Table 1: Theoretical calculation of relative error in various combinations of installation angle and vertical beamwidth.

θβ
4°6°8°10°12°14°16°18°

20°−1.3%~1.2%−2.0%~1.8%−2.8%~2.3%−3.6%~2.8%−4.4%~3.3%−5.2%~3.7%−6.0%~4.1%−6.9%~4.5%
22.5°−1.5%~1.4%−2.3%~2.0%−3.1%~2.6%−4.0%~3.2%−4.9%~3.8%−5.8%~4.3%−6.7%~4.8%−7.7%~5.2%
25°−1.7%~1.6%−2.6%~2.3%−3.5%~3.0%−4.4%~3.7%−5.4%~4.3%−6.4%~4.9%−7.5%~5.5%−8.5%~6.1%
30°−2.1%~2.0%−3.0%~2.9%−4.3%~3.8%−5.4%~4.7%−6.6%~5.5%−7.8%~6.3%−9.0%~7.1%−10.3%~7.8%