Weak Target Detection within the Nonhomogeneous Ionospheric Clutter Background of HFSWR Based on STAP

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="382516.fig.004a" src="https://static.hindawi.com/articles/ijap/volume-2013/382516/figures/382516.fig.004a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>Range = 200 km  </td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="382516.fig.004b" src="https://static.hindawi.com/articles/ijap/volume-2013/382516/figures/382516.fig.004b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>Range = 200 km, <svg height="13.0625" id="M17" style="vertical-align:-4.15506pt" version="1.1" viewbox="0 0 16.35 13.0625" width="16.35" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,7.825)"><path d="M559 271q0 -109 -83 -187t-189 -89l-36 -213q-16 -30 -86 -43l-7 9q10 36 53 242q-91 11 -139.5 63.5t-48.5 132.5q0 186 242 271l11 -28q-76 -34 -119.5 -91.5t-43.5 -136.5q0 -66 29 -108.5t77 -55.5q39 205 56 260q21 71 65 111t93 40q50 0 88 -45.5t38 -131.5z
M484 273q0 65 -26.5 99t-52.5 34q-37 0 -53 -75l-59 -298q80 5 135.5 74.5t55.5 165.5z" id="x1D711"></path></g>
<g transform="matrix(.012,-0,0,-.012,9.95,12.862)"><path d="M241 635q53 0 94 -28.5t63.5 -76t33.5 -102.5t11 -116q0 -58 -11 -112.5t-34 -103.5t-63.5 -78.5t-94.5 -29.5t-95 28t-64.5 75t-34.5 102.5t-11 118.5q0 58 11.5 112.5t34.5 103t64.5 78t95.5 29.5zM238 602q-32 0 -55.5 -25t-35.5 -68t-17.5 -91t-5.5 -105
q0 -76 10 -138.5t37 -107.5t69 -45q32 0 55.5 25t35.5 68.5t17.5 91.5t5.5 105t-5.5 105.5t-18 92t-36 68t-56.5 24.5z" id="x30"></path></g>
</svg> = −10°</td></tr></table></td></tr></table>

<table>Correlation coefficients with different Doppler shift intervals.</table>

International Journal of Antennas and Propagation

fig4

Figure 4

Figure 4: Weak Target Detection within the Nonhomogeneous Ionospheric Clutter Background of HFSWR Based on STAP 