ESA's NAVISP Invitations to Tender invitations to tender from NAVISPFri, 14 Feb 2020 14:31:53 +0000Next Generation network-assisted PNT assurance assurance against malicious threats like spoofing relies on four main enablers: - authenticity of the information relating to the nodes used for computing the position (e.g. clock and ephemeris data of GNSS satellites). It can be built and distributed in a network-assisted configuration, for instance by monitoring the PNT system or accessing directly the original information; -…Fri, 14 Feb 2020 14:31:53 +0000latest-ittsitt-62Hollow Corner Cube Retro-Reflectors In-Orbit PNT solid Corner Cube Retro-reflector (CCR) arrays are often implemented to allow laser tracking of satellites from ground. In order to achieve a measurable return signal, such arrays are typically rather large, and as conventional corner cubes are made of glass, the arrays are typically high in mass. However, in recent years, interest has grown in using hollow corner cubes for space…Fri, 14 Feb 2020 14:31:17 +0000latest-ittsitt-66Next Generation Motion Sensors for Hybrid GNSS INS Solutions in high accuracy machine control applications, machine control, industry automation require high accuracy positioning, as well as very robust PNT to support autonomous operations. Relative motion sensors (e.g. IMU) are key to complement GNSS in case of outage or for enhanced robustness and sustained high accuracy. In open sky, the state-of-the-art of GNSS and IMU provide good performance. However, cost-efficient IMUs still face…Fri, 14 Feb 2020 14:31:15 +0000latest-ittsitt-64User Antenna Diversity for efficient multipath mitigation impact of multipath and fading in harsh propagation conditions is still among the main sources of errors in PNT solutions for mobile users. Besides code-based positioning accuracy, they affect convergence time of carrier-based solutions (e.g. PPP) and may prevent ambiguity resolution. For handheld user equipment (HH-UE) such as smartphones and tablets, antenna performance is traded against…Fri, 14 Feb 2020 14:28:56 +0000latest-ittsitt-70Proof of concept of hybrid 5G-NR/GNSS Positioning with ad-hoc overlay has become the corner stone of worldwide positioning applications, and in particular for those requiring high-accuracy. The outstanding performances in open sky and very competitive performances in degraded environments of GNSS are widely acknowledged, but also the need to complement GNSS by other technologies to address specific needs in challenging environments. In this context, 5G…Fri, 14 Feb 2020 14:28:53 +0000latest-ittsitt-72Multi-layer PNT for SAR Search and Rescue (SAR) standards are set and overseen by COSPASSARSAT. SAR instruments are currently flying on board MEO satellites in several GNSS constellations. These platforms complement the existing LEOSAR and GEOSAR satellites. Existing LEO/GEOSAR are slow in detecting an active beacon due to several limitations in design (limited satellites, fast orbits, no independent location…Fri, 14 Feb 2020 14:26:05 +0000latest-ittsitt-67Interference Monitoring from Space great number of civilian and military applications relies on GNSS for PNT, however its availability could be put at risk by threats such as local interference, amongst others.  GNSS spectrum monitoring is essential for: detecting, characterising and localising interference sources, which could endanger the adequate reception and processing of GNSS signals;  initiating a justified…Fri, 14 Feb 2020 14:25:44 +0000latest-ittsitt-65Earth Moon GNSS Spaceborne Receiver for In-Orbit-Demonstration GEO and GTO missions already exploit GNSS signals for in-orbit PNT. NASA’s MMS mission has recently demonstrated that tracking of GPS signals is possible up to 150,000 km from Earth surface (half-way the distance to the Moon).  The feasibility of extending the use of GNSS for missions to the Moon has also preliminarily been assessed by ESA via GSP. These preliminary studies have…Fri, 14 Feb 2020 14:10:23 +0000latest-ittsitt-61New Concept for Evolutive Mitigation of RFI to GNSS frequency interference, intentional or not, is considered to be among the main threats to safety-critical and commercial GNSS applications. This includes out-ofband emissions, privacy-protection devices (PPD) also known as in-car jammers, etc. Consequently, many COTS GNSS receivers nowadays integrate mitigation strategies for RF interferences (jamming and spoofing). Moreover, one can note…Fri, 14 Feb 2020 14:09:31 +0000latest-ittsitt-73An Innovative concept for the Risk Assessment of Geologic Hazards using GNSS and Solid Earth Tides Modelling is long debated whether a relation exists between the tidal stress produced by the Moon and the Sun on the Earth crust and the occurrence of difference geologic events, in particular large earthquakes and volcanic eruptions. Clear evidence for this relation has been elusive for a long time. However, the analysis of more complete global earthquake catalogues has shown that a significant…Fri, 14 Feb 2020 14:07:35 +0000latest-ittsitt-69Machine-Learning to model GNSS systems simulations are an important toolset supporting system engineering trade-offs and decisions. They are used to display and monitor key system performance indicators as well as study system behaviour, both through synthetic scenarios and real data replay. Industry and ESA currently use different tools to simulate GNSS systems, however often constrained to undertake only one of two different…Mon, 03 Feb 2020 08:21:14 +0000latest-ittsitt-58