Abstract: Systems and methods utilize an inertial navigation sub-system configured to determine a plurality of relative positions of the navigation system from a reference position based on the determined speed and/or acceleration and/or direction of the navigation system and/or changes thereto; and a position estimator sub-system configured to estimate the absolute position of the navigation system based on at least two received signals. A first track is defined based on the plurality of relative positions determined by the inertial navigation sub-system during a period of time and a second track is defined based on the plurality of estimates of the absolute position by calculating a best fit using the plurality of estimates of the absolute position, where the second track approximates a same shape as the first track.

Abstract: Systems and methods determine a position using uncoordinated signals containing timing information. The systems and methods use uncoordinated signals of opportunity, such as radio time signals, to determine a position of a receiver by determining the relative synchronization of the signals of opportunity at a known location and, at a later time and unknown locations, using trilateration or multilateration of the signals of opportunity to determine the position of the receiver.

Abstract: Systems and methods utilize an inertial navigation sub-system configured to determine a plurality of relative positions of the navigation system from a reference position based on the determined speed and/or acceleration and/or direction of the navigation system and/or changes thereto; and a position estimator sub-system configured to estimate the absolute position of the navigation system based on at least two received signals. A first track is defined based on the plurality of relative positions determined by the inertial navigation sub-system during a period of time and a second track is defined based on the plurality of estimates of the absolute position by calculating a best fit using the plurality of estimates of the absolute position, where the second track approximates a same shape as the first track.

Abstract: Systems and methods determine a position using uncoordinated signals containing timing information. The systems and methods use uncoordinated signals of opportunity, such as radio time signals, to determine a position of a receiver by determining the relative synchronization of the signals of opportunity at a known location and, at a later time and unknown locations, using trilateration or multilateration of the signals of opportunity to determine the position of the receiver.

Abstract: The invention relates to a method of interference suppression in a radar system (10) and also to a system (10) operating according to the method. The system (10) incorporates a first antenna (40) and associated electronic circuits for emitting interrogating radar radiation towards a remote scene (S). Moreover, the system (10) also incorporates a second antenna (45) and associated electronic circuits for receiving interrogating radiation reflected from the scene (S) and generating correponding first and second processed signals. The first and second processed signals correspond to a broader main beam response of the antenna (45) and to a narrower main beam response thereof respectively. By mutually comparing the first and second processed signals, the system (10) is operable to identify those second processed signals affected by interference from the scene (S).

Abstract: The invention relates to a method of interference suppression in a radar system and also to a system operating according to the method. The system incorporates a first antenna and associated electronic circuits for emitting interrogating radar radiation towards a remote scene. Moreover, the system also incorporates a second antenna and associated electronic circuits for receiving interrogating radiation reflected from the scene and generating corresponding first and second processed signals. The first and second processed signals correspond to a broader main beam response of the antenna and to a narrower main beam response thereof respectively. By mutually comparing the first and second processed signals, the system is operable to identify those second processed signals affected by interference from the scene.