Program «MITRA» for modeling of characteristics of onboard laser ranging systems of space vehicles

Аuthors

Starovoitov E. I.^*, Savchuk D. V.^**

Radio Engineering Corporation “VEGA”, 34, Kutuzovskiy prospekt, Moscow, 121170, Russia

*e-mail: vega.su
**e-mail: post@rsce.ru

Abstract

In this paper, characteristics of onboard laser ranging system of space vehicles are investigated with using of mathematical modeling methods. The selected model is the classical equation model of laser ranging based on the geometrical optics approximation. The numerical method of spectral density is based on Planck’s law for black body.
The developed software called «MITRA» is designed to assess the feasibility of pulse laser ranging systems at work on space objects having a diffusely reflecting surface and equipped with corner reflectors. «MITRA» makes possible to evaluate compliance with the requirements of laser safety in the spectral range from 0.81 to 1.54 μm, to investigate the influence of the laser beam divergence at measurement distance on diffusely reflected signal, to measure the influence of back ground illumination on measurement distance on the diffusely reflected signal and corner reflectors. All the simulation is performed under an assumption that the power of background noise significantly exceeds the power of its own thermal noise of the photo detector.
It was obtained that the usage of corner reflectors enables measurements in the range from 20 to 55 km without laser pulses could exceed the limit defined laser safety standards. Use the so called safe wavelength 1.54 μm can increase the beamwidth of a laser, which in turn reduces the need for guidance and retention laser beam on the object. The simulation results show that the program «MITRA» can be recommended for wide use in early design prototyping.

Keywords:

laser ranging system, space vehicles, rendezvous and docking, modeling, program

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