However, [Andrew’s] article is a bit more up-to-date and features plenty of theory itself. He explains how he built his four-channel GPS receiver, able to track four satellites at the same time.

Written to accelerate the understanding of the GPS system and encourage new and innovative applications, this fundamental volume deals with the operation and theory of basic GPS and provides coverage ...

The previous chapters described the hardware and software needed to make GPS observations in the receiver. This chapter focuses on how these observations are processed to form a navigation solution.

"The core of the GPS system was developed in the mid-1960s. At the time, the theory behind it did not provide any guarantee ...