GPU-based parallel satellite navigation signal simulation method

Abstract

The invention discloses a GPU-based parallel satellite navigation signal simulation method, and aims at solving the problem that the calculation speed is low in test signal generation process in the technical field of satellite navigation. According to the method, a CPU+GPU hybrid heterogeneous computing mode is adopted; and a GPU is imported to serve as an acceleration component for signal synthesis and matched with a CPU to complete program operation. The CPU is responsible for functions such as user data reading, visible star judgement, model calculation and the like; and the GPU is responsible for functions such as propagation delay calculation, table lookup calculation, signal multiplication and accumulation and the like under high sampling rates. In the aspect of memory optimization,spread spectrum codes and navigation messages use texture memories, and three-order change rate parameters and sparse sampling propagation delay use constant memories, so that memory access speeds ofprograms are improved. Finally, the satellite navigation signal simulation speed is improved.

Description

technical field [0001] The invention relates to a method for realizing a satellite signal simulation source based on GPU acceleration, belonging to the field of satellite navigation and testing. Background technique [0002] With the increasing popularity and wide application of satellite navigation technology, higher requirements are put forward for the development, testing and evaluation of related products, and the satellite navigation signal simulation source has become an important measurement equipment. There are two main methods of traditional satellite navigation signal simulation: one is a pure hardware combination satellite navigation simulation source, which is stable in performance but high in cost and not easy to maintain and upgrade; the other is a host computer software and playback hardware The combined analog source has the advantages of low cost, easy upgrade and portability. For the second analog source solution, the general implementation process is as f...

AI Technical Summary

Problems solved by technology

Among them, the generation of intermediate frequency signal files is the core technology of the satellite navigation signal simulation source. In this process, a huge amount of calculation is required to generate the signal, which brings a huge operating burden to the CPU and greatly reduces the use efficiency of the simulation source. As a result, traditional upper computer software is difficult to meet complex application requirements in terms of signal sampling rate, processing speed, and calculation accuracy.

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