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HYBRID AMPLITUDE/PHASE COMPARISON DIRECTION FINDING SYSTEM
HYBRID AMPLITUDE/PHASE COMPARISON DIRECTION FINDING SYSTEM
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机译:混合振幅/相位比较方向查找系统
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摘要
A hybrid amplitude/phase comparison direction finding system for aircraft, employing a unique calibration system to compensate for tolerance variations in the antennas. The calibration system utilizes a programmable read only memory (PROM) (34) for each antenna pair (30), wherein calibration data from pre-measured antenna patterns of the associated antennas are stored. The calibration data preferably includes measured relative amplitude (electromagnetic field strength) and phase data (46), as a function of frequency and angle from a common reference plane, for the associated antenna pair. This calibration data is stored in a PROM which is preferably disposed within an assembly which includes the antenna pair. A system processor (45) can then retrieve the calibration data during system operation, whereupon angle of arrival measurements can be performed with improved accuracy.
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