Investigation of circular polarization for 76 GHz helicopter collision avoidance radar to improve detection performance of high-voltage power lines

Abstract

To improve the detection conditions of the highvoltage power lines using the 76 GHz low-transmitting power helicopter collision avoidance forward looking millimeter-wave radar, the characteristics of the circular polarization is experimentally investigated. Firstly, the specifications and the operating parameters of developed circular polarized 76 GHz is discussed. Then, the radar receiving module with the W-band low noise amplifier and the low loss waveguide to microstrip line transitions enables 12 dB receiving noise figure. Finally, the ground power line detection test is carried out to compare the circular polarization and vertical polarization, which are commonly used to detect the power lines. The results confirm the almost 10 dB increase of the reflection signal of the power lines.