Accurate Delay Estimation for Multisensor Passive Locating Systems Exploiting the Cross-Correlation Between Signals Cross-Correlations

The availability of accurate estimates the delay or time arrival incoming signals is paramount importance for position estimation in passive radars with multiple receivers. This correspondence aims at improving delays by detectors exploiting cross-correlation between (say cross-cross-correlation) received signals. resulting equation system formulated as a least squares minimization problem, whose solution efficiently found computing pseudoinverse model matrix. In fact, cross-cross-correlation implicitly performs filtering operation on considered signal, approximating generalized cross-correlator behavior, without using statistical information about signal spectra. proposed method numerically validated comparison classic counterparts and theoretical bounds.