A parallel simulation method for satellite navigation signals based on GPU
A satellite navigation signal and simulation method technology, which is applied in the field of satellite signal simulation source realization, can solve the problems of reducing the use efficiency of simulation sources, signal sampling rate, processing speed and calculation accuracy difficult to meet application requirements, etc., and achieve the effect of reducing memory access delay
Active Publication Date: 2021-08-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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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[0025] In order to clarify the technical scheme and technical purpose of the present invention, the present invention will be further introduced below in conjunction with the accompanying drawings and specific implementation methods.
[0026] figure 1 It is a system block diagram of the present invention, which adopts a hybrid computing structure of CPU+GPU, where the CPU completes the parameter reading and signal model calculation set by the user, and the GPU completes the signal synthesis calculation.
[0027] The hardware configuration is as follows:
[0028] CPU: Intel(R) Core(R) CPU i5 4200m@2.5G
[0029] GPU: NVidia GeForce GT740M
[0030] The software configuration is as follows:
[0031] Operating system: Windows7 64 bit
[0032] Programming environment: Microsoft Visual Studio 2013
[0033] SDK: NVidia CUDA 7.5
[0034] According to the above software and hardware configuration, set the signal sampling rate to 16.369MHz, and the signal intermediate frequency to ...
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The invention discloses a parallel simulation method for satellite navigation signals based on GPU, so as to solve the problem of slow calculation speed in the process of generating test signals in the technical field of satellite navigation. As the acceleration component of signal synthesis, it cooperates with the CPU to complete the program operation. The CPU is responsible for user data reading, visible star judgment, model calculation and other functions, and the GPU is responsible for functions such as propagation delay calculation, table lookup calculation, signal multiplication and accumulation at high sampling rates. In terms of memory optimization, texture memory is used for spreading codes and navigation messages, and constant memory is used for third-order change rate parameters and sparse sampling propagation delay, which accelerates the memory access speed of the program. Finally, the speed of satellite navigation signal simulation has been 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 difficult 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 ...
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IPC IPC(8): G06F9/50G01S19/23G01S19/37
CPCG01S19/23G01S19/37G06F9/5027
Inventor 宋茂忠熊骏杜蒙
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS