Abstract: The techniques disclosed herein may include receiving proximity messages during a first time period via a wireless personal area network. Each proximity message may include a proximity identifier calculated using a unique identifier for a proximate electronic device. In addition, the techniques may include retrieving, from a database, a set of device identifiers corresponding to devices in the first electronic device's contact list. The techniques may include for each message: determining whether the proximity identifier of the proximate electronic device matches a device identifier, thereby determining matching proximity messages. Moreover, the techniques may include generating an event score for the first time period based on the matching proximity messages, the event score having a probability that an event has occurred between the first electronic device another device. Also, the techniques may include determining whether an event has occurred by comparing the event score to an event threshold.

Abstract: A method of processing offset carrier modulated, OCM, ranging signals in a radionavigation system including a plurality of satellite-borne transmitters and at least one ground-based receiver includes receiving a first radionavigation signal from at least one of the plurality of satellite-borne transmitters and down-converting and digitizing the first radionavigation signal to derive therefrom a first OCM signal SA, receiving a second signal SB synchronously broadcast with the first OCM signal SA, the second signal SB having the same or substantially the same center frequency as the first OCM signal SA, coherently combining the first OCM signal SA with the second signal SB at the receiver to generate a combined signal SC, generating a combined correlation value YC corresponding to a correlation of the combined signal SC with a local replica of the first OCM signal SC, and deriving ranging information based on the combined correlation value YC.

Abstract: The invention provides an atmospheric monitoring and measurement system based on the processing of global navigation satellite system radio-frequency signals. The invention is characterized by an open-loop demodulation architecture to extract amplitude and phase information from the received satellite signals, and a signal processing technique which can provide statistics relating to the amplitude and phase variations induced by the atmosphere.

Abstract: A method of processing offset carrier modulated, OCM, ranging signals in a radionavigation system including a plurality of satellite-borne transmitters and at least one ground-based receiver includes receiving a first radionavigation signal from at least one of the plurality of satellite-borne transmitters and down-converting and digitizing the first radionavigation signal to derive therefrom a first OCM signal SA, receiving a second signal SB synchronously broadcast with the first OCM signal SA, the second signal SB having the same or substantially the same center frequency as the first OCM signal SA, coherently combining the first OCM signal SA with the second signal SB at the receiver to generate a combined signal SC, generating a combined correlation value YC corresponding to a correlation of the combined signal SC with a local replica of the first OCM signal SC, and deriving ranging information based on the combined correlation value YC.

Abstract: The invention provides an atmospheric monitoring and measurement system based on the processing of global navigation satellite system radio-frequency signals. The invention is characterized by an open-loop demodulation architecture to extract amplitude and phase information from the received satellite signals, and a signal processing technique which can provide statistics relating to the amplitude and phase variations induced by the atmosphere.