Pet GPS tracking systems are designed to monitor the location of pet dogs or cats. The application is very popular. The global positioning system, or GPS, is a owned by the USA government. It is used by military and civilian users all over the world, at no cost to users. The system has three components – satellites orbiting earth, control bases in countries around the globe and, lastly, millions of users with GPS receivers.
The GPS is owned by the US government and operated by its Air Force. It provides positioning, navigation and timing services to military and civilian users free of charge. The system consists of three components – satellites orbiting earth, control bases in various countries and, finally, millions of individual GPS receivers.
Each GPS satellite transmits radio microwaves one-way down to earth. These radio signals contain a set of data capable of being received by GPS pet trackers. That data includes the precise time at which the data was transmitted plus the position of the satellite described in three dimensions, namely, its vertical height and its latitude and longitude coordinates. Using signals received from three or more satellites, a GPS receiver can triangulate its location to great precision. The system allows civilians to calculate their location to within tens of meters of true position.
Each GPS satellite transmits one-way radio microwaves These radio signals transmit a set of vital data capable of being received by GPS pet trackers. That data includes the precise time at which the data was transmitted plus the position of the satellite described in three dimensions, namely, its vertical height and its latitude and longitude coordinates.
The signals received by a GPS receiver allow it to calculate its own latitude, longitude and altitude. That estimate is based solely on the amount of time, measured in nanoseconds, it took for the radio signals to travel from the satellites to the device. For this reason, the measurement of time is critical to the system.
The tracking unit on the collar has an antenna to receive a signal from the base station. The signal is set at a distance to define a cyber fence at a set circumference, say 100 to 300 feet, around the home base station. If a base station stops getting signals from the pet collar, it concludes the pet has moved outside the fence and the tracking system goes into lost mode.
GPS control stations are located around the world. They maintain the satellites in their predetermined orbits through occasional re-positioning adjustments. Importantly, the control stations also maintain the operation of the atomic clocks aboard each satellite.
At that point, the light on the collar unit is activated and the unit begins to operate as a GPS receiver and the location of the pet displays as a dot on a map displayed on the home base station.
The configuration of the pet GPS system outlined above involves mobile phone charges since the GSM modem must link to a commercial mobile phone operator. Alternative pet tracking system configurations are available that do not involve a GSM modem and hence mobile phone charges. Those alternatives are essentially modifications of the basic configuration outlined above.