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Global positioning systems, widely known as GPSs, provide timing, navigation, and positioning signals to military and civilian users. When a GPS receiver receives satellite signals, the distance between the satellite and the user is first calculated, and then the user's current position is located using the triangulation method. However, there is a possibility that atmospheric conditions, multipath fading, and shadowing effects could have an impact on the satellite signal. As wireless technology has progressed, different user locations and locating systems have been invented, such as the Wi-Fi locating system, which mainly uses Received Signal Strength Indication (RSSI) to set up radio maps that provide locations, and RF models to estimate the locations of a moving user.
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