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Airborne multi-antenna SAR chromatography three dimensional imaging system and imaging method thereof

A three-dimensional imaging, multi-antenna technology, applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve problems such as limiting the application of SAR tomographic three-dimensional imaging, increasing imaging costs and flight risks, etc. To achieve the effect of reducing flight risk

Inactive Publication Date: 2011-10-19
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

(3) Large-scale, high-density flight increases the cost of imaging and flight risk
This limits the application of SAR tomographic 3D imaging on airborne platforms

Method used

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  • Airborne multi-antenna SAR chromatography three dimensional imaging system and imaging method thereof
  • Airborne multi-antenna SAR chromatography three dimensional imaging system and imaging method thereof
  • Airborne multi-antenna SAR chromatography three dimensional imaging system and imaging method thereof

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Embodiment Construction

[0102] Parameter pairs using airborne radar E-SAR Figure 7 The target area shown is simulated for an imaging simulation of a multi-antenna system.

[0103] The standard flight altitude of the carrier aircraft is 7000m, the radar depression angle θ=45°, the working wavelength is 0.0313m, the PRF is 1.2kHz, the pulse width is 8μs, the chirp frequency is 12.5MHz / μs, the azimuth beam width is 17°, and the pitch direction is 17°. Beam width 30°. The distance between the antennas is 0.8m, the number of antennas is 9, and the transmission / reception shares one antenna, and the other 8 antennas are receiving antennas. In the imaging area, the height of the first step (area B) is 40m, and the height of the second step (area C) is 80m. When the scattering coefficient is between 84.84-318.15m (area A, B), it obeys a complex Gaussian distribution with an average value of 4 and an intensity of 5dB; between 318.15-466.62m (area C) it obeys a complex Gaussian distribution; the scattering ...

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Abstract

Provided is an airborne multi-antenna SAR chromatography three dimensional imaging system and an imaging method thereof. The invention is directed to the field of electronic signal processing technology and particularly relates to an SAR (Synthetic Aperture Radar) chromatography three dimensional imaging technology. According to the invention, a multi-antenna system structure is used to realize an SAR chromatography three dimensional imaging characterized by low flight risk, high resolution and large range. A multi-antenna working mode of single reception and multiple transmissions is adopted to reduce a loader load; meanwhile the possible imaging height scope is enlarged twice. An imaging method based on signal sparse expression is employed to realize a single flight super-resolution three dimensional imaging of the multi-antenna system. After the multi-antenna system structure is adopted, it requires less flight times to realized the three dimensional imaging. Meanwhile, the design of each flight locus is more flexible. Spaces are expanded for the application of SAR three dimensional imaging technologies in the airborne platform.

Description

technical field [0001] The invention belongs to the technical field of electronic signal processing, and relates to space remote sensing and space-to-earth observation information processing technology, in particular to airborne SAR (Synthetic Aperture Radar, synthetic aperture radar) tomographic three-dimensional imaging technology. Background technique [0002] SAR is an important milestone in the development of radar technology in the 20th century. It uses the correlation of radar echo signals to accumulate the Doppler frequency shift of echo signals during radar movement, and synthesizes an equivalent radar aperture in the direction of radar movement. Realize high-resolution imaging in azimuth. Because SAR adopts an active working mode, it performs imaging processing on the reflected echoes of electromagnetic waves emitted by itself, and is not limited by external environments such as light and temperature. It can realize all-day and all-weather regional monitoring and i...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/28
Inventor 闵锐杨晓波王金峰胡雅婷皮亦鸣曹宗杰范录宏李晋
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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