System and method for time delay calibration of Beidou navigation signal hardware simulator

Abstract

The invention discloses a system and a method for time delay calibration of a Beidou navigation signal hardware simulator. The system comprises a satellite navigation signal simulator, a signal acquisition module, an isolation amplifier and a signal processing module, wherein the isolation amplifier outputs a first clock signal and a second clock signal; the satellite navigation signal simulator takes the first clock signal as a work clock and outputs a radio frequency analog signal and a pulse per second signal; the signal acquisition module takes the second clock signal as a sampling clock and is used for acquiring the radio frequency GEO (geosynchronous) satellite analog signal and the pulse per second signal; and the signal processing module calculates delay inequality between an initial code phase of the radio frequency GEO satellite analog signal and a pulse per second rising edge of the pulse per second signal based on the acquired radio frequency analog signal and the pulse per second signal to obtain the time delay of the simulator. With the adoption of the technical scheme, a special zero-pseudorange or fixed-pseudorange testing scene is not required to be set in the simulator, and the time delay of the simulator can be calibrated when the simulator simulates output normally.

Description

technical field [0001] The invention relates to a time delay calibration method. More specifically, it relates to a system and method for time delay calibration of Beidou navigation signal hardware simulator. Background technique [0002] With the construction and improvement of China's Beidou navigation system, a regional navigation system capable of covering Asia has been realized. The Beidou system has been widely used in navigation, geodetic mapping, time transfer, and other navigation, positioning and timing services. The Beidou navigation signal simulator is a high-precision standard signal simulation source, which can simulate the satellite signals received by the Beidou receiver in the actual environment, provide a simulation environment for the development and testing of Beidou series receivers, and can also generate signals under specific conditions. The navigation signal is used to test and verify various performances and indicators of the Beidou receiver, and is...

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Problems solved by technology

The above method is also applicable to the calibration of the time delay of the Beidou navigation signal simulator, but the above calibration method needs to set a special test scenario of zero pseudo-range in the navigation signal simulator

In addition, when calibrating the delay of the simulator through a special scenario, since the special scenario is a test scenario for testing the indicators of the simulator, it is different from the generation method of the output analog signal in the natural simulation scenario, and there are differences between the special test scenario and the natural simulation scenario. The possibility of inconsistent simulator delays

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