When talking about the Sat – Nav, the first thing which comes to mind for most people is the navigation system of a boat. Truth is, this navigation system is what is usually in their vehicle, simply put, it is the device which actually receives and then translates your actual position.
An overview of exactly how GPS works
First off, GPS simply refers to global positioning system. It functions in the sense that at any given pit or time, there are at least 24 satellites orbiting the earth. In addition to this, it is equally worth noting that any given place on earth will be getting signals from at least 4 satellites. Just so you know, GPS was developed by the military so as to allow troops to navigate much more accurately when in the field. However, things have changed since the 1990’s as the technology became open to anyone using or who has a GPS receiver.
The position of satellites is always known and can easily be tracked from earth. Satellites high above are known to orbit the earth at least twice every 24 hours. These satellites are also always meshed up with each other hence able to give out the exact locations of anything back on earth including the time which the transmission was sent out.
The satellites due to their exact orbits should all be varying from all angles to the GPS device. This is what forms the basis of the operation of the Sat-Nav system or better yet any other handheld unit which you may be using. It is because of this variation in distance why location might once in a while different and that signals might once fail to arrive at the exact instant they are required.
Taking into consideration the above, it is important to understand the fact that when signals get to the GPS device you are most likely to hear discrete signals since following each millisecond of delay that there is, each signal is then able to compute the position of each satellite or better yet triangulation. It is from the analysis of this data that pointing out the exact position of an item on earth can be done.
An overview of the limitations inked to the use of GPS
It is important to understand the fact that for GPS receivers to work they must first off get a minimum of 4 or if possible more satellites in order to be able to make sure that a coordinate can easily be pin pointed/calculated. Another thing is, an unhindered view of the sky is also crucial to global positioning as it will limit the likelihood of having signals obstructed. It has previously been noted that the weather can sometimes reduce the quality of signals being sent out.
as far as accuracy is concerned, Sat-Nav have been found to extremely accurate, in fact, most units are accurate don to a few metes meaning making sense of the data provided will be very easy.