Apparatus and method using continuous-wave radiation for detecting and locating targets hidden behing a surface
First Claim
1. Apparatus for detecting a target hidden behind a surface, comprising:
- a transmitter that transmits a beam of continuous-wave radiation;
a first receiver disposed to receive such radiation reflected from a target; and
a second receiver disposed to receive such radiation reflected from the target, wherein the receivers are spaced from the transmitter and are spaced from one another according to predetermined spatial relationships such that the phase of reflected radiation received by the first receiver is in quadrature with the phase of reflective radiation received by the second receiver, and wherein the apparatus further comprises circuitry that combines signals derived from the receivers to produce an output.
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Accused Products
Abstract
Continuous-wave radiation is used to detect a target hidden behind a surface. In an embodiment, a transmitter directs a beam of continuous-wave microwave radiation from a transmitting location, and reflected radiation from the target is received at first and second receiving locations closer to the surface than the transmitting location. The transmitting and receiving locations have spatial relationships such that the phase of reflected radiation received at one receiving location is in quadrature with the phase of reflected radiation received at the other receiving location. In an embodiment, direct transmitted radiation is received at the receiving locations in quadrature.
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Citations
26 Claims
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1. Apparatus for detecting a target hidden behind a surface, comprising:
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a transmitter that transmits a beam of continuous-wave radiation;
a first receiver disposed to receive such radiation reflected from a target; and
a second receiver disposed to receive such radiation reflected from the target, wherein the receivers are spaced from the transmitter and are spaced from one another according to predetermined spatial relationships such that the phase of reflected radiation received by the first receiver is in quadrature with the phase of reflective radiation received by the second receiver, and wherein the apparatus further comprises circuitry that combines signals derived from the receivers to produce an output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of detecting a target hidden behind a surface, comprising:
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transmitting, from a transmitting location, a beam of continuous-wave radiation through the surface toward the target;
receiving, at a first receiving location spaced from the transmitting location, reflected radiation from the target;
receiving, at a second receiving location spaced from the transmitting location and from the first receiving location, reflected radiation from the target; and
producing an output from combined signals derived from the reflected radiation at the first and second receiving locations, wherein predetermined spatial relationships are provided between the transmitting location and each of the receiving locations and between each of the receiving locations, such that the phase of reflected radiation received at one of the receiving locations is in quadrature with the phase of reflected radiation received at the other receiving location. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification