Reach on laser imaging technology to terminal guidance

Xue-chun Tan; Guang-yong Jin; Zhi-chao Wu; Ming Ling; Zhu Liang

doi:10.1117/12.835353

28 August 2009 Reach on laser imaging technology to terminal guidance

Xue-chun Tan, Guang-yong Jin, Zhi-chao Wu, Ming Ling, Zhu Liang

Proceedings Volume 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging; 73821P (2009) https://doi.org/10.1117/12.835353
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China

Abstract

The development of range-imaging devices is motivated by various ground and space applications. Tasks in space missions include docking, rendezvous, manipulating robotic arms, landing and autonomous rover applications, sample identification and surface mapping. The ground applications include the guidance of vehicles, robotic and manipulator arms, and other autonomous or teleoperated machines, as well as surface or construction model generation. Without the scanner devices, scannerless imaging lidars have the characteristic of high frame rate, wide field of view and high reliability,which can be successful used in terminal guidance. Diode pumped laser radar with high repetition rate is studied in this paper. A bistatic system is set up and a high speed signal processor for the system is researched. In a conceptual sense, the imaging lidar has two parts, a transmitter and a receiver. Their field of views overlap throughout the measuring range.The imaging lidar operates as follows. Based on principle of pulsed time-of-flight (TOF) laser range finding, the solid-state laser diode-pumped laser produces short laser pulses, which though the expanded lens, then reach the target. The back reflected light is collected with a receiver lens and fed through optical fibres to discrete avalanche photo diodes (APDs). When a received pulse is detected by the comparator a time to digital converter (TDC) stops counting and a time interval, corresponding to the range, is produced. The precision of a single measurement is about ±4.0cm, but better precision is achieved by averaging. Information about the reflectivity of the target is gathered by recording the amplitude of the received pulse. Range images with the lidar prototype were taken indoors, the measuring distance was about 14m.

Citation Download Citation

Xue-chun Tan, Guang-yong Jin, Zhi-chao Wu, Ming Ling, and Zhu Liang "Reach on laser imaging technology to terminal guidance", Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 73821P (28 August 2009); https://doi.org/10.1117/12.835353

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KEYWORDS

LIDAR

Receivers

Transmitters

Pulsed laser operation

Imaging devices

Signal processing

Avalanche photodetectors

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