GPS data recorder and playback system
First Claim
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1. An apparatus for collecting GPS data comprising:
- a down converter configured to receive a radio frequency (RF) GPS signal and to produce an intermediate frequency (IF) signal therefrom;
an analog to digital converter coupled to the down converter and configured to convert the intermediate frequency signal to GPS data in a digital format;
an interface board coupled to the analog to digital converter and the long-term storage device and configured to produce GPS data bytes from the GPS data in digital format; and
a storage interface to couple a storage device to the interface board, the storage device configured to store the GPS data bytes.
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Abstract
A circuit for storing GPS data gathered in the field is described. The stored data is later used to test the ability of GPS processing circuits to handle GPS data containing multipath interference and dropouts.
23 Citations
28 Claims
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1. An apparatus for collecting GPS data comprising:
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a down converter configured to receive a radio frequency (RF) GPS signal and to produce an intermediate frequency (IF) signal therefrom; an analog to digital converter coupled to the down converter and configured to convert the intermediate frequency signal to GPS data in a digital format; an interface board coupled to the analog to digital converter and the long-term storage device and configured to produce GPS data bytes from the GPS data in digital format; and a storage interface to couple a storage device to the interface board, the storage device configured to store the GPS data bytes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of generating test data in an area comprising:
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moving a GPS antenna about the area while receiving radio frequency GPS signals; digitizing the GPS signals to produce digital GPS data; storing the digital GPS data on a long-term storage device for use as test data; and disconnecting the GPS antenna from the long-term storage device. - View Dependent Claims (13, 14, 15)
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16. A method of testing a circuit for processing GPS data comprising:
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providing previously stored GPS data to a GPS processing circuit; and processing the previously stored GPS data in the GPS processing circuit to compute location at which the previously stored GPS data was collected. - View Dependent Claims (17, 18, 21, 23)
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19. The method of claim further comprising:
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disconnecting the long-term storage device including stored GPS data from the first GPS processing circuit; coupling the long-term storage device including stored GPS data to a second GPS processing circuit; and testing the second GPS processing circuit using the stored GPS data. - View Dependent Claims (20, 22)
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24. A method of testing a GPS circuit comprising:
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producing position and velocity output using a GPS processor while recording the GPS data to generate recorded data; and processing the recorded data using said GPS processor to recreate the position and velocity output.
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25. An apparatus for collecting GPS data comprising:
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a down converter configured to receive a radio frequency (RF) GPS signal and to produce an intermediate frequency (IF) signal therefrom; an analog to digital converter coupled to the down converter and configured to convert the intermediate frequency signal to GPS data in a digital format; a storage interface coupled to the analog to digital converter; and a long-term storage device coupled to the storage interface, the long-term storage device configured to store the GPS data in digital format. - View Dependent Claims (26, 27, 28)
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Specification