多頻段典型地表的雙站雷達散射回波預測

張元元; 吳振森; 曹運華; 張玉石

doi:10.11999/JEIT150301

多頻段典型地表的雙站雷達散射回波預測

doi: 10.11999/JEIT150301 cstr: 32379.14.JEIT150301

1.
(西安電子科技大學物理與光電工程學院西安 710071) ②(中國電波傳播研究所青島 266107)

基金項目:

國家自然科學基金(61172031)

計量
- 文章訪問數: 1415
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- 被引次數: 0
出版歷程
- 收稿日期: 2015-03-11
- 修回日期: 2015-06-29
- 刊出日期: 2015-11-19

Multi-band Bistatic Radar Echo Prediction from the Terrian Surfaces

1.
(School of Physics and Optoelectronic Engineering, Xidian University, Xi&rsquo
2.
(China Research Institute of Radiowave Propagation, Qingdao 266107, China)

Funds:

The National Natural Science Foundation of China (61172031)

摘要

摘要: 雙站雷達在反隱身、超低空防御方面具有獨特優(yōu)勢，但雙站測量裝置較為復雜，地表參數的準確獲取工作耗時耗力，且精度難以保證，地表雙站雷達散射數據極其匱乏。為解決上述問題，該文以L/S/X/Ku波段裸土、水泥地和粗糙沙地后向散射實測數據為例，忽略地表的精細結構，采用等效面散射模型和遺傳算法反演了各地表的等效介電常數和粗糙度參數，獲取其等效參數統(tǒng)計特征，實現對地表雙站雷達散射回波的預測。結果表明：該等效面散射模型保證了地表的后向和雙站散射回波預測精度；地表雙站雷達散射回波隨入射波頻率的增大而增大；隨散射角的增大先增大而后減小，并在鏡像方向出現最大值；隨散射方位角的增大，地表散射回波先減小而后增大，HH極化雙站散射回波的最小值一般出現在方位角處，而VV極化雙站散射回波的最小值位置隨入射角的增大從方位角向小角度方向偏移，并與入射波頻率、地表濕度以及粗糙度參數相關，該雙站散射特性可用于地表參數的反演以及目標的反隱身研究。
- 雙站地表散射 /
- 多波段測量 /
- 等效參數反演
Abstract: Bistatic radar has an advantage in the anti-stealth and low altitude defense, but the bistatic scattering data measured from the terrian surface are extremely scarce. To solve this problem, the genetic algorithms and the backscattering data from the soil, concrete and the sand surface in L/S/X/Ku band are used to retrieve the effective permittivity and the roughness parameters of the land, and then the bistatic scattering data are predicted. The research above proves that the land equivalent surface scattering model is effective. The bistatic scattering echo increases with frequency, and it first increases and then decreases along with the scattering angles, first decreases and then increases along with the scattering azimuth angles. The minimum value of the bistatic scattering echo always appears in the 90 degree azimuth angles for the HH polarization, and it shifts from 90 degree azimuth angles to the small angle direction for the VV polarization. And also it is related to incident frequency, the moisture and the roughness of land. The bistatic scattering characteristics of land surface can be used for the anti-stealth research and the inversion of the land parameters.
- Bistatic land scattering /
- Multi-band measurement /
- Equivilent parameters inversion

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