Patent ID: 8218013
Filing Date: 2012-07-10
Classification: G01C

Abstract:
1. A star sensor comprising a detector array for viewing at least one star and outputting star data, a first median filter configured to reduce spikes in the outputted star data, and provide first filtered star data, an averaging filter configured to low-pass filter the first filtered star data and output second filtered star data, a second median filter configured to filter the second filtered star data in the cross-scan direction of the scan mirror, an adder configured to subtract (a) output data from the second median filter from (b) output data from the averaging filter to provide third filtered star data, and a calculator for determining a location of the at least one star in the detector array, based on the third filtered star data, wherein the first median filter includes a one row by three columns (1×3) median filter in the along-scan direction of the detector array, and the averaging filter includes a one row by at least 12 columns (1×12) averaging filter in the along-scan direction of the detector array.