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The SAR Passband Problem: Analytical Model and Possible Practical Solutions

机译：SAR通带问题：分析模型和可能的实际解决方案

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摘要

Recently equivalent radar cross section (ERCS) was introduced as a new radiometric measurement quantity for synthetic aperture radar (SAR) systems. The focus of this paper is the dependence of a point target's ERCS (which is proportional to the pixel intensity) on the passband of the measuring SAR system. The SAR passband is mostly defined by the range and azimuth apodization functions used for side-lobe control during processing. The core of the problem is that different SAR passbands lead to different radiometric measurement results despite radiometric calibration, a so far neglected fact. The problem is especially pronounced for high-resolution SAR systems, which become more and more available. To quantify the effect of the passband problem, an analytical model is developed and numerically verified with different examples. Finally, several approaches for resolving the SAR passband problem in the future are proposed, where passband standardization across SAR missions is favored from a point of view of accurate radiometric measurements. Tackling and resolving the passband problem will enable truly consistent and reproducible radiometric measurements across SAR beams, modes, and systems.
机译：最近，等效雷达横截面（ERCS）被引入作为合成孔径雷达（SAR）系统的新辐射测量量。本文的重点是点目标的ERCS（与像素强度成正比）对测量SAR系统通带的依赖性。 SAR通带主要由在处理期间用于旁瓣控制的距离和方位变迹函数定义。问题的核心在于，尽管进行了辐射校准，但不同的SAR通带会导致不同的辐射测量结果，这是迄今为止被忽略的事实。对于高分辨率SAR系统而言，这个问题尤为突出，因为它变得越来越可用。为了量化通带问题的影响，开发了一个分析模型，并用不同的例子进行了数值验证。最后，提出了几种解决SAR通带问题的方法，从准确的辐射测量角度来看，跨SAR任务的通带标准化是有利的。解决和解决通带问题将实现跨SAR波束，模式和系统的真正一致且可重复的辐射测量。

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