An automated interference analysis model for modern radar systems
The Radar Receiver System Model (RRSM), an automated model for performing an electromagnetic compatibility (EMC) analysis on the signal processing of modern search radars, is described. The discussion includes the modeling approach, a description of the model, an analysis of a radar receiver in the presence of pulsed undesired signals, and an example of the application of model results to performing an EMC analysis on a selected airborne radar system. RRSM, a full-screen user-interactive computer program, is designed to enable the analyst to study the effects of the intermediate-frequency (IF) filter and signal processing on an interfering signal. >
A mapping approach to impedance extrapolation is presented in this paper. With the assumption of small reflection coefficients, it is derived that there exists an approximately linear mapping relationship between logarithmic impedances and seismic traces. Such a mapping can be realized by applying adaptive filtering. The test result of field data is given. It is shown that the derived impedance or interval velocity profiles bear higher resolution and better well logs correlation than those derived from the conventional method. It turns out to be a kind of supplementary means to inversion technique in production seismology. At last the limitation of the mapping approach is discussed.