Aerospace and Electronic Systems Magazine March 2018 - 37

Wei et al.

Figure 7.

Picture of the receiving array.

of the target. By doing this, we can obtain the clutter training samples without the existence of target. Afterward, a frequency domain
minimum variance distortionless response filter was designed, using
previously estimated clutter samples, to suppress the SDC in a localized processing region. Given that only data from the target range
cell is employed to train the adaptive filter, the proposed method has
a great potential for the application in the sample starved nonstationary clutter scenario.

every 2 min to provide accurate ground truth of the navigation
route and velocity information.
The experiment was carried out 9 June 2015. Figure 8 shows
an OIS ionogram recorded at 03:21 UT for the transmitting-receiving path.
Figure 8 shows that five ionospheric modes are resolved in the
OIS ionogram. These five modes are the sporadic E (Es); the twohop sporadic E (2Es); the F-layer low-angle ray, or F(l); and the Flayer high-angle rays, which include the ordinary wave, or Fo(h),

EXPERIMENTAL SETTINGS AND RESULTS
EXPERIMENTAL SETTINGS AND
ENVIRONMENTAL CONDITIONS
We have built an experimental HFSSWR system
using the existing skywave transmit station and
surface wave receiving systems. The geometry of
our system is illustrated in Figure 6. The receiver
is located at a ground distance of 780 km from the
transmitter, and the baseline between the transmitting and receiving station is 69° relative to the direction of true north.
Figure 7 shows a photo of the receiving array.
The specification of it was shown in Figure 2. Six
radial ground wires on the base of the array element
were nailed to the beach to increase the conductivity. The display and control computer and receiver
are placed in the room at the center of the antenna
array.
A cooperative ship of 1,000 gross registered
tons was hired as a dedicated test target for the experiment. The GPS logging equipment is updated
MARCH 2018

Figure 8.

Transmitting-receiving OIS ionogram.

IEEE A&E SYSTEMS MAGAZINE

37



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