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Method for the Sea Clutter Characterization in HF Surface Wave Radars From the Fields Diffracted by the Sea Surface
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing ( IF 5.5 ) Pub Date : 2020-01-01 , DOI: 10.1109/jstars.2019.2963404
Omar Nova , Christophe Guiffaut , Alain Reineix

A new method for the characterization of the sea clutter in high-frequency surface wave radars is presented. The method is applied for the bistatic and the monostatic case. This method is based on the discretization of the sea surface in multiple patches. The fields diffracted by each patch are determined. Subsequently, the voltage that the diffracted fields induce on the receiving antenna is calculated. The sum of the voltages induced by all the patches is the sea clutter to be characterized. The fields diffracted by the sea patches are characterized in the form of field charts on a Huygens surface surrounding each patch. Field charts are modeled by analytical expressions. The current induced on the receiving antenna by the diffracted fields is calculated by means of the Lorentz reciprocity theorem. The feasibility of the method of characterization of the sea clutter is verified by means of the characterization of the fields diffracted by a single patch. The calculation of the induced current is done using the diffracted fields that are reconstructed from the analytical expressions that model them. It is also verified that the transmitting and receiving antenna can be replaced by plane wave sources, in order to simplify the calculations of the radiated fields that take part in the Lorentz reciprocity theorem. As a validation of the proposed method, the Doppler spectrum of a moving sea surface is calculated for the monostatic case.

中文翻译:

海面衍射场高频面波雷达海杂波表征方法

提出了一种表征高频面波雷达海杂波的新方法。该方法适用于双基地和单基地情况。该方法基于海面在多个斑块中的离散化。确定每个补丁的衍射场。随后,计算衍射场在接收天线上感应的电压。由所有贴片感应的电压总和就是要表征的海杂波。海块衍射的场以围绕每个海块的惠更斯表面上的场图的形式进行表征。现场图由分析表达式建模。由衍射场在接收天线上感应的电流是通过洛伦兹互易定理计算出来的。通过对单个斑块衍射场的表征,验证了表征海杂波的方法的可行性。感应电流的计算是使用衍射场完成的,这些衍射场是从对其建模的解析表达式中重建的。还验证了发射和接收天线可以用平面波源代替,以简化参与洛伦兹互易定理的辐射场的计算。作为对所提出方法的验证,针对单站情况计算了移动海面的多普勒频谱。感应电流的计算是使用衍射场完成的,这些衍射场是从对其建模的解析表达式中重建的。还验证了发射和接收天线可以用平面波源代替,以简化参与洛伦兹互易定理的辐射场的计算。作为对所提出方法的验证,针对单站情况计算了移动海面的多普勒频谱。感应电流的计算是使用衍射场完成的,这些衍射场是从对其建模的解析表达式中重建的。还验证了发射和接收天线可以用平面波源代替,以简化参与洛伦兹互易定理的辐射场的计算。作为对所提出方法的验证,针对单站情况计算了移动海面的多普勒频谱。
更新日期:2020-01-01
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