Millimeter-Wave Backscatter Measurements in Support of Surface Navigation Applications.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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Millimeter wave MMW short range radar systems have unique advantages in surface navigation applications, such as military vehicle mobility in inclement conditions, aircraft landing assistance and missile guidance. MMW radars systems have recently become commercially affordable, and are being developed for automobile collision avoidance applications. Two types of radar cross section RCS measurements were performed at 95 GHz. Grazing angle clutter data were obtained from common surfaces. The RCS of objects, commonly encountered by automobiles on the road, was also measured. In addition the received power statistics were investigated for both types of RCS measurements. Surface clutter from several surfaces, including asphalt, grass and snow, was measured at 7.5 and 5.0 deg grazing angles. The average normalized RCS values are presented for each surface. The received clutter power is compared to Rayleigh and Weibull probability distributions. For all distributed surfaces, the received power cumulative distribution function CDF best matches the Rayleigh assumption. The azimuthal RCS profile was measured and plotted for several roadside objects. These objects included both metal and wood sign posts and a section of guard rail. An average RCS value was also calculated for each object. The received power CDF was compared to the Rayleigh and Weibull distributions. The uniformly shaped targets, e.g., a round wood pole, best match the Rayleigh distribution. The majority of odd shaped objects best follow the Weibull assumption.
- Active and Passive Radar Detection and Equipment