Fiber optical multi-channel laser radar with parallel processing

Christian Baetzel; Johannes K. Schaller; Christo G. Stojanoff

doi:10.1117/12.287764

25 September 1997 Fiber optical multi-channel laser radar with parallel processing

Christian Baetzel, Johannes K. Schaller, Christo G. Stojanoff

Proceedings Volume 3100, Sensors, Sensor Systems, and Sensor Data Processing; (1997) https://doi.org/10.1117/12.287764
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany

Abstract

This paper deals with frequency modulation radar ranging principles applied to an incoherent multi channel fiber optical laser radar (ladar) system. The amplitude of the power output of a semiconductor laser beam is linearly frequency modulated (chirp). The laser beam is guided into an optical fiber and then splitted in as many channels as needed. The light leaving the fibers illuminates the objects under surveillance. The backscattered light from the objects is coupled back into the fibers, guided to a single photo detector diode and converted to an electrical signal. Mixing this signal with a reference yields a new signal that includes explicitly the distance information in it's frequency components. The basic analysis techniques of this system are derived from estimation theory. Frequency as well as phase of the mixed signal are used to extract distance information. It is shown that the additional information in the phase of the signal lowers the variance of distance measurements.

Citation Download Citation

Christian Baetzel, Johannes K. Schaller, and Christo G. Stojanoff "Fiber optical multi-channel laser radar with parallel processing", Proc. SPIE 3100, Sensors, Sensor Systems, and Sensor Data Processing, (25 September 1997); https://doi.org/10.1117/12.287764

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