Radiobased locating system provided with a synthetic aperture

1. A method for increasing measurement precision of a radio-based position determination system comprising a mobile station and at least one stationary station, the method comprising:

detecting a movement of the mobile station starting from an initial position, the detecting utilizing measurement data of an absolute sensor system and a relative sensor system;

generating a virtual antenna in a form of a synthetic aperture utilizing the measurement data by relative coordinates to a reference point, and focusing either: a) the mobile station on the stationary station or; b) the stationary station on the mobile station, the focusing utilizing the synthetic aperture;

wherein the absolute sensor system is generated from at least one secondary radar and at least one transponder; and

wherein either: c) the mobile station is the secondary radar and the at least one stationary station is the transponder or; d) the mobile station is the transponder and the at least one stationary station is the secondary radar.

2. The method according to claim 1 , further comprising:

utilizing the synthetic aperture via a suitable selection of at least one of a size of the aperture, the amplitude, and phase weighting of the measurement data of the absolute sensor system for generating a direction behavior of the synthetic aperture, such that its direction diagram lies nearly homogeneously in a region of an error ellipse of an arbitrary preceding position measurement.

3. The method according to claim 2 , further comprising:

performing an initial rough focusing utilizing a measurement value of at least one of an absolute sensor system and a relative sensor system.

4. The method according to claim 2 , further comprising:

performing an initial rough focusing utilizing information of preceding measurements.

5. The method according to claim 1 , further comprising:

utilizing the synthetic aperture via a reverse calculation ensuing from a known position of the stationary station to unknown positions of the mobile station, which reverse calculation ensues via a mapping method with synthetic aperture, via a broadband holographic mapping method.

6. The method according to claim 5 , wherein:

for reverse calculation of a point b(x, y, z) of a first station, the method further comprising:

correlating a measured acquisition signal E n (ω) with a theoretical function F n (a n , r, ω) that a first station would generate at a position r=(x, y, x) T considered from the measurement point a n =(x n , y n , z n ) T of the second station.

7. The method according to claim 6 , further comprising utilizing a reconstruction rule according to the following equation:

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8. The method according to claim 7 , wherein an ultimate reconstruction rule is provided as:

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9. The method according to claim 1 , further comprising:

utilizing the synthetic aperture via a reverse calculation of known positions of the mobile station to an unknown position of the stationary station.

10. The method according to claim 1 , further comprising:

calculating distance and angle information between the mobile station and the stationary station.

11. The method according to claim 10 , wherein the mobile station is a secondary radar and the stationary station is a transponder.

12. The method according to claim 10 , further comprising:

merging, with a Kalman filter for one or more positions, the distance and angle data of one or more mobile stations.

13. The method according to claim 10 , further comprising:

executing the stationary stations as passive back-scatter tags; and

providing an absolute position determination according to distance and angle relative to the mobile station.

14. The method according to claim 1 , further comprising:

repeating the steps to improve the position determination of the mobile station.

15. A device to increase measurement precision of a radio-based position determination system, comprising:

a mobile station;

at least one stationary station;

an absolute sensor system generated from at least one secondary radar and at least one transponder;

at least one relative sensor system provided for quantification of a magnitude and a direction of a position change of the mobile station relative to an original position;

a signal processing device for common processing of measurement data acquired via the absolute sensor system and the relative sensor system for generation of a virtual antenna in a form of a synthetic aperture, wherein either: a) the mobile station is the secondary radar and the at least one stationary station is the transponder or; b) the mobile station is the transponder and the at least one stationary station is the secondary radar; and

a focusing device for focusing one to the other of at least one of: a) the mobile station on the stationary station and b) the stationary system on the mobile station based on the synthetic aperture.

16. The device according to claim 15 , wherein the mobile station is formed by a transponder and the at least one stationary station is formed by a secondary radar.

17. The device according to claim 16 , further comprising:

a data transmission device for transfer of data from at least one secondary radar to the signal processing device.

18. The device according to claim 15 , further comprising:

a data transmission device for transfer of data from at least one secondary radar to the signal processing device.

19. The device according to claim 15 , further comprising:

a Kalman filter for rough prediction of a position value of a stationary station, which rough prediction serves as prior information.

20. The device according to claim 15 , wherein the positioning system is an RTOF (round trip time of flight) or a TOA (time of arrival) radio positioning system.