Abstract: Satellites of a satellite positioning system broadcast within the navigation signals ephemeris data having a certain period of validity. At a mobile station, ephemeris data are required for position-fixing. In assisted satellite positioning systems, acquisition of navigation signals emitted by the satellites is facilitated as assistance data are provided to the mobile station. At a server station, a request for assistance data issued by the mobile station is received, and the server station transmits ephemeris data as part of the assistance data to the mobile station in response to its request. Upon receiving the request for assistance data issued by the mobile station, the server station decides whether the mobile station could achieve a specified position fix accuracy if the mobile station was provided with the broadcast ephemeris data. In the positive, the server station transmits the broadcast ephemeris data to the mobile station.

Abstract: A stacked multi-band antenna for a satellite positioning system comprises a stack of conductive patches, which are each dimension so as to be respectively operative in a dedicated frequency band. An excitation line section comprising pairs of conductive strips is arranged underneath the stack of conductive patches. Each pair of conductive strips is adapted for radiatively coupling to an associate conductive patch of the stack of conductive patches. An RF front end with at least one electric circuit is arranged in a triplate section underneath the excitation line section for operatively connecting the pairs of conductive strips to a satellite positioning receiver. The at least one electric circuit includes filters and amplifiers for respectively filtering and amplifying signals from the pairs of conductive strips, during antenna operation.

Abstract: A method of generating a spread-spectrum signal in a navigation system comprises the steps of providing a carrier wave and a modulation waveform and modulating the carrier wave with the modulation waveform. The modulation waveform comprises a so-called anti-phase linear combination of a BOC(1,1) waveform and a BOC(m,1) waveform, expressible as ?·BOC(1,1)??·BOC(m,1), where m represents an even integer number, ? and ? are non-zero coefficients of the same sign, indicating the relative power split between the BOC(1,1) waveform and the BOC(m,1) waveform.

Abstract: Generation of a set of spreading codes starts with determining first and second chaotic pseudo-random noise codes having delta-peak-like autocorrelation functions and a low cross-correlation function.

Abstract: “Satellites of a satellite positioning system broadcast within the navigation signals ephemeris data having a certain period of validity. At a mobile station, ephemeris data are required for position-fixing. In assisted satellite positioning systems, acquisition of navigation signals emitted by the satellites is facilitated as assistance data are provided to the mobile station. At a server station, a request for assistance data issued by the mobile station is received, and the server station transmits ephemeris data as part of the assistance data to the mobile station in response to its request. Upon receiving the request for assistance data issued by the mobile station, the server station decides whether the mobile station could achieve a specified position fix accuracy if the mobile station was provided with the broadcast ephemeris data. In the positive, the server station transmits the broadcast ephemeris data to the mobile station.