Analog decorrelation of ranging signals
First Claim
1. A method for determining a range to a transmitter, the method comprising:
- (a) receiving time-slotted spread spectrum signals from the transmitter;
(b) decorrelating the spread spectrum signals in an analog domain; and
(c) determining the range as a function of the decorrelated signals.
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Accused Products
Abstract
In a local positioning system, a receiver is adapted for receiving signals from a land-based transmitter. The receiver includes an analog decorrelator for decorrelating the transmitted spread spectrum signals. A down converter connected with an antenna may be spaced away from other portions of the receiver. The down converter down converts received ranging signals and provides them to the remotely spaced receiver portions. A signal line connecting the down converter to the receiver may be operable to transmit any two or more of a reference signal provided to the down converter, the down converted intermediate frequency signals provided to the receiver, and power provided to the down converter. The receiver may be positioned adjacent to or as part of a land-based transmitter. By determining positions of two or more antennas, the location of the associated transmitter is determined.
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Citations
32 Claims
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1. A method for determining a range to a transmitter, the method comprising:
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(a) receiving time-slotted spread spectrum signals from the transmitter; (b) decorrelating the spread spectrum signals in an analog domain; and (c) determining the range as a function of the decorrelated signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system for determining a range to a transmitter, the system comprising:
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an antenna; an analog mixer connected with the antenna, the analog mixer operable to mix signals received by the antenna with each of a plurality of replica spread spectrum codes; a switch connected with the analog mixer, the switch operable to select between each of the plurality of replica spread spectrum codes as a function of time; and a processor operable to determine the range to the transmitter as a function of mixed signals output from the analog mixer. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for determining a range to a transmitter, the method comprising:
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(a) receiving spread spectrum, X-band signals; (b) decorrelating the spread spectrum, X-band signals as analog signals; and (c) determining the range as a function of the decorrelated signals in response to one-way communication of the spread spectrum, X-band signals received in (a). - View Dependent Claims (28, 29, 30, 31, 32)
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Specification