Cancellation system and method for a wireless positioning system
First Claim
1. A method for detecting low power Global Positioning System (“
- GPS”
) signals from a plurality of received GPS signals, the method comprising;
identifying one or more received GPS signals of the plurality of received GPS signals by a wireless device;
delaying the plurality of received GPS signals;
canceling less than the identified one or more received GPS signals of the plurality of received GPS signals from the delayed plurality of received GPS signals to create a resultant GPS signal;
demodulating and despreading the resultant GPS signal to create a first demodulated and despread GPS signal;
detecting at least one low power GPS signal relative to one of the plurality of received GPS signals from the first demodulated and despread GPS signaltransmitting the detected low power GPS signal to a stationary communication device;
comparing the transmitted low power GPS signal to a list of received GPS signals that the stationary communication device generated; and
determining whether the wireless device has detected signals from a sufficient number of satellites or additional information to assist the wireless device to detect any remaining needed signals.
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Accused Products
Abstract
A cancellation system that delays received Global Positioning System (“GPS”) signals and cancels less than all of the received GPS signals from the delayed version of the received GPS signals. A delay circuit produces a delayed version of the received GPS signals and a demodulator and despreader unit produces a demodulated and despread GPS signal corresponding to one of the received GPS signals. A respreader and remodulator unit produces a remodulated and respread GPS signal from the demodulated and despread GPS signal and a combiner produces a combined GPS signal from the delayed version of the received GPS signals and the remodulated and respread GPS signal. The cancellation system and method may also store the received GPS signals and cancel less than all the received GPS signals from the stored version of the received GPS signals.
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Citations
42 Claims
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1. A method for detecting low power Global Positioning System (“
- GPS”
) signals from a plurality of received GPS signals, the method comprising;identifying one or more received GPS signals of the plurality of received GPS signals by a wireless device; delaying the plurality of received GPS signals; canceling less than the identified one or more received GPS signals of the plurality of received GPS signals from the delayed plurality of received GPS signals to create a resultant GPS signal; demodulating and despreading the resultant GPS signal to create a first demodulated and despread GPS signal; detecting at least one low power GPS signal relative to one of the plurality of received GPS signals from the first demodulated and despread GPS signal transmitting the detected low power GPS signal to a stationary communication device; comparing the transmitted low power GPS signal to a list of received GPS signals that the stationary communication device generated; and determining whether the wireless device has detected signals from a sufficient number of satellites or additional information to assist the wireless device to detect any remaining needed signals. - View Dependent Claims (2, 3, 4, 5, 6)
- GPS”
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7. A method for detecting at least one low power GPS signal from a plurality of received GPS signals, the method comprising:
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identifying one or more received GPS signals of the plurality of received GPS signals by a wireless device; storing the plurality of received GPS signals; canceling less than the identified one or more received GPS signals of the plurality of received GPS signals from the stored plurality of received GPS signals to create a resultant GPS signal; demodulating and despreading the resultant GPS signal to create a first demodulated and despread GPS signal; detecting the at least one low power GPS signal relative to one of the plurality of received GPS signals from the first demodulated and despread GPS signal; calculating a pseudo range for the wireless device from the detected at least one low power GPS signal transmitting the detected low power GPS signal to a stationary communication device; comparing the transmitted low power GPS signal to a list of received GPS signals that the stationary communication device generated; and determining whether the wireless device has detected signals from a sufficient number of satellites or additional information to assist the wireless device to detect any remaining needed signals. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A cancellation system, for detecting low power signals from a plurality of received GPS signals, the cancellation system comprising:
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a wireless device including at least one of the following; means for identifying one or more received GPS signals of the plurality of received GPS signals; means for delaying the plurality of received GPS signals; means for canceling less than the identified one or more received GPS signals of the plurality of received GPS signals from the delayed plurality of received GPS signals to create a resultant GPS signal; means for demodulating and despreading the resultant GPS signal to create a first demodulated and despread GPS signal; means for detecting at least one low power signal relative to one of the plurality of received GPS signals from the first demodulated and despread GPS signal; and means for transmitting the detected low power signal; and a stationary communication device including at least one of the following; means for comparing the transmitted low power signal to a list of received GPS signals that the stationary communication device generated; and means for determining whether the wireless device has detected signals from a sufficient number of satellites or additional information to assist the wireless device to detect any remaining needed signals. - View Dependent Claims (14, 15, 16, 17)
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18. A cancellation system for detecting low power signals from a plurality of received GPS signals, the cancellation system comprising:
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a wireless device including at least one of the following; means for identifying one or more received GPS signals of the plurality of received GPS signals; means for storing the plurality of received GPS signals; means for canceling less than the identified one or more received GPS signals of the plurality of received GPS signals from the stored plurality of received GPS signals to create a resultant GPS signal; means for demodulating and despreading the resultant GPS signal to create a first demodulated and despread GPS signal; means for detecting at least one low power signal relative to one of the plurality of received GPS signals from the first demodulated and despread GPS signal; means for calculating a pseudo range for the wireless device from the detected at least one low power GPS signal; and means for transmitting the detected low power signal; and a stationary communication device including at least one of the following; means for comparing the transmitted low power signal relative to a list of received GPS signals that the stationary communication device generated; and means for determining whether the wireless device has detected signals from a sufficient number of satellites or additional information to assist the wireless device to detect any remaining needed signals. - View Dependent Claims (19, 20, 21, 22)
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23. A cancellation system for detecting low power signals from a plurality of received GPS signals, the cancellation system comprising:
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a wireless device including at least one of the following; a controller that identifies one or more received GPS signals of the plurality of received GPS signals; a delay circuit; a first demodulator and despreader unit that produces a first demodulated and despread GPS signal corresponding to the identified one or more received GPS signals of the plurality of received GPS signals; a remodulator and respreader unit in signal communication with the first demodulator and despreader unit, the remodulator and respreader unit produces a respread and remodulated GPS signal from the first demodulated and despread GPS signal; a combiner in signal communication with the delay circuit and the remodulator and respreader unit, the combiner produces a combined GPS signal from the output of the delay circuit and the respread and remodulated GPS signal; a second demodulator and second despreader unit that produces a second demodulated and despread GPS signal from the combined GPS signal, wherein the second demodulator and second despreader unit detects at least one available GPS signals based on the second demodulated and despread GPS signal; and a radio module that facilitates transmitting the at least one detected available GPS signals; and a stationary communication device that receives the at least one detected available GPS signals from the radio module of the wireless device, compares the transmitted low power GPS signal to a list of received GPS signals that the stationary communication device generated, and determines whether the wireless device has detected GPS signals from a sufficient number of satellites or additional information to assist the wireless device to detect any remaining needed GPS signals. - View Dependent Claims (24, 25, 26, 27, 28)
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29. A cancellation system for detecting low power GPS signals from a plurality of received signals, the cancellation system comprising:
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a wireless device including at least one of the following; a controller that identifies one or more received GPS signals of the plurality of received signals; a matched filter unit that produces a demodulated and despread signal corresponding to the identified one or more received GPS signals of the plurality of the received signals; a storage unit that stores the plurality of received GPS signals; a remodulator and respreader unit in signal communication with the matched filter unit, the remodulator and respreader unit produces a respread and remodulated GPS signal from the output of the matched filter; a combiner in signal communication with the storage unit and the remodulator and respreader unit, the combiner produces a combined GPS signal from the output of the storage unit and the remodulated and respread GPS signal; a demodulator and second despreader unit that produces a first demodulated and despread GPS signal from the received combined GPS signal, wherein the demodulator and second despreader unit detects at least one available GPS signals based on the first demodulated and despread GPS signal; and a radio module that facilitates transmitting the at least one detected available GPS signals; and a stationary communication device that receives the at least one detected available GPS signals from the radio module of the wireless device, compares the transmitted low power GPS signal to a list of received GPS signals that the stationary communication device generated, and determines whether the wireless device has detected GPS signals from a sufficient number of satellites or additional information to assist the wireless device to detect any remaining needed GPS signals. - View Dependent Claims (30, 31, 32)
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33. A non-transitory computer readable medium having software for detecting low power signals from a plurality of received signals for a cancellation system, the non-transitory computer readable medium being located at a wireless device, the software comprising:
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logic configured to identify one or more received signals of the plurality of received signals; logic configured to delay the plurality of received signals; logic configured to cancel less than the identified one or more received signals of the plurality of received signals from the delayed plurality of received signals to create a resultant signal; logic configured to demodulate and despread the resultant signal to create a first demodulated and despread signal; logic configured to detect at least one power signal from the first demodulated and despread signal; and logic for transmitting the at least one detected low power signal to a stationary communication device, wherein the stationary communication device compares the at least one transmitted low power signal to a list of received GPS signals that the stationary communication device generated, and determines whether the wireless device has detected GPS signals from a sufficient number of satellites or additional information to assist the wireless device to detect any remaining needed GPS signals. - View Dependent Claims (34, 35)
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36. The non-transitory computer readable medium 35 wherein the combining logic further includes:
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logic configured to demodulate the plurality of received signals to create a demodulated signal; and logic configured to despread the demodulated signal to create a second demodulated and despread signal. - View Dependent Claims (37)
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38. A non-transitory computer readable medium having software for detecting low power signals from a plurality of received signals for a cancellation system, the software comprising:
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logic configured to identify one or more received signals of the plurality of received signals; logic configured to store the plurality of received signals; logic configured to cancel less than the identified one or more received signals of the plurality of received signals from the stored plurality of received signals to create a resultant signal; logic configured to demodulate and despread the resultant signal to create a first demodulated and despread signal; logic configured to detect at least one lower power signal from the first demodulated and despread signal; logic for calculating a pseudo range for a wireless device from the detected at least one low power signal; and logic for transmitting the detected low power signal to a stationary communication device, wherein the stationary communication device compares the transmitted low power signal to a list of received GPS signals that the stationary communication device generated, and determines whether the wireless device has detected GPS signals from a sufficient number of satellites or additional information to assist the wireless device to detect any remaining needed GPS signals. - View Dependent Claims (39, 40, 41, 42)
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Specification