Fast acquisition digital tanlock loop with adaptive time delay

In this paper, a novel approach that enhances the locking and acquisition characteristics of the time delay digital tanlock loop is developed. The idea revolves around replacing the single time delay unit with a dual time delay structure. This approach extends the tracking range of the loop and exploits the desired characteristics induced by each time delay on its own. Simulation results of the new structure show that the newly developed loop can offer rapid acquisition and good tracking performance over a wide locking range. Application of the loop to the demodulation of FSK signal is demonstrated