An approach for targeting landers and penetrators using orbital optical navigationOnboard orbital optical navigation data is analyzed with the purpose of generating topographic maps for selecting a landing site. It is suggested that a near-real time orbit-determination process be used for solving a large set of parameters including the spacecraft orbit and primary-body gravity field, the rotational properties of the planetary body, the coordinates of surface features, and the camera-pointing and orientation angles of each picture. A batch-sequential formulation of the standard least-squares problem is employed, along with backward smoothing and a square-root formation filter. An experiment in which over 100 images of Phobos are processed to estimate about 2000 parameters is presented, with emphasis on coordinate systems, transforming points on the reference surface to images in the picture, parameter estimation, and cartographic accuracy.
Document ID
19900059734
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wang, Tseng-Chan (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Duxbury, Thomas C. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Synnott, Stephen P. (JPL Pasadena, CA, United States)
Edwards, Kathleen (USGS Flagstaff, AZ, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking