Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Patent
1998-10-01
2000-08-22
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Echo systems
Returned signal used for control
367910, G01S 1588
Patent
active
061082694
ABSTRACT:
A sonar depth sounder device and method for processing echo signals, reflected from objects within a body of water, utilizes a processor, a memory, a display, and a keypad connected to the processor. The receiver receives sonar signals indicative of ambient noise in an underwater environment. The processor receives an electrical signal representative of the ambient noise, and calculates a detection threshold. The detection threshold is calculated by multiplying a scaling factor times the variance of the signal indicative of the ambient noise, and adding that product to the mean of the signal indicative of the ambient noise in the underwater environment. A transmitter then excites a transducer which emits sonar pulses into a body of water, and a receiver receives reflected sonar echo signals. When the intensity of the reflected sonar echo signals is less than the detection threshold, the reflected echo signals are eliminated from processing. When, however, the amplitude of a reflected sonar signal is greater than the detection threshold, the processor causes data indicative of the reflected sonar signal to be displayed on the display. Further, the detection threshold is increased from its starting point over time to compensate for increasing a gain in the receiver of the sonar depth sounder device. Additionally, the detection threshold is periodically updated to compensate for changes in ambient noise in the underwater environment.
REFERENCES:
patent: 3893061 (1975-07-01), Slawsky et al.
patent: 4700332 (1987-10-01), Hwang
patent: 4777630 (1988-10-01), Burns
patent: 5260912 (1993-11-01), Latham
patent: 5459479 (1995-10-01), Cummings
Garmin Corporation
Lobo Ian J.
LandOfFree
Method for elimination of passive noise interference in sonar does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for elimination of passive noise interference in sonar, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for elimination of passive noise interference in sonar will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-588787