CPC G01S 7/4815 (2013.01) [G01S 7/4817 (2013.01)] | 18 Claims |
1. A frequency modulated continuous-wave (FMCW) light detection and ranging (LiDAR) system, comprising:
an optical source to emit an optical beam;
an optical window to reflect a first portion of the optical beam to generate a local oscillator (LO) signal;
an optical scanner to transmit a second portion of the optical beam to a target to scan the target to generate a target return signal;
a birefringent crystal plate to transmit the LO signal and the target return signal to a photodetector (PD) and shift the LO signal and the target return signal by different displacements to increase a percentage of an overlap of the LO signal and the target return signal on a detection plane of the PD, wherein an optical axis of the birefringent crystal plate is disposed to create a first angle with respect to a front surface of the birefringent crystal plate on a cross-section, and wherein the first angle is determined based on a scan speed of the optical scanner; and
the PD to mix the target return signal with the LO signal on the detection plane of the PD to extract range and velocity information of the target.
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