Communications: directive radio wave systems and devices (e.g. – Determining velocity – Combined with determining distance and direction
Reexamination Certificate
2011-04-19
2011-04-19
Tarcza, Thomas H (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining velocity
Combined with determining distance and direction
C342S106000, C342S139000
Reexamination Certificate
active
07928898
ABSTRACT:
In a method for determining the kinematic state of an object by evaluating a sequence of discrete polar measured values of a sensor, the polar measurements rm, αmare converted to Cartesian coordinates and subsequently scaled to Cartesian pseudo-measurements using a scaling factor β calculated as a function of measured range rm. Associated pseudo-measurement error variance matrices are determined, each comprising nominal measurement error variances in the range direction R2mand transversely thereto C2mas a function of the measured range rm. The state of the object is estimated, with an estimated variance {circumflex over (σ)}2crossbeing determined transversely with respect to the range direction in an estimation device, based on the Cartesian pseudo-measurements and the pseudo-measurement error variance matrices. The scaling factor β is chosen such that no systematic error results for a position estimate comprising n>1 measurements; and the nominal pseudo-measurement error variance R2min the range direction is calculated as a function of the nominal pseudo-measurement error variance C2mtransversely thereto or conversely such that the variance {circumflex over (σ)}2crosswhich is estimated after processing of n>1 measurements, transversely with respect to the range direction, on average matches the actual variance {circumflex over (σ)}2crossof the estimated error transversely with respect to the range direction.
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Brainard Timothy A
Crowell & Moring LLP
EADS Deutschland GmbH
Tarcza Thomas H
LandOfFree
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