Echo signal sequence <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle r\left(n\right)=\alpha x\left(n-D\right)+g\left(n\right)}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mi>r</mi><mrow><mo>(</mo><mi>n</mi><mo>)</mo></mrow><mo>=</mo><mi>α<!-- α --></mi><mi>x</mi><mrow><mo>(</mo><mrow><mi>n</mi><mo>−<!-- − --></mo><mi>D</mi></mrow><mo>)</mo></mrow><mo>+</mo><mi>g</mi><mrow><mo>(</mo><mi>n</mi><mo>)</mo></mrow></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle r\left(n\right)=\alpha x\left(n-D\right)+g\left(n\right)}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/52bb437fef26e9b51cabe3ecf53719eef0b6fa6d" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -0.838ex; width:26.459ex; height:2.843ex;" alt="{\displaystyle r\left(n\right)=\alpha x\left(n-D\right)+g\left(n\right)}"></span> of a radar signal.
<a href="//commons.wikimedia.org/wiki/User:Luca_Ghio" title="User:Luca Ghio">Luca Ghio</a>
<span class="int-own-work" lang="en">Own work</span>