UM982 in dual with a fall back to HAS

RTK Base Setup
1

Hi
I would know if I could configure the UM982 to work as dual with an RTK base station and having it HAS capable when not connected.

for PPP, E6-HAS from here
It need a specific firmware? 13495?
And the signal group 3 6?

Is the receiver still RTK capable then?

2

13495 is E6-HAS capable.
Yes, signal group 3,6.
Yes, the receiver will go from RTK to HAS.

There have been reports of pretty good jumps in position when switching from RTK Fix to HAS. This makes sense as the receiver is going from sub-CM accuray to sub-20cm accuracy. I would try both in the fields where one typically uses their tractor to see if RTK Fix degrading to RTK Float is more graceful than RTK Fix degrading to E6-HAS.

1 Like
3

Great
I don’t plan to use it as “in field” fall back. It’s more to use it not connected to a base while far away from the base.
Or if internet/base is not available.

4

Big jump can also be from improperly survey in base station. So jump from RTK to single or HAS has big error. But error is unavoidable, HAS has absolute accuracy at ±20cm but relative is far better.

But dual roll would be very bad with HAS.

5

Have you tested it? I would be neat if it takes the relative position from each antenna, like moving base, so it would be able to calculate roll even without correction.

6

Hello, has anyone already shared a properly working um982 with a micro board?

7

Ok here is my configuration (to be tested)
I use “Coolterm” as terminal
First configure Coolterm:
In the “Option”, in “Terminal” I change “terminal mode” to “Line Mode”

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image537Ă—602 15.8 KB

In “Transmit” I check “Use transmit line delay” and set to 30 ms
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image536Ă—600 17.8 KB

In “Connection” press “send string” to open the send window

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image454Ă—387 14.1 KB

Now follow this:

config dual UM982 with Has capability
//to see version firmware
//type:
VERSION

must be firmware 13495

//type:
FRESET
/// this reset all settings, set bautrates to 115200 and disable all outputs (I think)

////reconnect if necesary with 115200

//type:
CONFIG RTK RELIABILITY 3 1
CONFIG SMOOTH RTKHEIGHT 0
CONFIG HEADING RELIABILITY 3
CONFIG HEADING VARIABLELENGTH
CONFIG SMOOTH HEADING 0
CONFIG HEADING OFFSET 90
CONFIG RTK TIMEOUT 120
CONFIG COM1 460800
MODE ROVER SURVEY
GPGGA COM3 1 
GPVTG COM3 1 
GPHPR COM3 1
KSXT COM1 0.1
SAVECONFIG

////then type:
CONFIG SIGNALGROUP 3 6

////then type:
CONFIG PPP ENABLE E6-HAS
SAVECONFIG


////type "CONFIG" to see if all is OK


////should look like this:
$command,config,response: OK*54
$CONFIG,ANTENNA,CONFIG ANTENNA POWERON*7A
$CONFIG,NMEAVERSION,CONFIG NMEAVERSION V410*47
$CONFIG,RTK,CONFIG RTK TIMEOUT 120*69
$CONFIG,RTK,CONFIG RTK RELIABILITY 3 1*76
$CONFIG,SMOOTH,CONFIG SMOOTH RTKHEIGHT 0*66
$CONFIG,PPP,CONFIG PPP TIMEOUT 120*6C
$CONFIG,PPP,CONFIG PPP ENABLE E6-HAS*01
$CONFIG,HEADING,CONFIG HEADING OFFSET 90.0 0.0*10
$CONFIG,HEADING,CONFIG HEADING RELIABILITY 3*67
$CONFIG,HEADING,CONFIG HEADING VARIABLELENGTH*3E
$CONFIG,SMOOTH,CONFIG SMOOTH HEADING 0*7C
$CONFIG,DGPS,CONFIG DGPS TIMEOUT 600*69
$CONFIG,RTCMB1CB2A,CONFIG RTCMB1CB2A ENABLE*25
$CONFIG,ANTENNADELTAHEN,CONFIG ANTENNADELTAHEN 0.0000 0.0000 0.0000*3A
$CONFIG,PPS,CONFIG PPS ENABLE GPS POSITIVE 500000 1000 0 0*6E
$CONFIG,SIGNALGROUP,CONFIG SIGNALGROUP 3 6*01
$CONFIG,ANTIJAM,CONFIG ANTIJAM AUTO*2B
$CONFIG,AGNSS,CONFIG AGNSS DISABLE*70
$CONFIG,BASEOBSFILTER,CONFIG BASEOBSFILTER DISABLE*70
$CONFIG,LOGSEQ,CONFIG LOGSEQ 1*15
$CONFIG,COM1,CONFIG COM1 460800*2E
$CONFIG,COM2,CONFIG COM2 115200*23
$CONFIG,COM3,CONFIG COM3 115200*23

Here is a video on Youtube

2 Likes
8

Is there any way to configure the UM982 to work on PPP,HAS without falling back from rtk fix?
I’ve used the above commands and works fine when rtk fix is lost but would like to be able to use PPP only, when there’s no phone signal or base nearby.

9

Any update to this?
Would also be interested in using the um982 to use ppp instead of rtk due to poor phone signal area’s

10

What I can say is that the RTK fix seems not as solid as with the standard signal group. It comes to float from time to time. But it’s with an F9P as base, not yet installed my UM980 base.

For the precision in HAS mode, it seems that the error can be a little greater than 10 cm.

I have heard that it would be worse in some parts of the world.
I’m in North America, I don’t know if it would be better in Europa.

11

Has anyone had any luck using the iowa dot ntrip server? I can get the um980 to work with fix2fix but i cant get the dot ntrip corrections to work…

12

A fellow Iowan :grinning_face: I use it with no problems. F9P and NTRIP part of AIO. If it’s specific to the um980 I probably can’t help.

13

Its worked great with the f9p

14

I think i figured it out. If i connect the reciever via serial it works great. It must be how im forwarding the message to the serial port on my module.