Self-calibrating reference terminal
First Claim
1. A method for calibrating a reference terminal used in locating a mobile terminal in a radiocommunication system comprising the steps of:
- transmitting, from said reference terminal, a signal burst associated with a location of said mobile terminal at a first time;
receiving, at said reference terminal, a portion of said signal burst associated with said location of said mobile terminal at a second time; and
calibrating at least one time delay within said reference terminal based on said first and second times.
1 Assignment
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Accused Products
Abstract
A reference terminal used in positioning/locating of mobile terminals in a radiocommunication system is described. The reference terminal includes a time-of-arrival (TOA) receiver which is used to provide information associated with the location of mobile terminals. The TOA receiver also performs the function of calibrating the time delays within the reference terminal by measuring time delays associated with each time-sensitive component. For example, when the reference terminal transmits an uplink signal burst, e.g., reporting TOA information associated with a particular mobile terminal, a portion of this signal energy can be captured and propagated through antenna cables within the reference terminal. The TOA receiver can be used to determine time delays associated with the returned signal energy through various paths, which delays can be used to calibrate the positioning information generated by the reference terminal.
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Citations
16 Claims
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1. A method for calibrating a reference terminal used in locating a mobile terminal in a radiocommunication system comprising the steps of:
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transmitting, from said reference terminal, a signal burst associated with a location of said mobile terminal at a first time; receiving, at said reference terminal, a portion of said signal burst associated with said location of said mobile terminal at a second time; and calibrating at least one time delay within said reference terminal based on said first and second times. - View Dependent Claims (2, 3, 4, 5)
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6. A method for calibrating a reference terminal used in a radiocommunication system comprising the steps of:
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measuring, in said reference terminal, a first delay associated with at least one first cable; measuring, in said reference terminal, a second delay associated with at least one second cable; and calibrating said reference terminal using said first and second measured delays. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A terminal device for use in a radiocommunication system comprising:
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a time reference unit connected to a first antenna via a first cable; a time-of-arrival (TOA) receiver connected to a second antenna via a second cable; a transceiver connected to a third antenna via a third cable; and means for using said TOA receiver to calibrate a time delay associated with said second cable. - View Dependent Claims (14, 15, 16)
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Specification