Opt Lett. 2018 Dec 1;43(23):5869-5872. doi: 10.1364/OL.43.005869.
The signal-to-noise ratio (SNR) of the photonic time-stretching receiver in the photonic time-stretch coherent radar (PTS-CR) system is theoretically analyzed. According to the analysis based on the erbium-doped fiber amplifier (EDFA) characteristic, it is found that the SNR is dominantly determined by the input optical power of the EDFA. With the improvement of the SNR of the photonic time-stretching receiver, the radar detection sensitivity is consequently enhanced. Furthermore, a PTS-CR system operating at W band with the ultrabroad bandwidth of 12 GHz is experimentally enabled, leading to the range resolution of ∼1.48 cm in dual-target detection.
对光子时间拉伸相干雷达（PTS-CR）系统中的光时分拉伸接收机的信噪比（SNR）进行了理论分析。根据基于掺铒光纤放大器（EDFA）特性的分析，发现 SNR 主要由 EDFA 的输入光功率决定。随着光时分拉伸接收机 SNR 的提高，雷达检测灵敏度也随之提高。此外，还实现了工作在 W 波段、带宽为 12GHz 的超宽带 PTS-CR 系统，在双目标探测中实现了约 1.48 cm 的距离分辨率。
