Granted Patent B2

US 12,231,330 · App. 18/237,317 · Granted Feb 18, 2025

Inventors: Eric J. Loren (North Liberty, IA); William B. Sorsby (Cedar Rapids, IA); Tj T. Kwon (Marion, IA); James A. Stevens (Lucas, TX); Joseph T. Graf (Center Point, IA); Steven V. Schatz (Cedar Rapids, IA); Matthew D. Bousselot (Marion, IA); Philip D. Dean (Lisbon, IA)

Assignee: Rockwell Collins, Inc.

H04L45/42G01S5/0027G01S13/583G01S13/62H04L45/02H04L45/123H04L45/32H04W56/0015H04W56/0035H04W56/005

Abstract

Claims (29)

1. A system, comprising:

a transmitter node and a receiver node, wherein each node of the transmitter node and the receiver node comprises:

a communications interface including at least one antenna element; and

a controller operatively coupled to the communications interface, the controller including one or more processors, wherein the controller of the receiver node has information of own node velocity and own node orientation;

wherein the receiver node is in motion and the transmitter node is stationary,

wherein each node of the transmitter node and the receiver node are time synchronized to apply Doppler corrections associated with said node's own motions relative to a common reference frame,

wherein the common reference frame is known to the transmitter node and the receiver node prior to the transmitter node transmitting signals to the receiver node and prior to the receiver node receiving the signals from the transmitter node.

2. The system of claim 1 , wherein the common reference frame is a common inertial reference frame.

3. The system of claim 2 , wherein the common inertial reference frame is in motion.

4. The system of claim 1 , wherein the receiver node is configured to adjust a receiver frequency of the receiver node according to an own speed and an own velocity direction of the receiver node so as to perform a receiver-side Doppler correction.

5. The system of claim 4 , wherein an amount of adjustment of the adjusted receiver frequency is proportional to a receiver node velocity projection onto a Doppler null direction.

6. The system of claim 5 , wherein the receiver node is configured to determine a relative speed between the transmitter node and the receiver node.

7. The system of claim 6 , wherein a maximum net frequency shift for a Doppler correction by the receiver node occurs when a resultant vector is parallel to the Doppler null direction, wherein the resultant vector is equal to a velocity vector of the receiver node minus the velocity vector of the transmitter node.

8. The system of claim 6 , wherein a minimum net frequency shift for a Doppler correction by the receiver node occurs when a resultant vector is antiparallel to the Doppler null direction, wherein the resultant vector is equal to a velocity vector of the receiver node minus the velocity vector of the transmitter node.

9. The system of claim 6 , wherein a net frequency shift for a Doppler correction by the receiver node is zero when a vector pointing to the receiver node from the transmitter node is parallel to the Doppler null direction.

10. The system of claim 1 , wherein the transmitter node and the receiver node are time synchronized via synchronization bits associated with acquisition.

11. The system of claim 10 , wherein the synchronization bits operate as physical layer overhead.

12. The system of claim 1 , wherein the receiver node is in motion in three dimensions.

13. The system of claim 1 , wherein the receiver node is in motion in two dimensions.

14. The system of claim 1 , wherein the system is a mobile ad-hoc network (MANET) comprising the transmitter node and the receiver node.

15. A method, comprising:

providing a transmitter node and a receiver node, wherein each node of the transmitter node and the receiver node are time synchronized, wherein the receiver node is in motion and the transmitter node is stationary, wherein each node of the transmitter node and the receiver node comprises a communications interface including at least one antenna element, wherein each node of the transmitter node and the receiver node further comprises a controller operatively coupled to the communications interface, the controller including one or more processors, wherein the controller of the receiver node has information of own node velocity and own node orientation; and

based at least on the time synchronization, applying, by the receiver node, Doppler corrections to the receiver node's own motions relative to the common reference frame;

wherein the common reference frame is known to the transmitter node and the receiver node prior to the transmitter node transmitting signals to the receiver node and prior to the receiver node receiving the signals from the transmitter node.

16. The method of claim 15 , further comprising: adjusting, by the receiver node, a receiver frequency of the receiver node according to an own speed and an own velocity direction of the receiver node so as to perform a receiver-side Doppler correction.

17. The method of claim 16 , wherein an amount of adjustment of the adjusted receiver frequency is proportional to a receiver node velocity projection onto the Doppler null direction.

18. The method of claim 15 , further comprising: determining, by the receiver node, a relative speed between the transmitter node and the receiver node.

19. The method of claim 15 , wherein the receiver node is in motion in three dimensions.

20. The method of claim 15 , wherein the receiver node is in motion in two dimensions.

Assignments (1)

Continuity (13)

References Cited (343)