Abstract: A method of acquiring a received spread spectrum signal comprises receiving a spread spectrum signal, analyzing the received signal to detect interference within the received signal, and adapting the baseband processing of the received signal to reduce power consumption during periods of detected interference. This allows the GPS processing resources to be focussed on areas of signal where there is little or no interference, and this is possible without modification to the source of interference. The interference is detected from an analysis of the received signal, and in particular before the baseband digital signal processing.

Abstract: A method of determining a GPS position fix is disclosed together with a corresponding GPS receiver and server for the same. The method comprising the steps of: (i) providing standard GPS ephemeris corresponding to that transmitted by a GPS satellite; (ii) providing supplemental GPS ephemeris including at least one parameter describing the fluctuation over time of at least one satellite orbit parameter of standard GPS ephemeris; (iii) measuring psuedoranges to GPS satellites; and (iv) determining a GPS position fix from both the standard and supplemental GPS ephemeris provided in steps (i) and (ii) respectively and the psuedoranges measured in step (iii).

Abstract: A method of appending a position stamp to an image file of a photo or video clip taken with a digital camera having a GPS antenna and a GPS RF front-end including an analogue to digital converter for receiving GPS signals and outputting GPS signal samples together with a digital camera and computer for the same.

Abstract: A method of creating an image file and a digital camera for the same. The method comprised the steps of: (i) generating and storing image data corresponding to a photo or video clip; (ii) sampling received GPS signals and storing the resultant GPS signal samples (hereafter “raw GPS data”); and (iii) creating a single file containing both the image data and the raw GPS data.

Abstract: A GPS RF front-end is disclosed comprising an antenna for receiving GPS signals, an analog to digital converter for sampling received GPS signals and interface circuitry for outputting the GPS signal samples. The GPS RF front-end is configured to vary the sample resolution of GPS signal samples outputted. Also disclosed is a corresponding method of providing a position fix, storage medium and apparatus for the same.

Abstract: A method of estimating the position of a first event of interest using a satellite positioning system. The method comprises: performing in response to the first event a satellite reception function; determining at some later time whether it is possible to calculate a position estimate from signals resulting from the satellite reception function; and, if not, estimating the position of the first event based on a position estimate of a second event, wherein the second event is that closest in time to the first for which a position estimate is available. Thus, the method can provide a position estimate for the first event even if the satellite reception function fails.

Abstract: A method of appending a position stamp to an image file of a photo or video clip taken with a digital camera having a GPS antenna and a GPS RF front-end including an analogue to digital converter for receiving GPS signals and outputting GPS signal samples together with a digital camera and computer for the same.

Abstract: A mobile device comprising a GPS receiver for receiving GPS signals; a communications receiver for receiving historical ephemeris data from an external server; and a processor configured to determine later ephemeris data from the historical ephemeris data and to determine a GPS position fix from the later ephemeris data. In particular, the later ephemeris data may be valid for a time period greater than any single set of the historical ephemeris data.

Abstract: A GPS receiver (10) is disclosed comprising a GPS antenna and a GPS RF front-end including an analogue to digital converter for sampling received GPS signals; and a processor for outputting, including to an external device, the GPS signal samples together with ancillary information either directly or indirectly describing characteristics of the GPS signal samples and/or the GPS signals contained therein. Also disclosed is a corresponding method of providing a position fix and a computer program, computer-readable storage medium and apparatus for the same.

Abstract: A method of appending a position stamp to an image file of a photo or video clip taken with a digital camera having a GPS antenna and a GPS RF front-end including an analogue to digital converter for receiving GPS signals and outputting GPS signal samples together with a digital camera and computer for the same.

Abstract: The present invention provides for a method of receiving a signal spread over a frequency range, and in particular a direct sequence spread spectrum signals including the step of employing a Fast Fourier Transform (FFT) in the Doppler search. In particular, the invention relates to the receipt of spread spectrum signals such as those transmitted as part of a GPS system.

Abstract: A vehicle data recorder comprises a front end RF receiver and a memory device for storing sampled satellite positioning signal data from the 5 front end receiver. The memory device stores a block of sampled data corresponding to a time period leading up to the time of an incident involving the vehicle. The data can be stored with a low cost system, and can be analysed after the incident by a remote data processing station.

Abstract: A method of acquiring a received spread spectrum signal comprises receiving a spread spectrum signal, analysing the received signal to detect interference within the received signal, and adapting the baseband processing of the received signal to reduce power consumption during periods of detected interference. This allows the GPS processing resources to be focussed on areas of signal where there is little or no interference, and this is possible without modification to the source of interference. The interference is detected from an analysis of the received signal, and in particular before the baseband digital signal processing.

Abstract: A method of appending a position stamp to an image file of a photo or video clip taken with a digital camera having a GPS antenna and a GPS RF front-end including an analogue to digital converter for receiving GPS signals and outputting GPS signal samples together with a digital camera and computer for the same.

Abstract: A mobile device comprising a GPS receiver for receiving GPS signals; a communications receiver for receiving historical ephemeris data from an external server; and a processor configured to determine later ephemeris data from the historical ephemeris data and to determine a GPS position fix from the later ephemeris data. In particular, the later ephemeris data may be valid for a time period greater than any single set of the historical ephemeris data.

Abstract: A method of appending a position stamp to an image file of a photo or video clip taken with a digital camera having a GPS antenna and a GPS RF front-end including an analogue to digital converter for receiving GPS signals and outputting GPS signal samples together with a digital camera and computer for the same.

Abstract: A method of creating an image file and a digital camera for the same.

Abstract: A method of generating a map display for a graphical user interface (GUI) comprising the steps of displaying a map, highlighting a first area on the map surrounding a first position fix wherein the size of the area corresponds to the accuracy of the first position fix and highlighting a second area on the map surrounding a second position fix wherein the size of the second area corresponds to the accuracy of the second position fix. Either (a) when the first and second areas overlap, either (i) the one corresponding to the most recent or accurate position fix is displayed on top of the other or (ii) the highlighting of the overlapping area is different from that of those parts of the first and second areas which do not overlap, or (b) the manner in which at least one of the position fixes is obtained is indicated by the color of the highlight. The area highlighted on the map surrounding the position fix may be a shape other than a circle.

Abstract: A GPS RF front-end is disclosed comprising an antenna for receiving GPS signals, an analog to digital converter for sampling received GPS signals and interface circuitry for outputting the GPS signal samples. The GPS RF front-end is configured to vary the sample resolution of GPS signal samples outputted. Also disclosed is a corresponding method of providing a position fix, storage medium and apparatus for the same.

Abstract: A method of acquiring a received spread spectrum signal, especially a GPS signal, is disclosed together with a spread spectrum signal receiver and a cellular telephone incorporating such a receiver. The method comprises the steps of: providing a replica signal containing a pseudorandom noise code, corresponding to that of the spread spectrum signal; providing a subject signal containing two fragments of the spread spectrum signal initially received during respective time periods between which a further time period elapses; and coherently correlating the replica signal with the subject signal over the two fragments.