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In this paper, we propose an adaptive tracking channel control mechanism for GNSS receivers in weak signal applications powered by renewable energy sources. The proposed technique dynamically adjusts tracking channels to get better time coverage and positioning availability under the desired accuracy requirement. A low-complexity hardware architecture is developed for power management and adaptive...
The point target response (PTR) and low-pass filter (LPF) features of the altimeter (ALT) onboard China’s HY-2A satellite are presented and analyzed. Via Monte-Carlo simulation, the look-up tables (LUTs) of the range (epoch), significant wave height (SWH), and backscatter (Sigma0) biases with respect to SWH and attitude angle (ATT) are calculated accounting for the instrument PTR and LPF features...
High sensitivity receivers and multiple satellite constellations have vastly improved GNSS signal availability in dense urban areas. However, accuracy remains a problem due to the blockage and reflection of many of the signals by buildings and other obstacles. Reliable metres-level positioning in dense urban areas is difficult to achieve cost-effectively using a single technology. The way forward...
Wide area measurements are becoming the basis of power system monitoring, protection and control. The frequency disturbance recorder (FDR) is actually a single-phase phasor measurement unit (PMU). It measures the voltage amplitude, angle and frequency from a single-phase 120-V wall outlet. Currently, the accuracy of synchrophasor measurements depends heavily on the precise time signal provided by...
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