In the following paper we will receive a short introduction of the softwer defined radio (SDR) technology which
could be used in the radar systems too. First we will see the roots of this technology, where does it come from
and what is the basic idea behind that. Second a short modelling of the digital radio device based on the SDR
technology will be presented and following on that the different kind of implementation level will be introduced.
This simple model will be devided on the three main parts of the SDR based implementation such as analog
front-end processing, domain conversion and digital signal processing. Following on that the software
communication architecture operationg environment will be introduced. Later some related work in RTO and
future trends will be described.