The most common GPS receivers have the following two
09.19.2010
| e recording, select the waypoint can be automatically generated route. Built-in antenna makes the model compact, it is the most widely used GPS equipment; air-to-use airspace map provides global and regional maps, high sensitivity, suitable for high-speed road to locate the aircraft; sea-to-use built-in global charts , large screen, offers can be fixed to the hull of the supporting bracket and the antenna. If you want to buy a GPS receiver, the following knowledge is necessary. GPS receiver can use, operating principle, the receiving frequency of the different categories: 1, according to the receiver use classification 1) The navigation type receiver This type of receiver is mainly used for moving vehicle navigation, it can give real-time vehicle location and speed. Such receivers generally use the C / A code pseudorange measurement, real-time positioning accuracy of single point lower, typically +-25MM, have implications for the SA +-100MM. Such receivers are cheap, widely used. According to different application areas, such receivers can be further divided into: Vehicle type - for vehicle navigation and positioning; Marine type - for ship navigation and positioning; Air-type - used in aircraft navigation and positioning. As the aircraft is fast, so in aviation requirements by the receiver can adapt to high-speed movement. Board type - for satellite navigation and positioning. Because the satellite at speeds up to 7KM / S or more, so demanding on the receiver. 2) The geodetic-type receivers Geodetic-type receivers is mainly used for precise measurement of geodetic and precision engineering. Such instrument is mainly carried out by carrier phase observations relative positioning, high positioning accuracy. Apparatus complex, more expensive. &n |
actualización de datos: 10.12.2011