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Coherent Doppler tomography-a technique for narrow band SAR

机译：相干多普勒层析成像-窄带SAR技术

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摘要

Some concerns regarding a technique of narrowband synthetic aperture radar (N-SAR) imaging called coherent Doppler tomography (CDT), which may be a good candidate for spaceborne applications, are addressed. Using a single-frequency signal, are addressed. Using a single-frequency signal, resolution of two tenths of a wavelength can be achieved in the point spread function if the radar platform circles the ground path to be imaged. However, the high sidelobe level of -8-dB in the point spread function results in an unacceptable dynamic range. To reduce the sidelobe level, two approaches are presented: coherent processing using multiple discrete frequencies and noncoherent subaperture processing. Simulation results demonstrate that the sidelobe level is substantially reduced by both methods. However, the resolution is degraded and the computational overhead is greatly increased for noncoherent subaperture processing. Also presented is a possible satellite geometry configuration that could utilize N-SAR processing to provide high-resolution global mapping capability.
机译：解决了有关被称为相干多普勒层析成像（CDT）的窄带合成孔径雷达（N-SAR）成像技术的一些问题，该技术可能是星载应用的良好候选者。解决了使用单频信号的问题。如果雷达平台环绕要成像的地面路径，则使用单频信号可以在点扩展功能中实现十分之一波长的分辨率。但是，点扩展函数中-8 dB的高旁瓣电平会导致动态范围无法接受。为了降低旁瓣电平，提出了两种方法：使用多个离散频率的相干处理和非相干子孔径处理。仿真结果表明，两种方法均显着降低了旁瓣电平。然而，对于非相干子孔径处理，分辨率降低并且计算开销大大增加。还介绍了一种可能的卫星几何结构，可以利用N-SAR处理来提供高分辨率的全局映射功能。

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