A tracking filter (10,80) which transitions from a type 2 loop to a type 1 loop as the loop error approaches 0 for fast settling and convergence without overshoot or ringing. The filter can either be implemented as an analog circuit (10) in hardware or digitally (80) in software. A first integrator (30) or first accumulator (82) is utilized to increment or decrement a discriminator (22,96) output error value as long as the sign of its output (32) from the previous iteration is the same as a sign...

Tracking apparatus for use in tracking an object (4), which tracking apparatus comprises identification tag (2) which is for being attached to the object (4) and which comprises at least two colors (6,8) and a boundary (12) therebetween; a filter for filtering out colors except those colors on the identification tag (2); and a detector for detecting the boundary (12) on the identification tag (2) and thereby enabling the detected colors on the identification tag (2) to be identified from backgro...

A tracking device includes a motor, top and bottom propellers of opposite sense attached to the stator and rotor of the motor for rotation in opposite directions. Target sensors are provided on the propellers and signals from the target sensors are supplied to a controller that controls the rotation of the motor and the propellers. The tracking device also includes a power supply for the motor and the controller.

A method of detecting designated products from a number of sources includes the step of applying (12) a unique code to each one of a plurality of products at a first location (14). The method also includes determining which of the plurality of products become designated. The method further includes the steps of recording the codes of the designated products, reading (26) the codes of products distributed at a second location (16) and comparing (28) the read codes with the recorded codes to deter...

A tracking system includes a target unit having a GPS receiver, a signal transmitter to send a signal including a position of the target unit; and a processor to calculate an optimal time interval for transmission of the signal. A locating unit has a GPS signal receiver, a compass to provide a reference direction of the locating unit, a signal receiver to receive the signal sent by the transmitter of the target unit, a processor to calculate a range and bearing from the locating unit to the targ...

A tracking device includes an external member and an internal member rotatable relative to the external member. A motor is attached to the internal member and includes a rotor shaft attached to the external member. A pair of target sensors that sense a phenomenon such as a magnetic field, sound, light or RF radiation, provide input to a controller that controls rotation of the motor. Angular acceleration of the internal member will cause an equal and opposite angular acceleration of the external...

Inertial trackers have been successfully applied to a wide range of head mounted display (HMD) applications including virtual environment training, VR gaming and even fixed-base vehicle simulation, in which they have gained widespread acceptance due to their superior resolution and low latency. Until now, inertial trackers have not been used in applications which require tracking motion relative to a moving platform, such as motion-base simulators, virtual environment trainers deployed on board ...

Systems and techniques for tracking a graphical user interface toolbar by establishing a connection to a client; receiving a token including a unique tracking number corresponding to a toolbar item function from the client; and registering use of the toolbar item function.

An apparatus that appears to actively track the position of a viewer by producing a red circle about the viewer's image, seen in a security mirror. The red circle appears to translate and rotate to track the viewer's position. Rotational tracking operates independently of the mirror.

The invention addresses resolution of serious deficiencies in the timing and movement of racing animals at racetracks and other locations. These needs are met by utilizing, refining, and applying modern computer satellite and tracking technology to an antiquated industry. The technology to be utilized includes adaptations of computer chips currently in domestic pet location use, global positioning satellite technology and on board transponders and uses modern communication technologies to centra...