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7. Conclusion
In this chapter, we review different novel methods in joint time delay and Doppler estimation.
Each of them has some advantages and disadvantages. The disadvantages are studied and
we find a new method which can almost obviate the most of these disadvantages. The new
method is based on moment. It exploits the time delay, Doppler, and noise effects exerted onto
the moments of the received data. The insight on the moments of the received signal is the
criteria for joint estimation of time delay and Doppler. Since the moments of the noise could
be obtained, these moments can facilitate separating the main signal from the noise even in a
severe noisy environment. So, our estimation in low SNR has suitable results. In addition, we
do not encounter with undesirable cross-terms discussed in WV method. After introducing
our estimation method, its application in Doppler radar is declared.
The estimated delay and Doppler are used in the target tracking and predicting the position
and velocity of the target in a noisy background. So it is applicable in the radar trackers. Test
results provide a plausibility of the both estimations and tracking. The estimated position
and velocity are completely accurate even in very low SNRs. The tracking can be extended
to multiple targets. Based on the features described for mono-target tracking, it is expected to
have acceptable results in multiple targets tracking. Multi tracking in low SNRs is one of the
most important roles of a Doppler radar which is reachable based on the presented method.
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