Method and apparatus for compensating unexpected frequency shifts in positioning receivers
First Claim
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1. A receiver, comprising:
- a first oscillator;
a second oscillator locked to the first oscillator;
a frequency shift detector coupled to the first oscillator and the second oscillator, the frequency shift detector providing a transient detect signal; and
a data processor coupled to the frequency shift detector, the data processor receiving the transient detect signal and selecting a frequency offset for signal acquisition in response to the transient detect signal.
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Abstract
Unexpected frequency shifts in GPS receivers are compensated by utilizing a shock detector or temperature transient detector. The detector can be utilized with a GPS receiver and provides a signal to adjust the signal-search algorithm. The signal-search algorithm is able to acquire or reacquire a satellite signal more quickly when adjusted by the shock detector. The receiver can be utilized in guided munitions and other vehicles which are susceptible to temperature transients and mechanical shocks.
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Citations
19 Claims
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1. A receiver, comprising:
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a first oscillator; a second oscillator locked to the first oscillator; a frequency shift detector coupled to the first oscillator and the second oscillator, the frequency shift detector providing a transient detect signal; and a data processor coupled to the frequency shift detector, the data processor receiving the transient detect signal and selecting a frequency offset for signal acquisition in response to the transient detect signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A positioning system receiver having reduced signal acquisition time after a large acceleration, the positioning system receiver comprising:
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a reference oscillator; a phase or frequency locked loop including a voltage-controlled oscillator; a positioning system signal processor receiving an intermediate frequency signal; a frequency shift detector coupled to the reference oscillator and the voltage-controlled oscillator, the frequency shift detector providing a transient detect signal; and a positioning system data processor coupled to the frequency shift detector and to the positioning system signal processor, the positioning system data processor receiving the transient detect signal and providing a control signal to the positioning system signal processor, the control signal is provided in accordance with a signal-search algorithm in response to the transient detect signal. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A positioning system receiver for determining a location in response to a plurality of satellite signals, the positioning system receiver comprising:
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a plurality of oscillators; signal processor means for receiving a form of at least one of the satellite signals and decoding the at least one satellite signal; means for detecting shift between signals from the oscillators; and data processor means for controlling the signal processor means in accordance with the shift. - View Dependent Claims (16, 17, 18, 19)
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Specification