Doppler radar download
The system phase noise in a Doppler weather radar may degrade the spectrum moment estimation quality and the clutter cancellation capability which are important in windshear detection. High resolution windspeed profile measurements are needed to provide reliable detection of hazardous low altitude windshear with an airborne pulse Doppler radar. Unspecified Center.ĬLICK HERE TO GET BOOK Book Analysis and Improved Design Considerations for Airborne Pulse Doppler Radar Signal Processing in the Detection of Hazardous Windshear Description/Summary: From the examination of night data, when a dominant clutter mode away from zero Doppler is present, complex filtering is able to significantly increase clutter rejection over use of a notch filter centered at zero Doppler. Several clutter mode tracking algorithms are considered to estimate the Doppler frequency location of the dominant clutter mode. Use of digital notch filters with complex valued coefficients so that the stopband notch can be located at any Doppler frequency is investigated. Clutter spectra from the NASA Wind Shear Flight Experiments of l991-1992 show that the dominant clutter mode can be located away from zero Doppler, particularly at short ranges dominated by sidelobe returns. With Doppler zero set at the aircraft ground speed, ground clutter rejection filtering is typically accomplished using a high-pass filter with real valued coefficients and a stopband notch centered at zero Doppler. Ground clutter interference is a major problem for airborne pulse Doppler radar operating at low altitudes in a look-down mode. Publisher : Createspace Independent Publishing PlatformĬLICK HERE TO GET BOOK Book Designing Clutter Rejection Filters with Complex Coefficients for Airborne Pulsed Doppler Weather Radar Description/Summary: Author : National Aeronautics and Space Administration (NASA)