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Proceedings Paper

Control software for the Near Earth Asteroid Rendezvous laser rangefinder
Author(s): Ashruf S. El-Dinary; Timothy D. Cole; R. Alan Reiter; Daniel E. Rodriguez
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Paper Abstract

The near earth asteroid rendezvous (NEAR) laser rangefinder (NLR), an instrument on the NEAR spacecraft, was designed to measure range from the NEAR spacecraft to the surface of the asteroid 433 EROS. The instrument consists of a laser transmitter, a calibration fiber, an optical receiver, analog electronics, power converting and conditioning electronics, and a digital processing unit. The digital processing unit controls configuration and operation of the transmitter and analog electronics. Software running in the processor handles communication between the spacecraft data bus and the NLR. The software includes functions for command handling, telemetry data formatting and data transfer to the command and data handling computer, transmitter control, measurement of the receiver noise floor, and correction of some timing delays. A brief overview of the software is given along with descriptions of auto-calibration sequences and test results.

Paper Details

Date Published: 18 October 1996
PDF: 10 pages
Proc. SPIE 2811, Photonics for Space Environments IV, (18 October 1996); doi: 10.1117/12.254037
Show Author Affiliations
Ashruf S. El-Dinary, Johns Hopkins Univ. (United States)
Timothy D. Cole, Johns Hopkins Univ. (United States)
R. Alan Reiter, Johns Hopkins Univ. (United States)
Daniel E. Rodriguez, Johns Hopkins Univ. (United States)


Published in SPIE Proceedings Vol. 2811:
Photonics for Space Environments IV
Edward W. Taylor, Editor(s)

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