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How Does GPS Work?
Xiamen Juiyi Tech Co.Ltd | Updated: Jun 26, 2018

How does GPS work?

 

The basic principle of GPS positioning is to determine the position of the point to be measured by using the method of spatial distance resection, based on the satellite's instantaneous position of high-speed motion as known starting data. According to the positioning method, GPS positioning is divided into single point positioning and relative positioning. Single point positioning is based on a receiver's observation data to determine the location of the receiver, it can only use the pseudo-range view measurement, can be used for the general navigation and positioning of vehicles and ships. Relative positioning is a method of determining the relative position between observation points based on the observation data of two or more receivers. It can use both pseudo-range and phase-view measurements. Geodetic or engineering measurements should use phase observations. Relative positioning.

 

GPS observations include satellite and receiver clock errors, atmospheric propagation delays, multipath effects, and other errors. They also suffer from satellite broadcast ephemeris errors in positioning calculations. Most of the common errors are caused by relative positioning. Offset or weakened, so the positioning accuracy will be greatly improved, dual-frequency receiver can be based on the observation of the two frequencies to offset the main part of the ionospheric error in the atmosphere, in the high precision requirements, the distance between the receiver is far, you should use dual-frequency Receiver.

 

Best In Car Camera Dash Cam Dual Update Icloud Support With GPS For Car.jpgAfter the GPS receiver decodes the received satellite signal or uses other techniques to remove the information modulated on the carrier, the carrier can be recovered. Strictly speaking, the carrier phase should be referred to as the carrier beat phase, which is the difference between the received carrier phase of the satellite signal affected by the Doppler shift and the phase of the signal generated by the local oscillator of the receiver. Generally measured at the epoch of the receiver clock to determine, keep track of the satellite signal, you can record the value of the phase change, but the initial phase of the receiver and the satellite oscillator when the observation is not known, The phase integer of the initial epoch is also unknown, ie, the integer ambiguity can only be solved as a parameter in data processing. The precision of the phase observations is as high as millimeters, but the precondition is that the integer ambiguities are solved. Therefore, the phase observations can only be used when there is relative positioning and there is a continuous observation value, and the positioning accuracy better than the meter level is only achieved. Phase observations can be used.



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