Method, apparatus, and computer program product for radar detection of moving target

• US 7,071,867 B2
• Filed: 06/25/2004
• Issued: 07/04/2006
• Est. Priority Date: 06/25/2004
• Status: Expired due to Fees

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Wittenberg, Peter S., Mosher, Aaron Y.
• Primary Examiner(s): Sotomayor, John B.
• Application Number:
  US10/877,261
• Publication Number:
  US 20050285774A1
• Time in Patent Office: 739 Days
• Field of Search: 342 70- 72, 342/75, 342 90- 96, 342157-162, 342/189
• US Class Current: 342/70
• CPC Class Codes: G01S 13/726 Multiple target tracking
• CPC Class Codes: G01S 15/66 Sonar tracking systems
• CPC Class Codes: G01S 17/66 Tracking systems using electromagnetic waves other than radio waves

Abstract

Methods, apparatus, and computer program products are provided for tracking at least one moving target with a radar device without requiring the use of Doppler information. The invention comprises scanning an area with radar signals at a first time to receive a first plurality of target data signals indicative of a position of the target at the first time and determining the position of the target at the first time by collecting the first plurality of target data signals into a first target data grouping, such that the first target data grouping defines a first reference point. Similarly, a second reference point for the target is determined for a second time, and the position of the first reference point is compared to the position of the second reference point to track the moving target. Advantageously, the tracked positions of the moving target may be used to predict a future position of the target at a subsequent time.

Claims

1. A method of tracking at least one moving target with a radar device without requiring the use of Doppler information, the method comprising the steps of:

scanning an area with radar signals at a first time to receive a first plurality of target data signals indicative of a position of the target at the first time;

determining the position of the target at the first time by collecting the first plurality of target data signals into a first target data grouping, such that the first target data grouping defines a first reference point;

scanning the area with radar signals at a second time, that is different than the first time, to receive a second plurality of target data signals indicative of a position of the target at the second time;

determining the position of the target at the second time by collecting the second plurality of target data signals into a second target data grouping, such that the second target data grouping defines a second reference point; and

comparing the position of the first reference point to the position of the second reference point to track the moving target, such that no Doppler information is required when comparing the first and second reference points.

2. A method according to claim 1, further comprising the step of predicting at least one future position of the moving target at a third time, that is subsequent to the first and second times, based upon the previously tracked positions of the moving target.

3. A method according to claim 2 wherein comparing the positions of the target at the first and second times comprises using the predicted future position of a moving target to correlate first and second reference points to track two or more moving targets.

4. A method according to claim 1 wherein scanning the area with radar signals at the first time and the second time comprises continuously sweeping a real beam radar signal through 360°

.

5. A method according to claim 1 wherein determining the position of the target at the first time and the second time comprises parameterizing the first and second plurality of target data signals based upon predetermined criteria to define the first and second target data groupings and the first and second reference points.

6. A method according to claim 5 wherein parameterizing the first and second plurality of target data signals comprises comparing the decibel level of the target data signals to the predetermined criteria to identify a moving target and to define the first and second reference points.

7. A method according to claim 1 wherein comparing the positions of the target at the first and second times comprises eliminating target data groupings whose positions at the first and second times have changed more than a predetermined amount.

8. A method of navigating an autonomous vehicle using a radar device without requiring the use of Doppler information so that the vehicle is navigated relative to a moving target, the method comprising the steps of:

scanning an area proximate the vehicle with radar signals at a first time to receive a first plurality of target data signals indicative of a position of the target at the first time;

determining the position of the target at the first time by collecting the first plurality of target data signals into a first target data grouping, such that the first target data grouping defines a first reference point;

scanning the area with radar signals at a second time, that is different than the first time, to receive a second plurality of target data signals indicative of a position of the target at the second time;

determining the position of the target at the second time by collecting the second plurality of target data signals into a second target data grouping, such that the second target data grouping defines a second reference point;

comparing the position of the first reference point to the position of the second reference point to track the moving target, such that no Doppler information is required when comparing the first and second reference points; and

determining a trajectory of the vehicle based upon the tracked positions of the moving target relative to the vehicle.

9. A method according to claim 8, further comprising the step of predicting at least one future position of the moving target at a third time, that is subsequent to the first and second times, based upon the previously tracked positions of the moving target, wherein the trajectory of the vehicle is determined in accordance with the predicted future position of the moving target.

10. A method according to claim 9 wherein comparing the positions of the target at the first and second times comprises using the predicted future position of a moving target to correlate first and second reference points to track two or more moving targets.

11. A method according to claim 8, further comprising the step of converting the positions of the target from a vehicle coordinate system to an inertial coordinate system.

12. A method according to claim 11, wherein converting the positions of the target from a vehicle coordinate system to an inertial coordinate system comprises eliminating target data signals from at least one non-target object.

13. A method according to claim 8 wherein scanning the area proximate the vehicle with radar signals at the first time and the second time comprises continuously sweeping a real beam radar signal through 360°

.

14. A method according to claim 8 wherein determining the position of the target at the first time and the second time comprises parameterizing the first and second plurality of target data signals based upon predetermined criteria to define the first and second target data groupings and the first and second reference points.

15. A method according to claim 14 wherein parameterizing the first and second plurality of target data signals comprises comparing the decibel level of the target data signals to the predetermined criteria to identify a moving target and to define the first and second reference points.

16. A method according to claim 8 wherein comparing the positions of the target at the first and second times comprises eliminating target data groupings whose positions at the first and second times have changed more than a predetermined amount.

17. An apparatus for tracking at least one moving target with a radar device without requiring the use of Doppler information, the apparatus comprising:

a radar device for;

(i) s scanning an area with radar signals at a first time to receive a first plurality of target data signals indicative of a position of the target at the first time; and

(ii) s scanning the area with radar signals at a second time, that is different than the first time, to receive a second plurality of target data signals indicative of a position of the target at the second time; and

processing circuitry for;

(iii) determining the position of the target at the first time by collecting the first plurality of target data signals into a first target data grouping, such that the first target data grouping defines a first reference point;

(iv) determining the position of the target at the second time by collecting the second plurality of target data signals into a second target data grouping, such that the second target data grouping defines a second reference point; and

(v) comparing the position of the first reference point to the position of the second reference point to track the moving target, such that no Doppler information is required when comparing the first and second reference points.

18. An apparatus according to claim 17 wherein the processing circuitry predicts at least one future position of the moving target at a third time, that is subsequent to the first and second times, based upon the previously tracked positions of the moving target.

19. A method according to claim 18 wherein the processing circuitry compares the positions of the target at the first and second times by using the predicted future position of a moving target to correlate first and second reference points to track two or more moving targets.

20. An apparatus according to claim 17 wherein the radar device scans the area with radar signals at the first time and the second time with a continuously sweeping real beam radar signal through 360°

.

21. An apparatus according to claim 17 wherein the processing circuitry determines the position of the target at the first time and the second time by parameterizing the first and second plurality of target data signals based upon predetermined criteria to define the first and second target data groupings and the first and second reference points.

22. An apparatus according to claim 21 wherein the processing circuitry parameterizes the first and second plurality of target data signals by comparing the decibel level of the target data signals to the predetermined criteria to identify a moving target and to define the first and second reference points.

23. An apparatus according to claim 17 wherein the processing circuitry compares the positions of the target at the first and second times to eliminate target data groupings whose positions at the first and second times have changed more than a predetermined amount.

24. A computer program product for tracking at least one moving target with a radar device without requiring the use of Doppler information, the computer program product comprising a computer-readable storage medium having computer-readable program instructions stored therein, the computer-readable program portions comprising:

a first executable portion for scanning an area with radar signals at a first time to receive a first plurality of target data signals indicative of a position of the target at the first time;

a second executable portion for determining the position of the target at the first time by collecting the first plurality of target data signals into a first target data grouping, such that the first target data grouping defines a first reference point;

a third executable portion for scanning an area with radar signals at a second time, that is different than the first time, to receive a second plurality of target data signals indicative of a position of the target at the second time;

a fourth executable portion for determining the position of the target at the second time by collecting the second plurality of target data signals into a second target data grouping, such that the second target data grouping defines a second reference point; and

a fifth executable portion for comparing the position of the first reference point to the position of the second reference point to track the moving target, such that no Doppler information is required when comparing the first and second reference points.

25. A computer program product according to claim 24, further comprising a sixth executable portion for predicting at least one future position of the moving target at a third time, that is subsequent to the first and second times, based upon the previously tracked positions of the moving target wherein the second.

26. A method according to claim 25 wherein the fifth executable portion compares the positions of the target at the first and second times by using the predicted future position of a moving target to correlate first and second reference points to track two or more moving targets.

27. A computer program product according to claim 24 wherein the first and third executable portions facilitate scanning of the area with radar signals at the first time and the second time by continuously sweeping a real beam radar signal through 360°

.

28. A computer program product according to claim 24 wherein the second and fourth executable portions determine the position of the target at the first time and the second time by parameterizing the first and second plurality of target data signals based upon predetermined criteria to define the first and second target data groupings and the first and second reference points.

29. A computer program product according to claim 28 wherein the second and fourth executable portions parameterize the first and second plurality of target data signals by comparing the decibel level of the target data signals to the predetermined criteria to identify a moving target and to define the first and second reference points.

30. A computer program product according to claim 24 wherein the fifth executable portion compares the positions of the target at the first and second times to eliminate target data groupings whose positions at the first and second times have changed more than a predetermined amount.