2050
User Guide
The error ellipse is centered on the least squares computed position and is defined
by the sigma max and sigma min. It bounds the 39.4% confidence region (ie; 1
sigma standard deviation – dual variate value).
The following diagram illustrates the Horizontal Error Ellipse values provided by the
C-Nav[2050] GPS Receiver in the NMEA GST message.
Note –
This 1 sigma value can be approximated to an area of probability in which 95% of the horizontal
position measurements will lie by multiplying by 2.447
.
References:
National Marine Electronics Association (NMEA 0183) Standard for Interfacing Marine Electronic Devices,
Version 2.1, October 15, 1995
UKOOA Guidelines For The Use of Differential GPS in Offshore Surveying, Appendix C, equation (1.25)
UKOOA Guidelines For The Use of Differential GPS in Offshore Surveying, Appendix C, equation (1.33)
UKOOA Guidelines For The Use of Differential GPS in Offshore Surveying, Appendix C, Section 5.
C-46
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