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Ambiguity estimation of GNSS signals for three or more carriers

Methods and apparatus are provided for factorized processing of a set of GNSS signal data derived from signals having at least three carriers. A geometry filter is applied to the set of GNSS signal data using a geometry carrier-phase combination to obtain an array of ambiguity estimates for the geometry carrier-phase combination and associated statistical information. A bank of ionosphere filters is applied to the set of GNSS signal data using a geometry-free ionosphere carrier-phase combination to obtain an array of ambiguity estimates for the ionosphere carrier-phase combination and associated statistical information. At least one bank of Quintessence filters is applied to the set of GNSS signal data using a geometry-free and ionosphere-free carrier-phase combination to obtain an array of ambiguity estimates for the geometry-free and ionosphere-free carrier-phase combination and associated statistical information. At least one code filter is applied to the set of GNSS signal data using a plurality of geometry-free and ionosphere-free code-carrier combinations to obtain an array of ambiguity estimates for the code-carrier combinations and associated statistical information. The resulting arrays are combined to obtain a combined array of ambiguity estimates for all carrier phase observations and associated statistical information.
Owner:TRIMBLE NAVIGATION LTD

Method of determining an impedance function of a loudspeaker

The invention relates to a method of determining an impedance function IF of a load LS driven by an amplifier AM, said method comprising the steps of providing a digital audio signal DAS to said amplifier AM, measuring one of either a current signal representation CSR of current provided to said load LS by said amplifier AM or a voltage signal representation VSR of voltage provided to said load LS by said amplifier AM, determining a digital signal representation DSR on the basis of said digital audio signal DAS, and determining said impedance function IF of said load LS on the basis of said digital signal representation DSR and said measured one of either said current signal representation CSR or said voltage signal representation VSR. The invention further relates to a load monitoring amplifier comprising amplification means AM comprising an amplifier input AI for receiving a digital audio signal DAS and an amplifier output AO for delivering an amplified signal to a load LS and an analog reading point AR establishing one of either a current signal representation CSR by measuring the current of said amplified signal delivered to said load LS or a voltage signal representation VSR by measuring the voltage of said amplified signal delivered to said load LS, said load monitoring amplifier further comprising a digital reading point DR for determining a digital signal representation DSR on the basis of said digital audio signal DAS and a monitoring means MM for determining an impedance function IF of said load LS on the basis of said digital signal representation DSR and said one of either said current signal representation CSR or said voltage signal representation VSR.
Owner:LAB GRUPPEN
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