GPS-Objectives 1/2 Suitable for all classes of platform: aircraft, ship, land-based nd space(missiles and satellites) Able to handle a wide variety of dynamics Real-time positioning, velocity and time determination capability i The positioning results were to be available on a single global i Highest accuracy to be restricted to a certain class of user, i Resistant to jamming(intentional and unintentional) Redundancy provisions to ensure the survivability of the system 卫星定位技术与方法—袁林果 2005-2-25 GPS-Objectives 2/2 i Passive positioning system that does not require the transmission of signals from the user to the satellite(s) i able to provide the service to an unlimited number of users, World-wide coverage Low cost, low power, therefore as much complexity as possible should be built into the satellite segment, and Total replacement of the Transit 1 satellite and other terrestrial navaid systems 卫星定位技术与方法——袁林果 2005225(10 55 卫星定位技术与方法——袁林果 2005-2-25 9 ¾ Suitable for all classes of platform: aircraft, ship, land-based and space (missiles and satellites), ¾ Able to handle a wide variety of dynamics, ¾ Real-time positioning, velocity and time determination capability to an appropriate accuracy, ¾ The positioning results were to be available on a single global geodetic datum, ¾ Highest accuracy to be restricted to a certain class of user, ¾ Resistant to jamming (intentional and unintentional), ¾ Redundancy provisions to ensure the survivability of the system, GPS – Objectives 1/2 Objectives 1/2 卫星定位技术与方法——袁林果 2005-2-25 10 ¾ Passive positioning system that does not require the transmission of signals from the user to the satellite(s), ¾ Able to provide the service to an unlimited number of users, ¾ World-wide coverage ¾ Low cost, low power, therefore as much complexity as possible should be built into the satellite segment, and ¾ Total replacement of the Transit 1 satellite and other terrestrial navaid systems. GPS – Objectives 2/2 Objectives 2/2