Method of optimizing the coverage area of a sensor

• US 6,297,763 B1
• Filed: 12/22/1998
• Issued: 10/02/2001
• Est. Priority Date: 12/23/1997
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Thomson, Ola, Bentland, Benny
• Primary Examiner(s): Gregory, Bernarr E.
• Application Number:
  US09/218,169
• Time in Patent Office: 1,015 Days
• Field of Search: 342/23, 342/24, 342/25, 342/27-41, 342/73-81, 342/165, 342/175, 342/176, 342/184, 342/195, 342/26, 342/161, 342/205, 342/147-158, 342/368-377
• US Class Current: 342/75
• CPC Class Codes: G01S 13/42 Simultaneous measurement of distance and other co-ordinates indirect measurement G01S13/46
• CPC Class Codes: G01S 13/89 for mapping or imaging

Abstract

A method is provided of optimizing, within an area which itself contains a number of part areas, the coverage of a sensor which has an angle-dependent range in a least one plane, and which sensor is in addition arranged on a mobile platform. The method includes determining at least two movement directions for the sensor platform, determining a center of movement for the two movement directions, and also determining periods of time during which the sensor platform is to move in each of the two movement directions. The center of movement of the platform is preferably located within the search area.

Claims

1. Method of optimizing a coverage area of a sensor, within an area that contains a number of part areas, the sensor having an angle-dependent range in at least one plane and being arranged on a mobile sensor platform, the method comprising the following steps:

determining at least two movement directions for the sensor platform such that the angle between the sensor and the at least one plane is substantially constant as the sensor platform travels along each of the at least two movement directions;

determining a center of movement for said two movement directions;

determining periods of time for moving the sensor platform in each of said two movement directions, wherein the movement directions, the center of movement and the periods of time are determined so that the sum of the differences between the desired range and the achieved range in azimuth of the sensor is minimized; and

adapting the coverage area of the sensor to a given search area.

2. Method according to claim 1, wherein the center of movement is located within the said area.

3. Method according to claim 1, wherein said two movement directions form a closed contour, said center of movement forming the center point of the contour.

4. Method according to claim 3, wherein the part areas forming part of said area are assigned weighting factors for use in the minimization.

5. Method according to claim 4, wherein the sensor is a passive sensor.

6. Method according to claim 1, wherein the sensor is an active sensor.

7. Method according to claim 6, wherein the active sensor is a radar system.

8. Method according to claim 1, wherein it is applied to a sensor with a range which is symmetrical at least in the plane in which the range of the sensor is angle-dependent, and which sensor is arranged on a mobile sensor platform, the main movement of which takes place in the plane in which the range of the sensor is symmetrical.

9. Method according to claim 1, wherein it is used in a sensor platform formed by an aircraft.

10. Method according to claim 1, wherein it is used in a sensor platform formed by a ship.

11. Method according to claim 1, wherein it is used in a sensor platform formed by a land vehicle.

12. Method according to claim 1, wherein each of the at least two movement directions is substantially linear.

13. Method of optimizing a coverage area of a sensor, within an area that contains a number of part areas, the sensor having an angle-dependent range in at least one plane and being arranged on a mobile sensor platform, the method comprising the following steps:

assigning weighting factors to at least some of the number of part areas;

determining at least two movement directions for the sensor platform wherein the at least two movement directions form a closed contour;

determining a center of movement for said two movement directions wherein the center of movement forms the center point of the contour;

determining periods of time for moving the sensor platform in each of said two movement directions, wherein the movement directions, the center of movement and the periods of time are determined so that the sum of the differences between the desired range and the achieved range in azimuth of the sensor is minimized and wherein the desired range is determined using the weighting factors assigned to at least some of the number of part areas; and

adapting the coverage area of the sensor to a given search area.

14. Method of optimizing a coverage area of a passive sensor, within an area that contains a number of part areas, the passive sensor having an angle-dependent range in at least one plane and being arranged on a mobile sensor platform, the method comprising the following steps:

determining at least two movement directions for the sensor platform wherein the at least two movement directions form a closed contour;

determining a center of movement for said two movement directions wherein the center of movement forms the center point of the contour;

determining periods of time for moving the sensor platform in each of said two movement directions, wherein the movement directions, the center of movement and the periods of time are determined so that the sum of the differences between the desired range and the achieved range in azimuth of the passive sensor is minimized; and

adapting the coverage area of the passive sensor to a given search area.