Aerospace and Electronic Systems Magazine March 2018 - 39

Wei et al.

Figure 12.

Doppler profile of target range bin.

Figure 11.

RD maps of results. (a) Conventional processing result. (b) SCLP
algorithm result.

under major ionospheric contamination, in which the SDC obscures a wide frequency interval and severely deteriorates the detection performance of low-velocity vessels.
Clutter mitigation methods are the focus of our research. The
proposed SCLP algorithm was tested by the experimental data. The
conventional method, i.e., the two-dimensional fast Fourier transform plus digital beamforming, was performed as a benchmark for
performance comparisons.
The RD maps under the conventional and adaptive clutter suppression method are shown in Figure 11. The horizontal axis is
the Doppler frequency, and the vertical axis is the range cells. The
size of one range cell is 3.75 km. The target was detected from the
sea clutter background, and this result was verified by the GPS
information. Figure 11a shows the RD map of the conventional
processing result, where we can see strong spread clutters. Figure
11b shows the RD map obtained by the SCLP algorithm, in which
the clutter is suppressed and the target is visible. The component in
the circle is the target.
To show the results more clearly, the Doppler spectrum of the
target distance is given in Figure 12. The left peak with a Doppler
of −0.58 Hz is the target. The blue curve is the Doppler profile of
MARCH 2018

Figure 13.

Track of the target.

the conventional method. The red line with dots is the Doppler
profile of the SCLP algorithm. It is clear that the first-order sea
clutter nearby is mitigated. It can be inferred that the target detection probability will be improved after using SCLP.
At each CPI, the target detection is performed by the constant
false alarm rate (CFAR) algorithm, and a target is declared when
a peak in the CFAR output exceeds the selected threshold. A track
in this experiment is shown in Figure 13. In this track, the target is
moving from a radial distance of 69 km to one of 77 km in 66 min.
The direction of arrival of the target is from −7° to 15°.

CONCLUSION
In this article, the principle of HFSSWR is introduced based on an
experimental system of HIT. This radar system is a natural com-

IEEE A&E SYSTEMS MAGAZINE

39



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