Implementation of a pulse-type laser detection and ranging system based on heterodyne detection for long-range measurement with high repetition rate

Song, Hajun; Lee, Chang Jae; Koh, Hae Seog; Jo, Min Sik; Choi, Young Soo; Kwon, Yong Joon

doi:10.1063/1.5113909

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…Coherent optical detection is done using a 2x2 coupler and Balanced Detector and as a result, Doppler shift is measured for velocity estimation. 3 The sensor configuration with fiber optic components for three-channel laser transmitters and coherent interferometric setup are assembled and integrated on mechanical modules as shown in the CAD drawings in Figures 2(a), 2(b), and 2(c). The modules are designed for optimizing fiber routing in all stages of lasers of fiber bending diameter of more than 30cm to avoid any stress induced during the routing of the fiber.…”

Section: High Power Fiber Laser In Mopa Configuration Using All Fiber...mentioning

confidence: 99%

Three-channel space-qualified high power pulsed fiber laser system for accurate velocity detection in bistatic configuration

Malik,

Rajan,

Umesh

et al. 2023

Optical Measurement Systems for Industrial Inspection XIII

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We report the development of space qualified three-channel bistatic Laser Detection and Ranging (LADAR) system capable of working up to 2.2 km which includes Master oscillator power amplifier (MOPA) based on High Power Fiber Lasers with specifications of 5W Peak power, 4-millisecond pulse-width at 1550 nm central wavelength. Transmitter-Receiver collimators are aligned in Bistatic configuration within 3.6 arc second accuracy. Doppler shift measurement is estimated using all-fiber optical heterodyne interferometry and thereby highly accurate velocity detection is achieved with 3 sigma accuracy of ±3.108, ±4.063, and ±3.3903 mm/s. The developed LADAR sensor system for velocity measurement is space qualified and has shown nominal performance during all phases of thermal and vibration tests.

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Section: High Power Fiber Laser In Mopa Configuration Using All Fiber...mentioning

confidence: 99%

Three-channel space-qualified high power pulsed fiber laser system for accurate velocity detection in bistatic configuration

Malik,

Rajan,

Umesh

et al. 2023

Optical Measurement Systems for Industrial Inspection XIII

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“…It is widely used in Doppler lidar, coherent laser communication and other fields [12][13][14][15][16][17][18][19][20][21]. Pulsed coherent lidar has reduced the range ambiguity for long-distance ranges [22][23][24]. Coherent light becomes partially or completely incoherent, due to the random phase change of the wavefront, which is called decoherence.…”

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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A field-programmable-gate-array based high time resolution arbitrary timing generator with a time folding method utilizing multiple carry-chains

Wang

Tong

Qin

et al. 2021

Review of Scientific Instruments

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A carry-chain based high time resolution arbitrary timing generator, which is fully implemented using field-programmable-gate-array resources, is reported in this paper. The arbitrary timing generator channel operates with two alternative carry-chains to achieve non-dead-time timing sequence generation, and a 45.3 ps time resolution with a 383 ps minimum pulse width can be obtained. The time resolution is further improved to 11.3 ps by employing four parallel carry-chains in a single arbitrary timing generator channel to realize “time folding.” The timing generator has a high time stability, and the time uncertainty is below 12 ps within a wide time range of 1 ns–108 ns. The arbitrary timing generator can be used to generate continuous spike timing sequences with a picosecond time resolution.

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Implementation of a pulse-type laser detection and ranging system based on heterodyne detection for long-range measurement with high repetition rate

Cited by 3 publications

References 17 publications

Three-channel space-qualified high power pulsed fiber laser system for accurate velocity detection in bistatic configuration

Three-channel space-qualified high power pulsed fiber laser system for accurate velocity detection in bistatic configuration

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

A field-programmable-gate-array based high time resolution arbitrary timing generator with a time folding method utilizing multiple carry-chains

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