Exact Angular Accuracy of an Amplitude Comparison Sequential-Lobing Processor |
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Authors: | Lank GW Pollon GE |
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Institution: | Technology Service Corp. Santa Monica, Calif. 90401; |
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Abstract: | Assume E1 and E2 are the squares of two sequential envelopes from the sequential lobing of an antenna in a given plane. Independent thermal noise is generally present in the envelopes. The statistic e = (E2 ? E1)/(E2 + E1) has been used as an estimate of the angle to a target for the significant region of small angles compared to a beamwidth. For a nonfading target, the probability density and characteristic function of e are obtained in closed form. Thence, the exact bias, standard deviation, and rms error in estimating the noise-free value e of e are obtained for all e and signal-to-noise ratios. The same type of statistic as e can be used to estimate time delay in a split range gate tracker. |
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