Abstract

In the current generation of radar systems, linear frequency modulated continuous wave (LFMCW) radar are very popular owing to several attributes such as a large time-bandwidth product yielding high precision and good range resolution. However, the ambiguity function associated with a linearly chirped signal is in the form of a knife edge, which results in high range-Doppler coupling leading to a low range-Doppler resolution [1]. A dual-chirped signal has both an up-chirped signal and a down-chirped signal which results in better range-Doppler resolution. An LFMCW radar works on the frequency de-chirping principle where two beat frequencies are used to estimate the range and velocity of moving targets [2]. Most photonics-based radar systems, use optical bandpass filters in their photonic de-chirping mechanism which limits the system’s frequency agility and adds losses [3].

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