Time Delay Estimation

Abstract : We investigate the possibility of exploiting the properties of a detected Low Probability of Intercept (LPI) signal wave form to estimate time delay, and by geometry, angle of arrival. We consider the case where a highly correlated signal is received at two stationary passive receivers. The signal source is assumed stationary, and the signal waveform designed sot hat the ambiguity function has a sharp peak. We also restrict ourselves to low signal-to-noise rations, namely 10 dB and less. We also examine the minimum time-delay estimate error the Cramer-Rao bound. The results indicate that the method works well for highly correlated pulsed signals, and may prove useful for other types of signals, such as CW signals and pseudo-random noise.

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