Functional Requirements of the Interface Between the NAVSTAR GPS Receiver Model X and the Advanced Inertial Reference Sphere. Volume II.

摘要

The performance requirements for the GPS X-set impose difficult and conflicting design problems on the receiver. To accurately track the incoming signals in a high-dynamics environment, a wide-bandwidth tracking loop is required with a high-order tracking network. For best performance in the presence of noise, on the other hand, a narrow bandwidth tracking loop is desired. Techniques for utilizing an Inertial Measurement Unit (IMU), such as the Advanced Inertial Reference Sphere (AIRS), to aid the receiver tracking loops are studied. The IMU can provide accurate information on translational accelerations and orientation changes experienced by the receiver. By properly using the IMU data, the receiver bandwidth can be reduced without increasing the dynamics-induced tracking error. The end result is an improvement in performance in noisy or jamming situations.