Determination of the presence of closely spaced targets
First Claim
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1. A method for detection of remote targets, said method comprising the steps of:
- receiving from a remote target a plurality of one of reflected and transmitted signals containing evidence of target properties, to thereby produce received signals; and
processing said received signals to obtain a prior probability that the received signals contain evidence of the properties of more than one target.
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Abstract
An active or passive sensor observes a region, and generates evidence of the type of target or object viewed. The evidence is processed to determine the prior probability that the object is of a particular type. The prior probability so determined is thresholded to produce an indication of the presence of multiple targets or objects in a range bin, suggestive of shadowing of a target.
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Citations
4 Claims
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1. A method for detection of remote targets, said method comprising the steps of:
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receiving from a remote target a plurality of one of reflected and transmitted signals containing evidence of target properties, to thereby produce received signals; and processing said received signals to obtain a prior probability that the received signals contain evidence of the properties of more than one target. - View Dependent Claims (2)
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3. A method for detection of remote targets, said method comprising the steps of:
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receiving from a remote target a plurality of one of reflected and transmitted signals containing evidence of target properties, to thereby produce received signals; and processing said received signals to obtain a prior probability that the received signals contain evidence of the properties of more than one target; wherein said processing step comprises the steps of; counting the number N1 of occurrences out of N occurrences in which said received signals contain evidence of the properties of a first target; determining the binomial probability bN(N1|a) that evidence E1 of the properties of the first target “
a”
is received N1 times given that target “
a”
is observed, bywhere E2 represents any evidence other than evidence E1; determining the binomial probability bN(N1|b) that evidence E1 of the properties of the first target “
a”
is received given that a second target “
b”
is observed, bywhere the “
second target”
is any target other than the first target;determining the prior probability that target is the first target “
a”
, by determining v1, which represents the actual number of times that the first target “
a”
was observed, bydetermining Gamma (γ
) bydetermining the prior probability p(a) of a first target by - View Dependent Claims (4)
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Specification
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Current AssigneeLockheed Martin Corporation (Martin Marietta Corporation)
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Original AssigneeLockheed Martin Corporation (Martin Marietta Corporation)
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InventorsFriesel, Mark A.
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Primary Examiner(s)Sotomayor; John B.
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Application NumberUS10/886,951Time in Patent Office1,048 DaysField of Search342/13, 342 89-103, 342159-162US Class Current342/13CPC Class CodesG01S 13/66 Radar-tracking systems; Ana...G01S 7/41 using analysis of echo sign...
