Hi all,

Whenever I fly my P4P, it always loses gps signal mid flight. Before taking off it always gets 15+ satellites and has full gps signal strength bars. However, about 5-10 min into flight the gps signal strength will drop off to about 1 to 2 bars and the craft will switch to atti mode. For the rest of the flight it will switch back and forth every minute or 2. I thought it may be intereference in the area so I tried in different locations far apart and still similar issues. Any ideas here?

Thanks

Have you updated to the latest firmware and made the IMU & compass calibration?

HellStream Posted at 2016-12-24 12:15
Have you updated to the latest firmware and made the IMU & compass calibration?

What does IMU and compass have to do with losing gps signal?

f3honda4me Posted at 2016-12-24 20:56
What does IMU and compass have to do with losing gps signal?

My P3Pro did similar thing all the time. I did the IMU and compass calibration and problem was solved.

Tried all that. Was a bit better but still got weak gps signal and switched to atti. (maintained 20 satellites the whole time)

Within seconds this happened

What sort of area are you flying in? Are you in open country, or urban canyons with high buildings? I notice the GPS shows a good number of satellites connected, so the weak GPS signal is puzzling. IMU and compass calibration have nothing to do with the availability or strength of GPS signals.

Geebax Posted at 2016-12-24 13:31
What sort of area are you flying in? Are you in open country, or urban canyons with high buildings? I notice the GPS shows a good number of satellites connected, so the weak GPS signal is puzzling. IMU and compass calibration have nothing to do with the availability or strength of GPS signals.

Completely flat as far as the eye can see over a field. Just a small suburb nearby. I tried in this location and also about 10 km away. Also note I have flown in this area with a phantom 4 with no issues.

tydoblanko-sp Posted at 2016-12-25 07:44
Completely flat as far as the eye can see over a field. Just a small suburb nearby. I tried in this location and also about 10 km away. Also note I have flown in this area with a phantom 4 with no issues.

Then I would be making arrangements to exchange it or have it fixed by DJI, that sounds like a fault to me.

Yep sounds like a hardware issue. I'd contact DJI

I really don´t know if this helps but which frequency are you using? 2.4 or 5.8?

HellStream Posted at 2016-12-25 09:20
I really don´t know if this helps but which frequency are you using? 2.4 or 5.8?

No that has absolutely nothing to do with reception of GPS satellite signals.

there have been some K-index interference the last 3 days.
normaly nothing to worry about, but who knows.

http://www.gfz-potsdam.de/en/sec ... kp-index/quicklook/

Would you please sync your flight records through the DJI GO APP firstly?
Then please export the flight data through Assistant 2 when it happened, send an e-mail to support.us@dji.com with your APP account (e-mail address) and the exact time it happened, our engineers will help you analyze the data.

I had the same issue, flying today, but no issues in 10 previous flights in other locations.  I recalibrated IMU last night, but hadn't done a compass calibration today.  Pre-flight status was all good, per DJI Go4 app on Android.

Fiveform 2 Posted at 2016-12-26 15:02
I had the same issue, flying today, but no issues in 10 previous flights in other locations.  I recalibrated IMU last night, but hadn't done a compass calibration today.  Pre-flight status was all good, per DJI Go4 app on Android.

GPS operation does not depend on the IMU.
DJI's hardware is generally top notch so if you have a problem with loss of GPS, either there is something very anomalous about the 'clear' area you are flying or there is a fault with the GPS module. Its very unusual for that to fail but if this problem recurs in different locations, that would be the issue.

I took a look at my flight records and it seems like while GPS is acquiring satellites that the GPS "loss" is logged. I'm only seeing this at beginning and end of flights as VPS is engaged on landing.  I'll assume that is how it should work.  However, my overview of the flight log entries is that they can be a bit misleading and in many cases, superfluous.  For instance, there are also entries which state that I switched to ATTI mode when I definitely did not (could that indicate a loss of GPS, in other terminology?)
FOLLOW-UP 12-26-2016:  I took my P4P out for a 25 minute flight this morning in temps around 25 degrees F.  Tried out manual flight, as well as a few Intelligent flight modes and experienced zero issues.  In fact, handling, responsiveness, and expected behaviors were all perfect. Hopefully, many of the minor issues are a matter of familiarity and not hardware or software related.  Onward and upward!

DJI Natalia Posted at 2016-12-25 02:53
Would you please sync your flight records through the DJI GO APP firstly?
Then please export the flight data through Assistant 2 when it happened, send an e-mail with your APP account (e-mail address) and the exact time it happened, our engineers will help you analyze the data.

I reported the fight record from the dji assistant. Is that good enough or should I email as well? The flight data file is large (~400MB)

tydoblanko-sp Posted at 2016-12-27 03:06
I reported the fight record from the dji assistant. Is that good enough or should I email as well? The flight data file is large (~400MB)

There is no need all the flight data, please just export the data when the problem occurred and upload that to the dropbox.
Just to clarify, your APP e-mail address is the same for forum register, right?

DJI Natalia Posted at 2016-12-27 00:08
There is no need all the flight data, please just export the data when the problem occurred and upload that to the dropbox.
Just to clarify, your APP e-mail address is the same for forum register, right?

Yes my email is the same.

tydoblanko-sp Posted at 2016-12-28 00:31
Yes my email is the same.

Thanks, please upload the flight data as well and keep me posted, I'll transferred the data to our engineers for analysis.

DJI Natalia Posted at 2016-12-27 23:35
Thanks, please upload the flight data as well and keep me posted, I'll transferred the data to our engineers for analysis.

I already sent the data to us.support@dji.com is that good enough?

tydoblanko-sp Posted at 2016-12-29 21:44
I already sent the data to  is that good enough?

That's a great first step, could you happen to provide the ticket number for further follow up?

tydoblanko-sp Posted at 2016-12-29 21:44
I already sent the data to  is that good enough?

Sorry the correct e-mail address should be support.us@dji.com, please double check it and make sure it's sent out successfully.

DJI-Jamie Posted at 2016-12-29 22:06
That's a great first step, could you happen to provide the ticket number for further follow up?

The ticket number is 375896. Thanks!

Same happend to my brand new P4P today, gone after second flight, all went black after a short "weak gps signal" warning, then it just flew away.

DJI Natalia Posted at 2016-12-30 00:25
Sorry the correct e-mail address should be , please double check it and make sure it's sent out successfully.

I got a ticket number that i posted above. Do you have any updates?

Fiveform 2 Posted at 2016-12-25 19:39
I took a look at my flight records and it seems like while GPS is acquiring satellites that the GPS "loss" is logged. I'm only seeing this at beginning and end of flights as VPS is engaged on landing.  I'll assume that is how it should work.  However, my overview of the flight log entries is that they can be a bit misleading and in many cases, superfluous.  For instance, there are also entries which state that I switched to ATTI mode when I definitely did not (could that indicate a loss of GPS, in other terminology?)
FOLLOW-UP 12-26-2016:  I took my P4P out for a 25 minute flight this morning in temps around 25 degrees F.  Tried out manual flight, as well as a few Intelligent flight modes and experienced zero issues.  In fact, handling, responsiveness, and expected behaviors were all perfect. Hopefully, many of the minor issues are a matter of familiarity and not hardware or software related.  Onward and upward!

'For instance, there are also entries which state that I switched to ATTI mode when I definitely did not (could that indicate a loss of GPS, in other terminology?) '

It is poor wording, it is not saying you switched to ATTI mode, the aircraft is doing it automatically. This is usually in response to a compass error or perhaps a loss of GPS lock.

tydoblanko-sp Posted at 2016-12-30 17:45
The ticket number is 375896. Thanks!

Our support will take care of your case and reply your e-mail once they are back to office. Sorry for any inconvenience caused, and thanks for your support again.

DJI Natalia Posted at 2017-1-1 22:16
Our support will take care of your case and reply your e-mail once they are back to office. Sorry for any inconvenience caused, and thanks for your support again.

They emailed me saying they would send me a shipping label within 1-2 business days over a week ago and I still haven't received anything. Can you please tell me what is going on? Issue # 375896

I would be willing to wonder if there is strong magnetic forces in the ground maybe high iron? I used to have a p3s that had a bad compass module and this does seem to be quite a bit like your issue

bluemarley67 Posted at 2017-1-13 11:46
I would be willing to wonder if there is strong magnetic forces in the ground maybe high iron? I used to have a p3s that had a bad compass module and this does seem to be quite a bit like your issue

Iron ore in the ground would have no effect at altitude, and it would not affect the GPS receiver.

But it would to the compass

tydoblanko-sp Posted at 2017-1-13 07:38
They emailed me saying they would send me a shipping label within 1-2 business days over a week ago and I still haven't received anything. Can you please tell me what is going on? Issue # 375896

Very sorry for the inconvenience caused, we've reported this case to our support team, who will reply you soon.

Hi im having a similar issue with mu P4P+ did this get resolved for you? what was the conclusion. I am currently on chat with a guy who calim the drone wil return home if it looses GPS.

DJI Natalia Posted at 2017-1-16 00:36
Very sorry for the inconvenience caused, we've reported this case to our support team, who will reply you soon.

i've bought a Phantom 4 pro plus 2 months ago and since de first flight, there is the same problem. Yesterday the drone became totally crazy in the air, flying in high velocity when lost gps signal. i'm trying to contact assistance DJI in Brazil, but they tell me that they can't do nothing.

i've bought a Phantom 4 pro plus 2 months ago and since de first flight, there is the same problem. Yesterday the drone became totally crazy in the air, flying in high velocity when lost gps signal. i'm trying to contact assistance DJI in Brazil, but they tell me that they can't do nothing.

I had this same problem also last weekend, drone (P4P)kept on switcing to atti mode all the time even tere was plenty of satellites, the drone was drifting and almost impossible to fly straight line, the the gps came back and in couple of minutes it went back to atti, this was happening many times untill I lost connection to the drone completely, "aircraft disconnected", luckily the connection.came back in about 30 seconds  and I was able to fly it back manually. the temperature was around 0 degrees celcius.

Happens to me constantly.  I have flown  on different areas and the problem keeps coming.  The real problem is that it cancels the RTH and you have to fly back manually.  I have upgraded to the new firmware and the problem appeared again.

Gulars Posted at 2017-2-13 06:42
Hi im having a similar issue with mu P4P+ did this get resolved for you? what was the conclusion. I am currently on chat with a guy who calim the drone wil return home if it looses GPS.

'I am currently on chat with a guy who calim the drone wil return home if it looses GPS.'

He is totally wrong. If the aircraft cannot receive GPS data, it cannot RTH, as it needs the GPS data to know where home is.