DADF (Digital Automatic Direction Finder)

A Doppler Radio-Direction Finder

adio-direction finding has gained a lot of interest in recent years especially on the VHF and UHF bands. There are many different approaches to determining the origin of a radio transmission. Each approach has its advantages and disadvantages. An experienced RDFer learns to make use of several methods to master the art. Directional antennas with good front-to-back ratios (such as a Yagi or quad...

Digital HF/VHF/UHF Scanning Direction Finder R&S DDF 0xA

Automatic Keyword Extraction for News Finder

Newspapers are one of the most challenging domains for information retrieval systems: new articles appear everyday written in different languages, with multimedia contents and the news repositories may be updated in a matter of hours so information extraction is crucial to the metadata contents of the news. Further approaches of “smart retrieval” have to cope with multimedia and multilingual fe...

An objective and automatic cluster finder

We describe an objective and automated technique for detecting clusters of galaxies. This technique is based on the matched-filter technique, using position and apparent magnitude of galaxies simultaneously. Redshift and richness of clusters are estimated as byproducts of detection. We examine accuracies in the estimation of cluster position, redshift, and richness by Monte-Carlo simulations. F...

A formula finder for the automatic synthesis of translation algorithms

A system of procedures and computer programs is proposed for the semi-automatic synthesis of Russian-English translation algorithms. For the purposes of automatic formula finding, a large corpus of Russian scientific and technical text may be processed by an automatic Russian-English dictionary, the resulting word-by-word translation postedited according to a systematic procedure, and the final...