Ch 21. Direct Position Estimation

Chapter Overview:

This chapter presents Direct Position Estimation (DPE), an innovative concept that helps overcoming some of the critical challenges and limitations in standard Global Navigation Satellite Systems (GNSS) position, navigation and timing (PNT). At a glance, DPE enables a receiver to compute position directly from the sampled signal, as opposite to a conventional receiver in which observables (i.e. pseudoranges) are required before solving for the user's position. By doing so, all satellite signals are jointly processed, making DPE a more robust GNSS position and time estimation technique than it's two-steps counterpart. Among the many benefits of such an architecture, it is remarkable the increased sensitivity at which the receiver can operate, which broadens the range of scenarios where GNSS can service. The chapter reviews the theoretical foundations of DPE as well as more practical aspects of its implementation, accompanied by a discussion and pointers to key references.

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