Frequency Serrodyning:
G.T.Microwave's Digital Frequency Translators/phase
shifters are used for changing the fundamental
frequency of incoming signals. Frequency Serrodyning
operation is employed by the velocity deception Electronic
Countermeasures jammer to counter those radars utilizing
a target's doppler shift information. The Electronic
Countermeasures jammer will frequency translate an
incoming signal by a desired amount and at a specific
rate during retransmission. If the radar follows the
Electronic Countermeasures signal, it is left without
a target in its velocity gate when the Electronic
Countermeasures signal is turned off. The operation
can be accomplished by a Digital Phase Shifter/
Digital Frequency Translator.
PM/AM Error is the maximum change
from crest-to-crest in insertion loss of the phase
shifter as the phase is rotated over a 360-degree
phase range. The amplitude change (AM) being a function
of the phase change (PM).
PM Error: 0-200 KHz, 1 dB
AM Error: 200-500 KHz, 3 dB
Phase Nonlinearity is the lack of
direct proportionality to the ratio of phase shift
to frequency over a specified frequency range, which
can be calculated through the deviation of the linear
phase shift and time.
Phase Nonlinearity: 5 degrees
Although Quantization Error is insignificant
at a phase resolution greater than 6 BITs, it appears
in a digital phase shifter, which only estimates the
linear phase shift with isolated phase steps.
Flyback Time is the limited time
allocated by the phase shifter to go back from 360
to 0 degrees.
Flyback Time: <1% of the translation rate.
For substantial improvement
in performance; ask for OPTIMIZED NARROWBAND models.
G.T. Microwave Inc. 1-973-361-5700 fax: 1-973-361-5722
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