First: constant monitoring static
It is the oldest monitoring methods - generally known in the use of GPS, which is to occupy (or more) a point (or more) of the earth's constants, the coordinates for the other device to occupy the unknown point (to determine their coordinates) for a while Not less than 30 minutes of mutual monitoring simulatenous obervations. Thus, the base line base line is formed and the line is monitored (x teams, team y, z teams) between both points, and as long as the initial point is known, the coordinates of the second point of this base line can be calculated. The monitoring period or what is called a session shall be at least half an hour (joint monitoring at the same time) to reach a good accuracy in the al-Qaida baseline and then calculate the x-Ray Coordinates. In High-Precision Work (networks), it would be preferable to increase the session to an hour and sometimes two hours, since the basic rule is: the more time the monitoring time increases, the greater the accuracy of the calculations
Monitoring of networks networks
Almost the same constant monitoring method but with a number (and not only 2) of devices occupy a set of points at the same time. There are often two points (of the points) with the coordinates, while the rest of the organs occupy unknown points. Here, the monitoring time is more than an hour, but it depends on the lengths of the lines of this network, so that it can be reached.
Thirdly monitoring monitoring
In this way, the device continues to move throughout the monitoring. Example: GPS device installed in a plane or steamer... etc. Therefore, this method is not used in navigational engineering because its accuracy = accuracy of navigation or hand-held devices, i.e. on average 4-8 metres.
Semi-Mobile monitoring or pseudo-Mobile Monitoring Semi-kinematic or pesudo-kinematic
It's a group that includes a set of GPS monitoring methods and not one way, but its basic idea is that there is a GPS device that is consistent static at the point of tip of the coordinates while there is another device (or a set of devices) that moves to monitor a point - or The principle on which these methods depend is: as long as the fixed device occupies a tip point, the coordinates are calculated as the GPS meteorologist and compare them to the values of the known coordinates of this point, and hence the value of the error in the meteorologist of each moon. GPS satellites at every moment of monitoring time (by), and of course the value of this error will be the same in the same satellite meteorology at the same moment of monitoring at the other mobile device Rover GPS, so if we can Add the value of this error (calculated at the fixed point) to GPS meteorologist at the unknown point. We can increase the accuracy of the unknown point and reach accuracy at the even level.
How this calculation works, there are a number of ways, but most of them are two ways:
Mobile monitoring method of post office-processing kinematic and sometimes called short
The entire field works - both for the fixed or mobile device, and then all the weather are uploaded after returning to the office at the end of the day, and the software program is and calculating the unknown points of origin based on the point coordinates - or points. The Information.
Instant Mobile Monitoring Method Real time or short
It differs from the previous way in the presence of two radio radios, both of the firm and the mobile device, so that the fixed device will calculate the error in GPS meteorologist at every moment of the monitoring period and send these corrections via radio radio. - to the mobile device, which in turn is correcting a test and calculating the x-point coordinates - very accurately - at the same moment. Thus, it does not require the office account process, but it is all on the site.
Certainly, each of the past ways has its characteristics, flaws and uses.