Digital line scan camera

• US 8,085,299 B2
• Filed: 09/17/2008
• Issued: 12/27/2011
• Est. Priority Date: 09/17/2007
• Status: Active Grant

• Current Assignee: Deutsches Zentrum Fã¼R Luft- Und Raumfahrt E.V.
• Original Assignee: Deutsches Zentrum Fã¼R Luft- Und Raumfahrt E.V.
• Inventors: Börner, Anko, Eckardt, Andreas, Lehmann, Frank
• Primary Examiner(s): Ye, Lin
• Assistant Examiner(s): Morehead, III, John H
• Application Number:
  US12/211,949
• Publication Number:
  US 20090073280A1
• Time in Patent Office: 1,196 Days
• Field of Search: 348/49, 348/50, 348/295, 348143-145, 356/3.07, 381/318, 396/9
• US Class Current: 348/145
• CPC Class Codes: G01C 11/02 Picture taking arrangements specially adapted for photogrammetry or photographic surveying, e.g. controlling overlapping of pictures
• CPC Class Codes: H04N 2101/00 Still video cameras
• CPC Class Codes: H04N 2201/3253 Position information, e.g. geographical position at time of capture, GPS data
• CPC Class Codes: H04N 23/6811 based on the image signal
• CPC Class Codes: H04N 25/701 Line sensors

Abstract

Disclosed is a digital line scan camera, having at least at least one focal plane, on which at least one linear photosensitive sensor is arranged, an objective lens, and a location measurement system. The location measurement system is used to determine six external location parameters, where the location system measurement comprises a satellite-supported position determination device and an inertial navigation measurement unit. The line scan camera includes at least on two-dimensional photosensitive sensor, which is synchronously driven with the linear sensor. At least one displacement vector ({right arrow over (x)}) is calculated from the data of the minimum of one two-dimensional photosensitive sensor, and where the displacement vector ({right arrow over (x)}) is used to correct the date of the inertial measurement unit.

Claims

1. A digital line scan camera comprising:

at least one focal plane;

at least one linear photosensitive sensor arranged on the at least one focal plane;

at least one two-dimensional photosensitive sensor arranged on a second focal plane, the at least one two-dimensional photosensitive sensor synchronously driven with the linear sensor;

an objective lens arranged a distance from the at least one focal plane;

a location measurement system comprising a satellite-supported position determination device and an inertial navigation measurement unit, the location measurement system fixedly arranged with respect to the at least one focal plane, the location measurement system configured to determine six external location parameters; and

an evaluation unit configured to calculate at least one displacement vector ({right arrow over (x)}) from data of the at least one two-dimensional photosensitive sensor, wherein

the evaluation unit is further configured to use the displacement vector ({right arrow over (x)}) to correct data of the inertial navigation measurement unit.

2. The digital line scan camera according to claim 1, wherein the at least one two-dimensional photosensitive sensors comprises at least two two-dimensional photosensitive sensors.

3. The digital line scan camera according to claim 1, wherein the at least one two-dimensional photosensitive sensors are each arranged on the same focal plane as the at least one linear photosensitive sensor.

4. The digital line scan camera according to claim 1, wherein the at least one two-dimensional photosensitive sensor has a step of at least 64×

64 pixels.

5. The digital line scan camera according to claim 1, wherein the at least one two-dimensional photosensitive sensor has a size each to or less than 1024×

1024 pixels.

6. The digital line scan camera according to claim 1, wherein the at least one two-dimensional photosensitive sensor has a size between 64×

64 and 1024×

1024 pixels.

7. The digital line scan camera according to claim 1, wherein a pixel size of the at least one two-dimensional photosensitive sensor is less than or equal to half a pixel size of the at least one linear photosensitive sensor.

8. The digital line scan camera according to claim 1, wherein the at least one two-dimensional photosensitive sensor is read out at twice a frequency at least one of the linear photosensitive sensor.

9. The digital line camera according to claim 1, wherein the at least one two-dimensional photosensitive sensor is arranged at an edge of the at least one focal plane.

10. The digital line camera according to claim 3, wherein the at least one two-dimensional photosensitive sensor is arranged at an edge of the at least one focal plane.

11. The digital line camera according to claim 1, wherein at least one of the at least one two-dimensional photosensitive sensor and the at least one linear photosensitive sensor is a CCD sensor.

12. The digital line camera according to claim 1, wherein at least one of the at least one two-dimensional photosensitive sensor and the at least one linear photosensitive sensor is a CMOS sensor.

13. The digital line scan camera according to claim 1, wherein the at least one linear photosensitive sensor comprises at least two parallel lines offset by at least a fraction of a pixel.

14. The digital line scan camera according to claim 1, wherein the at least one linear photosensitive sensor comprises at least two lines that are not staggered.

15. The digital line camera according to claim 1, wherein the focal plane, the objective lens, and the location measurement system are rigidly arranged with respect to one another.

16. The digital line scan camera according to claim 1, wherein the inertial navigation measurement unit has a high degree of stability and a low relative accuracy.

17. A method for correcting data of an inertial navigation unit, the method comprising:

receiving data from at least one linear photosensitive sensor arranged on a first focal plane at a first and second time;

receiving data from at least one two-dimensional photosensitive sensor arranged on a second focal plane at a first and second time;

driving the at least one linear photosensitive sensor in synchrony with the at least one two-dimensional photosensitive sensor;

receiving position data from a satellite-supported position determination device at the first and second time;

receiving space angle data from an inertial navigation measurement unit at the first and second time;

determining a displacement vector for the at least one two-dimensional photosensitive sensor based in part on the data received at first and second time;

determining movement parameters based in part on the determined displacement vector; and

correcting the space angles based in part on the movement parameters.

18. The method according to claim 17, further comprising movement parameters are roll, pitch, and yaw.

19. The digital line camera according to claim 18, further comprising determining movement parameters based in part on the determined displacement vector, wherein the data is received in synchronization with a single clock frequency.