合成孔径侧视雷达是有源的微波成像设备。如同航空摄影一样,可用其把被摄目标收集在图像中,所不同的是:航空摄影时依靠日光照明,而雷达则通过自身发射的电磁波照射目标;此外,摄影像片上的影像反映的是目标的视觉形像,而雷达图像上的影像则反映目标的回波特性。它们都表现为底片上的密度分布(或灰度分布)。正是由于上述不同,从雷达图像分析、解译目标时,必须进行两方面的研究:其一是目标的反射率特性,目标回波是由其后向反射(或称后向散射)造成。这一研究已进行多年,积累了大量的数据和理论研究成果,形成目标反射的波谱特性理论。其 Synthetic aperture side-looking radar is an active microwave imaging device. Like aerial photography, it can be used to capture the subject in the image collection, the difference is: aviation photography rely on daylight lighting, and the radar is through its own emission of electromagnetic radiation target; In addition, the photographic images on the image reflects the goal The visual image of the radar image reflects the echo characteristics of the target. They all appear as density distribution (or grayscale distribution) on the film. It is because of the above differences that two aspects must be studied when analyzing and interpreting the target from the radar image: one is the target’s reflectivity characteristic, and the target echo is caused by its backward reflection (or backscattering). This research has been for many years, has accumulated a large number of data and theoretical research results, the formation of the target reflection of the spectral characteristics of the theory. its