Aug 9, 2017 · Each satellite is sending exact (atomic) time, and GPS receiver calculates thanks to it, it's position. There is also some additional data, like position of satellite (almanac) which is also required to perform calculations, and a few minor things.

Among the 4 required dimensional mesaurements (x,y,z,time), time always needs to be resolved BECAUSE satellite signals (electromagnetic waves) travel at the speed of light and reach receiver in ~0.07 atomic seconds; and thus, a slight inaccuracy in the GPS receiver's relatively cheap internal clock would give a "very wrong" locational fix ...

Aug 9, 2017 · NAVCOM GPS Satellite Predictor Tool. Great tool if you require a certain level of (x)DOP for GPS Data Collection, to prevent spending an entire day in the field due to poor (x)DOP of GPS Satellites. Of course this tool can not calculate other external factors which will …

Jun 15, 2018 · Thanks. The lat/long/distance are what was received by the GPS from the satellite. They are not the lat/long position of the GPS but of the satellite location at the time the message was sent. Seems I can't ask a "tutorial" type question here so …

Dec 17, 2020 · In comparison, if I take my 9-year-old Trimble Geo 6000 XT, it only tracks GPS (GPS + GLONASS is an extra-cost option), so typically it tracks 8 to 10 GPS satellites at any time, and the accuracy estimate never drops below 5M unless I use real time corrections.

can anyone source an explicit formula for calculating the elevation angle for a GPS satellite as seen from a receiver. I can't seem to find one. Even a text reference would be great. I couldn't quite find anything posted already that does the same thing.

Dec 5, 2016 · Calculating the receiver position from satellite elevation and azimuth angles is relatively "simple" geometry and is entirely unrelated to what the GNSS receiver does with pseudoranges etc. The Azimuth and elevation for satellites are calculated by the GNSS receiver based on the satellite positions and the receiver position.

Mar 10, 2023 · Calculating ECEF position of gps satellite? Ask Question Asked 1 year, 11 months ago.

Apr 6, 2015 · Google.com Maps satellite imagery uses the WGS-84 coordinates, which causes a pretty terrible mismatch: I'm still unclear as to whether GPS chips manufactured in China return GCJ-02 coordinates directly, or if they return WGS-84 coordinates, which approved map software can convert to GCJ-02.

Dec 12, 2014 · The Global Positioning System (GPS) is a free service that is owned and operated by the U.S. Government and is always available. When we buy a GPS device, we don't pay a monthly fee or pay a tax for GPS support. We only pay the price of the device. I don't understand how it's possible. How does the U.S. make money?