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Differential pseudo-random phase-modulated continuous-wave coherent LiDAR.

Yanan Zhi, Jinkai Wang, Yujiao Sun

|August 13, 2025

Summary

This summary is machine-generated.

This study introduces a novel LiDAR system for precise remote target ranging. It overcomes challenges in dynamic measurements, enabling accurate tracking of fast-moving objects.

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Last Updated: Sep 11, 2025

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Area of Science:

Optoelectronics
Remote Sensing
Metrology

Background:

Accurate ranging of dynamic remote targets is crucial for various applications.
Existing coherent LiDAR systems face challenges with Doppler frequency shift, coherence length, and phase noise.
Novel architectures are needed to overcome these limitations for high-precision measurements.

Purpose of the Study:

To present a differential pseudo-random phase-modulated continuous-wave (DPR-PMCW) coherent LiDAR system.
To achieve high-precision ranging of dynamic remote targets.
To address Doppler frequency shift interference, coherence length limitations, and random phase noise accumulation.

Main Methods:

Utilized a differential pseudo-random binary sequence (PRBS) for electro-optic phase modulation (EOPM).
Implemented a novel self-referenced interferometric receiver with a free-space unequal-arm-length Mach-Zehnder interferometer (UAL-MZI) and a 90° optical hybrid.
Employed a matched filtering algorithm for signal processing and achieved quadrature coherent detection with 1-bit delayed self-interference.

Main Results:

Achieved millimeter-level ranging precision after analog-to-digital conversion (ADC).
Demonstrated inherent immunity to wavefront distortion and effective suppression of random phase noise (RPN).
Showcased passive compensation for Doppler frequency shift (DFS) without active frequency tracking.

Conclusions:

The DPR-PMCW coherent LiDAR system successfully addresses critical challenges in dynamic target ranging.
Experimental validation confirmed real-time, high-precision metrology of long-range non-cooperative targets.
The system provides a viable approach for real-time high-precision ranging of rapidly moving targets.