjusted according to the accumulative time spans of the capturing module and can be increased to ensure certain capturing performance within the short accumulative time.

Description

technical field [0001] The invention relates to the field of satellite positioning reception, in particular to a GPS signal capture method and a capture device thereof. Background technique [0002] The Global Positioning System (GPS for short) aims to provide all-weather positioning, navigation, and timing services around the world. As users' demand for services such as positioning becomes stronger and stronger, GPS has gradually become the standard configuration of smart phones and some tablet computers. The development of map software based on smartphones has also contributed to the sharp increase in the number of GPS users. In the use of GPS, it is first necessary to capture the satellite signal of the current position, and obtain the estimated value of the code phase and Doppler frequency of the satellite. [0003] For traditional GPS receivers, the acquisition module will search in the two-dimensional space composed of the Doppler frequency and code phase of the sate...

AI Technical Summary

Problems solved by technology

In order to take into account weak GPS satellite signals, traditional GPS receivers use a unified time to capture strong and weak GPS satellite signals, and use a unified time to capture GPS satellite signals with different signal strengths will take a lot of time

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