Here3+ GPS No Fix Issue - Need Assistance

ArduCopter
1

Hello,

I am experiencing an issue with my Here3+ GNSS module where it fails to obtain a fix despite being outdoors with a clear view of the sky. I have already ensured that my firmware is up to date, and I have taken several troubleshooting steps, including:

  1. Verified all connections are secure and undamaged.
  2. Confirmed the GPS configuration in the flight controller software (Mission Planner/QGroundControl) is correct.
  3. Tried connecting the GPS module to a different port on the flight controller.
  4. Ensured there are no sources of RF interference nearby.
  5. Performed a fresh compass calibration.
  6. Verified that the GPS antenna is not damaged and properly connected.

Despite these efforts, the GPS module still does not obtain a fix.
Here are some additional details:

  • Model: Here3+
  • Flight Controller: [cube orange plus with arducopter 4.5.4 firmware]
    Thank you in advance for your help!

Best regards,
Muthuswaminathan

2

Hi @MUTHUSWAMINATHAN_S ! Have you followed the steps and set the correct parameters as mentioned here: Here 3 Manual | CubePilot ?

1 Like
3

Yes, i set the params as mentioned in the manual
CAN_D1_PROTOCOL: 1
CAN_D2_PROTOCOL: 1
CAN_P1_DRIVER: 1
CAN_P2_DRIVER: 1
GPS_TYPE: 9
NTF_LED_TYPES: 231
BRD_SAFETYENABLE as 0

I have attached the param file in this drive
https://drive.google.com/drive/folders/1uCWxsqCBDeqID7_EIsjDr_VzP3sXXimj

5

“No fix” means that configuration is likely correct, but there is no navigation solution. Wait at least 15 minutes outside, powered on, before declaring there’s a problem.

1 Like
6

Thankyou for the reply, yes i have waited in the outdoor with clear sky for around 20 mins. No satellites connected (it shows 0 sats)

7

@Yuri_Rage what might be problem bro? I could not solve this problem.
Your help is greatly appreciated

8

I think you should contact CubePilot. It sounds like a hardware failure.

9

I suggest to use u-center to check GPS unit first.

And do the following comparsion tests:

a. GPS with clean serial adapter power + u-center
b. GPS with quad copter power + u-center
c. GPS with quad copter power + GCS/RC

Note: Should be at the same location, during the same time period, with the same GPS module, and with the same copter.

10

While those aren’t bad ideas, you’ll need to use serial passthrough on the autopilot to connect the Here3 to u-Center. There is no direct serial connection exposed.

11

how to contact cubepilot. i can’t find support mail of cubepilot. please share if you have

12

okay thanks for this tip

13

thankyou for your reply @lida2003. i don’t have external serial adapter. so, as per advise given by @Yuri_Rage i connected my here3+ to u-center by setting the pass through parameter to 1 enabled the serial passthrough.

Screenshot 2024-07-28 172029
Screenshot 2024-07-28 1720291920Ă—1080 273 KB

and in u-center i connected by network connection with the address tcp://127.0.0.1:500. i think it was connected successfully but i can’t see much info in monitor.
Screenshot 2024-07-28 171209
Screenshot 2024-07-28 1712091920Ă—1080 227 KB

what to do?

14

If you have successfully got hardware connected, then we have to make configuration properly.

I don’t have CAN-GPS, so we have to follow the CAN-PassThrough guide. Maybe you have to try and adjust to make it work.

If we have got passthrough working, then we can see those packet. Just follow the u-center guide and find out what’s the problem.

图片
图片1829×995 186 KB