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Three dimensional imaging device using filtered ellipsoidal backprojection

  • US 5,090,245 A
  • Filed: 07/28/1989
  • Issued: 02/25/1992
  • Est. Priority Date: 05/02/1986
  • Status: Expired due to Term
First Claim
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1. A three dimensional active imaging device, using a reduced number of transmitted pulses, capable of generating a three dimensional image of reflecting points on or within objects in a three dimensional volume, within which the propagation velocities of the transmitted energy and the echo energy are known, said volume being external to a sparse array of transmitters and receivers, said device having multiple transmitters, comprising:

  • a) A transmitter which transmits a pulse of energy whcih radiates through a wide solid angle;

    b) A receiver means for detecting echoes, from the reflecting points, caused by said pulse of energy, simultaneously at the sparsely spaced receiver elements;

    c) A means for sampling said detected echoes from each receiver element of said sparsely spaced receiver elements whereby an echo sample set is created for the particular transmitter;

    d) A means for inverse triplet filtering said echo sample sets.e) A means for repeating a) through d) with different transmitters located at different positions whereby a different set of echo samples is created for each of the particular transmitters within the array of multiple transmitters;

    f) A means for selecting and combining with each other, for each image of a reflecting point, one echo sample from each receiver element from each echo sample set for each transmitter, said selecting and combining means utilizing, for selection, the sum of;

    distance from the transmitter to the point'"'"'s image divided by the known propagation velocity of the pulse of energy, and the distance form the point'"'"'s image to each receiver element divided by the known propagation velocity of the echoes.

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