Pedro F. B. Silva

Learn More
The ATENEA (Advanced Techniques for Navigation Receivers and Applications) project aims to join deeply integrated GNSS/INS receiver architectures and LIDAR techniques to provide an advanced navigation solution. The approach is suitable for a wide range of surveying applications in difficult environments, being Urban Mapping selected as reference case.(More)
The Factored Correlator Model (FCM) is an analytical model for the outputs of a GNSS receiver's correlators. The FCM precludes the need for simulation of the lower-level signal processing stages, significantly increasing simulation speed and considerably decreasing processing and memory requirements, while still keeping a high level of realism. Results for(More)
This paper will introduce the goals, concept and results of the project named CLOSE-SEARCH, which stands for ’Accurate and safe EGNOS-SoL Navigation for UAV-based low-cost Search-And-Rescue (SAR) operations’. The main goal is to integrate a medium-size, helicopter-type Unmanned Aerial Vehicle (UAV), a thermal imaging sensor and an EGNOS-based multi-sensor(More)
Increasing the GNSS receiver sensitivity and robustness in very harsh environments has become a central topic for the GNSS community. This paper addresses the design of a very High Sensitivity (HS) acquisition scheme for weak GNSS signal detection down to 5/10 dB-Hz in the particular space environment of the Lunar Low Orbit. A theoretical analysis for the(More)
The use of GNSS space receivers for autonomous orbit determination is receiving increasing interest due to the important economical and operational benefits made possible by the reduced on-ground operations and the improved pointing performance when associated to one Star Tracker. However, the exploitation of GNSS for navigating satellites in orbits beyond(More)
This paper describes a phase of the research program to determine the feasibility of a proposed FRP retrofit method to strengthen the corroded steel columns. This method consists in two steps: wrapping the corroded steel column with open FRP jacket and filling the jacket with expansive light-weight concrete. Seven steel columns were tested in the laboratory(More)
We describe a hybridized receiver architecture tightly coupled with different sensors, namely MEMS accelerometers and gyroscopes, Wi-Fi engine and a barometer, allowing significant increase of positioning performance for indoor GNSS signal reception. This is possible due to the increase of integration times, use of higher sensitivity GNSS receivers and by(More)
The ATENEA (Advanced Techniques for Navigation Receivers and Applications) project aims to join deeply integrated GNSS/INS receiver architectures and LIDAR techniques to provide an advanced navigation solution. The approach is suitable for a wide range of surveying applications in difficult environments, being Urban Mapping selected as reference case. This(More)
The deployment of Galileo and the modernization GPS will provide additional signals with increasingly complex modulations and multiplexing schemes, enabling performance enhancements in terms of availability, accuracy, and robustness. With the Galileo Initial Operational Capability (IOC) scheduled around mid-decade with fourteen satellites already ordered in(More)