, System significance With the continuous progress of the work of police training and technology "and" digital Guard, day-to-day work of the police and a higher requirement, in accordance with the requirements of the digital Guard front-line police force needs to be more input into the street and community in the day-to-day patrol, thereby enhancing the mobility of the police, the flat conductor, and play to improve the current case detection rate and reduce the incidence of double effect. Hangzhou Collett Information Technology Co., Ltd. has developed a set of walkie-talkie-based police use digital patrol and smart positioning system for the above demand. The system via wireless transmission channel the GPS terminal attached to a walkie-talkie on the issue of geographical coordinates, time, speed data returns command center, electronic GIS map to show the location of the terminal and related information. No matter how the situation in the city, the command center can determine the location of the target with the fastest speed, the mobilization of police rushed to the scene, and thus more effective maintenance of law and order and combating crime. The system can also query, analysis and assessment of cases occur in the period of time, and on this basis to determine the best patrol routes and the day-to-day work of the police and patrol supervision. The system can support the company's production of all kinds of GPS terminal. Second, the system constitute the system by GPS terminal (embedded walkie-talkie shoulder microphone as standard accessories), wireless transmission channel and digital Guard and intelligent positioning service system three parts constitute each part functions as follows: 1. The GPS terminal: the high-sensitivity GPS module GPRS / CDMA module built-in walkie-talkie shoulder microphone to transmit the GPS data carriers (China Mobile, China Unicom, and telecommunications), GPRS / CDMA channel. The GPS terminal suitable for a variety of models, and do not need to replace the original transceiver can be realized the positioning function adequately protect the user's original investment. The fastest GPS data sending interval of up to 2 seconds. Wireless transmission channel: GPRS / CDMA channel transmit GPS data carriers (China Mobile, China Unicom, and telecommunications), low tariff. The system can also transmit GPS data via intercom channel to support the existing conventional or cluster system does not require any communication costs. Digital Guard and smart positioning service system: data receiving server, database server, application server, client software module to support the PGIS system, via Google Map corrective treatment, and Mapinfo electronic map. Walkie-talkie (with GPS terminal) timing to receive GPS data from the satellite positioning system and GPRS / the CDMA channel transmission to digital Guard and intelligent positioning service system, taking into account the public security and other law enforcement units of the confidentiality requirements, recommended server through VPN and operators providers GPRS / docking of the CDMA channel. The Digital Guard and intelligent positioning service system have improved the device and user management capabilities, combined with the GIS system to display real-time location information of all users and their current state, and the information is saved to the database for future queries. Any authorized user online real-time monitoring to the network within the police force distributed real-time operation, usually effective guidance and supervision of the day-to-day police officers patrol work, fast scheduling and science command in emergencies. Three main functions of the system need to be developed for police work, covering digital Guard judged cloth police facilities patrol, supervision, the main function is as follows: 1. Positioning and real-time trajectory functional systems based on GPS data regularly reported automatic positioning on the GIS map and a corresponding trajectory, the trajectory can be set in accordance with the mode of walking patrol, the moped patrol and vehicle patrol. 2. Scheduling click scheduling key and select the incident points on a GIS map system will search within a certain range patrol personnel, vehicles and Policing police force in order to achieve the nearest dispatch. Automatic tracking system can automatically follow a patrol personnel and vehicles to focus supervision. Take the initiative to report bit Guard press the PTT button on the intercom, automatic location information reported back to the system. 5. Historical track playback system can be played back on the previous patrol situation, selectable time range, the regional context as well as the playback speed, and similar video playback fast forward, slow forward, point-by-point play and other functions. 6. Patrol line set by the analysis of the high incidence of cases and hotspots set the patrol line week by the management system to publish guidance Guard patrol on time lines. 7 guard officers patrol personnel management settings and set the next stage based on the analysis of the effect of pre Guard patrol line. Guard inspection by comparing the default line and the actual trajectory, to determine whether the guard officers patrol in place, especially the point is time patrol will. The 9. Guard regional settings and handoff alarm set the corresponding patrol area, such as guard officers in patrol time prescribed leave the patrol area, automatic alarm system and record the event. 10 video surveillance and Map linkage display street camera video, synchronize query to get the picture of patrol time by the patrol track. 11. Administer the site system with the corresponding figures Guard administer the site, the site covers all aspects of patrol work, publishing and statistical functions for patrol officers recorded daily, leadership can be learned through advanced statistical functions and jurisdictions recent Guard circumstances. The user permissions alarm linkage, according to the area and jobs have different permissions. Functional demo of the system in a generic vehicle positioning system, except ordinary locate and track playback function, the system highlights the characteristics of public security operations, mainly in the following public security business functions: scheduling: by clicking on an incident point access to the surrounding area patrol officers, patrol vehicle and Policing police force, in order to achieve the online scheduling, scheduling area size can be set. Patrol zone settings and alarm: Set the patrol area, and this corresponds to guard officers beyond the default zone, the system automatically alarm. Guard the trajectory set: set patrol officers patrol line in a period of time and will to the point. Trajectory Contrast: Contrast default line and the deviation of the actual line