Method for correcting GNSS intermediate frequency signal analogue source quantization error
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: 2015-05-13
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 GNSS (Global Navigation Satellite System) intermediate frequency signal analogue source quantization errors. The method comprises the following steps of: (1) calculating state information data of each satellite by a PC (Personal Computer) according to parameter configuration, pre-processing the calculated parameters and transmitting the calculated data to a DSP (Digital Signal Processor); (2) calculating data demanded to generate various satellite signals by the DSP according to the obtained data, and transmitting the obtained data to an FGPA (Field Programmable Gate Array); (3) correcting the quantization errors, generating real-time digital baseband signals of each satellite by the FGPA according to the received data, and converting the digital baseband signals into analogue intermediate frequency signals through a DA (Driver Amplifier) and outputting the signals. When the GNSS analogue signals are generated, various obtained satellite state information data is pre-processed and transmitted to the DSP by the PC instead of being directly transmitted to the DSP, and the impact of the quantization error to the GNSS analogue source performance is as much as possible reduced by the DSP according to the processed data correction and quantization errors, so that the signal precision of a GNSS intermediate frequency signal simulator is improved.
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