Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1990-05-04
1992-06-02
Gregory, Bernarr E.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342463, 342465, 375 1, 380 34, G01S 302, H04L 2730
Patent
active
051191040
ABSTRACT:
A radiolocation system for multipath environments, such as for tracking objects in a semiconductor fabrication facility (FIGS. 1a-1b), includes an array of receivers (20) distributed within the tracking area, coupled to a system processor (40) over a LAN. A TAG transmitter (30) located with each object transmits, at selected intervals, spread spectrum TAG transmissions including at least a unique TAG ID. In a high resolution embodiment, object location is accomplished by time-of-arrival (TOA) differentiation, with each receiver (FIG. 2b) including a TOA trigger circuit (64) for triggering on arrival of a TAG transmission, and a time base latching circuit (65) for latching the TOA count from an 800 MHz time base counter. In a low resolution embodiment, each receiver of the array is assigned a specific location-area, and receives TAG transmissions almost exclusively from TAGs located in that area, thereby eliminating the need for any time-of-arrival circuitry.
REFERENCES:
patent: 3518674 (1970-06-01), Moorehead et al.
patent: 3646580 (1972-02-01), Fuller et al.
patent: 3714573 (1973-01-01), Grossman
patent: 4897661 (1990-01-01), Hiraiwa
patent: 4914444 (1990-04-01), Pifer et al.
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