Development of a Practical Under-Snow Radar System for Searching Victims by Snwoslide and Lost Articles in Accumulated Snow

为了研制一种实用的雪崩遇难者和积雪中物品搜寻雷达系统，构建了一套全息雷达实验系统，并对积雪中掩埋的目标进行了成像实验。为实现一个实用的雷达系统。研究内容包括：（1）实时系统;（2）小型系统。(3)高分辨率的系统。关于项目（1）。通过使用最近开发的DSP（数字信号处理器）来实现准实时信号处理。在研究的前半阶段。发射和接收天线机械地扫描在干燥的雪的二维表面上。需要花费大量时间来获得足够的数据以重建雷达图像。为了克服这一困难，在最后一年的研究中，构建了一个具有16个阵元的旋转线性天线阵。该阵列系统的实验结果表明， ...更多信息 实时雷达系统关于项目（2）。微型计算机用于收集雷达信号并对其进行处理，从而形成了小型实验系统。关于项目（3）。研究了全息成像雷达在分辨率方面的优势，其中三维（3-D）雷达图像被重建。雷达图像诊断是利用雪季野外试验采集的雷达数据进行的，通过改变观测者的视角，将三维雷达图像投影到二维CRT显示器上进行观测。通过这种诊断技术，即使在低分辨率的系统中也可以获得与高分辨率相当的雷达图像，从而证实了该技术在实际应用中的有效性。针对三维雷达图像存储和显示需要大容量存储系统的问题，设计并构建了一种专用的存储系统。该存储系统已在实验雷达系统中实现，并证明了该存储系统的有效性。少

An experimental system of holographic radar was constructed in order to develop a practical radar system for searching victims by snowslide and lost articles in accumurated snow and experiments on imaging targets buried in accumurated snow were conducted. For realizing a practical radar system. following research items were investigated: (1) real-time system, (2) small-sized system. (3) system with high resolution. Concerning item (1). a quasi-real-time signal processing was achieved by using a recently developed DSP ( Digital Signal Processor ). Since in the first half stage of the research. a transmitting and receiving antenna was mechanically scanned over two-dimensional surface of accumurated snow. it took much time to obtain sufficient data for reconstruction of radar images. To overcome this difficulty a rotating linear antenna array with 16 array elements was constructed in the final research year. The experimental result of the array system showed the possibility of achieving a … More real-time radar system. Concerning item (2). microcomputers were used to collect radar signals and to process them, resulting in the small-sized experimental system. Concerning item (3). advantages of a holographic imaging radar with respect to the resolution was investigated, where three-dimensional (3-D) radar images were reconstructed. Diagnosis of radar images was done with radar data collected by field experiments in snow seasons, where the projected 3-D radar images onto 2-D CRT scope were observed by changing the point of view of an abserver. By this diagnosis technique radar images equivalent to those of high-resolution can be obtained even in a system of low resolution, resulting in confirmation of the effectiveness of the technique for practical use. Since a memory system of large capacity is necessary to store and to display 3-D radar image, a special memory system was design and constructed. This memory system was implemented in the experimental radar system and usefulnes of the memory system was demonstrated. Less