Abstract
In passive radar, estimation of the time delay and Doppler shift of a signal is necessary for detection processing. These systems are based on receiving a signal and determining the time delay and Doppler shift of the signal. A passive radar system employing multiple transmitters can geolocate targets based on this set of time delays. Typically, multiple transmitters each transmit an independent signal, and the receiver must observe the direct path to each transmitter. However, in the case of a coordinated set of transmitters, the receiver only has to observe a single direct path. Such a configuration may arise where there is control over the transmitters or where there are multiple repeaters setup with a known time delay between the transmissions. Here, a maximum likelihood estimator is presented for the coordinated transmitters. Using this estimator, the time delay estimation can be improved over the independent transmitter case.
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