Method and system for multipath detection
AssigneeAlpine Electronics, Inc.
InventorKijuro Obata
Life of this patent
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Abstract
A navigation system including a GPS receiver; a variable directivity antenna capable of forming a null point in at least one direction; a null point setting unit for setting the null point of the variable directivity antenna in the direction of a GPS satellite that can perform positioning; and a multipath determination unit for determining whether a reception signal from the variable directivity antenna is in a multipath state in accordance with the reception signal.
Claims20
A receiver for receiving spread-spectrum signals by a direct spread system from satellites, comprising:
- a variable directivity antenna operable to form a null point in at least one direction;
- a null point setting unit operable to set the null point of the variable directivity antenna in the direction of a satellite that can perform positioning;
- and
- a multipath determination unit operable to determine whether a reception signal from the variable directivity antenna is in a multipath state in accordance with the reception signal.
A navigation system, comprising:
- a receiver including a variable directivity antenna operable to form a null point in at least one direction;
- a null point setting unit operable to set the null point of the variable directivity antenna in the direction of a satellite;
- and a multipath determination unit operable to determine whether a reception signal from the variable directivity antenna is in a multipath state in accordance with the reception signal;
- a position detection unit operable to detect a position of the movable body in accordance with an output signal from the receiver;
- a map storage unit operable to store data including map data;
- a display;
- and
- a display control unit operable to read map data corresponding to the position of the movable body detected by the position detection unit from the map storage unit and display the map data on the display.
A multipath detection method in a receiver for receiving spectrum-spread signals by a direct spread system from satellites, comprising:
- setting a null point of a variable directivity antenna in a direction of a satellite;
- and
- determining whether a reception signal received from the variable directivity antenna is in a multipath state.
A position detection method comprising the acts of:
- setting a null point of a variable directivity antenna in a direction of a global positioning system satellite;
- determining whether a reception signal received from the variable directivity antenna is in a multipath state in accordance with the reception signal;
- and
- detecting a position of the movable body in accordance with a plurality of reception signals that is determined not to be in the multipath state.
Dependencies are inferred from the claim text.