OPTIMAL CODING OF GPS MEASUREMENTS FOR PRECISE RELATIVE POSITIONING

摘要

A system for coding GPS measurements in a vehicle satellite communications system. The system includes a stand-alone position and velocity estimator that generates an estimated latent state vector from GPS measurements received at a first time and a prediction of a latent state vector from a previous time. The system also includes an observation prediction model that calculates an observation prediction from the estimated latent state vector. The system further includes a first differencer that provides a difference between the observation prediction and the GPS measurements, and a first Huffman encoder that provides a coded output from the difference. The system also includes a state prediction model that provides the predicted latent state vector and a second differencer that provides a difference between the estimated latent state vector and the predicted latent state vector. A second Huffman encoder encodes the difference from the second differencer.