R12i as a Rover using RTK & Infill - IMU must be disabled

1) It's not an issue. Read the literature for the R12i.

2) Disable the IMU (in your chosen Survey Style) & use your R12i like before.

The "tilt" feature (IMU) is only applicable to RTK shots, by design.

You are trying to use it incorrectly.

Once you've "started a survey style", those settings are locked in.

When enabled, the IMU is always on, even during loss of data link.

Because you have RTK selected AND the tilt (IMU) enabled for topo shots, the survey style tells the GNSS not to disable the IMU. 

Data Logging / PPK does not work with tilt (IMU).

When you attempt a PPK observation with IMU enabled, you are telling the machine to do something it is incapable/was never designed to do.

Just check the box in access that turns off the IMU?

I can't imagine this would be a reason to leave the R12i in the office. 

While I don't see a problem switching from RTK to PPK style, since I have to initialize in any case, I would think the Access team could build in an automatic IMU shutoff during an Infill situation.

It's already implemented for the Observed Control Point type within typical RTK surveys, so clearly it can be done under certain circumstances.

While I don't see a problem switching from RTK to PPK style, since I have to initialize in any case, I would think the Access team could build in an automatic IMU shutoff during an Infill situation.

The problem is that it is not possible to post calculate the tilt correction.

The quick solution has been to disallow tilt correction in any survey style that allows logging.

The receiver gets told to turn Tilt correction off.

You can see the difference in the Rover options between RTK and RTK&Logging styles.

@jimcox

The problem is that it is not possible to post calculate the tilt correction.

For sure, that's easy to understand, but in this case the goal would be to ignore tilt corrections as soon as the user switches to PP mode, immediately prior to initialization. I wouldn't want to try to post-calc tilt, and I don't think Joel is looking to do that either.

The receiver switches to a converging APC solution on the fly during an RTK survey for observed control points, even when the IMU is enabled - surely it is possible to just log raw GNSS data during an infill session?

It makes perfect sense to require tilt be disabled during RTK + Logging sessions.

But since operation in Infill mode entails no RTK solution by definition, I would think there should be no concern with simply ignoring/turning off the IMU at that time.

@rover83 

I would agree - but the possibility that someone would unknowingly continue surveying still using the pole on an angle is regarded as too big a risk of getting bad numbers in the job

it's kind of like leaving the gust lock in place while taxiing and then rolling out for take off....

should have done a more thorough preflight....

the devices can't be expected to do everything....at some point someone can write a procedure and train people....ftlog...

carry on.

drafting all day is taking a toll finally...

@jitterboogie

the devices can't be expected to do everything....at some point someone can write a procedure and train people....ftlog...

Yeah, I can't say I disagree with Jim, even though I agree with Joel about having the option to seamlessly transition from RTK+IMU to PPK without IMU.

Flexibility and customizability are absolutely crucial in my opinion, but that means that your staff have to be not only well trained in the basics, but also in the understanding of what it means when they push this button rather than that button. Checklists can only go so far.

@rover83 

yep.

well, maybe too far in regards to that rampy that took Q400 out for it's final flight. That's a bit more than just push this button...

lol.

it's a continuum for sure.

I would agree - but the possibility that someone would unknowingly continue surveying still using the pole on an angle is regarded as too big a risk of getting bad numbers in the job

We are adults now and don't need a Nanny anymore.

Jim Cox post is correct.  The RTK&Infill survey style is, on the R12i a PPK only solution.  I'm quite familiar with this survey style, since it remains essential, or it was prior to the R12i as a rover in remote locations when Radio Link is down.  Happens all the time to me, and I think I represent a pretty large pool of R12i users across our National Parks.  Yes, we can switch survey styles, but try doing that several times in a job.  Not fun.   Tapping IMU on off btw is not possible with the RTK&Infill style engaged.

Our users are willing to go bubble level and keep working without tilt correction.  That's a workflow we are well versed in.

Were also well versed in intermittent RTK, and the vagaries of intermittent cellular mobile broadband in the deep recesses of our National Parks.  

Two years ago, I thought I was missing something.  I'm just asking for an improvement and a reasonable "re-enhancement" by the Access team to require tilt to be disabled at switch to PP infill, and more importantly re-engage tilt functionality when RTK returns.

depending on the sky, and nowadays with like a million satellites, you can take a static shot with a few minutes as long as you're using a base and not the vrs model.  it's actually a great way to extend a field day when you're not able to use vrs, and when you go beyond the rtk base.

if you're doing PPK anyway, it's just a different flavor of the post process. 

my $0.02

YMMV 

I don't like the IMU being on. I use it when I need it, but otherwise it's off. But, I don't have the R12i only an R10

@mightymoe 

I think you might be inclined (see what I did there?) to think otherwise if you were running the R12i.