Depression angle ranging system and methods
First Claim
1. A system for detecting the range and/or elevation of a target comprising:
- (a) an antenna system having first and second planes of receipt which are inclined a fixed angle (θ
) from one another, said antenna system being located along the line of intersection of said planes and said antenna system including means for sweeping said line of intersection at a known rate of sweep (γ
);
(b) means for measuring the delay (Δ
T1) between receipt of a signal directly from said target in said first plane and reflected from a remote surface in said first plane;
(c) means for measuring the delay (Δ
T2) between receipt of a signal from said target in said first plane and then in said second plane as said first and second planes rotate;
(d) means for measuring the height (RH) of said antenna system; and
(e) means for calculating the range and/or elevation of said target in response to θ
, γ
, Δ
T1, Δ
T2 and RH.
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Accused Products
Abstract
A system and related methods for passively detecting range and/or elevation of a signal emitting target by employing an X-beam antenna system which has a fixed angle θ between planes of receipt and which rotates those planes of receipt at a rate of sweep γ. A first correlator is employed to measure the time delay ΔT1 between receipt of a signal directly from a target in the first plane of the X-beam and receipt of a signal from the target in that first plane but reflected from a remote surface. A second correlator is employed to measure the time delay ΔT2 between receipt of a signal from the target in the first plane and subsequent receipt of a signal from that target in the second plane as the first and second planes rotate. Receiver altitude RH is measured by conventional means and thereafter target range and/or elevation is calculated in response to θ, γ, ΔT1, ΔT2 and RH.
63 Citations
10 Claims
-
1. A system for detecting the range and/or elevation of a target comprising:
-
(a) an antenna system having first and second planes of receipt which are inclined a fixed angle (θ
) from one another, said antenna system being located along the line of intersection of said planes and said antenna system including means for sweeping said line of intersection at a known rate of sweep (γ
);(b) means for measuring the delay (Δ
T1) between receipt of a signal directly from said target in said first plane and reflected from a remote surface in said first plane;(c) means for measuring the delay (Δ
T2) between receipt of a signal from said target in said first plane and then in said second plane as said first and second planes rotate;(d) means for measuring the height (RH) of said antenna system; and (e) means for calculating the range and/or elevation of said target in response to θ
, γ
, Δ
T1, Δ
T2 and RH. - View Dependent Claims (2, 3, 4)
-
-
5. A method for detecting the range and/or elevation of a target employing an antenna system having first and second planes of receipt which are inclined a fixed angle (θ
- ) from one another, said antenna system being located along the line of intersection of said planes and said antenna aystem including means for sweeping said line of intersection at a known rate of sweep (γ
), the method comprising the steps of;(a) measuring the delay (Δ
T1) between receipt of a signal directly from said target in said first plane and reflected from a remote surface in said first plane;(b) measuring the delay (Δ
T2) between receipt of a signal from said target first in said first plane and then in said second plane as said first and second planes rotate;(c) measuring the height (RH) of said antenna system; and (d) calculating the range and/or elevation of said target in response to θ
, γ
, Δ
T1, Δ
T2 and RH. - View Dependent Claims (6, 7, 8, 9, 10)
- ) from one another, said antenna system being located along the line of intersection of said planes and said antenna aystem including means for sweeping said line of intersection at a known rate of sweep (γ
Specification
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- Resources
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Current AssigneeThe Boeing Co.
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Original AssigneeThe Boeing Co.
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InventorsCampbell, John M.
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Primary Examiner(s)Blum, Theodore M.
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Assistant Examiner(s)Sotomayor, John B.
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Application NumberUS06/655,704Time in Patent Office977 DaysField of Search343/15 R, 343/450, 343/458, 343/461, 343/12 R, 343/11 VB, 342/123, 342/121, 342/126, 342/133, 342/148, 342/158US Class Current342/458CPC Class CodesG01S 11/04 using angle measurementsG01S 13/003 Bistatic radar systems; Mul...
