Solid Photography, Inc.

Northrop Grumman Systems Corporation

Robotic Vision Systems, Inc.

Paul E Rademacher

Paul C DiMatteo

Howard K Stern

Robert Segnini

Paul L Di Matteo

A cell averaging (CA) constant false alarm rate (CFAR) device for use in a radar system which filters noise and clutter from a signal containing a plurality of range cells. A moving window average calculator (MWAC) calculates a moving window average (MWA) for each range cell in a signal. A central processing unit (CPU) estimates a skew factor of a probability density function (PDF) and calculates an offset factor based on information contained in the signal. A multiplying device multiplies the offset factor by the MWA calculated for each range cell and creates a second signal containing a plurality of range cells. A comparator compares each range cell of the second signal to each corresponding range cell of the original signal, selects a the larger value of the two signals, and creates a third signal which is essentially free of noise and clutter.

Radar system using a cell averaging constant false alarm rate device

A radar system for identifying an object of interest. A transmitter produces a first signal and a duplexer receives the first signal from the transmitter. An antenna transmits the first signal into the atmosphere and receives a second signal reflected by objects present in the atmosphere. A receiver samples the second signal and develops a third signal. A clutter filter removes a clutter component from the third signal at all frequencies and develops a fourth signal which is free from clutter. An electromagnetic interference (EMI) detection unit identifies EMI present in the fourth signal produced and develops a fifth signal which is free from EMI. A logic device compares the fourth and fifth signals to produce a sixth signal which is free from both clutter and EMI and represents only objects of interest. A display unit receives and displays the sixth signal to allow an operator to track objects of interest.

Pulse doppler radar system which identifies and removes electromagnetic

Leak detector arrangement for the detection of small openings in car bodies or other enclosures or containers which may permit undesired passage of water, fumes, or other fluids in which phase coded or linearly frequency modulated sound waves are directed towards potential leak areas. The portion of these waves which pass through the leak openings is received, and these signals are processed so as to discriminate these leak signals from other sound waves normally entering the receiver from other parts or from other sources. The discriminated signals are compared with a threshold so as to determine the absence or presence of a leak.

Acoustic leak-detection system

The invention discloses a method of determining the position and orientation of an element (such as a platform) in space by determining the intersection of a line with a plane (or with another line). Three different implementations are disclosed.

Method of sensing the position and orientation of elements in space

An arrangement for obtaining three-dimensional position data on surfaces defining a room, and objects enclosed by that room. The room is scanned with a master and slave sensors to determine the three-dimensional profiles of surfaces that are visible to the sensors. A pattern is then projected by the master sensor onto a known surface, and slave sensors spaced from the master sensor search for that pattern. The position of the pattern is determined angularly by each slave sensor, and the projection of the pattern is thereafter discontinued. Each salve sensor then measures the distance to the known surface at that angle with respect to its own coordinate system. This is repeated three times so that three such patterns are located. The position data from all of the sensors are transformed into a single common coordinate system, based upon sensor locations determined by the measurement of the three patterns.

Room scanning system using multiple camera and projector sensors

An arrangement for removing excess material from an object surface, to provide a desired finished surface. Holes are drilled into the object so that the bottoms of the holes lie on the desired finished surface. The holes have a shape so that the observed hole diameter at the prevailing surface of the object is dependent on the hole depth and thereby dependent on the amount of material remaining to be removed between the prevailing surface and the desired finished surface. The prevailing surface is continuously observed and measured, and the depths of material to be removed in a sequence of steps is calculated dependent on the measurements of the prevailing surface and the coordinates of the desired finished surface. As a result of the calculations, the depth of material removed during each step is controlled, so that upon carrying out a sequence of such steps, the surface exposed on the object after the last step has been carried out, coincides with the desired finished surface. The accuracy of the material removal equipment may be substantially less than the accuracy of the finished surface. Grooves instead of circular holes are cut when the radius of curvature of both the prevailing and desired surfaces becomes sufficiently small, so as to provide sufficient definition of the desired surface. With the grooves, the observed parameter is groove width rather than hole diameter.

Gauging system for sculptured surfaces

An arrangement for removing excess material from an object surface, to provide a desired finished surface. Holes are drilled into the object so that the bottoms of the holes lie on the desired finished surface. The holes have a shape so that the observed hole diameter at the prevailing surface of the object is dependent on the hole depth and thereby dependent on the amount of material remaining to be removed between the prevailing surface and the desired finished surface. The prevailing surface is continuously observed and measured, and the depths of material to be removed in a sequence of steps is calculated dependent on the measurements of the prevailing surface and the coordinates of the desired finished surface. As a result of the calculations, the depth of material removed during each step is controlled, so that upon carrying out a sequence of such steps, the surface exposed on the object after the last step has been carried out, coincides with the desired finished surface. The accuracy of the material removal equipment may be substantially less than the accuracy of the finished surface.

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Setauket, NY, United States of America

Paul E Rademacher