GNSS line bias measurement system and method
First Claim
Patent Images
1. A differential carrier phase position detection system, comprising:
- one or more antennas for receiving carrier signals;
a receiver for determining position information for the one or more antennas in response to a clock signal and intermediate frequency signals from the antennas;
at least one antenna adapter module for interfacing between a first one of the antennas and the receiver and generating the intermediate frequency signal in response to the carrier signals and the clock signal; and
at least one antenna communications path for transmitting the clock signal to the antenna adapter module and for transmitting the intermediate frequency signal to the receiver, said system providing phase measurements of the carrier signals that are substantially independent of delay in the antenna communications path.
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Abstract
A number of solutions for deriving the line bias are disclosed. Some of these solutions utilize signal processing and judicious selection of the frequency plan used in the position detection systems to either enable the derivation of the line bias, or make the measurements insensitive to line bias. In other examples, the present invention utilizes measurement schemes for deriving the line bias and enabling a position detection system to process line bias information in order to find a position solution
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Citations
53 Claims
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1. A differential carrier phase position detection system, comprising:
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one or more antennas for receiving carrier signals;
a receiver for determining position information for the one or more antennas in response to a clock signal and intermediate frequency signals from the antennas;
at least one antenna adapter module for interfacing between a first one of the antennas and the receiver and generating the intermediate frequency signal in response to the carrier signals and the clock signal; and
at least one antenna communications path for transmitting the clock signal to the antenna adapter module and for transmitting the intermediate frequency signal to the receiver, said system providing phase measurements of the carrier signals that are substantially independent of delay in the antenna communications path. - View Dependent Claims (2, 3)
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4. A method for rendering a differential carrier phase position detection system substantially insensitive to line bias, the method comprising:
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receiving carrier signals at one or more antennas;
generating a clock signal and transmitting the clock signal to a first one of the antennas;
generating an intermediate frequency signal in response to the carrier signals and the clock signal at the first one of the antennas;
transmitting the intermediate signal to a receiver; and
determining position information at the receiver for the antennas, position information for the first one of the antennas being generated in response to the clock signal and the intermediate frequency signal from the first one of the antennas. - View Dependent Claims (5, 6)
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7. A differential carrier phase position detection system having line bias compensation, the system comprising:
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antennas for receiving carrier signals;
a receiver for determining position information for the antennas in response to a clock signal and an intermediate frequency signal from the antennas;
at least one antenna adapter module for interfacing between a first one of the antennas and the receiver and generating the intermediate frequency signal in response to the carrier signals and the clock signal, and generating a compensation signal;
at least one antenna communications path for transmitting the clock signal to the antenna adapter module and for transmitting the intermediate frequency signal and the compensation signal to the receiver; and
a line bias compensation module for determining a correction to a phase of the intermediate frequency signal in response to the compensation signal, the correction being used by the receiver to determine the position information. - View Dependent Claims (8, 9, 10, 11)
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12. A method for compensating for line bias in a differential carrier phase position detection system, the method comprising:
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receiving carrier signals at antennas;
generating a clock signal and transmitting the clock signal to a first one of the antennas;
generating an intermediate frequency signal in response to the carrier signals and the clock signal at the first one of the antennas;
generating a compensation signal at the first one of the antennas;
transmitting the intermediate signal and the compensation signal to a receiver; and
determining position information at the receiver for the antennas, position information for the first one of the antennas being generated at least in response to the intermediate frequency signal and the compensation signal from the first one of the antennas. - View Dependent Claims (13, 14)
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- 15. A specified-delay antenna communications cable for a position detection system, the communications cable for connecting an antenna to a receiver that uses a delay of the communications cable to determine position information for the antenna, the cable comprising an indication of a length and/or signal delay associated with the cable.
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25. A method for using communications cable for a carrier phase position detection system, the method comprising:
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measuring a delay of the communications cable;
providing delay information characterizing the delay with the cable; and
entering the delay information into the carrier phase position detection system. - View Dependent Claims (26, 27, 28)
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29. A differential carrier phase position detection system having line bias compensation, the system comprising:
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antennas for receiving carrier signals;
a receiver for determining position information for the antennas in response to a clock signal and carrier signal information from the antennas;
a communications cable connecting the receiver to at least one of the antennas to transmit the carrier signal information to the receiver; and
a communications cable delay detector for determining a delay of the communications cable by transmitting test signals over the communications cable. - View Dependent Claims (30, 31, 32)
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33. A differential carrier phase position detection system having line bias compensation, the system comprising:
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antennas for receiving carrier signals;
a communications cable connecting the receiver to at least one of the antennas to transmit the carrier signal information to the receiver;
a temperature detector for detecting changes in temperature that indicate changes in a temperature of the communications cable;
a line bias module for using temperature information from temperature detector to determine a delay of the communications cable; and
a position solution module for determining position information for the antennas in response to carrier signal information from the antennas and the delay of the communications cable. - View Dependent Claims (34, 35)
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36. A method for determining position of an antenna with a carrier phase receiver, the method comprising:
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receiving carrier signals at the antenna;
transmitting a clock signal to the antenna over a communications cable from the receiver;
detecting a temperature of the communications cable;
transmitting carrier signal information from the antenna to the receiver;
relating the temperature of the communications cable to changes in delay of the communications cable; and
the receiver determining a position of the antenna in response to the carrier signal information and the changes in delay of the communications cable. - View Dependent Claims (37, 38, 39, 40, 41)
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42. A method for determining the relative position of a first antenna and a second antenna, the first antenna being connected to a receiver via a cable, the method comprising:
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measuring a delay associated with the cable by sending a signal from the receiver to the first antenna; and
determining the relative position of the first and second antennas from the delay. - View Dependent Claims (43, 44, 45, 46)
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47. A method for determining the relative position of a first antenna and a second antenna, the first antenna being connected to a receiver via a cable and the second antenna connected to the receiver via a second cable, the method comprising:
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a. generating differential carrier phase measurements between the first and second antennas by i. transmitting signal information bi-directionally between the receiver and the first and second antennas;
ii. measuring phases of at least some of said signal information for the first and second antennas; and
iii. subtracting phases for the second antenna from phases for the first antenna;
b. calculating the relative position of the first and second antennas from the differential carrier phase measurements generated in step a. - View Dependent Claims (48, 49, 50, 51, 52, 53)
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Specification