Patent ID: 6407701
Filing Date: 2002-06-18
Classification: G01C,G01S

Abstract:
A GPS receiver, comprising:a GPS measurement system which performs GPS measurement to obtain a GPS solution using a Kalman filter; and a computing system which calculates 2DRMS, which is an evaluation value for evaluating an error included in the GPS solution obtained by the GPS measurement, according to an equation: 2DRMS=2Ã—{square root over ((&sgr;Hâ€”Kalman+L )2+L +(HDOPÃ—&sgr;UERE+L )2+L )}wherein, &sgr;H_Kalman represents a horizontal component of an estimate error obtained from a diagonal in an error covariance matrix calculated in a mathematical process of the Kalman filter, HDOP represents a horizontal dilution of precision, and &sgr;UERE represents an user equivalent range error.