The Near-Earth Asteroid Rendezvous Laser Altimeter

Cole, Timothy D.; Boies, Mark T.; El-Dinary, Ashruf S.; Cheng, A. F.; Zuber, M. T.; Smith, David E.

doi:10.1007/978-94-011-5200-6_5

Cited by 18 publications

(20 citation statements)

References 4 publications

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“…Complete descriptions of NLR operational modes, data formats, and in-flight calibration results are given by Cheng et al (2000). Detailed descriptions of instrument characteristics, hardware design, and ground calibration results are given by Cole et al (1997).…”

Section: Introductionmentioning

confidence: 99%

Small-Scale Topography of 433 Eros from Laser Altimetry and Imaging

Cheng¹,

Barnouin²,

Prockter³

et al. 2002

Icarus

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Section: Introductionmentioning

confidence: 99%

Small-Scale Topography of 433 Eros from Laser Altimetry and Imaging

Cheng¹,

Barnouin²,

Prockter³

et al. 2002

Icarus

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“…Detailed descriptions of these instruments were given by Cole et al (1997) and Hawkins et al (1997), respectively. During a low-altitude flyover on 2000 October 26, which yielded observations at a minimum range of 6.4 km, NEAR found evidence of puzzling regolith processes (Veverka et al, 2001a), including the first images of smooth, flat deposits in the bottoms of craters which were referred to as "ponds".…”

Section: Introductionmentioning

confidence: 99%

Ponded deposits on asteroid 433 Eros

Cheng

Izenberg

Chapman

et al. 2002

Meteorit & Planetary Scien

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Abstract-In late January 2001 the NEAR-Shoemaker spacecraft performed low-altitude passes over the surface of 433 Eros. Coordinated observations ofthe asteroid surface were obtained at submeter resolution by the NEAR laser rangefinder and the multispectral imager. This paper presents three independent, coordinated observations of a 90 m pond adjacent to a granular debris flow, including the highest resolution altimetric measurements of ponded deposits on Eros. The ponded deposits appear to have been emplaced by fluid-like motion of dry asteroidal regolith. A simple model of seismic agitation from impacts is developed to account for pond formation on Eros. The model predicts that ponds should form readily on Eros but not on the Moon, where ponds are not observed. The model also suggests that the absence ofobservable ponds in the largest craters ofEros, as well as on Phobos and Deimos, may be related to regolith depth.

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“…This pulse dilation model is fitted to in-flight calibration data and yields predictions of NLR ranging performance at Eros. A full description of NLR instrument hardware, ground test, and prelaunch calibrations was given by Cole et al (1997). Some calibration results presented below supercede those given earlier.…”

Section: Introductionmentioning

confidence: 86%

“…The measured range was 601 counts. From the NLR oscillator speed of 480 MHz ± 0.0005% (correcting the drift specification given by Cole et al 1997), each count equals 2.0833 ns in time-of-flight. Hence the uncorrected one-way range was measured as 187.68 m, exceeding the true range by 4.80 m. The excess range converts to an excess of 32.0 ns in the measured time-of-flight caused by the combination of total system delay and the threshold-based delay (at a higher detector threshold, the count is registered at a later time, when the received signal exceeds the threshold; this "range walk" delay depends on the pulse shape).…”

Section: Laboratory Calibration Of Range Measurementmentioning

confidence: 99%