Assisted GPS signal detection and processing system for indoor location determination
First Claim
1. A system for obtaining position information from satellite navigation signals, comprising:
- a master navigation signal receiver having an antenna disposed with clear sky access to a plurality of navigation satellites, said master navigation signal receiver receiving satellite navigation signals from said plurality of navigation satellites, and relaying an assisted satellite navigation signal via a medium, said assisted navigation signal including at least one of satellite location information, clock correction information, and frequency discipline information; and
at least one end user signal receiver having an antenna, said at least one end user signal receiver coupled to said medium to receive said assisted navigation signal from said master navigation signal receiver, said at least one end user signal receiver also receiving said satellite navigation signals directly through said antenna;
wherein, said satellite navigation signals may be at least partially attenuated prior to receipt by said at least one end user signal receiver by passing through physical structures, and in such case, said at least one end user signal receiver recovering end user position information from said at least partially attenuated satellite navigation signals by use of said assisted navigation signal.
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Abstract
An assisted GPS signal detection and processing system enables an end user to obtain position information from satellite navigation signals in indoor environments that have excess signal attenuation. The system includes a master navigation signal receiver having an antenna disposed with clear sky access to a plurality of navigation satellites. The master navigation signal receiver receives satellite navigation signals from the plurality of navigation satellites, and relays an assisted satellite navigation signal to a plurality of end user signal receivers via a medium. The assisted navigation signal includes at least one of satellite location information, clock correction information, and frequency discipline information. The end user signal receivers each have an antenna for receiving the satellite navigation signals directly. The end user signal receivers are also coupled to the medium to receive the assisted navigation signal from the master navigation signal receiver. The satellite navigation signals received by the end user signal receivers via the antennas may be at least partially attenuated due to passing through physical structures. The end user signal receivers are able to recover end user position information from the attenuated satellite navigation signals by use of the assisted navigation signal.
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Citations
43 Claims
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1. A system for obtaining position information from satellite navigation signals, comprising:
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a master navigation signal receiver having an antenna disposed with clear sky access to a plurality of navigation satellites, said master navigation signal receiver receiving satellite navigation signals from said plurality of navigation satellites, and relaying an assisted satellite navigation signal via a medium, said assisted navigation signal including at least one of satellite location information, clock correction information, and frequency discipline information; and
at least one end user signal receiver having an antenna, said at least one end user signal receiver coupled to said medium to receive said assisted navigation signal from said master navigation signal receiver, said at least one end user signal receiver also receiving said satellite navigation signals directly through said antenna;
wherein, said satellite navigation signals may be at least partially attenuated prior to receipt by said at least one end user signal receiver by passing through physical structures, and in such case, said at least one end user signal receiver recovering end user position information from said at least partially attenuated satellite navigation signals by use of said assisted navigation signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A system for obtaining position information from satellite navigation signals, comprising:
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a master navigation signal receiver having an antenna disposed with clear sky access to a plurality of navigation satellites, said master navigation signal receiver receiving satellite navigation signals from said plurality of navigation satellites, and relaying an assisted satellite navigation signal via a medium comprising a cable plant, said assisted navigation signal comprising said satellite navigation signals from said plurality of navigation satellites translated to a selected frequency; and
at least one end user signal receiver having an antenna, said at least one end user signal receiver coupled to said medium to receive said assisted navigation signal from said master navigation signal receiver, said at least one end user signal receiver also receiving said satellite navigation signals directly through said antenna;
wherein, said satellite navigation signals may be at least partially attenuated prior to receipt by said at least one end user signal receiver by passing through physical structures, and in such case, said at least one end user signal receiver recovering end user position information from said at least partially attenuated satellite navigation signals by use of said assisted navigation signal. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A system for obtaining position information from satellite navigation signals, comprising:
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a master navigation signal receiver having an antenna disposed with clear sky access to a plurality of navigation satellites, said master navigation signal receiver receiving satellite navigation signals from said plurality of navigation satellites, and relaying an assisted satellite navigation signal via a medium comprising a cable plant, said assisted navigation signal comprising a disciplined GPS pilot signal containing a broadcast data message from all satellites in view at the master navigation signal receiver; and
at least one end user signal receiver having an antenna, said at least one end user signal receiver coupled to said medium to receive said assisted navigation signal from said master navigation signal receiver, said at least one end user signal receiver also receiving said satellite navigation signals directly through said antenna;
wherein, said satellite navigation signals may be at least partially attenuated prior to receipt by said at least one end user signal receiver by passing through physical structures, and in such case, said at least one end user signal receiver recovering end user position information from said at least partially attenuated satellite navigation signals by use of said assisted navigation signal. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43)
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Specification