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There are many hindering factors in GPS's optimal results. The first one is "number of satellites requiring at least four common satellites, at both the reference receiver and recover for either DGPS or RTX solutions. Also, remember to have an extra fifth satellite for on-the - fly RTK initialization, which check on the internal calculation. More addition of satellites give even more checks, which is always useful.
The second one is Multipath which is just reflection of signals like the phenomenon of hosting on television screen.
The third is Ionosphere, which changes the speed of the signal before being reached to antenna on the earth. It is also called "Charged particles". If your rover receivers and reference are comparably close together, the effects of ionosphere inclines to be minimal.
The fourth is Troposphere mainly the weather zone of our atmosphere; the droplets of water vapor in this zone can effect the speed of the signals. The vertical component of your GPS answer is mainly particularly sensitive to the troposphere.
The fifth is Satellite Geometry or the distribution of satellites in the sky, also called Position Dilution of Precision (PDOP), and expressed as a number, where lower numbers are likeable to higher number, effects the computation of position. The best results are obtained when PDOP is less than about 7.
The sixth is Satellite Health. When the satellite system is healthy and reliable, it is likely for the satellites to occasionally be unsound and unhealthy. Health status is broadcast while using information from the U.S.Department of Defense. And the strength of the satellite relies on hindrance and the elevation of the satellites above the horizon. They must be avoided to full extent. Also, mind for satellites, which are close to the horizon, since the signals are weaker.
If there exists an interruption in the radio link amid a reference receiver and a roverer, then your rover is left with an autonomous position. Therefore, it is essential to set up a network of radios and repeaters, by which the uninterrupted radio link, needed for the best GPS results can be provided.
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