For GNSS systems, the gain, phase and group-delay patterns of the receiver antenna have an impact on the pseudoranges, i.e. the apparent distances to the satellites estimated by the receiver. In the presence of multipath, this impact is difficult to assess because multipath and antenna effects are mixed. In this article, these sources of pseudo-range error are analyzed by means of simulations for an aircraft moving at the surface of an airport. For the simulations, we rely on a hybrid statisticaldeterministic GNSS multipath simulator combined with a receiver simulator. Various antenna models are tested, e.g. an ideal isotropic antenna and a realistic antenna mounted on an aircraft, with and without the phase and group-delay patterns.
Capucine Amielh graduated as an Electronics and Telecommunication engineer in 2015 from ENAC (Ecole Nationale de l'Aviation Civile) in Toulouse, France. Since 2016, she is a PhD student in the Signal Processing and Navigation (SIGNAV) research axis of the TELECOM team at the ENAC. She is working on GNSS multipath model for aircraft surface operations.
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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.