Abstract: The present invention consists of a method to ensure the integrity of the navigation solution even when the user is in a non controlled environment as it is the case of urban and road applications. The method requires the existence of a Signal In Space with guaranteed integrity as the one today provided by SBAS systems or from GBAS, Galileo or GPS-III in the future. The invention covers the algorithms to detect and isolate errors present in non controlled environments such as multipath and compute resulting position error bounds with the required level of integrity. This invention substantially increases the field of application of satellite navigation systems with associated integrity to the so-called liability critical applications.

Abstract: A system to provide to different users with information about position coordinates of remote mobile vehicles or individuals (mobile agent) guarantying that each particular position data, as it is provided to the user, is within certain error boundaries. The system is composed by a number of mobile units (MU) installed at the mobile agents and a Central Platform (CP). The MU consists of a GPS/SBAS and/or a Galileo navigation receiver that includes specific autonomous integrity algorithms and a transceiver to transmit GPS/SBAS and/or Galileo derived data to the CP. The CP receives data from MU and enhances position estimation and position integrity. Integrity is guaranteed by the use of a GNSS Integrity service (either provided by SBAS or Galileo) and specific autonomous integrity algorithms that ensure the position integrity in non-controlled environments. The CP provides access to MUs position data to multiple Users via Internet or dedicated telecommunications links.