U-blox Ag

Zhenlan Cheng

Eero Aho

Thomas Brauner

Paula Syrjärinne

Roderick Bryant

Toni Huovinen

Clemens Buergi

Kaspar Giger

Aku Levola

Barbara Baggini

A method and apparatus are provided for detecting GNSS signal lock. An example method includes tracking a plurality of signals received from a respective plurality of satellites in the GNSS, and calculating an individual frequency spectrum for each tracked signal in the plurality, to produce a plurality of individual frequency spectra. The example method further includes combining one or more values from several of the individual frequency spectra, to produce one or more combined values; and detecting an ensemble signal lock condition based at least in part on the one or more combined values.

Detecting GNSS signal lock

A method and apparatus are provided for demodulating a wireless signal modulated by phase-shift keying. The signal comprises a plurality of symbols. The method includes: obtaining a first sequence of samples based on the signal; converting the first sequence of samples to a first sequence of frequency domain samples; selecting, as a decision variable, the sample that has the maximum magnitude among the first sequence of frequency domain samples; and identifying a symbol or a symbol-transition based on the decision variable.

Demodulating a wireless signal modulated by phase-shift keying

A tracking loop and associated method for tracking a satellite signal in a GNSS receiver and for determining a line-of-sight (LOS) signal from a plurality of satellite signals received by the GNSS receiver from a satellite. One or more first correlators perform a correlation between a code signal derived from one of the received satellite signals and a plurality of corresponding replica code signals to determine a plurality of code correlation sums comprising a prompt code correlation sum, one or more early code correlation sums and one or more late code correlation sums. One or more second correlators correlate the plurality of code correlation sums with a plurality of replica carrier signals, each having a different Doppler frequency offset, to determine, for each of the plurality of code correlation sums, a set of correlation magnitudes at frequencies of the plurality of replica carrier signals. An LOS identification module identifies the LOS signal based on a signal propagation delay corresponding to one or more local maxima within the sets of correlation magnitudes.

Global Navigation Satellite System (GNSS) multipath mitigation

Methods, devices, systems, media, and receivers for processing GNSS signals are described. One aspect of the present disclosure provides a method for processing satellite signals of a Global Navigation Satellite System (GNSS), the method comprising: receiving a first GNSS signal transmitted in a first GNSS operational band by a satellite of the GNSS and a second GNSS signal transmitted in a second GNSS operational band by the satellite; tracking the first GNSS signal; generating, from the tracking of the first GNSS signal, tracking parameters for the first GNSS signal; and decoding, at least based on the tracking parameters for the first GNSS signal, the second GNSS signal, wherein the first GNSS operational band is one of L1 band, L2 band or L5 band, and the second GNSS operational band is L6 band.

Methods, devices, systems, media, and receivers for processing GNSS signals

A GNSS receiver having test signal based failure detection, comprises: a signal generator configured to generate a test signal, the test signal having characteristics of a GNSS signal; one of more amplifiers configured to amplify the test signal; a signal chain configured to receive the amplified test signal at an input node of the signal chain and process the received test signal; and a signal processor configured to: monitor the test signal by: obtaining one or more output signals of the device at one or more output node; recovering the test signal from the one or more output signals, and determining whether one or more errors occurred based on parameters of the recovered test signal based on parameters of the recovered test signal; identify a device failure based on the determined one or more errors; and generate notifications relating to the device failure.

Method and apparatus for diagnosing device failure

An apparatus for vector tracking a plurality of satellite signals received by a Global Navigation Satellite System (GNSS) receiver from a plurality of satellites and a method for use thereof. The apparatus comprises: a hypothesis determiner configured to determine a most likely velocity hypothesis from a plurality of velocity hypotheses based on a plurality of correlation values, and to transfer data related to the most likely velocity hypothesis to a navigation engine of the GNSS receiver for tracking the satellite signals, wherein the plurality of velocity hypotheses have been generated based on a navigation engine output indicative of a current and/or a previous extended velocity solution for the GNSS receiver; and wherein the plurality of correlation values have been determined by a plurality of correlators and represent correlations between a plurality of first signals each comprising an expected Doppler shift derived from one of the plurality of velocity hypotheses, and a plurality of second signals each comprising a true Doppler shift derived from one of the plurality of satellite signals.

Global navigation satellite system (GNSS) signal tracking

Methods and apparatus for tracking a plurality of satellite signals received by a Global Navigation Satellite System, GNSS, receiver from a plurality of satellites, each satellite signal being processed in a different one of a plurality of channels (--) of the GNSS receiver. At least one summing unit () is configured to sum corresponding correlation values from each of a plurality of sets of correlation values, each set from one of the plurality of channels, to determine a plurality of summed correlation values, wherein each correlation value in a set represents a correlation between a signal derived from a corresponding one of the plurality of received satellite signals, and one of a plurality of replica signals each based on a known position and/or velocity of the GNSS receiver and one of a plurality of estimated receiver timing parameters. A hypothesis evaluation unit () is configured to determine a maximum correlation value based on the plurality of summed correlation values, and to determine a most likely one of a plurality of receiver timing hypotheses to be the receiver timing hypothesis corresponding to the maximum correlation value.

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Thalwil, Switzerland

Zhenlan Cheng