Attenuation of unwanted signals from a moving interferer
نویسندگان
چکیده
In this memo we present a study of the attenuation of the radio frequency interference provided by the SKA core in the case of moving interferer (e.g. an aircraft). Identical simulations were carried out for both the Large N (a number of antennae) – Small D (diameter of antennae) and the Small N – Large D designs. The former design provides only a few dB greater attenuation. The attenuation of the signal of a moving interferer (for a short duration and reasonable correlator averaging times and interferer’s speeds) is up to 10 dB better than in the stationary case, but depends on the direction of the motion. Therefore, we recommend using the figures for the stationary case for design and site selection purposes.
منابع مشابه
Attenuation of spatial aliasing in CMP domain by non-linear interpolation of seismic data along local slopes
Spatial aliasing is an unwanted side effect that produces artifacts during seismic data processing, imaging and interpolation. It is often caused by insufficient spatial sampling of seismic data and often happens in CMP (Common Mid-Point) gather. To tackle this artifact, several techniques have been developed in time-space domain as well as frequency domain such as frequency-wavenumber, frequen...
متن کاملAn investigation of model selection criteria for technical analysis of moving average
Moving averages are one of the most popular and easy-to-use tools available to a technical analyst, and they also form the building blocks for many other technical indicators and overlays. Building a moving average (MA) model needs determining four factors of (1) approach of issuing signals, (2) technique of calculating MA, (3) length of MA, and (4) band. After a literature re...
متن کاملPlanar arrays and spatial filtering in ambient noise interferometry
Theoretically, the empirical Green’s function between a pair of receivers can be extracted from the crosscorrelation of the received diffuse noise. The diffuse noise condition rarely is met in the ocean and directional sources may bias the Green’s function. Here matrix-based spatial filters are used for removing unwanted contributions in the crosscorrelations. Two methods are used for solving t...
متن کاملApplication of Single-Frequency Time-Space Filtering Technique for Seismic Ground Roll and Random Noise Attenuation
Time-frequency filtering is an acceptable technique for attenuating noise in 2-D (time-space) and 3-D (time-space-space) reflection seismic data. The common approach for this purpose is transforming each seismic signal from 1-D time domain to a 2-D time-frequency domain and then denoising the signal by a designed filter and finally transforming back the filtered signal to original time domain. ...
متن کاملSpatial filtering in ambient noise interferometry.
Theoretically, the empirical Green's function between a pair of receivers can be extracted from the cross correlation of the received diffuse noise. The diffuse noise condition rarely is met in the ocean and directional sources may bias the Green's function. Here matrix-based spatial filters are used for removing unwanted contributions in the cross correlations. Two methods are used for solving...
متن کامل