Pulse signal-based rotating baseline interferometer phase calibration method

Abstract

According to the pulse signal-based rotating baseline interferometer phase calibration method provided by the invention, angle measurement error accumulation can be eliminated, the system angle measurement accuracy is improved, and the minimum error of an angle measurement result is ensured. Under the condition that the baseline rotation speed is set to be one circle per second, aiming at the problem that error accumulation is easily caused by a traditional method that data are continuously collected after a pulse signal is searched for the first time, angle measurement error accumulation is eliminated by searching the pulse signal of the rotating baseline phase interferometer once every two seconds, and the angle measurement accuracy of a system is improved; and aiming at the problem of angle measurement errors caused by the fact that the initial time of data acquisition is possibly in the middle of pulse signals when the pulse signals are searched for each time in the traditional method of acquiring data in one second when the pulse signals are searched for each time, azimuth angle deviation is eliminated by searching the pulse signals of the rotating baseline phase interferometer once every two seconds, and the minimum error of an angle measurement result is ensured.

Description

technical field [0001] The invention relates to the technical field of phase interferometer direction finding, in particular to a phase calibration method for a rotating baseline interferometer based on a pulse signal. Background technique [0002] The direction finding method of the rotating phase interferometer is to make the real phase difference between the array elements change according to the cosine law through the rotation of the antenna coil around the axis, and then judge the extreme value to find the unambiguous phase difference, and realize the method of deambiguity. The rotating baseline method can measure azimuth and elevation angles simultaneously. According to the angle measurement principle of the rotating baseline phase interferometer, the determination of the azimuth angle is related to the moment when the baseline rotates from the initial position to the maximum value of the phase difference. Therefore, the calibration of the initial position is very impo...

AI Technical Summary

Problems solved by technology

[0006] In the method of continuously collecting data after the pulse signal is searched for the first time, the longer the cumulative delay time of the pulse signal is accumulated over time, the more the time when the phase maximum value appears will move backward or forward, which eventually leads to angle measurement The results show a large drift

[0007] The method of collecting data for one second every time a pulse signal is found, although the angle measurement is correct in some cases, but the angle cannot be measured normally when the initial data collection is in the middle of the pulse signal, and there is a high probability of angle measurement error

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