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Short range, ultra-wideband radar with high resolution swept range gate

  • US 5,757,320 A
  • Filed: 12/17/1996
  • Issued: 05/26/1998
  • Est. Priority Date: 04/12/1993
  • Status: Expired due to Term
First Claim
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1. An apparatus for detecting a characteristic of objects within a field, comprising:

  • a transmitter, including a shielded transmit cavity and a transmit antenna within the shielded transmit cavity, which transmits a sequence of electromagnetic pulses in response to a transmit timing signal;

    a receiver, including a shielded receive cavity adjacent to the transmit cavity and a receive antenna within the shielded receive cavity, and a differential sampler having a first input connected to the receive antenna and a second input connected to ground, which samples echoes from objects within the field of the sequence of electromagnetic pulses with controlled timing, in response to a receive timing signal, and generates a sample signal in response to the samples, the sample signal indicating a characteristic of objects within the field;

    a timing circuit which supplies the transmit timing signal to the transmitter and supplies the receive timing signal to the receiver, the receive timing signal causing the receiver to sample the echoes such that time between transmission of pulses in the sequence and sampling by the receiver sweeps over a range of delays.

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