Calibration system for RDSS channel zero value

Abstract

A calibration system for RDSS (Radio Determination Satellite Service) channel zero value comprises a spread spectrum signal source, a microwave signal source, a frequency converter, a power divider, a double-channel digital oscilloscope, a first attenuator, a second attenuator, a control and processing computer and a vector network analysis instrument, wherein the spread spectrum signal source generates simulated RDSS spread spectrum signals; spread spectrum signal source outcoming signals are subjected to frequency conversion by the microwave signal source and the frequency converter so as to generate frequency points suitable for RDSS service channel input; a high-sampling rate digital oscilloscope is used for synchronously sampling the input / output signals of the RDSS service channel; and the control and processing computer is used for completing initialization of the oscilloscope, acquisition and loading of the oscilloscope channel data, orthogonalization of the channel data, carrier rotation, circulating autocorrelation, peak value searching, and zero value calculation and processing, so as to eventually obtain the absolute time delay of the RDSS service channel. According to the system provided by the invention, the signals consistent with the RDSS service system are adopted to serve as the reference, the calibration zero value can reflect the real conditions and the calibration precision is high.

Description

technical field [0001] The invention relates to a system for zero-value calibration of satellite radiodetermination traffic channels. Background technique [0002] The satellite navigation system can send high-precision, all-day and all-weather navigation, positioning and timing information, and is an indispensable and important space infrastructure for today's national economy and national defense construction. In order to establish an independent Chinese satellite navigation system and avoid the situation of being controlled by others, our country is accelerating the development and construction of satellite navigation system. Since 2000, my country has completed the establishment of the first-generation Beidou navigation and positioning system. The system adopts the RDSS (Radio Determination Satellite Service) working mode and has been applied in many fields. In addition, satellite transparent transponders are often used in time service systems for time transfer and cali...

AI Technical Summary

Problems solved by technology

The time delay obtained by this method is the absolute time delay of each frequency point in the transmission passband, and cannot accurately reflect the channel zero value of the RDSS channel transmission of specific RDSS service spread spectrum signals

[0006] The literature "Research on Group Delay Measurement Method Based on Spread Spectrum Signal" ("Modern Electronic Technology", Issue 1, 2010, Issue 312, pp8-11, authors: Sha Hai, Zhu Xiangwei, Zhang Guozhu, Sun Guangfu) proposed a method using spread spectrum signal Related group delay test method, but this method requires that the input and output of the DUT must be at the same frequency, and the input and output frequencies of the radio measurement service channel are different, so this method cannot be used for zero value calibration of the radio measurement service channel

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