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A novel ellipse cavity-backed and slot-tuned bow-tie antenna was designed to facilitate the application of ultra-wide band (UWB) ground penetrating radar (GPR) in low frequency. Lumped resistor loading was applied at the end of antenna arms to broaden the impedance bandwidth. Taper tuned method was also used to optimize the current distribution. Antenna characteristic was analyzed by simulation. Finally,...
China's Mars probe including an orbiter and a landing rover will be launched by 2020. A subsurface penetrating radar (SPR) instrument has been selected to be a part of the payload on the rover. The main scientific objective of the SPR is to characterize the thickness and sub-layer distribution of the Martian soil. The SPR consists of two channels. The low frequency channel of the SPR will provide...
Lunar Regolith Penetrating Radar (LRPR) is a high resolution penetrating and imaging radar, which is a main payload onboard the detector of Chang'E-5. It is mounted on the bottom of the detector of Chang'E-5 and its main task is to survey the lunar regolith thickness and subsurface structure of landing domain. Because the detector is static, LRPR has to work only in stationary condition and is designed...
This paper describes an array antenna system for lunar regolith penetrating radar (LRPR), which is an important payload onboard the lander of Chang'E-5. The array's proposed operational frequency range is from 1000MHz ∼ 3000MHz. It has 12 elements arrayed along their H plane. The elements are designed into a compact Vivaldi antenna with 1/4 elliptical slot in order to realize the need for ultra-wideband,...
Two-way opportunistic relaying (TWOR) systems in amplify-and-forward (AF) strategy have been widely studied because of simplicity and high spectral efficiency. However, there have been few investigations into the performance of these systems. In this study, the authors present a performance analysis of the equal power allocation (EPA) scheme for the TWOR-AF systems over independent and non-identically...
To achieve five-level pulse width modulation (PWM) operation, a single-phase voltage-source inverter is proposed. A shunt active power filter based on the proposed inverter is implemented to achieve harmonics elimination, reactive power compensation and dc-link voltage regulation. Whereas eight power switches are used in the conventional five-level inverter, only six power switches are needed in the...
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