From Yoaz Tue Mar 17 11:11:41 1998 From: Yoaz (Yoaz) Date: Tue, 17 Mar 1998 11:11:41 PST Subject: [IGSMAIL-1833] A new model for GPS BlockIIR solar radiation pressure Message-ID: ****************************************************************************** IGS Electronic Mail Tue Mar 17 11:11:41 PST 1998 Message Number 1833 ****************************************************************************** Author: Yoaz Bar-Sever Subject: A new model for GPS BlockIIR solar radiation pressure Dear Colleagues, I was recently able to test a new solar radiation pressure model for GPS Block IIR satellites. This model was designed by the manufecturer of the spacecraft, Lockheed-Martin, and is in the form of a table. Its main advantage over the T30 model is in the modeling of the solar pressure during the fixed yaw regime and in modeling Y axis forces. My tests of this model focused on identifying any major inconsistencies or problems with this model. Failing to find these, I can recommend this model for more thorough testing. The model is free for anyone's use but with out any liability implied. I placed the table on our ftp server "sideshow", directory "pub/GPS_yaw_attitude" in the file BlockIIR_srp_table. Explanations are included in the file. For more information about GPS Block IIR solar pressure and attitude models consult IGS mail #1653 from July 30, 1997. Sincerely, Yoaz Bar-Sever -- Dr. Yoaz E. Bar-Sever yeb at cobra.jpl.nasa.gov MS 238-600 voice: (818) 354-2665 office Jet Propulsion Laboratory (626) 794-9243 home 4800 Oak Grove Dr. FAX: (818) 393-4965 Pasadena, California 91109 [Mailed From: yeb at cobra.jpl.nasa.gov]