PPK Drone and Base: Only Q2 fix

ReachView 2.5.3

Rover_Reach on the RPA
Base_Reach on a tripod

Base_Reach _ ReachView-RTK-Settings.pdf (58.1 KB)
Rover_Reach _ ReachView-RTK-Settings.pdf (58.2 KB)

I followed this guide https://docs.emlid.com/reach/common/tutorials/gps-post-processing/
Not entered the SNR Mask at all because I don’t know how

The result in RTK Plot is only a Q2 fix.

Now I would like to know if there is a chance is due to wrong inputs in RTKPOST and I only need to study and tweak it more at the office or I have to do the survey again changing something else.

I have tried with the rinex from a Trimble geodesic instead of the Reach Base too but same result.

Thank you

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Looks like the base is not injecting corrections.

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It is post processing, only to geotag photos later

The screenshots are made after takeoff, and this one was made before

@lanzo I am doing the same thing mate using a Topcon GR3 in static mode as a base and a Reach unit on a multirotor UAV to get PPK photocentres for geotagging. I had a look at your rover settings did you try just GPS @ 14HZ ? That is what I was told by @Luke_Wijnberg he has been doing the same thing with a fixed wing UAV.

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Can you please post the raw data logs? I am sure that we can find the reason there.

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you can use SNR mask like this, just type 1 against the value you want to use(someone please correct me if i’m wrong), 35 or 40 will be good.

You can refer the following topic for setting in rtkpost :


maybe this helps :slight_smile:

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RAW Data logs:
https://drive.google.com/file/d/0B5D4NWIsFtYmTHB0MXIwNjNGYlk/view?usp=sharing

I have logs from a Trimble R4 and from a National Station too, I took some GCP too to compare the results, but first I need to know if I have the fix otherwise I have to do the survey again.
Thank you

First run looks somewhat ok, might get better then this.

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Though your rover end is getting much interferenc on the low angel. 45-50 degrees and below. And some noice a bit higher

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Fix&Hold looks much better

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wow, how the magic works?

Tim sent me these points:

ImgName latitude(deg) longitude(deg) height(m)
IMG_0034.JPG -3.0254036200 -47.3133949450 252.10520
IMG_0035.JPG -3.0255894350 -47.3133442930 251.37260
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IMG_0039.JPG -3.0263209990 -47.3130549570 242.12650
IMG_0040.JPG -3.0265362300 -47.3129636460 241.95000
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IMG_0215.JPG -3.0253529160 -47.3073215160 243.24350
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IMG_0220.JPG -3.0241561760 -47.3077365180 246.35840
IMG_0221.JPG -3.0239250170 -47.3078275730 246.80250
IMG_0222.JPG -3.0236899400 -47.3079099990 247.26160
IMG_0223.JPG -3.0234592960 -47.3079965400 248.99770
IMG_0224.JPG -3.0232226690 -47.3080790080 249.31050
IMG_0225.JPG -3.0229841450 -47.3081604690 249.75910
(latest 2 shots are garbage 226 - 227)
The drone has rudder so it only use roll at the end of the line
Thank you

Dear TB_RTK Can you share the config you used in RTKPOST to obtain that result? I am playing with setting of the old Tuffwing tutorial and the new tutorial from emlid with bad results, thank you

Here you go
Lanzo.zip (442.2 KB)

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Thank you very much TB (what’s your name?)
Today I made a new survey, 700 ha, same settings and hardware, I’m going to try your config.
Look at the picture, 40 years ago it was all Amazon Rainforest…

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What do you think TB_RTK?
The flight started at the left with Q1 fix until that orange parts where I set in loiter for a while waiting for clouds to go away, maybe the banking lost the fix but in the final part, the last 3 orange lines had to be green.
Thank you
p.s. it is more than 1:40 of flight

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I noticed you have uhf/vhf antenna on your tale (plane). I would raise gps antenna above this point to eliminated any unwanted interference. And yes, banking the plane may cause reach to loose fix,due to the angel and loosing line of sight to satellites. Other then that it looks like a good run, but practice makes master right :slight_smile:

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It remembers me a thread on diydrones :

But his dipole is far from reach antenna. Do you think it really interfer ?

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Im not sure how much it effects the gps but would definitely investigate it further.

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The little dipole near the GPS is the telemetry radio 900Mhz 500mW(maybe false). I can put it back on the tail.
The big dipole on the rudder is only receiving 433 from the Radio link (Dragonlink)

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Dear TB_RTK If I use a reference station (like US CORSS) instead of the Base Reach I must get a better result, the RINEX version is 2.11 and the file is .17o, do I have to convert the Rover RAW to same RINEX version?
Thank you

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