Algorithm of Direction Finding for Broadband Digital Signal
Yingnan Zhang · Nanjing Hangkong Hangtian Daxue xuebao · 2005
Direction finding is an important research subject in the electronic reconnaissance field. This paper presents an algorithm for direction finding of the digital signal based on the multi-baseline system and analyzes the principle of digital phase distinguishing. The algorithm for phase distinguishing of broadband (LFM,BPSK,QPSK) digital signal and resolving phase ambiguity is studied. The broadband signal can be transformed into normal (sine or cosine) signal by corresponding nonlinear transformation. The direction of the broadband signal can be deduced from its phase estimated by the corresponding normal signal. A high accuracy result of direction finding can be obtained under the condition of low signal-noise ratio.