Velocity measuring system
First Claim
1. A method for measuring the range and total velocity of a target using a passive electro-optical system oriented along a line of sight (LOS) axis, said system including first and second image acquisition devices positioned along a common baseline perpendicular to said LOS, said method comprising the steps of:
- (a) activating said first image acquisition device at a first instance t1 to capture a target image of a target at location T1 and at a second instance t2 to capture a target image of said target at location T2;
(b) activating said second image acquisition device at said first instance t1 to capture a target image of said target at location T1 and at said second instance t2 to capture a target image of said target at location T2;
(c) calculating ranges from said first image acquisition device to said target at location T1 and location T2;
(d) calculating ranges from said second image acquisition device to said target at location T1 and location T2;
(e) calculating a target displacement vector δ
R by performing the following steps;
(i) defining a triangle A between said first image acquisition device, T1, and T2;
(ii) defining a triangle B between said second image acquisition device, T1 and T2;
(iii) solving triangle A to find δ
RA, a first approximate distance between T1 and T2;
(iv) solving triangle B to find δ
RB, a second approximate distance between T1 and T2; and
(v) averaging δ
RA and δ
RB to find a substantially accurate δ
R using the formula;
δ
R=(δ
RA+δ
RB)/2); and
(f) calculating total target velocity V.
1 Assignment
0 Petitions
Accused Products
Abstract
A passive electro-optical range and total velocity measuring system having first and second cameras positioned along a common baseline. Control systems activate the first and second cameras at a first instance to capture a target image of a target at location T1 and at a second instance to capture a target image of the target at location T2. A range computer calculates ranges from the first camera, the second camera, and a baseline midpoint to a target at location T1 and location T2. An angles computer calculates target displacement. A velocity computer calculates total total target velocity, track velocity, and cross-track velocity. The present invention also includes a method for measuring the range and total velocity of a target using a passive electro-optical system.
22 Citations
4 Claims
-
1. A method for measuring the range and total velocity of a target using a passive electro-optical system oriented along a line of sight (LOS) axis, said system including first and second image acquisition devices positioned along a common baseline perpendicular to said LOS, said method comprising the steps of:
-
(a) activating said first image acquisition device at a first instance t1 to capture a target image of a target at location T1 and at a second instance t2 to capture a target image of said target at location T2;
(b) activating said second image acquisition device at said first instance t1 to capture a target image of said target at location T1 and at said second instance t2 to capture a target image of said target at location T2;
(c) calculating ranges from said first image acquisition device to said target at location T1 and location T2;
(d) calculating ranges from said second image acquisition device to said target at location T1 and location T2;
(e) calculating a target displacement vector δ
R by performing the following steps;
(i) defining a triangle A between said first image acquisition device, T1, and T2;
(ii) defining a triangle B between said second image acquisition device, T1 and T2;
(iii) solving triangle A to find δ
RA, a first approximate distance between T1 and T2;
(iv) solving triangle B to find δ
RB, a second approximate distance between T1 and T2; and
(v) averaging δ
RA and δ
RB to find a substantially accurate δ
R using the formula;
δ
R=(δ
RA+δ
RB)/2); and
(f) calculating total target velocity V. - View Dependent Claims (2, 3, 4)
-
Specification
-
- Resources
-
Current AssigneeLarry C. Hardin
-
Original AssigneeLarry C. Hardin
-
InventorsHardin, Larry C., Nash, Lawrence V.
-
Primary Examiner(s)Hoff, Marc S.
-
Assistant Examiner(s)Barbee, Manuel L
-
Application NumberUS09/348,903Time in Patent Office1,645 DaysField of Search702/96, 702/127, 702/142, 702/143, 702/149, 702/159, 702/158, 356/3, 356/4.01, 356/27, 356/28, 382/106, 382/107, 324/160, 324/165, 340/936, 340/937, 340/942US Class Current702/142CPC Class CodesG01P 3/38 using photographic meansG01P 3/68 using optical means, i.e. u...G01S 11/12 using electromagnetic waves...
