Doppler wave beam sharpening rapid imaging method of mechanical scanning radar

A technology of mechanical scanning and imaging method, applied in the field of signal processing, can solve the problem that the DBS imaging method cannot be applied to mechanical scanning radar, etc., and achieve the effect of increasing the scanning rate of the antenna, reducing the possibility of distortion, and increasing the speed.

Inactive Publication Date: 2011-09-07
XIDIAN UNIV
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Problems solved by technology

[0013] Aiming at the shortcoming that the current DBS imaging method cannot be applied to mechanical scanning radar, the present invention proposes a fast imaging method of Doppler beam sharpening for mechanical scanning radar, so as to improve the speed of signal processing and realize the real-time imaging function in engineering

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  • Doppler wave beam sharpening rapid imaging method of mechanical scanning radar
  • Doppler wave beam sharpening rapid imaging method of mechanical scanning radar
  • Doppler wave beam sharpening rapid imaging method of mechanical scanning radar

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Embodiment Construction

[0037] refer to figure 1 , the specific implementation process of the present invention is as follows:

[0038] Step 1. Calculate the constant accumulated number of radar pulses.

[0039] Install the mechanical scanning radar on a plane flying at a constant speed, and the antenna speed v can be obtained θ , radar beamwidth Δθ and radar pulse repetition frequency f r , using these mechanical scanning radar operating parameters, calculate the constant radar pulse accumulation number M:

[0040] M = Δθ v θ · f r .

[0041] Step 2. Calculate the sharpening ratio of Doppler beam sharpening.

[0042] Due to the Doppler bandwidth Δf of the antenna d It increases with the increase of the antenna scan angle, so the Doppler bandwidth Δf of the antenna d The number of frequency points within also increases accordingly. In order to obtain subgraphs with ...

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Abstract

The invention discloses a Doppler wave beam sharpening rapid imaging method of a mechanical scanning radar, which mainly solves the problem that the prior art cannot be applied to a mechanical scanning radar. The method comprises the following steps of: firstly determining a pulse accumulation number M and a sharpening ratio N, arranging echoes after the pulse compression into a distance-direction matrix according to a receiving order; taking out two small matrixes which has directional length of 2*M and are mutually overlapped M from the matrix according to the receiving order; respectively performing the Doppler central estimation on the two small matrixes; using two Doppler centers to compute an interpolation frequency point; meanwhile, using the latter Doppler centre to perform the directional Doppler central compensation on the latter small matrix; then performing the directional FFT (Fast Fourier Transform), using the interpolation frequency point to extract a sub-image from thedata behind the FFT, splicing the sub-image according to the receiving order to obtain a large image. Compared with the traditional DBS (direct broadcasting by satellite) imaging method, the Doppler wave beam sharpening rapid imaging method has low computation, and low requirement on the radar performance, and can be applied to the traditional mechanical scanning radar DBS imaging.

Description

technical field [0001] The invention belongs to the technical field of signal processing, relates to radar imaging, and can be used for real-time, rapid and large viewing angle ground imaging. Background technique [0002] Due to the different azimuths of the fixed targets on the ground in the beam irradiation area of ​​the airborne radar, the included angles between the line of sight and the velocity vector of the radar are also different, that is, they have different radial velocities relative to the aircraft and produce different Doppler frequency shifts. Doppler beam sharpening DBS is to split the fixed target echo beam in the same beam into several narrow sub-beams. Since different sub-beams have different azimuth angles and correspond to different Doppler frequencies, it can be obtained by dividing multiple Puller frequency separation separates different azimuth angles, effectively improving the radar azimuth resolution. [0003] The following relationship exists in t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
Inventor 李明左磊吴艳王亚军张晓伟张鹏罗小云李响
Owner XIDIAN UNIV
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