A method and apparatus are disclosed for detecting, in a plurality of stages of a matched filter, a binary convoluted coded signal having a plurality of code levels ranging from a low level, high repetition rate code to a high level, low repetition rate code, in which each filter stage of the matched...http://www.google.com/patents/US4633426?utm_source=gb-gplus-sharePatent US4633426 - Method and apparatus for detecting a binary convoluted coded signal
