GPS software receiver baseband signal real-time tracking method based on code memory

A software receiver and real-time tracking technology, which is applied to satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve the problems of time-consuming platform and processor performance dependence of morning and evening codes and real-time codes, and achieve high speed , low cost, cost reduction effect

Active Publication Date: 2010-06-30
SOUTHEAST UNIV
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Problems solved by technology

[0009] The purpose of the present invention is to solve the time-consuming problem of fine-tuning morning and evening codes and real-time codes generated by the tracking loop of the GPS software receiver per unit time, the algorithm is too dependent on the performance of the platform and processor, and the portability of multi-platform and multi-device is considered. The problem is to provide a GPS software receiver baseband signal real-time tracking method based o

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  • GPS software receiver baseband signal real-time tracking method based on code memory
  • GPS software receiver baseband signal real-time tracking method based on code memory
  • GPS software receiver baseband signal real-time tracking method based on code memory

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0025] figure 1 It is the tracking flowchart of the GPS software receiver of the present invention, the input is the GPS satellite intermediate frequency signal collected by the radio frequency front end, the signal is related to the local carrier produced by the local oscillator with a phase difference of 90 degrees, and the two-way stripped carrier of the I road and the Q road is produced The satellite signals of the two channels are related to their synchronization codes, that is, the I channel and the Q channel are respectively correlated with the pre-stored fine-tuned local C / A codes by 0.5 chips before and after, the pseudo-random codes are stripped, and the output is navigation data information. Among them, the synchronous code is obtained from the output of the code phase detector. The output value of the code phase detector in the last cycle is filtered t...

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Abstract

The invention discloses a GPS software receiver baseband signal real-time tracking method based on code memory, wherein the method is based on prestored and fine-adjusted local C/A code to perform binary system storage and performs table lookup and invocation to solve the problem that real-time code which wastes time are generated in GPS software receiver tracking signal time. In GPS software receiver tracking loop, the process that local C/A code is generated through minute adjustment is longest in the three longest processes, namely generation of fine-adjusted local C/A code, generation of local carrier wave and related integration and the time for generating fine-adjusted local C/A code is nearly half of the entire signal tracking and processing time. The invention uses the binary data of prestored and fine-adjusted local C/A code and directly loads data to perform table lookup and call data so that the fine-adjusted early code and late code can not be generated in every tracking cycle, the time wasted by real-time code can be saved, the time for the generation of codes in tracking cycle is saved and the tracking speed doubles.

Description

technical field [0001] The invention relates to the improvement of real-time tracking of GPS software receivers, in particular to a method for real-time tracking of baseband signals of GPS software receivers based on code storage, which belongs to the technical field of electronic information and digital signal processing. Background technique [0002] At present, the real-time research status of GPS software receiver tracking at home and abroad is as follows: [0003] (1) The traditional tracking of GPS software receiver adopts adjusting the code frequency and code phase per unit time to generate early code, late code, real-time code and the local recurring carrier of satellite signal in real time. [0004] (2) Use a computer with powerful performance, adopt multi-CPU core processing or use long instructions to process data in parallel to improve the speed of the tracking loop. [0005] In recent years, the research on the real-time performance of GPS software receivers ha...

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Application Information

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IPC IPC(8): G01S19/30
Inventor 王庆潘树国季伟波曹耀传
Owner SOUTHEAST UNIV
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