SAMPLE DATA PHASE LOCKED LOOP FOR ADAPTIVE DOPPLER TRACKER

Abstract

Precise phase acquisition and tracking of a data modulated pulse signal in order to recover the data in a low signal to noise ratio environment is achieved by a sample data phase locked loop that is adaptive, second order, and uses baseband polar coordinate processing. The circuit utilizes an adaptive second order loop where the loop bandwidth can be adjusted by a coherence measurement. This provides wide bandwidths during initial acquisition, medium bandwidths during acquisition/track transition and narrow bandwidth during tracking.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1ALLAN W. ROEDER