Synthetic aperture radar echo simulation method suitable for a plurality of emission signal waveforms

A technology of synthetic aperture radar and signal transmission, which is applied in the directions of using re-radiation, radio wave measurement system, radio wave reflection/re-radiation, etc. It can solve the problems that are not conducive to the flexibility and fidelity of radar, and achieve flexible modeling Effect

Active Publication Date: 2017-01-04
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

The limitation on the transmit signal waveform is undoubtedly detrimental to the flexibility and realism of radar transmit signal modeling

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  • Synthetic aperture radar echo simulation method suitable for a plurality of emission signal waveforms
  • Synthetic aperture radar echo simulation method suitable for a plurality of emission signal waveforms
  • Synthetic aperture radar echo simulation method suitable for a plurality of emission signal waveforms

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[0023] The present invention will be further explained below in conjunction with the accompanying drawings. figure 1 The geometric schematic diagram of SAR imaging is shown in the three-dimensional geometric space. Without loss of generality, it can be assumed that the moving direction of the radar platform is the x-axis direction; the radar position coordinates are The coordinates of the scattering center are

[0024] The present invention is applicable to a synthetic aperture radar echo simulation method of various transmitted signal waveforms, and adopts five steps as shown in FIG. 3 .

[0025] Step 1: Set the radar transmission signal waveform s T (x,t r ), where t r Fast time for radar. Due to the motion of the radar platform, the x-coordinate of the radar position increases with the radar slow time t a And change. For a fixed radar position x-coordinate, s T (x,t r ) represents a specific slow time t a When the radar transmits the signal, its waveform can no...

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Abstract

The present invention relates to a synthetic aperture radar echo simulation method suitable for a plurality of emission signal waveforms. The method comprises the following steps: the step 1: setting radar emission signal waveform; the step 2: respectively performing the Fourier transform of each radar emission signal, and obtaining the radar emission signal frequency spectrum; the step 3: calculating a synthetic aperture radar transmission function; the step 4: multiplying the radar emission signal frequency spectrum obtained in the step 2 by the synthetic aperture radar transmission function obtained by the step 3, and obtaining the orientation time domain distance frequency domain spectrum of SAR echo signals; and the step 5: performing the inverse Fourier Transform of the obtained result along a distance frequency fr. The synthetic aperture radar echo simulation method suitable for a plurality of emission signal waveforms can flexibly select the emission signal waveform according to the real requirement to allow an SAR echo signal simulator to be more flexible and vivid for the modeling of the radar emission signals; and moreover, the modeling of the emission waveform, the radar work mode, the target scattering feature modeling and the modeling of the radar platform are relatively independent and have no mutual restriction.

Description

【Technical field】 [0001] The invention belongs to the field of synthetic aperture radar and signal processing, and in particular relates to a simulation technology of synthetic aperture radar echo signals, in particular to a synthetic aperture radar echo simulation method suitable for various transmission signal waveforms. 【Background technique】 [0002] Synthetic Aperture Radar (SAR) echo signal simulator plays an important role in researching SAR imaging algorithm and verifying SAR system scheme. At present, the existing SAR echo signal simulation technology can be used not only for traditional strip mode SAR, but also for multiple SAR data acquisition modes such as spotlight SAR and TopSAR; not only for traditional single-station SAR systems, but also for It is used in new system SAR systems such as dual-station SAR and SAR moving target indication. Some SAR echo signal simulation technologies consider factors such as secondary or multiple scattering of electromagnetic w...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40G01S13/90
CPCG01S7/4052G01S13/90
Inventor 王伟刘永才冯德军饶彬傅其祥潘小义顾赵宇代大海常宇亮
Owner NAT UNIV OF DEFENSE TECH
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