The Interferometric Radiometry Geolocation Of Millimeter Wave Signals

LT Erik Lee, USN

Millimeter wave radars and communication systems are being widely proliferated around the world. Such systems are very challenging to geolocate by traditional methods such as angle of arrival, time difference of arrival, or frequency difference of arrival. This is largely due to the small antenna beamwidths and the short on-time of some of these systems which reduces the signal to noise ratio at a collector’s receiver and negatively impacts the probability of intercept. This thesis explores the application of interferometric radiometry to the millimeter wave geolocation problem. By trading a high gain collector antenna for a low gain antenna, the collector’s antenna beamwidth increased improving general search and probability of intercept. The reduced gain was overcome by integrating over longer time periods which increased signal to noise ratio and allowed millimeter wave signals to be geolocated. Poor angular resolution was improved using interferometry and wider antenna baselines. Interferometric radiometry geolocation was shown to be a valid geolocation method that led to increased geolocation accuracies of millimeter wave signals.

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Jan 10, 2016

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