Field disturbance monitor system

Details Field disturbance monitor system Field disturbance monitor system

1991-05-20

1992-09-22

Hellner, Mark

Communications: directive radio wave systems and devices (e.g.,

Presence detection only

By motion detection

G01S 942

Patent

active

051501236

ABSTRACT:
A field disturbance monitor system which senses changes in a reflected signal caused by animate objects compared to inanimate objects in the same zone. The system employs a microprocessor which controls the system. A transmitter transmits a pulses microwave signal in response to a control signal from the microprocessor. A receiver receives a return signal which represents a reflection of the transmitted signal. A sample and hold circuit senses and holds the magnitude of the pulsed signal. Analog to digital conversion is obtained, whereby a ramp generator generates a ramp voltage which is compared with the magnitude of the received signal by a comparator. The microprocessor measures the time it takes the ramp voltage to rise to the magnitude of the detected signal. The microprocessor continuously computes a recursive short term average and compares this average value with a recursive long-term average. Deviations between the two time periods are the result of a disturbance within the monitoring field. Furthermore, the system is continuously self-adjusted to allow the conversion process to occur within the bounds of the measurement circuit, by changing the gain applied to the detected signal.

REFERENCES:
patent: 3727721 (1973-04-01), Lee et al.
patent: 3957322 (1976-05-01), Mastronardi et al.
patent: 3957323 (1976-05-01), Tucker et al.
patent: 4033649 (1977-07-01), Naito et al.
patent: 4210912 (1980-07-01), Naidich et al.
patent: 4256355 (1981-03-01), Yamaguchi et al.
patent: 4286260 (1981-08-01), Gershberg et al.
patent: 4307922 (1981-12-01), Rhodes, Jr.
patent: 4412772 (1983-11-01), Naito et al.
patent: 4422816 (1983-12-01), Naito et al.
patent: 4437711 (1984-03-01), Dahnert
patent: 4456911 (1984-06-01), Augustine
patent: 4733923 (1988-03-01), Dahnert
patent: 4744307 (1988-05-01), Peterman et al.
patent: 4745516 (1988-05-01), Griffin
patent: 4783618 (1988-11-01), Artrip
patent: 4970517 (1990-11-01), Williams
Microwave Sensors Product Brochure.

Affiliated with

Also associated with

Rating

Field disturbance monitor system does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1072076