Realization of Multitone Continuous Wave Lidar

Torun, Rasul; Bayer, Mustafa Mert; Zaman, Imam Uz; Velazco, J.E.; Boyraz, Özdal

doi:10.1109/jphot.2019.2922690

Cited by 17 publications

(10 citation statements)

References 41 publications

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“…The presented LiDAR architecture is based on telecommunication setup and components; therefore, it could be applied as an FSO system for communication purposes. In order to avoid high peak power short time pulse emission presented in conventional ToF, the proposed work presents a modulation code to retrieve the range information in a similar manner implemented by [16], [17], and [19].…”

Section: Resultsmentioning

confidence: 99%

“…Most LiDARs applied to autonomous cars are based on the time-of-flight (ToF) principle, which might be categorized in indirect (i-ToF) or direct (d-ToF) according to the range calculation procedure [16]. The i-ToF technique uses the phase difference between periodic signals to determine targets distance [17]- [19] and d-ToF the round-trip time of a single, high peak power short pulse emission [16], [3].…”

Section: A Lidar Architecture Based On Indirect Tofmentioning

confidence: 99%

“…The LiDAR operation principle is similar to [17] with PN sequences and phase difference correlation for range measurement. In [19] Torun et al proposed a multi-tone continuous-wave LiDAR with multiple fixed RF tones for range and speed information retrieval. Finally, LiDARs photonic integration circuits (PIC) technology have been proposed for cost and size reduction to realize chip-scale systems.…”

Section: A Lidar Architecture Based On Indirect Tofmentioning

confidence: 99%

See 2 more Smart Citations

A LiDAR Architecture Based on Indirect ToF For Autonomous Cars

Silva

Sodré

2021

J. Microw. Optoelectron. Electromagn. Appl.

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A LiDAR architecture for autonomous cars is presented and validated by numerical and experimental results. The proposed scheme is based on indirect time-of-flight principle based on continuous-wave pseudorandom codes and incoherent detection for range evaluation. The range ambiguity and resolution are controlled by the parameters of the pseudorandom code. Experimental results are reported for target detection ranging from 13 to 1,000 m, as well as a demonstration of a dual-target detection, demonstrating the efficiency of the proposed LiDAR architecture to operate in real scenarios of autonomous cars. A measured range error of less than 0.6 % has been achieved for both single and dual-target detection.

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Section: Resultsmentioning

confidence: 99%

Section: A Lidar Architecture Based On Indirect Tofmentioning

confidence: 99%

Section: A Lidar Architecture Based On Indirect Tofmentioning

confidence: 99%

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A LiDAR Architecture Based on Indirect ToF For Autonomous Cars

Silva

Sodré

2021

J. Microw. Optoelectron. Electromagn. Appl.

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“…Previously, Multi-Tone Continuous Wave (MTCW) lidar relying on the phase and amplitude variations has been studied for single-shot ranging and velocimetry [22][23][24] . In those experiments, we have used amplitude variations due to constructive or destructive interferences at selected RF tones generated by free-running RF sources for ranging.…”

Section: Concept Of Phase-based Multi-tone Continuous Wave Lidarmentioning

confidence: 99%

Single-shot ranging and velocimetry far beyond the coherence length of CW lasers

Bayer

Guentchev

et al. 2021

Preprint

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The spectral linewidth of the continuous-wave (CW) lasers is one of the key limitations on the coherent lidar systems, which defines the maximum detection range. Furthermore, precise phase or frequency sweeping requirements is a deterrent in many applications. Here, we present the Phase-Based Multi-Tone Continuous Wave (PB-MTCW) lidar measurement technique that eliminates the necessity of using high coherence laser sources as well as any form of phase or frequency sweeping while employing coherent detection. In particular, we modulate a CW laser source with multiple radio-frequency (RF) tones to generate optical sidebands. Then we utilize the relative phase variations between the sidebands that are free from laser phase noises to calculate the target distance via post-processing and triangulation algorithms. We prove that the PB-MTCW technique is capable of performing single-shot ranging and velocimetry measurements at more than 500× the coherence length of a CW laser in a benchtop experimental demonstration.

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“…Under strong background light, a single-photon detector will output a large number of noise counts or even saturation. On the other hand, coherent detection can effectively suppress the influence of background light by interfering with the received signal with a local oscillator, making it one of the most sensitive optical detection techniques [ 10 , 11 ]. It is widely used in Doppler lidar, coherent laser communication and other fields [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Portable Pulsed Coherent Lidar for Noncooperation Targets at the Few-Photon Level

Pang

Zhang

et al. 2021

Sensors

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The decoherence in coherent lidar becomes serious with the increase in distance. A small laser spot can suppress the decoherence of the echo light from noncooperation targets. However, it is very difficult to keep a small light spot over a long distance. In this paper, a pulsed coherent lidar with high sensitivity at the few-photon level was demonstrated. A phase plate was used to modulate the wavefront of the laser to achieve 100 m focusing which reduced the decoherence effect. Based on coherent detection and time-of-flight (TOF) measurements, long-distance laser ranging and imaging on all days was realized. A signal classification and superposition method was used to extract the echo signal submerged in noise. The system was experimentally demonstrated by ranging different noncooperation targets within 105.0 m. The measurement rate was 10 k/s, and the measurement uncertainty was 1.48 cm. In addition, laser imaging was realized at ~50.0 m. The system was simple and portable as well as eye safe, and it may offer new application possibilities in automated vehicle lidar.

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Realization of Multitone Continuous Wave Lidar

Cited by 17 publications

References 41 publications

A LiDAR Architecture Based on Indirect ToF For Autonomous Cars

A LiDAR Architecture Based on Indirect ToF For Autonomous Cars

Single-shot ranging and velocimetry far beyond the coherence length of CW lasers

Portable Pulsed Coherent Lidar for Noncooperation Targets at the Few-Photon Level

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