Satellite-borne three-array-element monopulse two-dimensional direction finding method

Abstract

The invention discloses a satellite-borne three-array-element monopulse two-dimensional direction finding method. The satellite-borne three-array-element monopulse two-dimensional direction finding method comprises the following steps: firstly, maximum baseline limit is calculated according to the minimum wavelength of received signals and the amplitude comparison angle measurement accuracy, the minimum baseline length requirement is calculated according to the required angle measurement accuracy and the maximum wavelength of the received signals, the maximum and minimum baseline requirementsare compared, and the length of baselines is determined; an amplitude difference tablet and a phase difference tablet which correspond to incident signals in different directions are calculated according to the antenna interval, the antenna wave beam directional angle and an amplitude and phase directional diagram; then the amplitude difference of the same signal is received through three array elements to be related to the amplitude difference tablet, and rough finding values of the signal incident directions are obtained; and finally, the search range of the signal incident directions is determined through the rough finding result and direction finding accuracy of amplitude comparison direction finding, the phase differences between three channels are related to the phase difference tablet to be interpolated, and then the fine finding angle result is obtained. By decreasing the number of the array elements and the system channels and the quantity of system equipment, the direction finding accuracy of a satellite-borne warning system is effectively improved.

Description

technical field [0001] The invention belongs to the field of electronic signal reconnaissance, and in particular relates to a single-pulse two-dimensional direction-finding method of a spaceborne three-array element. Background technique [0002] In order to deal with the threat of anti-satellite weapons and adapt to the complex electromagnetic environment, it is urgent to develop an effective space-borne broadband radar warning and direction-finding system. Traditional radar warning systems often use amplitude direction finding technology, which is widely used in airborne platforms. The traditional amplitude ratio direction finding technology uses the amplitude comparison of the received signals of two channels to find the direction. This method is sensitive to the signal-to-noise ratio of the received signal, and its angle measurement accuracy is about one-tenth of the 3dB beamwidth. For the radar warning antenna unit, due to the large instantaneous coverage required, its...

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Problems solved by technology

[0004]The purpose of the present invention is to provide a single-pulse two-dimensional direction-finding method with three space-borne three-array elements, which solves the problem of low direction-finding accuracy in traditional radar warning systems. Combining the advantages of the ratio-amplitude direction finding and the phase-comparison direction finding, making use of the high precision of the phase-comparison direction finding to make up for the defect of the low accuracy of the ratio-amplitude direction finding, and improving the direction-finding accuracy of the system through long-baseline interference direction-finding

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