JED - November 2013 - 46

E W101

Transmitted
frequency

Distance + Doppler
during this time
FM CW
RADAR
Received
Frequency
Difference
frequency
Round trip
travel time

Round trip
travel time

Doppler measured
during this time

Figure 5: A frequency modulation on a CW radar allows determination of the range to the target by comparing
the frequency of the transmitted and received signals.

CW SIGNALS
A DRFM continuously records the Continuous Wave (CW)
signal, converting it to sequential digital data that is then
stored in digital memory. This stored data is then replayed
out and converted back to an analog signal after a delay, as
long as the CW signal is present. To determine the range to its
target, a CW radar must place a frequency modulation (FM)

on its signal as shown in
Figure 5. Many FM waveforms can be used.  With
the FM modulation waveform shown, the first part
of the waveform holds constant frequency to allow
radial velocity determination. The second part allows
the range to be determined
by comparing the transmitted and received signal frequencies (with the Doppler
shift removed). As the DRFM
records the CW signal, any
frequency modulation is
also recorded and subsequently replayed. By mixing in additional frequency
modulation, the DRFM can
simulate any desired target
velocity (i.e., Doppler shift).

What's Next
Next month, we will continue our discussion of DRFMs, dealing with other DRFM functions and related timing issues. For
your comments and suggestions, Dave Adamy can be reached
at dave@lynxpub.com. a

The Journal of Electronic Defense | November 2013

46

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JED - November 2013

Table of Contents for the Digital Edition of JED - November 2013

The View From Here
Conferences Calendar
Courses Calendar
From the President
The Monitor
World Report
What’s New in Naval ESM
Technology Survey: COMINT/DF Receivers
EW 101
AOC News
Index of Advertisers
JED Quick Look
JED - November 2013 - cover1
JED - November 2013 - cover2
JED - November 2013 - 3
JED - November 2013 - 4
JED - November 2013 - 5
JED - November 2013 - The View From Here
JED - November 2013 - 7
JED - November 2013 - Conferences Calendar
JED - November 2013 - 9
JED - November 2013 - Courses Calendar
JED - November 2013 - 11
JED - November 2013 - From the President
JED - November 2013 - 13
JED - November 2013 - 14
JED - November 2013 - The Monitor
JED - November 2013 - 16
JED - November 2013 - 17
JED - November 2013 - 18
JED - November 2013 - 19
JED - November 2013 - 20
JED - November 2013 - 21
JED - November 2013 - World Report
JED - November 2013 - 23
JED - November 2013 - What’s New in Naval ESM
JED - November 2013 - 25
JED - November 2013 - 26
JED - November 2013 - 27
JED - November 2013 - 28
JED - November 2013 - 29
JED - November 2013 - 30
JED - November 2013 - Technology Survey: COMINT/DF Receivers
JED - November 2013 - 32
JED - November 2013 - 33
JED - November 2013 - 34
JED - November 2013 - 35
JED - November 2013 - 36
JED - November 2013 - 37
JED - November 2013 - 38
JED - November 2013 - 39
JED - November 2013 - 40
JED - November 2013 - 41
JED - November 2013 - 42
JED - November 2013 - 43
JED - November 2013 - EW 101
JED - November 2013 - 45
JED - November 2013 - 46
JED - November 2013 - AOC News
JED - November 2013 - 48
JED - November 2013 - Index of Advertisers
JED - November 2013 - JED Quick Look
JED - November 2013 - cover3
JED - November 2013 - cover4
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