Antenna positioner with eccentric tilt position mechanism
Methods, systems, and devices are described for antenna positioning with an eccentric tilt pointing mechanism. For example, a system in accordance with the present disclosure may include a base structure and an intermediate structure that is rotatably coupled with the base structure about a first axis (e.g., a tilt axis). The system may also include a positioning system that is coupled with the intermediate structure and configured to orient an antenna boresight about at least two angular degrees of freedom with respect to the intermediate structure (e.g., in an elevation-over-azimuth configuration). The system may also include an actuator between the base structure and the intermediate structure that is configured to set, change, or maintain an angle between the base structure and the intermediate structure, which, in some examples, may include a rotation of an eccentric element based on a predicted path of a target device.
1. A system, comprising:
a structure configured to pivot about a pivot axis and comprising a contact point at a location different than the pivot axis;
a positioning system coupled with the structure and configured to track movement, of an object moving along an object path, about at least two angular degrees of freedom relative to the structure that are separate from the pivot axis; and
an actuator configured to pivot the structure about the pivot axis, the actuator comprising:
a linkage coupled with the structure at a location offset from the pivot axis; and
a drive element configured to move the linkage and cause a change in relative angle between the structure and a base about the pivot axis in response to movement of the linkage, wherein the change in relative angle between the structure and the base is limited at a first angle by a physical contact between the contact point of the structure and the base.
2. The system of claim 1 , wherein the linkage is coupled with the structure via a compliant element.
3. The system of claim 2 , wherein the compliant element is configured to store a preload based at least in part on a displacement of the drive element while the change in relative angle between the structure and the base is limited at the first angle by the physical contact between the contact point of the structure and the base.
4. The system of claim 1 , wherein the change in relative angle between the structure and the base is limited at a second angle by a physical contact between a second contact point of the structure, at a different location than the contact point, and the base.
5. The system of claim 1 , further comprising:
a control system configured to control the actuator based at least in part on a predicted path of the object.
6. The system of claim 5 , wherein the control system is configured to:
determine whether to actuate the drive element or to hold the drive element based at least in part on a predicted portion of the object path.
7. The system of claim 5 , wherein the control system is configured to:
control the drive element to maintain the physical contact between the contact point of the structure and the base; and
control the positioning system to track the movement of the object along the object path while maintaining the physical contact between the contact point of the structure and the base.
8. The system of claim 1 , further comprising:
a control system configured to control the actuator based at least in part on a predicted position of a target device relative to the system.
9. The system of claim 1 , wherein the positioning system comprises:
an elevation positioner; and
an azimuth positioner between the elevation positioner and the structure.
10. A system, comprising:
a structure configured to pivot about a pivot axis;
a positioning system coupled with the structure and configured to track movement, of an object moving along an object path, about at least two angular degrees of freedom relative to the structure that are separate from the pivot axis;
an actuator configured to pivot the structure about the pivot axis, the actuator comprising:
a linkage coupled with the structure at a location offset from the pivot axis; and
a drive element configured to move the linkage and cause a change in relative angle between the structure and a base about the pivot axis in response to movement of the linkage; and
a control system configured to cause the system to:
actuate the drive element, before tracking movement of the object using the positioning system, to establish a first angle between the structure and the base about the pivot axis based at least in part on a predicted path of the object;
control the drive element to maintain the first angle between the structure and the base about the pivot axis; and
control the positioning system to track the movement of the object along the object path while maintaining the first angle between the structure and the base about the pivot axis.
11. The system of claim 10 , wherein the control system is configured to cause the system to:
actuate the drive element to establish the first angle between the structure and the base about the pivot axis based at least in part on a separation between the predicted path of the object and a positioning axis of the positioning system.
12. The system of claim 10 , wherein the change in relative angle between the structure and the base is limited at the first angle by a physical contact between a contact point of the structure and the base.
13. The system of claim 12 , wherein the linkage is coupled with the structure via a compliant element that is configured to store a preload based at least in part on a displacement of the drive element while the change in relative angle between the structure and the base is limited at the first angle by the physical contact between the contact point of the structure and the base.
14. The system of claim 12 , wherein the change in relative angle between the structure and the base is limited at a second angle by a second physical contact between a second contact point of the structure, at a different location than the contact point, and the base.
15. The system of claim 10 , wherein the positioning system comprises: an elevation positioner; and an azimuth positioner between the elevation positioner and the structure.
16. A system, comprising:
a structure configured to pivot about a pivot axis;
a positioning system coupled with the structure and configured to track movement of an object while moving along an object path, the positioning system comprising:
a first positioner associated with positioning about a first positioning axis that is perpendicular to the pivot axis; and
a second positioner associated with positioning about a second positioning axis that is perpendicular to the first positioning axis, the first positioner being between the second positioner and the structure; and
an actuator configured to pivot the structure about the pivot axis, the actuator comprising:
a linkage coupled with the structure at a location offset from the pivot axis; and
a drive element configured to move the linkage and cause a change in relative angle between the structure and a base about the pivot axis in response to movement of the linkage.
17. The system of claim 16 , further comprising:
a control system configured to control the actuator based at least in part on a separation between a predicted path of the object and the first positioning axis.
18. The system of claim 17 , wherein the control system is configured to:
actuate the drive element based at least in part on the separation between the predicted path of the object and the first positioning axis exceeding a threshold; and
hold the drive element based at least in part on the separation between the predicted path of the object and the first positioning axis being below the threshold.
19. The system of claim 16 , wherein the change in relative angle between the structure and the base is limited at an angle by a physical contact between a contact point of the structure and the base.
20. The system of claim 12 , wherein the linkage is coupled with the structure via a compliant element that is configured to store a preload based at least in part on a displacement of the drive element while the change in relative angle between the structure and the base is limited at the first angle by the physical contact between the contact point of the structure and the base.