filters," IEEE Trans. Commun., COM-26, No. 1, pp. 179-184, January 1978. [19] I.S. Sokolnikoff and R. M. Redheffer, Mathematics of Physics and Modern Engineering, New York: McGraw-Hill, 1958. [20] "Performance specification for services via the tracking and data relay satel- lite system," S-805-1, Goddard Space Flight Center, Greenbelt, MD, November 1976. [21] K. Wakabayashi, M. Nakagawa, and T. Tsunogae, "Tracking performance of improved delay-locked loop," 1980 NTC Record, pp. 24.3.1-24.3.5, 1980, Houston, TX. [22] R. L. Bogusch, F. W. Guigliano, D. L. Knepp, and A. H. Michelet, "Frequency selective propagation effects on spread-spectrum receiver tracking," Proc. IEEE, vol. 69, No. 7, pp. 787-796, July 1981. C. R. Cahn, D. K. Leimer, C. L. Marsh, F. J. Huntowski, and G. D. La Rue, "Software implementation of a PN spread spectrum receiver to accommodate dynamics," iIEEE Trans. Commun., COM-25, No. 8, pp. 832-840, August 1977. [24] C.R. Cahn, "Improved frequency acquisition of a Costas loop," IEEE Trans. Commun., COM-25, No. 12, pp. 1453-1459, December 1977. [25] H. Meyr, "Nonlinear analysis of correlative tracking systems using renewal process theory," IEEE Trans. Commun., COM-23, No. 2, pp. 192-203, February 1975. [26] H. Meyr, "Delay-lock tracking of stochastic signals," IEEE Trans. Commun., COM-24, No. 3, pp. 331-339, March 1976. [27] W.C. Lindsey and H. Meyr, "Complete statistical description of the phase-error process generated by correlative tracking systems," IEEE Trans. Inform. the- ory, IT-23, No. 2, pp. 194-202, March 1977. [28] F. Mesch et al., "Geschwindigkeitsmessung mit Korrelationsverfahren," Messtechnik, vol. 7, pp. 152-157,1971; also vol. 8, pp. 163-168, 1971. [29] H. Meyr, "Undersuchung Korrelativer Trackingsysteme mit Hilfe der Fokker- Planck Methode," Ph.D. Dissertation, Swiss Federal Institute of Technology, Zurich, Switzerland, 1973. [30] A. Polydoros, "On the synchronization aspects of direct-sequence spread spec- trum systems," Ph.D. Dissertation, Department of Electrical Engineering, Uni