Measuring Method of Target Elevation Angle of Meter Wave Array Radar Based on Multi-frame Information Fusion

Abstract

The invention belongs to the technical field of radar target elevation measurement and particularly relates to a multi-frame information fusion based meter wave array radar target elevation measuring method. The multi-frame information fusion based meter wave array radar target elevation measuring method comprises the following steps of obtaining the beam width of a radar beam scanning chart and the number of peak points in the radar beam scanning chart; determining the number of angle search intervals contained within an airspace action angle range at the elevation of a radar and the number of search intervals contained in the beam width of the radar beam scanning chart; obtaining echo data of distance units on which K frames of targets are arranged; obtaining a beam scanning matrix; performing beam forming on the echo data of the distance units on which the K frames of targets are arranged through the beam scanning matrix, obtaining a beam forming vector of every frame of data and forming into a beam forming matrix; extracting serial numbers of m data with maximum amplitude in every beam forming vector and forming into an information matrix; performing information fusion on the information matrix and obtaining a target elevation measured value.

Description

technical field [0001] The invention belongs to the technical field of radar target elevation angle measurement, in particular to a meter wave array radar target elevation angle measurement method based on multi-frame information fusion. Background technique [0002] Meter wave radar has unique advantages in over-the-horizon detection and anti-electronic interference, and has been widely valued in recent years. However, due to the long wavelength of the transmitted signal of the meter wave system radar, according to the antenna theory, the antenna beam width is proportional to the physical aperture of the antenna. Under the same antenna aperture, the beam width of the meter wave system radar is relative to the beam width of the microwave system radar. greatly increase. Therefore, when detecting a target at a low elevation angle, the radar beam hits the ground, and the direct wave of the target and the multipath reflected wave reflected by the ground (sea) surface are superi...

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Problems solved by technology

When the signal-to-noise ratio of the radar received signal is high, the RML method has good angle measurement accuracy. However, when the received signal is processed by the RML method, the beam scanning pattern of the received signal will appear a high-amplitude grating lobe. In the case of signal-to-noise ratio, these grating lobes will seriously affect the radar's measurement of the target elevation angle (height)

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