Phase-lock loop models for SYSTID simulations, volume 4

Phase lock loop models were developed for use in SYSTID simulations, and guidelines for parameter selection were given. Two different models, SOPLL1 and SOPLL2, allow for use with and without a hard limiter at the loop input. Several tests were run to validate loop performance. These include transient response tests, phase error variance tests, and signal to noise ratio tests. These last tests utilize the phase lock loop as an FM discriminator, for which the detection gain was determined for a wide range of signal to noise ratios. All tests illustrate that model performance is satisfactory.