Moving targets are a real threat to pulse compression radars, especially
those operating with Doppler-intolerant waveforms. As the Doppler
frequency increases, the radar system performance degrades accordingly.
In the case of high-speed targets, the Doppler frequency is high enough
to distort the received signal, and consequently, the matched filter
output is distorted. Therefore, no target information could be
extracted. In this paper, we introduce a new Doppler compensation (DC)
and estimation technique for phase-coded pulse compression radars to
allow the detection of high-speed targets. Moreover, their Doppler
frequency value is estimated without ambiguity from one burst and
without the need for a range-Doppler module. In addition, the proposed
method does not require a synchronization system to perform its
function. As such, the implementation of the proposed method is simple
and inexpensive. The performance evaluation of the new method shows its
superiority in compensation and estimation when examined under higher
Doppler frequency and noise compared to a conventional radar.
Specifying parameters of high‐speed targets as range and velocity in radar systems operating with phase‐modulated signals is a problematic process because of the serious effect of high Doppler frequency on these types of waveforms. In the existence of a high‐speed target, its Doppler frequency will be very high such that it totally changes the phase sequence of the received signal. As a result, the matched filter output will be distorted. Therefore, estimating target parameters will be impossible. In this letter, a new method is proposed for detecting and estimating velocity of high speed targets using phase‐modulated signals. The suggested technique methodology depends on compensating the target high‐Doppler frequency for signal recovery using a customized waveform shape. Moreover, the Doppler frequency value is estimated without ambiguity from one pulse, and without the need for a range‐Doppler module. As such, the implementation of the proposed method is simple and inexpensive. The performance evaluation of the new method shows its superiority in compensation and estimation compared to other techniques when examined under higher Doppler frequency and noise compared to the conventional radar.
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