Mobile phone GPS is what people generally think about whenever checking out locating smartphones. GPS (Global Positioning System) utilizing satellites is the most widely recognized and more precise means of tracking. However, GPS needs satellites to be in direct line of site from the cell phone. It doesn’t work as well indoors or in dense cities. If the cellphone is inside a structure, for instance your school, mall, or often riding in a car the signals might not get to the cell phone. At times thick cloud cover and dense foliage interferes with reception. Some smartphones may retain the last known GPS location, others might not.
Much of the discussion dealing with cell tracking, mobile GPS and cell phone tracking software could be helped by a GPS Satellite primer.
GPS satellites broadcast signals from space that GPS receivers use to determine three-dimensional location (latitude, longitude, and altitude) plus precise time. GPS stands for Global Positioning System and is a system that is made up of 3 main segments: Space Segment, Control Segment and User Segment.
The GPS Space Segment incorporates twenty-four to thirty-two satellites that orbit the earth in medium earth orbit MEO. These satellites are also known as as the GPS Constellation, and they make an orbit twice a day. They are not geosynchronous, but rather move at over 7,000 mph. They are solar powered but have battery backup for when they are on the dark side of the earth. They are placed so that there are at least 4 satellites ?visible? from any point on earth. Small rocket boosters on each satellite keep them properly positioned. The satellites have a lifetime of about 10 years until all their fuel is exhausted.
GPS Satellites are not communications satellites. Geostationary or communications satellites use a higher altitude 22,300 miles above the equator. These satellites are used for weather forecasting, satellite TV, satellite radio and most other types of global communications. At exactly 22,000 miles above the equator, the earth’s gravitational force and centrifugal forces are offset and are in balance. This is the ideal location to position a communications satellite. The earth rotates at about 1,000 miles an hour, and because of their high earth orbit the earth-synchronous satellites need to move at about 7,000 mph to sustain position. This is just about the same speed as GPS satellites, but since earth-synchronous satellites are 10,000 miles further away they stay in place relative to the earth.
The GPS Control Segment incorporates Master Control Station, an Alternate Master Control Station, and a host of dedicated and shared Ground Antennas and Monitor Stations that work together to make sure the satellites are working correctly and the data they send to earth is accurate.
The GPS User Segment is composed of of GPS receivers taking the shape of cell phones and , laptops, in-car navigation devices and hand-held tracking units along with the people that use them, and the software programs that make them function.
GPS receivers determine position by precisely timing the signals sent by GPS satellites. This information includes the time the message was transmitted, precise orbital information (the ephemeris), and the general system health and rough orbits of all GPS satellites (the almanac).
In the event that satellite signals are not accessible, or accuracy and precision is less important than battery life, making use of Cell-ID is a useful substitute to GPS cell phone location. The position of the device might be computed by the cellular network cell id, that recognizes the cell tower the mobile phone is using. By knowing the position of this tower, you may know roughly the location where the handset might be. Nonetheless, a tower can cover a large area, from a few hundred meters, in higher populationdensity regions, to several kilometers in lower density zones. This is why location CellID accuracy is lower than GPS accuracy. Having said that location from CellID still provides quite a good alternative.
A Quick Intro To Mobile Phone GPS Tracking
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