A method and apparatus for improving signal reception in a radio signal receiver is provided. The method comprises: receiving a signal from one or more remote sources; determining movement of the receiver; obtaining first and second phasor sequences indicative of the determined movement of the receiver in first and second directions; generating a third phasor sequence based on a weighted combination of the first and second phasor sequences in accordance with the first and second directions; and providing a correlation signal using the third phasor sequence, wherein providing the correlation signal comprises correlating a local signal with the received signal, and combining at least one of the local signal, received signal, and the result of the correlation with the third phasor sequence, such that a signal received along the second direction is suppressed relative to a signal received along the first direction. A corresponding positioning system is also disclosed.

A method and apparatus for improving signal reception in a radio signal receiver is provided. The method comprises: receiving a signal from one or more remote sources; determining movement of the receiver; obtaining first and second phasor sequences indicative of the determined movement of the receiver in first and second directions; generating a third phasor sequence based on a weighted combination of the first and second phasor sequences in accordance with the first and second directions; and providing a correlation signal using the third phasor sequence, wherein providing the correlation signal comprises correlating a local signal with the received signal, and combining at least one of the local signal, received signal, and the result of the correlation with the third phasor sequence, such that a signal received along the second direction is suppressed relative to a signal received along the first direction. A corresponding positioning system is also disclosed.

The disclosure relates to a method for determining the visibility of a satellite for a GNSS-based position determination, including: detecting the environment in a position, in particular determining an unobstructed view of the sky, by means of an environment sensor system and/or a GNSS sensor system and/or a camera sensor system; and merging the detected environment, in particular the unobstructed view of the sky, with a theoretical visibility of a satellite in the position.

The disclosure relates to a method for determining the visibility of a satellite for a GNSS-based position determination, including: detecting the environment in a position, in particular determining an unobstructed view of the sky, by means of an environment sensor system and/or a GNSS sensor system and/or a camera sensor system; and merging the detected environment, in particular the unobstructed view of the sky, with a theoretical visibility of a satellite in the position.

A method and apparatus for performing satellite signal acquisition are described. In one embodiment, a method for using a satellite antenna comprises estimating antenna orientation when the antenna is in motion, including estimating yaw using one or more sensors; and performing signal acquisition to search for a satellite signal with the satellite antenna by interleaving a plurality of signal searches performed by the satellite antenna, the plurality of signal searches being based on an estimated yaw.

The approach presented here relates to a method for detecting a group runtime variation for a navigation sensor for a navigation system for a vehicle. The method comprises a step of reading and a step of determining. In the reading step, at least one first GNSS simulator signal is read from a virtual satellite of a virtual global navigation satellite system at a first time and a second GNSS simulator signal is read from the virtual satellite or from at least one second virtual satellite of the virtual navigation satellite system at a second time different to the first time by means of a read device. The group runtime variation is determined using the first GNSS simulator signal and the second GNSS simulator signal in the determining step.

The approach presented here relates to a method for detecting a group runtime variation for a navigation sensor for a navigation system for a vehicle. The method comprises a step of reading and a step of determining. In the reading step, at least one first GNSS simulator signal is read from a virtual satellite of a virtual global navigation satellite system at a first time and a second GNSS simulator signal is read from the virtual satellite or from at least one second virtual satellite of the virtual navigation satellite system at a second time different to the first time by means of a read device. The group runtime variation is determined using the first GNSS simulator signal and the second GNSS simulator signal in the determining step.

A system for identifying spoofed navigation signals includes a multi-element antenna configured to receive a plurality of navigation signals. The system also includes at least one processor configured to determine an angle of arrival for each of the navigation signals and analyze the angles of arrival for the navigation signals to determine whether one or more of the navigation signals are spoofed. To analyze the angles of arrival for the navigation signals, the at least one processor may be configured to (i) determine whether two or more of the navigation signals were received at substantially the same angle of arrival (which may be based on a difference of less than 5° between the angles of arrival) and/or (ii) compare the angles of arrival for the navigation signals to at least one expected angle of arrival (which may be based on information about expected or actual positions of multiple satellites).

A system for identifying spoofed navigation signals includes a multi-element antenna configured to receive a plurality of navigation signals. The system also includes at least one processor configured to determine an angle of arrival for each of the navigation signals and analyze the angles of arrival for the navigation signals to determine whether one or more of the navigation signals are spoofed. To analyze the angles of arrival for the navigation signals, the at least one processor may be configured to (i) determine whether two or more of the navigation signals were received at substantially the same angle of arrival (which may be based on a difference of less than 5° between the angles of arrival) and/or (ii) compare the angles of arrival for the navigation signals to at least one expected angle of arrival (which may be based on information about expected or actual positions of multiple satellites).

An apparatus for locating an object of interest using offset. The object may be a mobile platform, or portion of same, associated with a vehicle, or a pavement segment or feature of or on a pavement segment on which the mobile platform is located. The vehicle includes first and second fixed points having a known offset from each other. An image sensor whose field of view includes the second fixed point and a segment of the pavement surface provides image data which is used with the known offset to calculate the precise location of the object of interest.