Method for simulating GPS signal dynamic receiving environment and system thereof

Abstract

The invention provides a method for simulating GPS signal dynamic receiving environment and a system thereof. The method comprises the following steps: reading satellite ephemerides and establishing asatellite motion model according to the current time; solving receiver carrier attitudes; calculating the incident direction of a satellite signal according to the receiver carrier attitudes and determining each visible satellite; calculating the transmission delay, the transmission error, the Doppler shift and the signal transmission error of the satellite signal; and generating an analog signal. The satellite motion model is established according to the satellite ephemerides, the receiver carrier attitudes are solved in the satellite motion model, and the incident direction of the satellitesignal is calculated by the solution structure of the receiver carrier attitudes. Finally, the transmission delay, the transmission error, the Doppler shift and the signal transmission error of the satellite signal are acquired to generate an analog signal. The method has simple calculation process and low complexity, and better realizes the real-time performance of signal reception analysis, thereby more accurately simulating the received signal in a dynamic environment. The method for simulating GPS signal dynamic receiving environment and the system thereof are applied to the field of signal processing.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a GPS signal dynamic receiving environment simulation method and system. Background technique [0002] Navigation signal generators play an important role in both military and civilian fields. Take the GPS signal generator as an example, such as Agilent's E4438C ESG vector signal generator and option 409GPS special software used by many research institutions. E4438C is a high-performance general-purpose RF signal generator that can provide a real-time high-precision test environment. Another example is the GSS4200 multi-channel GPS signal simulator developed by the British SPIRENT Communications Company, and the CCSG2200 satellite signal simulator developed by the American Computer Application Software Technology Co., Ltd. These GPS signal sources can simulate civilian coarse (C / A) codes and military precise (P) codes on GPS L1, L2 frequencies. However, foreign products are ex...

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Problems solved by technology

[0075] In view of the problem in the prior art that the theoretical complexity of the satellite signal incident direction estimation in the signal dynamic receiving environment simulation process is high, the purpose of the present invention is to provide a GPS signal dynamic receiving environment simulation method, which first calculates the real-time Attitude angle, so as to calculate the real-time incident direction of the signal satellite, with low computational complexity, which better satisfies the real-time performance of signal receiving analysis, and thus more reliably simulates the receiving signal in a dynamic environment

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