Optical receiver for area location system

Claim 2

An optical location system for locating the position of a moving object in a defined area, comprising: an optical transmitter for attachment to the moving object; a number of optical sensors for receiving a signal from said transmitter, wherein one of said sensors is a full-view sensor having a field of view of all of said defined area; and an opaque template for each of said sensors other than said full view sensor, wherein each of said templates has at least one horizontal or vertical blocking strip for partially blocking the field of view of said sensors other than said full-view sensor, such that each of said sensors other than said full-view sensor is a horizontal or vertical partial view sensor having a field of view of approximately one-half of said defined area, as determined by at least one horizontal or vertical window where said at least one blocking strip does not cover the field of view, and wherein said blocking strips or said windows vary in size and number with respect to each of said horizontal or vertical partial view sensors, such that the detection or non detection of a signal from said transmitter can be used to form a digital code that represents a resolution of said defined area of 2 n where n is the number of said partial view sensors and having not more than n+1 sensors.

Claim 3

The system of claim 1, wherein each said template has alternating blocking strips and windows of equal size, such that for each ith additional partial view sensor, the blocking strips and windows of its template are one-half as wide but twice as many in number as those of the ith-1 sensor, such that said digital code is a binary code.

Claim 4

The system of claim 1, wherein each said template has alternating blocking strips and windows, such that for each ith additional sensor, its template has a window or blocking strip that provides that sensor with a field of that overlaps the field of view of the ith-1 sensor, such that said digital code is a gray code.

Claim 5

The system of claim 1, wherein said templates comprise a set of templates having vertical blocking strips and a set of templates having horizontal blocking strips.

Claim 6

The system of claim 1, wherein said windows are shaped such that each window has a varying width, with wider portions corresponding to the view of closer portions of said area, to compensate for a perspective view of said sensors.

Claim 7

The system of claim 5, wherein said windows are truncated.

Claim 8

The system of claim 5, wherein said windows are shaped to compensate for a perspective view except where said window defines a perimeter of the field of view of said area.

Claim 11

The method of claim 8, wherein said step of partially blocking is performed such that each said template has alternating blocking strips and windows of equal size, such that for each ith additional partial view sensor, the blocking strips and windows of its template are one-half as wide but twice as many in number as those of the ith-1 sensor, such that said digital code is binary code.

Claim 12

The method of claim 8, wherein said step of partially blocking is performed such that each said template has alternating blocking strips and windows, such that for each ith additional sensor, its template has a window or blocking strip that provides that sensor with a field of field that overlaps the field of view of the ith-1 sensor, such that said digital code is gray code.

Claim 13

The method of claim 8, wherein said step of partially blocking is performed by shaping each of said windows with a varying width, with wider portions corresponding to closer portions of said area, to compensate for a perspective view of said area.

Claim 14

The method of claim 1, and further comprising the step of locating a number of said targets and identifying said targets by means of an optical identification code.

Claim 15

An optical receiver for receiving an optical signal from a moving transmitter in a defined area, and generating digital code indicating the location of said transmitter within said area, comprising: a number of optical sensors for receiving a signal from said transmitter, wherein one of said sensors is a full-view sensor having a field of view of all of said defined area; and a template for each of said sensors other than said full view sensor, wherein each of said templates has at least one horizontal or vertical blocking strip for partially blocking the field of view of said sensors other than said full-view sensor, such that each of said sensors other than said full-view sensor is a horizontal or vertical partial view sensor having a field of view of approximately one-half of said defined area, as determined by at least one horizontal or vertical window where said at least one blocking strip does not cover the field of view, and wherein said blocking strips or said windows vary in size and number with respect to each of said horizontal or vertical partial view sensors, such that the detection or non detection of a signal from said transmitter can be used to form a digital code that represents a resolution of said defined area of 2 n where n is the number of said partial view sensors and having not more than n+1 sensors.

Claim 16

An optical receiver for receiving an optical signal from a moving transmitter in a defined area, and generating digital code indicating the location of said transmitter within said area, comprising: a number of optical sensors for receiving a signal from said transmitter, wherein one of said sensors is a full-view sensor having a field of view of all of said defined area; and a template for each of said sensors other than said full view sensor, wherein each of said templates has at least one horizontal or vertical blocking strip for partially blocking the field of view of said sensors other than said full-view sensor, such that each of said sensors other than said full-view sensor is a horizontal or vertical partial view sensor having a field of view of approximately one-half of said defined area, as determined by at least one horizontal or vertical window where said at least one blocking strip does not cover the field of view, and wherein said blocking strips or said windows vary in size and number with respect to each of said horizontal or vertical partial view sensors, such that the detection or non detection of a signal from said transmitter can be used to form a digital code that represents a resolution of said defined area of 2 n where n is the number of said partial view sensors and having not more than n+1 sensors.

Claim 17

The receiver of claim 13, wherein each said template has alternating blocking strips and windows of equal size, such that for each ith additional partial view sensor, the blocking strips and windows of its template are one-half as wide but twice as many in number as those of the ith-1 sensor, such that said digital code is a gray code.

Claim 18

The receiver of claim 13, wherein each said template has alternating blocking strips and windows, such that for each ith additional sensor, its template has a window or blocking strip that provides that sensor with a field of field that overlaps the field of view of the ith-1 sensor, such that said digital code is a gray code.

Claim 19

The receiver of claim 13, wherein said templates comprise a set of templates having vertical blocking strips and a set of templates having horizontal blocking strips.

Claim 20

The receiver of claim 13, wherein said windows are shaped such that each window has a varying width, with wider portions corresponding to the view of closer portions of said area, to compensate for a perspective view of said sensors.

Claim 21

The receiver of claim 17, wherein said windows are truncated.

Claim 22

The receiver of claim 17, wherein said windows are shaped to compensate for a perspective view except where said windows define a perimeter of the field of view of said area.