Serrodyning by Means of a Digital Phase Shifter
Abstract
Serrodyning operation is employed by the velocity deception Electronic Countermeasures jammer to counter those radars utilizing a target's doppler shift information. The jammer will frequency translate an incoming signal by a desired amount and at a specific rate during retransmission. If the radar follows the ECM signal, it is left without a target in its velocity gate when the ECM signal is turned off. The operation can be accomplished by either a TWT (Traveling Wave Tube) or a DPS (Digital Phase Shifter). The purpose of this thesis is to determine the properties of the spectrum of a sinusoidal signal which is phase modulated with a staircase waveform. The investigations include the study of the qualities of the output spectrum and the characteristics of the operation, e.g., number of steps (phase resolution), phase accuracy, switching speed, translation loss and suppression ratio. Results are verified by simulations as well as by measurements. (kr)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1989
- Accession Number
- ADA219593
Entities
People
- Meng-yoon Tan
Organizations
- Naval Postgraduate School