ISO/TC 211 Multi-Lingual Glossary of Terms (MLGT)

Note 1 to entry: The integrated side lobe ratio (ISLR) can be obtained by integrating the power of the impulse response over suitable regions. The ISLR is expressed as ${\displaystyle \text{ISLR}=10{\log }_{10}^{}\left\{\frac{P_{\text{total}}-P_{\text{main}}}{P_{\text{main}}}\right\}}$ where ${\displaystyle P_{\text{total}}}$ is the total power, ${\displaystyle P_{\text{main}}}$ is the main lobe power.

Note 2 to entry: The main lobe width can be taken as α times the impulse response width (IRW), centred around the peak, where α is a predefined constant, usually between 2 and 2,5.