Gps Ephemeris
Can anyone plz give me the code/algorithm for conversion of satellite ephemeris into XYZ coordinates (for GPS)
I need to get the conversion code when the GPS receiver takes satellite ephemeris information from 3,4,5,6 satellites? Is there a separate code for each case?
The XYZ ccoordinates are then used to give the position information of the GPS receiver in the form of latitude, longitude, altitude…
The GPS receiver utilises information from the satellites which are visible to it and with the help of this info, the location of the receiver is calculated in the form of latitude, longitude, altitude etc… This info is not classified as civilian GPS receivers make use of the algorithm/code to obtain the location. Help me to find out the code when 3,4,5,6.. satellites are visible.
Most GPS devices that output data to a serial port, USB, or Bluetooth use a standard format known as NMEA. This standard is not classified.
There are many free utilities and source code for decoding NMEA data. You can check out some of them at:
http://nmea-decoder.safe-install.com/
If you want to write your own code for parsing this data, it’s not too difficult to do, but you’ll need a good guide to the various types of “NMEA Sentences” available and what each field means.
I’ve developed a library of code (for the company I work for) based on the guide found at:
http://www.gpsinformation.org/dale/nmea.htm
To answer your question about whether you would use separate code depending on how many satellites are in view, the answer is “No.”
The RMC sentence provides lat/lon, speed, heading, and altitude.
The GGA sentence provides lat/lon, number of satellites in view, and the Horizontal Dilution of Precision (HDOP).
I mostly use just these two sentence types for basic mapping applications, but there are several others that provide very useful information as well.
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