A Smart Work Performance Measurement System for Police Officers
A Smart Work Performance Measurement System for Police Officers Global Positioning System (GPS) was developed by theUnited States in the 1960s, and it was put into use in 1994 [1].It uses 24 satellites distributed in 6 orbits. Once a receiverreceives signals from more than 3 satellites, the specific posi-tion can be identified [2]. Up till now, GPS is the most suc-cessful satellite positioning system in the world. In practice,many applications and experiments use GPS, and it plays akey role [3]–[5]. The entire world benefits from this advancedand powerful product in both military affairs and dailylife. Gradually, more and more products have been devel-oped based on the utility of GPS, for instance, navigationsystems that use GPS technology to guide travelers and bustracking systems that use GPS technology to track specificbus locations. Two popular and widely used applications,Google Map [6] and Yelp [7], adopt GPS as well. Moreover,almost all cell phones current...