Method for estimating parameters of a navigation signal

US7894983B2 · kind B2 · utility

Assignee

• DEUTSCHES ZENTRUM FÜR LUFT—UND RAUMFAHRT E.V. · DE

Inventors

• Bernhard Krach · Hilpoltstein, DE
• Michael Lentmaier · Munich, DE

Key dates

• Filing date: Dec 4, 2007
• Grant date: Feb 22, 2011
• Expiry date: Oct 25, 2029

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S19/22
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The method for estimating parameters of a navigation signal received by a receiver which receives navigation signals through a plurality of paths wherein the parameters include data modulated on the navigation signal and complex amplitudes i.e. amplitude and phase shift, and time delays of the individual paths, comprises receiving a navigation signal and sampling the received navigation signal. Moreover, the parameters are sequentially estimated in terms of a posterior probability density function. For facilitating the sequential estimation, the received vector is transformed into a compressed vector without loss of information by using a correlator bank having a plurality of correlator reference signals. The sets of samples representing the posterior probability function of the parameters are sequentially calculated by nonlinearly, recursively filtering the compressed vector and optionally predicting the complex amplitude and time delays by performing equivalent time delay shifts and phase shifts of the correlator signals of the correlator bank.