Stationary Time Statistical Property of Ionospheric Clutter in High-Frequency Surface-Wave Radar

<div>Illustration of ionospheric clutter nearly static time. (a) Nearly static time of <span class="nowrap"><svg height="12.0497pt" id="M74" style="vertical-align:-3.3094pt" version="1.1" viewbox="-0.0498162 -8.7403 18.9547 12.0497" width="18.9547pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M702 650H468V614C550 604 550 590 527 521C500 434 457 318 402 172H399C363 266 284 469 255 549C240 592 240 603 313 614V650H15V614C77 608 93 594 124 517C165 413 259 172 327 -11H377C455 195 546 422 579 500C619 595 637 607 702 614V650Z"></path></g><g transform="matrix(.0091,0,0,-0.0091,9.243,3.132)"><path d="M303 0V28C221 34 213 39 213 125V525C213 610 221 616 303 622V650H38V622C120 616 128 610 128 525V125C128 40 120 34 38 28V0H303Z"></path></g><g transform="matrix(.0091,0,0,-0.0091,12.236,3.132)"><path d="M614 175C564 76 510 21 408 21C256 21 146 149 146 336C146 488 235 629 402 629C510 629 570 586 597 480L626 488C620 541 614 582 606 638C578 643 510 665 429 665C206 665 44 527 44 316C44 157 153 -15 402 -15C474 -15 558 5 586 11C604 45 629 119 643 165L614 175Z"></path></g></svg>.</span> (b) Nearly static time of <span class="nowrap"><svg height="12.0497pt" id="M75" style="vertical-align:-3.3094pt" version="1.1" viewbox="-0.0498162 -8.7403 17.4932 12.0497" width="17.4932pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M42 650V615C112 608 121 601 121 516V133C121 48 112 41 37 34V0H347V34C262 41 253 48 253 133V271L321 254C332 254 347 254 362 256C468 269 567 330 567 464C567 529 540 579 493 611C453 639 397 650 318 650H42ZM253 570C253 585 255 595 262 601C268 606 280 611 299 611C360 611 423 574 423 461C423 326 343 300 307 300C286 300 265 305 253 310V570Z"></path></g><g transform="matrix(.0091,0,0,-0.0091,7.787,3.132)"><path d="M303 0V28C221 34 213 39 213 125V525C213 610 221 616 303 622V650H38V622C120 616 128 610 128 525V125C128 40 120 34 38 28V0H303Z"></path></g><g transform="matrix(.0091,0,0,-0.0091,10.78,3.132)"><path d="M614 175C564 76 510 21 408 21C256 21 146 149 146 336C146 488 235 629 402 629C510 629 570 586 597 480L626 488C620 541 614 582 606 638C578 643 510 665 429 665C206 665 44 527 44 316C44 157 153 -15 402 -15C474 -15 558 5 586 11C604 45 629 119 643 165L614 175Z"></path></g></svg>.</span></div>

Journal of Electrical and Computer Engineering

fig4

Figure 4

Figure 4: Stationary Time Statistical Property of Ionospheric Clutter in High-Frequency Surface-Wave Radar 