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

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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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 on code storage, which is a GPS signal processing method that improves the real-time and portability of software receiver tracking, and can be easily and effectively used by pre-stored The estimated fine-tuning generates binary data of C / A code, which can be loaded into the memory to realize the look-up table to realize real-time calling of morning and evening codes and real-time codes, thereby eliminating the time of local fine-tuning C / A code generation in tracking

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