Rain Rate Attenuation Research Articles

Data transfer from satellite to ground station emulator

“Data transfer from satellite to ground station emulator” application has been developed for modelling data transfer between a small spacecraft at low-earth orbit and a control center on Earth. The application takes into account multiple parameters allowing to replace a number of experiments. Additionally, the SGP4 model and models such of parameters such as bit error rate and rain rate attenuation are studied and used in development of the application. Finally, the use cases for the application in education and introduction of school and university students to space-themed projects are considered.

Estimation of signal attenuation in the 60 GHZ band with an analog BiCMOS passive filter

Prediction of millimeter(mm)-wave radio signals can be beneficial in recreating and repeating atmospheric conditions in a controlled, laboratory environment. A path-loss model has been proposed that accounts for free-space losses, oxygen absorption, reflection and diffraction losses, and rain-rate attenuation at mm-wave frequencies. Two variable passive low-pass-integrated circuit filter structures for attenuation in the 57–64 GHz unlicensed frequency band have been proposed, designed, simulated, prototyped in a 130-nm SiGe bipolar complementary metal-oxide semiconductor process, and measured. The filters are based on the Butterworth and Chebyshev low-pass filter topologies and investigate the possibility of using the structures to perform amplitude attenuation of mm-wave frequencies over a short distance. Both filters are designed and matched for direct coupling with equivalent circuit models of dipole antennas operating in this frequency band. Full integration therefore allows prediction of atmospheric losses on an analog, real-time, basis without the requirement of down-converting (sampling) to analyze high-frequency signals through a digital architecture. On-wafer probe measurements were performed to limit parasitic interference from bonding wires and enclosed packaging.

Modeling the Local Rainfall Effects on Millimeter-Wave Propagation Using Homogeneous Meteorological Areas

The prediction of rain rate is one of the important topics in analyzing wireless communication systems, particularly in the analysis of broadband satellite links operating in the Ku-band (12-18 GHz), K-band (18-26.5 GHz), and Ka-band (26.5-40 GHz). A perfect physical model for the rain attenuation requires some parameters which are not available in most places on the Earth. This letter shows how to use the climatology skills to recognize homogeneous meteorological areas for two different countries and how to generalize the rain-rate attenuation prediction model of one city to another. The proposed method is then compared with the International Telecommunication Union model and the method of moments to confirm the results.