Locally positioned EM tracker

1. A user console for a surgical robotic system, comprising:

a seat having armrests and a backrest;

a display in front of the seat; and

a plurality of electromagnetic (EM) transmitters configured to generate an EM tracking space envelope between the armrests, the backrest, and the display.

2. The user console of claim 1 , wherein the plurality of EM transmitters includes one or more armrest EM transmitters mounted on respective free ends of the armrests to generate respective EM fields localized around the free ends in the EM tracking space envelope.

3. The user console of claim 2 further comprising a boom mounted on one of the armrests, wherein the boom is movable relative to the armrests, and wherein one of the one or more armrest EM transmitters are mounted on the boom.

4. The user console of claim 1 , wherein the plurality of EM transmitters includes a backrest EM transmitter mounted on the backrest to generate a respective EM field in the EM tracking space envelope in front of the backrest.

5. The user console of claim 1 further comprising a stand on which the display is supported; and

wherein the plurality of EM transmitters includes a stand EM transmitter mounted on the stand to generate a respective EM field in the EM tracking space envelope in front of the seat.

6. The user console of claim 5 , wherein the stand EM transmitter is positioned at a height above the ground on which the stand is to rest that is closer to the bottom of the display than to the ground.

7. The user console of claim 1 , wherein the plurality of EM transmitters includes a display EM transmitter mounted on the display to generate a respective EM field in the EM tracking space envelope in front of the seat.

8. The user console of claim 7 , wherein the display EM transmitter is mounted closer to the bottom of the display than to the top of the display.

9. The user console of claim 1 further comprising a user input device (UID) having an EM sensor within a housing to generate a spatial state signal in six degrees of freedom that is responsive to the EM tracking space envelope while the UID is being held in a hand of an operator and is located within the EM tracking space envelope.

10. A surgical robotic system, comprising:

a robotic arm including an actuator;

a user console including a seat having armrests and a backrest, a display in front of the seat, and a plurality of electromagnetic (EM) transmitters configured to generate an EM tracking space envelope between the armrests, the backrest, and the display;

a user input device (UID) having a housing and an EM sensor within a housing to generate a spatial state signal in six degrees of freedom that is responsive to the EM tracking space envelope; and

a control system including one or more processors configured to generate control commands to drive the actuator based on the spatial state signal.

11. The surgical robotic system of claim 10 , wherein the plurality of EM transmitters includes one or more armrest EM transmitters mounted on respective free ends of the armrests to generate respective EM fields localized around the free ends in the EM tracking space envelope.

12. The surgical robotic system of claim 11 further comprising a boom mounted on one of the armrests, wherein the boom is movable relative to the armrests, and wherein one of the one or more armrest EM transmitters are mounted on the boom.

13. The surgical robotic system of claim 10 , wherein the plurality of EM transmitters includes a backrest EM transmitter mounted on the backrest to generate a respective EM field in the EM tracking space envelope in front of the backrest.

14. The surgical robotic system of claim 10 further comprising a stand on which the display is supported; and

wherein the plurality of EM transmitters includes a stand EM transmitter mounted on the stand to generate a respective EM field in the EM tracking space envelope in front of the seat.

15. The surgical robotic system of claim 10 , wherein the plurality of EM transmitters includes a display EM transmitter mounted on the display to generate a respective EM field in the EM tracking space envelope in front of the seat.

16. A non-transitory computer-readable medium storing instructions which, when executed by one or more processors of a surgical robotic system, cause the surgical robotic system to perform a method, comprising:

generating, by a plurality of electromagnetic (EM) transmitters of a user console of the surgical robotic system, an EM tracking space envelope between armrests of a seat, a backrest of the seat, and a display in front of the seat;

generating, by a user input device (UID) having an EM sensor within a housing, a spatial state signal in six degrees of freedom that is responsive to the EM tracking space envelope; and

generating control commands to drive an actuator of the surgical robotic system based on the spatial state signal.

17. The non-transitory computer-readable medium of claim 16 , wherein the plurality of EM transmitters includes one or more armrest EM transmitters mounted on respective free ends of the armrests to generate respective EM fields localized around the free ends in the EM tracking space envelope.

18. The non-transitory computer-readable medium of claim 16 , wherein the plurality of EM transmitters includes a backrest EM transmitter mounted on the backrest to generate a respective EM field in the EM tracking space envelope in front of the backrest.

19. The non-transitory computer-readable medium of claim 16 further comprising a stand on which the display is supported; and

wherein the plurality of EM transmitters includes a stand EM transmitter mounted on the stand to generate a respective EM field in the EM tracking space envelope in front of the seat.

20. The non-transitory computer-readable medium of claim 16 , wherein the plurality of EM transmitters includes a display EM transmitter mounted on the display to generate a respective EM field in the EM tracking space envelope in front of the seat.