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Radio navigation system using a constellation of positioning satellites with alternating transmission and analysis phasesRadio navigation system using a constellation of positioning satellites with alternating transmission and analysis phases description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070040736, Radio navigation system using a constellation of positioning satellites with alternating transmission and analysis phases. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is based on French Patent Application No. 05300284.6 filed Apr. 14, 2005, the disclosure of which is hereby incorporated by reference thereto in its entirety, and the priority of which is hereby claimed under 35 U.S.C. .sctn.119. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The invention relates to radio navigation satellite systems (RNSS) and global navigation satellite systems (GNSS), and more precisely to improving the navigation performance offered by those systems. [0004] 2. Description of the Prior Art [0005] In radio navigation systems such as GALILEO or GPS, determining the orbits of the satellites of the constellation of positioning satellites and clock synchronization are based on processing measurements effected by terrestrial control stations. Because of the terrestrial location of these stations relative to the satellites of the constellation (which are in medium Earth orbit), it is difficult to position the satellites very accurately. Moreover, the terrestrial location of these stations rules out the detection of certain operational signal anomalies, reflected in waveform distortion ("evil waveform"), for example. The operational signals are transmitted by the positioning satellites and are intended to enable the positions of GNSS or RNSS receivers, for example GPS receivers, to be determined. Consequently, any operational signal transmission anomaly is liable to limit the navigation performance of radio navigation satellite systems. [0006] In an attempt to improve the navigation performance of the next generations of GPS radio navigation systems, in particular the future "GPS III" version, it has been proposed to install on the positioning satellites thereof a so-called intersatellite ranging (ISR) transceiver dedicated to determining the pseudodistances between the satellites. However, those transceivers use dedicated signals that are totally different from the operational signals and therefore require specific time synchronization and calibration. This introduces additional complexity at the positioning satellite level and increases satellite fabrication costs. Furthermore, these transceivers are not able to determine operational signal transmission anomalies, as they process only dedicated signals. [0007] Thus one particular object of the invention is to solve some or all of the problems cited above and more particularly to improve the navigation performance of radio navigation satellite systems. SUMMARY OF THE INVENTION [0008] To this end the invention proposes a positioning satellite for a constellation of satellites of a radio navigation satellite system including transmitter means adapted to transmit operational signals intended to enable the determination of positions of radio navigation receivers, receiver means adapted to receive at least some of the operational signals transmitted by positioning satellites of the constellation that are in view (from the satellite) and processor means adapted to interrupt transmission of the operational signals by the transmitter means at selected times for a selected duration and to analyze during each transmission interruption at least some of the operational signals received by the receiver means during at least a portion of the selected duration. [0009] The positioning satellite of the invention may have other features, and in particular, separately or in combination: [0010] Its processor means may be adapted to interrupt transmission periodically to establish an alternation of transmission phases and analysis phases; [0011] the alternation is preferably offset in time from one positioning satellite of the constellation to another so that in each period each positioning satellite of the constellation has an analysis phase during which it is the only one to interrupt its transmission of operational signals; [0012] its processor means may be adapted to analyze the waveform of the received operational signals in order to detect signal distortion representing transmission anomalies and constituting analysis results; [0013] its processor means may be adapted to analyze the received operational signals in order to determine pseudodistances between their satellite and the satellites in view from which the operational signals come, the pseudodistances constituting analysis results; [0014] it may include calculator means adapted to determine the position of their satellite from the pseudodistances determined by the processor means and complementary radio navigation data, each position determined constituting an analysis result; [0015] its processor means may be adapted to instruct said transmitter means to transmit at least some of said analysis results to at least one terrestrial station of said radio navigation satellite system and/or to radio navigation receivers; [0016] its receiver means may be adapted to receive complementary operating data from at least one terrestrial station of the radio navigation satellite system and intended for other positioning satellites of the constellation; in this case, the processor means are adapted to instruct the transmitter means to transmit the complementary operating data received by the receiver means to the positioning satellites that are the destinations thereof. [0017] The invention also proposes a radio navigation satellite system equipped with a constellation of positioning satellites of the type described hereinabove. [0018] The invention is particularly well adapted, although not exclusively so, to GALILEO and GPS radio navigation satellite systems. [0019] Other features and advantages of the invention will become apparent after reading the following detailed description and examining the appended drawings. BRIEF DESCRIPTION OF THE DRAWINGS [0020] FIG. 1 is a diagram of a portion of a radio navigation satellite system of the invention. Continue reading about Radio navigation system using a constellation of positioning satellites with alternating transmission and analysis phases... Full patent description for Radio navigation system using a constellation of positioning satellites with alternating transmission and analysis phases Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Radio navigation system using a constellation of positioning satellites with alternating transmission and analysis phases patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Radio navigation system using a constellation of positioning satellites with alternating transmission and analysis phases or other areas of interest. ### Previous Patent Application: High frequency package, transmitting and receiving module and wireless equipment Next Patent Application: Apparatus and method for carrier phase-based relative positioning Industry Class: Communications: directive radio wave systems and devices (e.g., radar, radio navigation) ### FreshPatents.com Support Thank you for viewing the Radio navigation system using a constellation of positioning satellites with alternating transmission and analysis phases patent info. IP-related news and info Results in 0.18698 seconds Other interesting Feshpatents.com categories: Accenture , Agouron Pharmaceuticals , Amgen , AT&T , Bausch & Lomb , Callaway Golf 174 |
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