Gross Errors in Height Indication from Pulsed Radar Altimeters Operating over Thick Ice or Snow

A. Waite, S. J. Schmidt
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引用次数: 102

Abstract

Errors reported in 1946 by aircraft pilots using pulsed radar altimeters over Antarctic ice, coupled wih results of radio-wave propagation studies in both polar areas (1946-1955), led to measurements of the electrical characteristics of thick ice at high and ultra-high frequencies. These measurements produced information relative to dielectric constants, loss factors, scattering, and interface reflection data that subsequently permitted successful radio-wave penetration measurements in continental ice to depth of several hundred feet in both the Antarctic and the Arctic (1958-1960). Results indicated clearly that low-flying pilots relying on pulsed 440-Mc altimeters in poor visibility over thick ice can be fatally misled by errors inherent in these instruments. The paper presents recent data obtained by the Signal Corps pertinent to radio-wave transparency of thick ice and snow.
在厚冰或厚雪上工作的脉冲雷达高度计的高度指示的严重误差
1946年飞机飞行员在南极冰层上使用脉冲雷达高度计报告的错误,加上在两极地区进行的无线电波传播研究的结果(1946-1955年),导致厚冰在高频和超高频下的电特性测量。这些测量产生了与介电常数、损耗因子、散射和界面反射数据相关的信息,这些数据随后使得在南极和北极大陆冰层中成功地进行了深度达数百英尺的无线电波穿透测量(1958-1960)成为可能。结果清楚地表明,在厚冰上能见度低的情况下,依靠440-Mc脉冲高度计进行低空飞行的飞行员可能会受到这些仪器固有误差的致命误导。本文介绍了信号部队最近获得的有关厚冰雪无线电波透明度的数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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