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Interference rejection in ultra-wideband real time locating systems

  • US 9,571,143 B2
  • Filed: 07/15/2013
  • Issued: 02/14/2017
  • Est. Priority Date: 06/06/2013
  • Status: Active Grant
First Claim
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1. An ultra-wideband (UWB) receiver comprising:

  • an antenna configured to receive a composite signal, the composite signal comprising a UWB signal and an interference signal;

    a tunable notch filter comprising a first mixer, a notch filter, a second mixer, a splitter, and a voltage controlled oscillator, the tunable notch filter configured to attenuate a part of the composite signal representing the interference signal thereby generating a filtered signal;

    a detector configured to receive the filtered signal from the tunable notch filter;

    a bias amplifier configured to;

    receive an output of the detector; and

    indicate changes in an operating point of the detector based on the output; and

    a controller configured to;

    monitor the changes indicated by the bias amplifier to determine an interference level associated with the filtered signal; and

    adjust the tunable notch filter to reduce the interference level in an instance in which the interference level is above a threshold level.

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