DuckCorp Dico

Found one definition

1.                 From German - English Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   Impulsfolgefrequenz /ˌɪmpʊlsfˌɔlɡɛfreːkvˈɛnts/ (IFF /ˈɪf/) <fem, n, sg>
   pulse repetition rate <n>PRR,  /pˌeːˌɛrˈɛɾ/ , pulse recurrence rate <n>, pulse rate <n>, pulse repetition frequency <n>PRF,  /pˌeːˌɛrˈɛf/ , pulse recurrence frequency <n>
      Synonym: Pulsfrequenz