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Proceedings Paper

Research on key technologies of LADAR echo signal simulator
Author(s): Rui Xu; Rui Shi; Jiansen Ye; Xin Wang; Zhuo Li
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Paper Abstract

LADAR echo signal simulator is one of the most significant components of hardware-in-the-loop (HWIL) simulation systems for LADAR, which is designed to simulate the LADAR return signal in laboratory conditions. The device can provide the laser echo signal of target and background for imaging LADAR systems to test whether it is of good performance. Some key technologies are investigated in this paper. Firstly, the 3D model of typical target is built, and transformed to the data of the target echo signal based on ranging equation and targets reflection characteristics. Then, system model and time series model of LADAR echo signal simulator are established. Some influential factors which could induce fixed delay error and random delay error on the simulated return signals are analyzed. In the simulation system, the signal propagating delay of circuits and the response time of pulsed lasers are belong to fixed delay error. The counting error of digital delay generator, the jitter of system clock and the desynchronized between trigger signal and clock signal are a part of random delay error. Furthermore, these system insertion delays are analyzed quantitatively, and the noisy data are obtained. The target echo signals are got by superimposing of the noisy data and the pure target echo signal. In order to overcome these disadvantageous factors, a method of adjusting the timing diagram of the simulation system is proposed. Finally, the simulated echo signals are processed by using a detection algorithm to complete the 3D model reconstruction of object. The simulation results reveal that the range resolution can be better than 8 cm.

Paper Details

Date Published: 15 October 2015
PDF: 8 pages
Proc. SPIE 9671, AOPC 2015: Advances in Laser Technology and Applications, 96710G (15 October 2015); doi: 10.1117/12.2197990
Show Author Affiliations
Rui Xu, Beijing Institute of Technology (China)
Beijing Key Lab. for Precision Optoelectronic Measurement Instrument and Technology (China)
Rui Shi, Beijing Institute of Technology (China)
Beijing Key Lab. for Precision Optoelectronic Measurement Instrument and Technology (China)
Jiansen Ye, Beijing Institute of Technology (China)
Beijing Key Lab. for Precision Optoelectronic Measurement Instrument and Technology (China)
Xin Wang, Beijing Institute of Technology (China)
Beijing Key Lab. for Precision Optoelectronic Measurement Instrument and Technology (China)
Zhuo Li, Beijing Institute of Technology (China)
Beijing Key Lab. for Precision Optoelectronic Measurement Instrument and Technology (China)


Published in SPIE Proceedings Vol. 9671:
AOPC 2015: Advances in Laser Technology and Applications
Shibin Jiang; Lijun Wang; Chun Tang; Yong Cheng, Editor(s)

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