Integration and Testing of a Wide-Band Airport Pseudolite
The paper provides initial results of a series of flight tests conducted using the LAAS Test Prototype/Airport Pseudolite system.
Flight test results of an integrated wideband airport pseudolite for the local Area Augmentation System
ABSTRACT: This paper details the first real-time integration of a wideband airport pseudolite (WBAPL) into the Local Area Augmentation System (LAAS) and illustrates the benefits accrued from this integration. Flight test results obtained using two pulsing formats (1/11th and a modified RTCA pulsing format), a full GPS satellite vehicle (SV) constellation, and a reduced SV set are presented. While WBAPL bias-value (B-value) averages were generally higher than those obtained for GPS SVs (the standard deviations were comparable), inclusion of the WBAPL still provided an improvement in performance for a reduced GPS SV constellation set. With a healthy constellation (11 SVs), integration of the WBAPL into the differential solution resulted in little difference in the final solution over the last 2.5 to 0.2 nmi of the approaches. However, with a reduced constellation available (˜4–5 SVs), inclusion of the WBAPL resulted in a significant improvement in the LAAS system performance in terms of an increase in availability, decrease in vertical dilution of precision (VDOP), and increase in position accuracy over the differential GPS (DGPS)-only case.
Simulation and control of hybrid renewable energy system connected to the grid
This paper presents a control and simulation of hybrid renewable energy system connected to the grid. The studied system includes a photovoltaic panel, synchronous permanent magnet generator based wind turbine, and a battery for storage energy. The PV array and wind systems are connected to the common DC bus by a boost converter. The battery is connected by a bi-directional DC/DC converter, and then integrated into the AC utility grid via a common DC/AC inverter. In order to extract the maximum energy, a simulation study has been carried out according to the meteorological conditions (wind speed and variable solar irradiance) while maintaining power quality at a satisfactory level. In order to capture the maximum power, a MPPT algorithm is applied for both wind turbine and photovoltaic panel. The modeling and simulation of the whole system has been performed under Matlab/Simulink environment. The obtained results show that the current and the voltage of grid side are sinusoidal and alternative forms, and the power injected to the grid is around the power produced by the hybrid system.