Quantization error correction method of gnss intermediate frequency signal analog source
A technology for quantizing errors and intermediate frequency signals, which is applied in the field of global satellite navigation and positioning systems, can solve problems affecting the performance of analog sources, and achieve the effect of improving signal accuracy
Active Publication Date: 2018-11-20
上海系德信息技术有限公司
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The introduction of quantization error inevitably affects the performance of the analog source
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[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0022] The embodiment of the present invention proposes a method for correcting quantization errors in the GNSS intermediate frequency signal simulation source. In the process of GNSS simulation signal generation, the PC does not directly send the calculated satellite status information data to the DSP, but passes the data preprocessing. Finally, it is passed to DSP, and DSP corrects the quantization error according to the processed data, which can achieve the purpose of improving the accuracy of the analog signal of the GNSS analog source.
[0023] Such as figure 1 As shown, the GNSS intermediate frequency signal simulation source is mainly composed of three parts: PC, NI chassis and intermediate frequency board, and the intermediate frequency board is mainly com...
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The invention discloses a method for correcting quantization errors of GNSS intermediate frequency signal analog sources. The correction method includes the following steps: (1) PC calculates the status information data of each satellite according to the parameter configuration, and preprocesses the calculated parameters, calculates The obtained data is transmitted to DSP; (2) DSP calculates and generates the data required for each satellite signal according to the obtained data, and the calculated data is transmitted to FGPA; (3) Corrects the quantization error, and FPGA generates each satellite signal according to the received data. The real-time digital baseband signal of the satellite, the digital baseband signal is converted into an analog intermediate frequency signal by DA for output. In the process of GNSS analog signal generation in the present invention, the PC does not directly send the calculated satellite state information data to the DSP, but transmits the data to the DSP after data preprocessing, and the DSP corrects the quantization error according to the processed data to minimize the quantization error. The impact of errors on the performance of GNSS analog sources to improve the signal accuracy of GNSS intermediate frequency signal simulators.
Description
technical field [0001] The invention relates to an error correction method, in particular to a GNSS intermediate frequency signal simulation source quantization error correction method, and belongs to the technical field of global satellite navigation and positioning systems. Background technique [0002] In the technical field of GNSS (Global Navigation Satellite System, global satellite navigation and positioning system), the GNSS intermediate frequency signal simulation source is generally realized by means of PC+DSP+FPGA+DA. In this method, due to the limitation of DSP and FPGA resources, it is inevitable to quantify and truncate the data sent from PC to DSP and FPGA. Since the GNSS intermediate frequency signal simulation source itself is used as a satellite signal that can simulate various situations in real life, and is also an important standard and means for detecting GNSS receivers, the GNSS signal simulation source itself has great influence on signal quality and ...
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IPC IPC(8): G01S19/23
CPCG01S19/23
Inventor 不公告发明人
Owner 上海系德信息技术有限公司