| 1D |
one dimensional |
| 2D |
two dimensional |
| 2drms |
two times distance root mean square |
| 3D |
three-dimensional |
| ACP |
Active Control Point |
| ACS |
Active Control System |
| AS |
anti-spoofing |
| Az |
azimuth |
| c |
speed of light in a vacuum |
| CACS |
Canadian Active Control System |
| CCM |
Canada Centre for Mapping |
| CDU |
control and display unit |
| CEP |
circular error probable |
| CGVD28 |
Canadian Geodetic Vertical Datum 1928 |
| DoD |
United States Department of Defense |
| DOP |
dilution of precision |
| DoT |
United States Department of Transportation |
| EDM |
electronic distance measurement |
| Elev. |
elevation angle |
| f |
frequency |
| Φ |
measured carrier phase |
| GDOP |
geometrical dilution of precision |
| GIS |
geographical information system |
| GPS |
Global Positioning System |
| GPSIC |
Global Positioning System Information Center |
| GSD |
Geodetic Survey Division |
| GSD95 |
Geodetic Survey Division 1995 geoid model |
| h |
ellipsoidal height |
| H |
orthometric height |
| HDOP |
horizontal dilution of precision |
| Hz |
hertz (cycles per second) - unit of measure for frequency |
| IERS |
International Earth Rotation Service |
| ITRF |
IERS Terrestrial Reference Frame |
| λ |
wavelength |
| MHz |
zone million hertz (see Hz) |
| MSE |
mean square error |
| MTM |
Modified Transverse Mercator |
| N |
ambiguity, or |
| N |
geoid undulation |
| NAD27 |
North American Datum 1927 |
| NAD83 |
North American Datum 1983 |
| NGDB |
National Geodetic Database (maintained by GSD) |
| NGS |
U.S. National Geodetic Survey |
| NRCan |
Natural Resources Canada |
| NTS |
National Topographic System |
| P |
code measurement |
| PDOP |
positional dilution of precision |
| ppm |
parts per million |
| ρ |
range |
| rcvr |
receiver |
| RF |
radio frequency |
| RINEX |
receiver independent exchange format |
| rms |
root mean square |
| σ |
standard deviation |
| SA |
selective availability |
| SEP |
spherical error probable |
| SMRSS |
Surveys, Mapping and Remote Sensing Sector |
| tr |
reception time |
| tt |
transmission time |
| UERE |
user equivalent range error |
| UTM |
Universal Transverse Mercator |
| VDOP |
vertical dilution of precision |
| WGS84 |
World Geodetic System 1984 |
| xr,yr,zr |
receiver coordinates |
| xs,ys,zs |
satellite coordinates |
