00789nas a2200181   4500000000100000000000100001008004100002260000900043653003100052653002200083653002200105100002000127700002300147245005500170300001000225490000600235520036600241       1999                            d  c199910aadaptive Doppler filtering10alinear prediction10aspectral analysis1 aEmil Semerdjiev1 aTzvetan Semerdjiev00aBulgarian MSDF R&D National Program and Activities  a71-810 v23 a<p>A brief historical view and consideration of Bulgarian strategy and achievements in the field of MSDF is presented in the paper. Current R&amp;D projects are briefly described. We examine the opportunity for joint research and the strengthening of the connections with the international MSDF science community as a promising area of fruitful cooperation.</p>