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Method for quickly simulating airborne phased array pulse Doppler (PD) radar clutter

A radar and clutter technology, applied in the field of airborne phased array pulse Doppler radar clutter simulation, can solve problems such as low clutter signal efficiency, achieve rapid simulation, improve PD radar clutter simulation efficiency, and improve clutter simulation efficiency. The effect of wave simulation efficiency

Active Publication Date: 2013-07-17
北京理工雷科电子信息技术有限公司
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Problems solved by technology

Due to the large area of ​​the airborne PD radar clutter area, and with the improvement of the radar resolution, the number of grid divisions under the same clutter area continues to increase, and the efficiency of obtaining clutter signals by coherent superposition is obviously low. Not suitable for clutter simulation in large areas of high-resolution airborne PD radar

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  • Method for quickly simulating airborne phased array pulse Doppler (PD) radar clutter
  • Method for quickly simulating airborne phased array pulse Doppler (PD) radar clutter
  • Method for quickly simulating airborne phased array pulse Doppler (PD) radar clutter

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Embodiment Construction

[0027] The implementation of the method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] Select a SAR image to carry out the simulation experiment of airborne PD radar clutter. The simulation output is the clutter data of each pulse repetition period, and the range-Doppler is obtained by FFT in the slow time dimension (reception repetition period). Frequency 2D clutter plot. Set the size of the SAR image to 4000×4000, the resolution to 5m, the C-band, the downward angle of view to 30°; The azimuth angle of the center of the lobe beam is 20°, the elevation angle is 20°, the radar works in the C-band with a wavelength of 0.05m, the radar transmit signal is chirp, the bandwidth is 8MHz, the sampling rate is 10MHz, and the time of transmitting signal is 4μs , the pulse repetition frequency is 10KHz, 20KHz, 80KHz respectively; the upsampling multiple is 8, and the number of simulated pulses is 128.

[0029] The fas...

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Abstract

The invention provides a method for quickly simulating airborne phased array pulse Doppler (PD) radar clutter. The method comprises the following steps of: selecting a synthetic aperture radar (SAR) image; dividing the whole clutter scene into rectangular scattering units, and regarding each scattering unit as a point scattering body distributed in the center of the unit; acquiring the initial backscattering coefficient of each scattering unit; dividing the clutter scene into equidistant rings; upsampling a transmitted signal of a PD radar, and performing fast Fourier transform (FFT) on an upsampling result to obtain U(omega); calculating the amplitude A of each scattering unit; calculating the radar backscattering coefficient of each equidistant ring; acquiring an impulse response function of a system, and performing FFT on the function to obtain H(omega); and multiplying U(omega) by H(omega), and performing inverse FFT on a multiplication result to obtain a clutter signal received in a period corresponding to a transmitted pulse. By the method, natural scene clutter is quickly simulated in the airborne PD radar system under the condition of high resolution.

Description

technical field [0001] The invention relates to a fast simulation method for airborne phased array pulse Doppler (PD) radar clutter, belonging to the technical field of airborne phased array pulse Doppler radar clutter simulation. Background technique [0002] Airborne phased array PD radar is one of the advantageous weapons for detecting low-altitude and ultra-low-altitude flying targets and slow-moving targets on land and sea, and plays a pivotal role in modern warfare. Since the radar works in the downward-looking state, the target echo is often submerged in strong clutter signals, which poses a great threat to target detection. Therefore, it is necessary to conduct sufficient research on the clutter characteristics in the radar working environment. When the actual measurement cost is too high, it is very valuable to provide clutter data through computer simulation: on the one hand, it is beneficial to understand the physical process of the interaction between electromag...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
Inventor 刘峰高立宁任昱晨孙晗伟
Owner 北京理工雷科电子信息技术有限公司
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