Antenna array atmosphere phase disturbance correction method and system

Abstract

The invention relates to an antenna array atmosphere phase disturbance correction method and system. The method comprises steps of: based on a satellite navigation system, measuring carrier phase of the same satellite at two positions by using time of atomic clock time synchronization measurement, so as to obtain a first carrier phase and a second carrier phase; differentiating the first carrier phase and the second carrier phase, so as to obtain carrier phase single difference data; differentiating the carrier phase single difference data and satellite epoch single difference data, so as to obtain carrier phase double difference data; performing phase correction on the carrier phase double difference data, so as to obtain atmosphere phase difference data of two positions; and correcting antenna array atmosphere phase disturbance according to atmosphere phase difference data of two positions, and when an ionosphere disturbs the atmosphere phase, calculating phase disturbance of ionospheres and tropospheres of different frequencies for antenna array atmosphere phase separately. The method and system overcome defects of fewer calibration sources or poor real-time performance in the conventional method, can correct atmosphere phase disturbance in real time, have high correction accuracy and can be used widely.

Description

technical field [0001] The invention relates to the field of deep space exploration, in particular to an antenna array atmospheric phase disturbance correction method and system. Background technique [0002] The signal correlation and synthesis performance of antenna array depends on the signal-to-noise ratio of each antenna, the phase difference estimation and phase correction accuracy between signals. When the target signal strength is high enough, the phase difference between the antenna elements can be estimated and corrected by short-term correlation. When the signal is very weak, in order to achieve a sufficient signal-to-noise ratio, a long integration time is required during correlation; and the phase fluctuation of each antenna signal is caused by the disturbance of the earth's tropospheric atmosphere, which leads to the deterioration of the long-term correlation between antenna signals , thus seriously affecting the synthesis performance of the signal. Especiall...

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Problems solved by technology

The phase correction of signal propagation can also be realized by using GPS time delay measurement, and the price is cheap, but the delay time of the traditional GPS measurement method is too long, and it is difficult to achieve 12 hours of calculation delay to achieve millimeter-level and higher accuracy Real-time correction, currently mainly used in the field of weather forecast with low real-time requirements

DSN has carried out a comparison test between the water vapor radiometer and the calibrated antenna time delay measurement, which shows that the water vapor radiometer can effectively detect the atmospheric humidity delay, which is one of the key development directions of atmospheric phase disturbance correction measurement, but the radiometer has distortion and saturation problem

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