Tracking control device of antenna loaded on movable body and tracking control method of the antenna

• US 5,629,709 A
• Filed: 11/01/1994
• Issued: 05/13/1997
• Est. Priority Date: 11/02/1993
• Status: Expired due to Term

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Yamashita, Toshiaki
• Primary Examiner(s): Issing, Gregory C.
• Application Number:
  US08/333,046
• Time in Patent Office: 924 Days
• Field of Search: 342/359, 342/75, 342/77, 343/757
• US Class Current: 342/359
• CPC Class Codes: H01Q 1/1257 using the received signal strength
• CPC Class Codes: H01Q 1/3233 particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
• CPC Class Codes: H01Q 3/10 to produce a conical or spiral scan

Abstract

An antenna tracking control device includes detectors for detecting speed and the steering angle of a movable body, a device for calculating the estimated azimuth angle of the movable body based on the detected speed and steering angle, and a detector for detecting the azimuth angle of the movable body. Also, an azimuth angle error estimator is provided for calculating the error between the calculated estimated azimuth angle and the detected azimuth angle. In addition, a directing angle error detector is used for detecting antenna directing angle error, and a directing angle error corrector is used for correcting the detected antenna directing angle error, with the result that the antenna tracking control device causes an antenna mounted on a moveable body, such as an automobile, to track a wave generating source based on the corrected antenna directing angle error.

Claims

1. A tracking control device for an antenna disposed on a movable body so as to track a wave generating source, said tracking control device comprising:

a speed detection means for detecting a speed of said movable body;

a steering angle detection means for detecting a steering angle of said movable body;

an estimated azimuth angle calculation means for calculating an estimated azimuth angle of said movable body, based on the speed detected by said speed detection means and the steering angle detected by said steering angle detection means;

an azimuth angle detection means for detecting an azimuth angle of said movable body;

an error calculation means for calculating an error between said estimated azimuth angle calculated by said estimated azimuth angle calculation means and said azimuth angle detected by said azimuth angle detection means;

a directing angle error detection means for detecting an antenna directing angle error; and

a correction means for correcting said antenna directing angle error, based on said error calculated by said error calculation means.

2. The tracking control device of claim 1, wherein said speed detection means detects an advancing speed of said movable body.

3. The tracking control device of claim 1, wherein said estimated azimuth angle calculation means calculates azimuth angle speed of said movable body based on said speed detected by said speed detection means and said steering angle detected by said steering angle detection means and calculates said estimated azimuth angle of said movable body by integrating said azimuth angle speed.

4. The tracking control device of claim 3, wherein said estimated azimuth angle calculation means calculates azimuth angle speed ω

of said movable body by the following equation,

space="preserve" listing-type="equation">ω

=(v/L)tan α

,

where v is speed of said movable body, α

is a steering angle of said movable body, L is a distance between an axle of said movable body and the location of said antenna, and ω

is an azimuth angle speed of said movable body, and integrates said azimuth angle speed ω

of said movable body for a preset time and calculates said estimated azimuth angle of said movable body.

5. The tracking control device of claim 1, wherein said error calculation means outputs a difference between said estimated azimuth angle calculated by said estimated azimuth angle calculation means and said azimuth angle detected by said azimuth angle detection means as an error.

6. The tracking control device of claim 1, wherein said correction means calculates an arithmetical mean of said error calculated by said error calculation means and said directing angle error of said antenna.

7. The tracking control device of claim 1, wherein said correction means calculates a weighted mean of said error calculated by said error calculation means and said directing angle error of said antenna.

8. A tracking control device for an antenna disposed on a movable body so as to track a wave generating source, said tracking control device comprising:

a speed detection means for detecting an advancing speed of said movable body;

a steering angle detection means for detecting a steering angle of said movable body;

an estimated azimuth angle calculation means for calculating an estimated azimuth angle of said movable body by calculating azimuth angle speed of said movable body based on said advancing speed detected by said speed detection means and said steering angle detected by said steering angle detection means and by integrating said azimuth angle speed;

an azimuth angle detection means for detecting an azimuth angle of said movable body;

an error calculation means for outputting a difference between said estimated azimuth angle calculated by said estimated azimuth angle calculation means and said azimuth angle detected by said azimuth angle detection means as an error;

a directing angle error detection means for detecting an antenna directing angle error; and

a correction means for correcting said antenna directing angle error, based on said error calculated by said error calculation means.

9. The tracking control device of claim 8, wherein said estimated azimuth angle calculation means calculates azimuth angle speed ω

of said movable body by the following equation,

space="preserve" listing-type="equation">ω

=(v/L)tan α

,

where v is speed of said movable body, α

is a steering angle of said movable body, L is a distance between an axle of said movable body and the location of said antenna, and ω

is azimuth angle speed of said movable body, and integrates said azimuth angle speed ω

of said movable body for a preset time and calculates said estimated azimuth angle of said movable body.

10. The tracking control device of claim 8, wherein said correction means is configured so as to calculate an arithmetical mean of said error calculated by said error calculation means and said directing angle error of said antenna.

11. The tracking control device of claim 8, wherein said correction means calculates a weighted mean of said error calculated by said error calculation means and said directing angle error of said antenna.

12. A tracking control method for an antenna disposed on a movable body so as to track a wave generating source, comprising:

(a) detecting a speed and a steering angle of said movable body;

(b) estimating an azimuth angle of said movable body, based on the detected speed and steering angle;

(c) detecting an azimuth angle of said movable body;

(d) calculating an error between the estimated azimuth angle and the detected azimuth angle;

(e) detecting an antenna directing angle error; and

(f) correcting the detected antenna directing angle error, based on said error between said estimated azimuth angle and said detected azimuth angle.

13. The tracking control method of claim 12, wherein step (f) is a step to calculate a weighted mean of said azimuth angle error calculated in step (d) and said antenna directing angle error detected in step (e).

14. The tracking control device of claim 12, wherein step (b) is a step to estimate the azimuth angle of said movable body by calculating azimuth angle speed of said movable body and integrating said azimuth angle speed, based on said speed and said steering angle detected in step (a).

15. The tracking control method of claim 12, wherein step (b) is a step to calculate an azimuth angle speed ω

of said movable body by the following equation,

space="preserve" listing-type="equation">ω

=(v/L)tan α

,

where v is speed of said movable body, α

is a steering angle of said movable body, L is a distance between an axle of said movable body and the location of said antenna, and ω

is an azimuth angle speed of said movable body, and integrate the azimuth angle speed ω

of said movable body for a preset time and estimate said azimuth angle of said movable body.

16. The tracking control method of claim 12, wherein step (d) is a step to calculate a difference between said azimuth angle estimated in step (b) and said azimuth angle detected in step (c) as an error of said azimuth angle.

17. The tracking control method of claim 12, wherein step (f) is a step to calculate an arithmetical mean of said azimuth angle error calculated in step (d) and said antenna directing angle error detected in step (e).

18. A tracking control device for an antenna disposed on a movable body so as to track a wave generating source, said tracking control device comprising:

a speed detector to detect a speed of a movable body;

a steering angle detector to detect a steering angle of said movable body;

an azimuth angle estimator to calculate an estimated azimuth angle of said movable body, based on the speed detected by said speed detector and the steering angle detected by said steering angle detector;

an azimuth angle detector to detect an azimuth angle of said movable body;

an azimuth angle error estimator to calculate an error between said estimated azimuth angle calculated by said azimuth angle estimator and said azimuth angle detected by said azimuth angle detector;

an antenna directing angle error detector to detect an antenna directing angle error; and

an antenna directing angle error corrector to correct said antenna directing angle error, based on said error calculated by said azimuth angle error estimator.

19. The tracking control device of claim 18, wherein said speed detector detects a speed of said movable body.

20. The tracking control device of claim 18, wherein said azimuth angle estimator calculates azimuth angle speed of said movable body based on said speed detected by said speed detector and said steering angle detected by said steering angle detector and calculates said estimated azimuth angle of said movable body by integrating said azimuth angle speed.

21. The tracing control device of claim 20, wherein said azimuth angle estimator calculates azimuth angle speed ω

of said movable body by the following equation,

space="preserve" listing-type="equation">ω

=(v/L)tan α

,

where v is speed of said movable body, ω

is a steering angle of said movable body, L is a distance between an axle of said movable body and the location of said antenna, and ω

is an azimuth angle speed of said movable body, and integrates said azimuth angle speed ω

of said movable body for a preset time and calculates said estimated azimuth angle of said movable body.

22. The tracking control device of claim 18, wherein said azimuth angle error estimator outputs a difference between said estimated azimuth angle calculated by said azimuth angle estimator and said azimuth angle detected by said azimuth angle detector as an error.

23. The tracking control device of claim 18, wherein said antenna directing angle error corrector calculates an arithmetical mean of said error calculated by said azimuth angle error estimator and said directing angle error of said antenna.

24. The tracking control device of claim 18, wherein said antenna directing angle error corrector calculates a weighted mean of said error calculated by said azimuth angle error estimator and said directing angle error of said antenna.

25. A tracking control device for an antenna disposed on a movable body so as to track a wave generating source, said tracking control device comprising:

a speed detector to detect an advancing speed of said movable body;

a steering angle detector to detect a steering angle of said movable body;

an azimuth angle estimator to calculate an estimated azimuth angle of said movable body by calculating azimuth angle speed of said movable body based on said speed detected by said speed detector and said steering angle detected by said steering angle detector and by integrating said azimuth angle speed;

an azimuth angle detector to detect an azimuth angle of said movable body;

an azimuth angle error estimator to output a difference between said estimated azimuth angle calculated by said azimuth angle estimator and said azimuth angle detected by said azimuth angle detector as an error;

an antenna directing angle error detector to detect an antenna directing angle error; and

an antenna directing angle error corrector to correct said antenna directing angle error, based on said error calculated by said azimuth angle error estimator.

26. The tracking control device of claim 25, wherein said azimuth angle estimator calculates azimuth angle speed ω

of said movable body by the following equation;

space="preserve" listing-type="equation">ω

=(v/L)tan α

,

where v is speed of said movable body, α

is a steering angle of said movable body, L is a distance between an axle of said movable body and the location of said antenna, and ω

is azimuth angle speed of said movable body, and integrates said azimuth angle speed ω

of said movable body for a preset time and calculates said estimated azimuth angle of said movable body.

27. The tracking control device of claim 25, wherein said antenna directing angle error corrector is configured so as to calculate an arithmetical mean of said error calculated by said azimuth angle error estimator and said directing angle error of said antenna.

28. The tracking control device of claim 25, wherein said antenna directing angle error corrector calculates a weighted mean of said error calculated by said azimuth angle error estimator and said directing angle error of said antenna.