Browse Prior Art Database

SCANNING LOCATOR SYSTEM

IP.com Disclosure Number: IPCOM000006039D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2001-Nov-28
Document File: 3 page(s) / 123K

Publishing Venue

Motorola

Related People

Henry A. Bogut: AUTHOR [+3]

Abstract

This publication describes a method for tracking and locating individuals within a facility and displaying their location on a suitable display console at a main control location. The display preferably consists of either a numerical display in which the user ID and location ID are displayed with a desk console or on a microprosser controlled CRT console backed by operational and graphical software. This system provides for reception of emergency signals, such as a MAN DOWN alert on the tracked individual. In addition to displaying the Mao Down may be displayed as alert status, an audible alarm can be included.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 50% of the total text.

Page 1 of 3

0 M

MOTOROLA INC. Technical Developments Volume 12 April 1991

SCANNING LOCATOR SYSTEM

by Henry A. Bogut, Anthony J. Dolezal and Jose M. Fernandez

  This publication describes a method for tracking and locating individuals within a facility and displaying their location on a suitable display console at a main control location. The display preferably consists of either a numerical display in which the user ID and location ID are displayed with a desk console or on a microprosser controlled CRT console backed by operational and graphical software. This system provides for reception of emergency signals, such as a MAN DOWN alert on the tracked individual. In addition to displaying the Mao Down may be displayed as alert status, an audible alarm can be included.

The Scanning Locator System consists of these three major elements:

   1. Low power location transmitters which transmit encoded location data on a periodic basis. These low power transmitters can be located in areas of a facility where surveillance is required by authorized individuals equipped with scanning locator two way portable radios.

2. Scanning portable transceivers with unique encode/decode and radio scanning algorithm.

  3. A base station, equipped with a decoder console or CRT display console with unique encode/decode capability to match the system.

  The encode/decode algorithm is based on a modified MDC signaling scheme. The transmit and receive data, which is normally contained in the four digit MDC ID number, is to he used for radio user ID and location ID. The portable radio's MCU, after receiving the code, would separate the four digit ID into two parts; the first hvo digits would identify the radio user and the second two digits would identify the location. (see fig. 1). The location and ID numbers are distinguished by the placement of double zeros ("00") either at the beginning or end. These double zeros flag the MCU that location or ID information has been received. Any other data combinations received arc not processed. Location data always begins with two

0 Motorola. 1°C. Is31

zeros followed by a location designation. As an example, location transmitter number 36 would transmit an MDC signaling packet of "0036". All scanning portable radios used in the system can be identified by an MDC packet with the last two digits always "00". As an example, radio number 24 would have MDC packet of "2400".

  In a typical system, a number of permanently mounted, low power location transmitters would transmit their location data periodically. Al1 location transmitters could he set up to transmit on the same frequency. Physical spacing, shielding techniques,...