Click on the beginning letter on the word you are looking for:
ABC - DEF - GHI - JKL - MNO - PQR - STU - VW - XYZ
ABC
DEF
Ellipsoid height
This is the height of a point above an artificial ellipsoid.
GHI
Geoid undulation
That is the difference between ellipsoid height and mean sea level.
HP (High Performance)
OmniSTAR-HP makes use of GPS L1/L2 ionosphere corrected code and phase measurements. Using the phase measurements the relative distance to the satellite is measured at cm level. Fitting the relative orbits in combination with regional reference stations gives solutions. More
technical or
sales information.
GPS
Global Positioning System
JKL
Kick-Start: See Seeding
MNO
NMEA
The acronym stands for "National Marine Electronics Association" and is again an industry association that sets data transmission standards. In this case, the real name is NMEA 180. It is a set of standard messages defining the possible outputs of a GPS receiver. There are several "sentences" available; each of which has some unique data associated with them. They are all in ASCII format and are in the form of comma delimited strings. String lengths vary from 30 to 100 characters and are output at the interval chosen - again usually once per second. The most common string (or sentence) is called the "GGA" string. It contains the Time of the Fix, Latitude, Longitude, Height, Number of Satellites used in the fix, DOP, Differential Status, and the Age of the Correction (RTCM). Others have Speed, Track, Date, etc.
NMEA is available in virtually all GPS receivers and is the most commonly used data output format. It is also the format used in most software packages that interface to a GPS receiver.
PQR
RTCM
The correct name is RTCM-104, Version 2, 2.1, 2.3 or 3.0. The acronym stands for Radio Technical Committee, Marine and is the name of a committee that governs standards for passing data between different equipment used in the Marine Electronics Industry. In the early days of Differential GPS, they set up a standard format for sending differential correction data to a GPS receiver. The actual format is complex and lengthy, but it contains three main elements: (1) The time of the measurement at the Base Station, (2) measured range errors (Corrections) for every satellite in view at that Base Station, and (3) the "range error rate" for every satellite in view.
As explained above, the Range Rate term is currently set to a zero value. If SA were to be turned back ON, the rate term would be measured and sent in every message.
STU
Seeding (or Kick-Start)
If the reference position is known in the ITRF coordinate system. This position can be injected(Seed) into the HP calculations. This gives direct 10 cm level position accuracy.
VW
VBS
OmniSTAR-VBS uses GPS L1 distance measurements from a regional network.
Optimal range errors are calculated for the location of the customer and send to the GPS receiver.
VBS2
VBS2 makes use of a new more efficient data format. In future OmniSTAR will switch off the old VBS format. At that time all field receivers should have VBS2 capable software (see table). More info: click here.
XYZ
XP
OmniSTAR-XP makes use of precise GPS orbit and GPS clock measurements. No ground stations are needed for the XP solution. More info.