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
CN109324322AActive Publication Date: 2019-02-12CHINA ACAD OF LAUNCH VEHICLE TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA ACAD OF LAUNCH VEHICLE TECH
Publication Date
2019-02-12

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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.
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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...

Claims

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