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公开(公告)号：EP1381877A2
公开(公告)日：2004-01-21
申请号：EP02744120.3
申请日：2002-04-24
CPC分类号： G01S19/49 , G01C21/165 , G01S19/26
摘要： A method and system for integrating a IGS system and a GPS receiver. A predictive filter can measure signal quality from the GPS receiver and accordingly provide parameter estimates by appropriately weighting signal data from the GPS receiver and the IGS system. When GPS signal quality is high, the GPS signal data can be provided proportionately greater weight than the IGS system data, and the IGS/GPS integrated filter outputs can provide compensation to the IGS system for bias errors, etc. Alternately, if the GPS signal data is degraded or unavailable, the IGS signal data can be provided proportionately greater weight than the GPS signal data to provide higher quality inputs to the GPS receiver trackers than would otherwise be available.
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2.发明公开METHOD OF IMPROVING SATELLITE REACQUISITION PERFORMANCE FOR INTEGRATED GP/1G NAVIGATIONAL SYSTEMS 审中-公开方法提高的卫星NEUANSCHAFFUNGS效率综合GP / 1G导航系统
公开(公告)号：EP1409961A2
公开(公告)日：2004-04-21
申请号：EP02739150.7
申请日：2002-04-16
CPC分类号： G01S19/26 , G01C21/165 , G01S19/49
摘要： A method of reacquiring a satellite signal within an integrated GP/IG navigation system (100) comprising s a GPS unit (102) and an IG unit (104). The system detects a loss of synchronization between satellite signal timing code and a reference timing code, whrein position data is received from the IG unit (104) and representative of an estimated position of the navigation system (100). The system includes a DSP unit (112), which estimates a distance from the navigation system (100) to the satellite (106), as a function of the position data, and derives an initial delay from the distance. The DSP (112 delays the reference timing code, with respect to a satellite signal timing code, by an offset delay until the satellite timing code is synchronized with the reference timing code.
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公开(公告)号：EP1393093A2
公开(公告)日：2004-03-03
申请号：EP02739149.9
申请日：2002-04-16
IPC分类号： G01S1/00
CPC分类号： G01C21/165
摘要： A method of calibrating acceleration data signals from a set of accelerometers (115A, 115B, 115C) and angular rate data signals from a set of gyroscopes(120A, 120B, 120C) within a combined GPS/IGS includes generating navigation data as a function of the acceleration data signals, the angular rate data signals, and prior navigation data. The method further includes combining the navigation data with GPS data via a Kalman filter (155), so as to produce corrected navigation data, navigation correction data, acceleration correction data and angular rate correction data. The method further includes modifying the acceleration data signals as a function of the acceleration correction data so as to calibrate the acceleration data signals, and modifying the angular rate data signals as a function of the angular rate correction data, so as to calibrate the angular data signals.
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