Doppler Signature Measurements of an Mi-24 Hind-D Helicopter at 92 GHz

摘要

This report describes millimeter wave Doppler signature measurements made on a hovering Mi-24 Hind-D helicopter. The measurement system, a CW sensor operating at 92 GHz, is described in detail. The recording system consisted of a high speed A/D board installed in a dual Pentium computer running Windows NT. The report presents the results of the Doppler analysis of the data. The signatures created by the rotating blades of the jet turbines known as jet engine modulation (JEM) lines and the Doppler signature components created by the many moving parts of the main and tail rotor assemblies are discussed in detail and a comparison to the theoretical values is presented.