An Integrated and Cost-Effective Simulation Tool for GNSS Space Receiver Algorithms Development João S. Silva, Hugo D. Lopes, Tiago R. Peres, José M. Vasconcelos, Maria M. Coimbra, Pedro Freire, DEIMOS Engenharia Pedro Palomo, Juan Pérez, José A. Pulido, DEIMOS Space Alberto Garcia, Josep Roselló, European Space Agency BIOGRAPHIES João S. Silva received his Aerospace Engineering degree from Instituto Superior Técnico, Portugal, in 2004. He worked as a Research Engineer in Instituto de Telecomunicações from 2003 to 2005, when he joined DEIMOS Engenharia, where he is currently working as a Project Manager in the GNSS Technologies Division. His areas of expertise focus on GNSS, including signal processing algorithms, systems engineering, and simulation tools. Hugo D. Lopes received his Double-Master degree in Aerospace Engineering from Delft University of Technology, The Netherlands, and Instituto Superior Técnico, Portugal, in 2011. He is currently a Project Engineer in the GNSS Technologies Division of DEIMOS Engenharia, where he started working in December of 2011. Tiago R. Peres received his MSc degree in Aerospace Engineering from Instituto Superior Técnico, Portugal, in 2008. He joined Deimos Engenharia in 2008, where he is currently working as a Project Engineer in the GNSS Business Unit. Since then, he has been involved in GNSS Signal Tracking Algorithms, Multipath Mitigation Techniques, Software Simulation Tools, Digital Signal Processing Using FPGAs and GNSS-Reflectometry. José M. Vasconcelos José F. Vasconcelos received the Licenciatura and the Ph.D. degrees in electrical engineering from the Instituto Superior Técnico (IST), Lisbon, Portugal, in 2003 and 2010, respectively. Since 2009, he has been a Project Engineer with DEIMOS Engenharia’s Flight Systems Business Unit. His research interests include nonlinear observers, inertial navigation systems, rendezvous, and robust control. Maria M. Coimbra received her Aerospace Engineering degree from Instituto Superior Técnico, Portugal, in 2012. She is currently a Project Engineer in the GNSS Technologies Division of DEIMOS Engenharia, where she started working in September of 2012. She has been actively involved in EGNOS v3 and ionosphere modeling. Pedro Freire received his Aerospace Engineering degree from Instituto Superior Técnico, Portugal, in 2001 and since then has been working in receiver and navigation related applications and technology. Since 2005, he has been working at DEIMOS Engenharia as responsible for the GNSS Technologies Division. Pedro Palomo received his MSc in Computer Science by the UPM , Spain, in 2002. He is currently a Project Manager in the Embedded Systems Division of DEIMOS Space, where he started working in 2002. He is involved in activities related to safety‑critical SW for real-time systems and real-time test benches. Juan Pérez received his Bachelor+Master degree in Electronics, Communications and Computer Engineering from University of Alcalá, Spain, in 2012. He is currently a Project Engineer in the Embedded Systems Division of DEIMOS Space, where he started working in 2010. José Antonio Pulido was graded with a MsC and a PhD in Telecommunications Engineering by the UPM where he specialized in safety-critical software development. After this, he joined DEIMOS Space, where he develops algorithms in different GNSS navigation projects as well as safety-critical SW for real-time systems, such as Galileo Ground Mission Segment. Alberto Garcia Alberto Garcia-Rodriguez works in the radio navigation section in ESA. He is involved in activities related to GNSS space receivers and applications. He worked previously at GMV (Spain) for several navigation projects. He has an MSc in Telecommunications Engineering from the T.U. of Madrid (1992). Josep Roselló graduated as Telecommunications Engineer from Polytechnic University of Catalonia in Barcelona and, in 1998, completed an MBA in Rotterdam. He started as engineer at ESA ESTEC in 1993 in the Data System Division and, since 2007, has been with the Future Missions Division of the Earth Observation Directorate at ESTEC. His current responsibilities include internal research and