NAVISP shows that the more (sensors), the merrier...
NAVISP projects addresses the wide PNT field of techniques, in particular the investigation of new type of sensors and their integration. These are results of projects recently concluded. Results of on-going projects will be presented as soon as they have been validated.
Quantum Wayfinder (NAVISP Element 1), set out to explore the feasibility of using quantum cold atom interferometry (CAI) gravity gradiometers with gravity gradient maps to reduce Inertial Navigation Systems drift over time. The project showed that gravity gradient map matching is feasible and offers significant improvements in passive navigation, and current CAI state of the art performance is sufficient, but the level of improvement offered depends heavily on the use case, vehicle dynamics and trajectory.
GNSS/non-GNSS Sensor Fusion for Resilience in High Integrity Aviation Applications (NAVISP Element 1) combined GNSS with avionic sensors to improve integrity of PNT for aviation applications, to assess the suitability of multisensor navigation for operations more demanding than LPV-200 or CAT I. Four integrity monitoring algorithms were designed, which were intended to cover the most significant hybridization directions. Using also actual flight test data, the project showed that GNSS plus altimeter in a least square filter, and GNSS plus altimeter and inertial measurement unit in an extended Kalman filter can provide accuracies below the LPV-200 and CAT I requirements.
Maritime AI-NAV (NAVISP Element 1) (Artificial Intelligence / Machine Learning Sensor Fusion for Autonomous Vessel Navigation), explored integration of GNSSs with different environmental sensors (visual cameras, microphones, LiDAR, RADAR, Automatic Identification System) to provide situational awareness to the vessel and, using Machine Learning algorithms, to detect and identify targets, and perform ranging to them. In the project, also employing real vessels, it was found out that localization of the vessel is possible with high-precision, however, integrity, reliability, and continuous availability is the challenge in maritime operations. Visual camera data seems to work well for reading the surroundings of the ship, and LIDAR is useful while berthing.
MUSE4PNT, Multi-Sensor, Multi-System For Space PNT Applications (NAVISP Element 1), set as an objective to design a multi-sensor navigation suite for applications like satellite orbit raising or station keeping, and rendezvous around Earth's or other celestial body's orbit for in orbit servicing. The solutions proposed contemplate the use of electric propulsion, GNSS plus inertial systems for absolute navigation and relative-GNSS and cameras for relative navigation close to the rendezvous for Earth geostationary orbit, with the addition of DORIS-like beacons for rendezvous with the spacecraft in other celestial body's orbit. In the latter case, the camera images of the celestial body were used to establish the satellite's altitude and attitude.