Personal alarm location system and method

Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

342457, 342463, 340502, G01S 302

Patent

active

056614926

ABSTRACT:
A population of locatable personal detection units (PDUs) (20) are worn by users. Any number of locators (14) are placed at known locations within an area (10) where the users tend to be. When an alarm event for an individual user occurs, a request signal is transmitted from the user's PDU (20). The request signal is received at several of the locators (14), each of which measure the power level of the request signal. A central computer (16) selects some of these locators (14) in response to the power level measurements. In sequence, the selected locators (14) transmit an interrogation signal to the PDU (20), the PDU (20) replies to the interrogation signal, and the locators (14) measure the duration transpiring between the interrogation and the reply. Based on the durations measured for at least three of the locators, the central computer (16) uses a multilateration process to localize the PDU (20).

REFERENCES:
patent: 4176254 (1979-11-01), Tuttle et al.
patent: 4222052 (1980-09-01), Dunn
patent: 4494119 (1985-01-01), Wimbush
patent: 4510350 (1985-04-01), Wagner
patent: 4524243 (1985-06-01), Shapiro
patent: 4596988 (1986-06-01), Wanka
patent: 4698781 (1987-10-01), Cockerell
patent: 4908629 (1990-03-01), Apsell et al.
patent: 5055851 (1991-10-01), Sheffer
patent: 5075671 (1991-12-01), Livingston, III
patent: 5208756 (1993-05-01), Song
patent: 5309144 (1994-05-01), Lacombe et al.
patent: 5311197 (1994-05-01), Sorden et al.
An article entitled "Implementation of GEOSTAR.RTM. RDSS Spectrum Receiver" by Masoud Motamedi & Robert D. Briskman from Geostar Corporation, IEEE, 1987.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Personal alarm location system and method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Personal alarm location system and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Personal alarm location system and method will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1991281

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.