Title :
Systematic anomalies in experiment data from LIPS-III
Author :
Stevens, J.G. ; Conway, R.W. ; Stern, T.G. ; Conway, D.K. ; Hobbs, R.M.
Author_Institution :
US Naval Res. Lab., Washington, DC, USA
Abstract :
Anomalies of a possible system origin in the data from the LIPS-III spacecraft are discussed. Voltage data are examined, and then three puzzling current anomalies are discussed: an annual variation, high values in the third year of operation, and high initial values. Steep degradation in solar cell and solar concentrator ISC during the first 400 days in orbit is discussed. It is recommended that initially high values of ISC be ignored if this quantity drops rapidly soon after the first measurement. If data are kept only when the angle between Sun and satellite vectors is 60° or less, the problem with glint should be avoided. Concerning the annual variation of ISC, it is suggested that the data be averaged on an annual basis
Keywords :
artificial satellites; solar cells; LIPS-III spacecraft; current anomalies; solar cells; solar concentrators; Circuits; Current measurement; Degradation; Extraterrestrial measurements; Laboratories; Lips; Photovoltaic cells; Space vehicles; Temperature; Voltage;
Conference_Titel :
Photovoltaic Specialists Conference, 1990., Conference Record of the Twenty First IEEE
Conference_Location :
Kissimmee, FL
DOI :
10.1109/PVSC.1990.111807
