Abstract
High-range resolution microwave radars are greatly important for automatic drive, security check, topographic mapping, etc. However, the generation and processing of broadband signals still challenge to state-of-the-art electronics. Besides, the broadband signal with a continuous spectrum is susceptible to interference from complex electromagnetic signals in the environment. Here, we present a microwave photonic radar with a sparse stepped-frequency chirp (SFC) signal, aiming to realize a high-range resolution detection with enhanced anti-jamming capability. With a recirculating frequency-shifting loop modulated by MHz radio frequency (RF) signal, a sparse SFC signal with a bandwidth of several GHz can be easily produced for radar target detection. In addition, microwave photonic de-chirping and compressive reconstruction are performed to achieve fast high-range resolution detection. Experimental results show that the proposed radar could provide a sub-centimeter level range resolution and a millimeter-level precision.
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