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What is a GPS positioning system?

What is a GPS positioning system?

Answer:

Is where you squat, others can know that kind of equipment.
Positioning principle of GPS systemThe GPS system uses the high orbit ranging system, taking the distance between the observation station and the GPS satellite as the basic measurement. In order to get the distance measurements, mainly use two methods: one is the measurement of the GPS satellite signal arrival time spread ranging code user receiver, i.e.pseudorange measurement; one is the phase between the reference carrier signal carrier Doppler frequency shift GPS satellite carrier signal and receiver with differential measurement, namely carrier phase measurement. The pseudo range measurement is the fastest, while the carrier phase measurement is the highest. The three-dimensional position of the receiver can be calculated by measuring the distance of 4 or more than 4 satellites.#
GPS system compositionGPS system has three major components, namely, the space constellation, ground monitoring and user equipment. Space constellation in GPS 24 satellites distributed evenly in 6 orbital planes, orbital plane angle relative to the equatorial plane is 55 degrees, the angle between the plane of the orbit is 60 degrees, each satellite orbital plane 90 degrees, either on the satellite orbit plane than in the west adjacent corresponding satellite orbital plane the lead on 30 degrees. The average altitude of the satellite orbit is 20200km, and the satellite running period is 11 hours and 58 minutes. Each satellite every day about 5 hours above the horizon, and at the same time the number of satellites above the horizon varies with time and location are different, can be 4~11; the ground monitoring part of GPS at present mainly by the distribution in 5 ground stations around the world, including the injection station inspection station, master station and information. The space part and ground monitoring part of the GPS is the basis of the navigation and positioning of the system which is widely used by the user, which is controlled by the United States. The user equipment of the GPS is mainly composed of the receiver hardware and processing software. The user receives the GPS satellite signal through the user equipment, obtains the user position, the speed and so on through the signal processing, finally realizes uses GPS to carry on the navigation and the localization goal.
GPS system featuresThe advent of GPS marks the development of electronic navigation technology to a more glorious era. Compared with other navigation systems, the main characteristics of GPS system are as follows. Due to the large number of GPS satellites and reasonable distribution, it is possible to continuously observe at least 4 satellites in any place on the earth, so as to ensure the global, all-weather continuous real-time navigation and positioning needs. Multi function, high precision. GPS can provide high precision three-dimensional position, three-dimensional velocity and time information for all kinds of users. Real time positioning speed. At present, the positioning and speed measurement of GPS receiver can be completed in one second or less, which is especially important for high dynamic users. It has good anti-jamming performance and high security. Because the GPS system adopts the technology of PN code spread spectrum, the signal sent by GPS satellite has good anti-jamming and secrecy.

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