Resources Contact Us Home
Least mean square (LMS) normalizer for active sonar

Image Number 7 for United States Patent #5349567.

A normalizer based on a Least Mean Square (LMS) adaptive algorithm configured to provide effective normalization when the background noise is locally non-stationary and when the target may be subject to time spread of unknown extent. The LMS algorithm used in the normalizer includes an adaptive filter in both the primary and reference inputs as a means of adapting to variations in both the signal and noise statistics. The LMS algorithm is implemented on the logarithm of the data, so that the difference minimized in the LMS structure drives the ratio of the signal power to noise power to a constant value. The algorithm can be used as a range normalizer by running it over range in each doppler bin, or as a frequency normalizer by operating across doppler in each range bin. By continually adapting to the statistics present in the data, the normalizer more effectively deals with the variations in the noise and signal statistics.

  Recently Added Patents
Complete context search system
Method and device for reducing image color noise
Verifiable service policy implementation for intermediate networking devices
Tap initialization of equalizer based on estimated channel impulse response
System for non-destructive image processing
Resin composition, prepreg, resin sheet, metal-clad laminate, printed wiring board, multilayer printed wiring board and semiconductor device
Sparse data compression
  Randomly Featured Patents
Isoindole derivatives, compositions containing same, preparation thereof and pharmaceutical uses thereof in particular as inhibitors of chaperone protein Hsp90 activities
Printing method and apparatus having multiple raster image processors
Continuous ultraviolet curing system
Lateral shearing interferometer system with masked interference pattern
Nesting arch chiropractic support
Automotive wheel
Methods and apparatus for extraction and tracking of objects from multi-dimensional sequence data
Driving axle assembly
System and method for processing waste material
Polymers prepared by polymerizing alpha, beta-ethylenically unsaturated acids and epoxy compounds