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应用被动毫米波技术对冬夏两季环境下随斜距而变化的金属物体信号特征进行了分析。1978年,用装在 UH—1陆直升机旋转平台上的35GHz传感器在格里费斯空军基地(GrffissAFB)完成了两个测量阶段的试验。大部分数据是在斜距为30m—150m,视场角约为4°,仰角为60°,转速为4转/秒条件下收集的。用主动式35GHz 传感器也收集了有限的数据。数据分析表明,在波束充满的范围内有可能探测雪中面积约为3×6m~2的金属目标。在较大范围内,树木和凸凹不平之处都会产生严重干扰(目标信号特征的)信号。根据不同地形和天气条件下预定的扫描几何形状计算了随斜距,门限电平及视场角而变化的假信号密度。
The passive millimeter-wave technique was used to analyze the signal characteristics of metal objects changing with the slope distance in winter and summer. In 1978 two tests were completed at Griefiss AFB on a 35GHz sensor mounted on a rotating platform of a UH-1 land helicopter. Most of the data was collected at a slant range of 30m-150m with a field of view of about 4 °, an elevation of 60 ° and a speed of 4 rev / sec. Limited data is also collected with active 35GHz sensors. Data analysis shows that it is possible to detect the metal target in the snow area of about 3 × 6m ~ 2 within the beam full range. To a large extent, trees and irregularities produce signals that seriously interfere with the characteristics of the target signal. The ghost signal density, which varies with the slope distance, the threshold level and the angle of view, is calculated based on the predetermined scanning geometry under different topography and weather conditions.