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Broadband radar coherent clutter simulation method based on DEM data

A wideband radar and simulation method technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as not considering ground fluctuations and large amount of calculations

Active Publication Date: 2014-04-16
中国航天科工集团第二研究院二〇七所
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Problems solved by technology

[0004] The existing radar clutter simulation methods are mainly divided into two categories, one is the simulation method based on signal processing, which does not consider the fluctuation of the ground; the other is the method based on electromagnetic scattering calculation, but the calculation is very large

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  • Broadband radar coherent clutter simulation method based on DEM data
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  • Broadband radar coherent clutter simulation method based on DEM data

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Embodiment Construction

[0042] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] Such as figure 1 As shown, the wideband radar coherent clutter simulation method based on DEM data of the present invention comprises the following steps:

[0044] Step 1: Load simulation parameters, mainly including radar platform motion track, speed, antenna beam pointing, ground grid DEM data, and radar wavelength, pulse width, bandwidth, operating distance and antenna pattern, etc.;

[0045] Step 2: read in the data of the nth track point;

[0046] Step 3: Determine the position of the radar platform and the direction of beam irradiation;

[0047] Step 4: Combining with the antenna pattern, determine the irradiation area of ​​the radar;

[0048] Step 5: Take dθ and are the angular intervals of pitch angle and azimuth angle, and divide the ground scattering units along the azimuth and pitch directions, as shown in 4, the area ...

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Abstract

The invention belongs to the technical field of radar simulation, and particularly relates to a broadband radar coherent clutter simulation method based on DEM data. The broadband radar coherent clutter simulation method comprises the following steps that firstly, simulation parameters are loaded; secondly, data of a nth flight path point are read; thirdly, the radar platform position and the sum beam irradiation direction are determined; fourthly, the radar irradiation area is determined through an antenna pattern; fifthly, a ground scattering unit is divided in the azimuth direction and the pitching direction at intervals with dtheta and dphi serving as the pitching angle and the azimuth angle respectively, and the area of the scattering unit is calculated; sixthly, the voltage power and amplitude of an echo of the scattering unit are calculated according to the radar equation; seventhly, an echo voltage signal of the scattering unit is calculated according to the obtained clutter amplitude and the characteristics of an LFM signal; eighthly, the position of the echo of the scattering unit in radar echo data is calculated; ninthly, coherent combination is carried out on the echo voltage signal of the scattering unit; tenthly, whether n is smaller than N or not is judged, if yes, simulation is finished, or otherwise, the second step is repeatedly executed. Complex electromagnetic scattering calculation is not carried out under the situation that ground up and down changes are taken into consideration.

Description

technical field [0001] The invention belongs to the technical field of radar simulation, and in particular relates to a wideband radar coherent clutter simulation method based on DEM data. Background technique [0002] The radar system usually works in a certain ground environment. The radar echo from the ground enters the receiver together with the target signal and noise, forming clutter that interferes with the radar detection performance. With the continuous improvement of the sensitivity and precision of modern radar, the radar system is more and more affected by the ground clutter environment. To optimize the design of radar system, it is necessary to deeply understand and master the interaction between electromagnetic waves and clutter environment. [0003] Modern radar systems generally use broadband linear frequency modulation (LFM) signals to improve range resolution, and use directional antennas to transmit LFM signals. The LFM signals interact with targets and t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 耿旭朴崔亮董纯柱
Owner 中国航天科工集团第二研究院二〇七所
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