THE EFFECT OF FREQUENCY DISTORTIONS ON THE CHARACTERISTICS OF THE DISCRIMINATORS OF CIRCUITS FOR TRACKING THE DELAY OF PHASE-SHIFT KEYED SPREAD-SPECTRUM SIGNALS

When receiving complex signals frequency distortions can occur (for ex ample, due to the use of techniques to provide protection from narrow- band interference), which lead to distortion of the discriminator char acteristics in the synchronization devices. This is due to the fact th at the discriminator operating algorithms are based on calculating a c ertain analog of the derivative of the correlation integral with respe ct to the tracked parameter, while the correlation properties of the s ignal, as is well known, are closely connected to its Spectral density . Hence, to find the statistical characteristics of the synchronizatio n devices when frequency distortions and noise are present, be it the characteristics of the steady operation (the tracking accuracy) or tra nsients (the probability of a break in the synchronization or the lock ing time), and also when designing synchronization devices for operati on under these conditions, one needs to know the characteristics of th e discriminators of the synchronization devices. In this paper we solv e this problem for the discriminators employed in circuits for trackin g the delay of a phase-shift keyed spread-spectrum signal, which is a widely used form of complex signal.