Aerospace and Electronic Systems Magazine December 2017 - 35

McKerracher, Moo, and Ponsford

Figure 6.

Example of traditional impulsive noise
cancellation techniques. Impulsive noise
observed between pulse 310 and 370. Corrupted data is either simply blanked by setting values to zero or values predicted.

lope of the signal plus interference must be
larger than typical in order to detect within
the time segment. A typical example is
shown in Figure 6.
Radar systems in the HF band operate in an environment of high clutter and
therefore have a large signal envelope in
the time domain. Targets of interest may
be present in the portion of the frequency
(Doppler) domain that is well removed
from the clutter, thus are noise floor limited. The effective signal to noise ratio of
these targets may be adversely affected
in this situation. Figure 7 and Figure 8
demonstrate an example where the time
domain envelope is largely unaffected by
the low level impulse event however the
frequency domain noise floor is elevated
by 20 dB, resulting in a significant loss in
signal-to-noise ratio (SNR).
The developed approach uses the
wideband data as observed on the Spectrum Management system to identify
pulses that are corrupted by impulse
noise. The impulse event is significantly
easier to detect in the wideband frequency domain rather than the time domain.
The noise floor increase in the wide band
frequency domain from a short duration
impulse is shown in Figure 9.
The wideband data collection and
the narrowband target processing are
time aligned. Thus, a corrupted sweep
in the wideband data can be correlated
to a specific pulse sequence in the narrowband target data channel. The identified pulse(s) in the narrowband channel
can be replaced by zero padding or with
interpolated data obtained from adjacent
DECEMBER 2017

Figure 7.

Pulse envelope (time domain) with low amplitude impulse event.

Figure 8.

Frequency domain of signal. Low amplitude impulse resulted in nearly 20 dB increase in noise floor.

Figure 9.

Wideband noise floor elevation due to impulsive noise events.

IEEE A&E SYSTEMS MAGAZINE

33



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