It is shown that a triangular perturbation signal provides increased position-detection accuracy over that provided by a sinusoidal perturbation signal [1]. Triangular perturbation is applied to a two-element photosensor receptor, resulting in perfect position detection within the dimensions of the receptor. It is also shown that perfect position detection can be obtained over as large a range as desired by using a many-element zero-deadband one-dimensional receptor subjected to triangular perturbation.

On the Improvement of Position-Detection Accuracy Using Signal Perturbation Theory

The effect of random image perturbation on the measurement of line length and area using discrete photosensitive arrays is presented It is shown that two-dimensional independent Gaussian perturbation can linearize the response of area measurement systems employing arrays with elements of small active area

Area Measurement Using Random Image Perturbation with Discrete Arrays

The optimal solution of perturbation signal waveform used to linearize the nonlinear transfer characteristic of the receptor array for an image sensing is sought through approximation. A completely linearized characteristic is obtained for the one-dimensional square-element receptor array without dead space by introducing this optimal perturbation signal to the system. Therefore, a zero sensing error is achieved. The result is extended to linearize one-dimensional receptor arrays having specific dead space and two-dimensional receptor arrays.

Optimal Perturbation Signal Waveform for Sensing Arrays

A random perturbation about the true position of a target image is shown to improve the position-detection accuracy of systems which operate on quantized data. For a two-sensor receptor the random perturbation is shown to decrease the position error measurably. For a multisensor receptor the random perturbation is shown to drive the position error to zero.

The Effect of Random Perturbation on Position-Detection Accuracy

A position-detection system utilizing a chemical array is described. The array uses a continuous layer of inorganic compound in a resin material as the sensing medium, thus eliminating the element spacings that are the primary cause of error in discrete arrays with inactive gaps. The analysis of a one-dimensional chemical array with mechanical image perturbation is presented. Zero error-position detection is obtained with triangular image perturbation.

Chemical Array as a Position Detector

A method is presented for increasing the accuracy of position and velocity detecting systems which make use of pattern recognition principles. The basic limitation of these systems is due to the binary nature of receptor elements which causes the receptor to have a nonlinear transfer characteristic.

Pi-Fuay Chen

Papers

Improvement of Position and Velocity Detecting Accuracy by Signal Perturbation