Direction finding and target recognition method based on passive phased array antenna

A phased array antenna and target recognition technology, applied in the field of radar radiation source target detection, can solve the problems of ambiguity in direction finding and low accuracy in angle measurement, and achieve the effects of increasing dimension, reducing calculation amount, and improving speed

Active Publication Date: 2019-02-12
CHINA ACAD OF LAUNCH VEHICLE TECH
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Problems solved by technology

[0011] The technical problem of the present invention is: to overcome the deficiencies of the existing technology, a digital beamforming method based on a circular passive phased array antenna is proposed, which solves the problems of fuzzy direction measurement and low angle measurement accuracy of the traditional interferometer method

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  • Direction finding and target recognition method based on passive phased array antenna
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  • Direction finding and target recognition method based on passive phased array antenna

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Embodiment Construction

[0053] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0054] The invention is based on the antenna structure of the annular passive phased array, adopts the digital beam forming method, and improves the detection distance and angle measurement accuracy of the radiation source; for the multi-period radar signals received in the actual passive radar processing system, based on the short-time Fourier The concept of transformation uses the variable-scale sliding window short-time FrFT method to complete the extraction of signal period feature information, and finally completes the radiation source identification, which solves the problem that the traditional method has a large amount of data, heavy computing load, and the time-domain period information of the signal is easily submerged in the transformation. Problems in the distribution of spectral lines in the domain.

[0055] Such as figure 2 Sh...

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Abstract

The invention discloses a direction finding and target recognition method based on a passive phased array antenna. The method is based on an annular passive phased array antenna structure, and a digital beam forming method is adopted, so that the radiation source detection distance and the angle measurement precision are improved; and aiming at a multi-period radar signal received in an actual passive radar processing system, based on an idea of short-time Fourier transform, period characteristic information of the signal is extracted by adopting a variable-scale sliding window short-time Fourier transform FrFT method, and finally a radiation source is identified, so that the problems that a traditional method is large in data amount and high in operation load, and time domain period information of the signal is easily submerged in spectral line distribution of a transform domain are solved.

Description

technical field [0001] The invention relates to a passive high-precision direction finding and target recognition method, which is suitable for the detection of radar radiation source targets. Background technique [0002] In the application scenario of long-distance electronic reconnaissance over the sea, passive radar is often used to detect radiation sources. Current passive radar radiation source systems generally use phase interferometers or monopulse-amplitude direction finding, and time-frequency analysis methods are used for parameter measurement. For the traditional passive radar radiation source detection system, the existing direction finding and target recognition methods have the following problems: [0003] (1) The gain of the passive radar antenna of the phase-comparison system using the phase interferometer for direction finding cannot be synthesized, the working distance is limited, and the angle measurement will be ambiguous in the X and above frequency ban...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/02G01S13/04G01S13/00
CPCG01S13/006G01S13/02G01S13/04G01S2013/0245
Inventor 刘韵佛代威许元男刘红军王泽李志国王小辉吕殿君刘敏华蔡昱雷建长尹世明赵大海何超凡石铄
Owner CHINA ACAD OF LAUNCH VEHICLE TECH
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