Rover Status Fix but signal bars fluctuating and not correct coordinates

[Alok_P (AayP)]

Hi

My both reach device - Base and Rover working fine.

Even I got Status - Fix

But the problems are:

1. My signals bar keeps on fluctuating
2. My rover coordinates are almost 5-10m accuracy even after “Fix” Status

This is my Base Settings.

This is my Rover Settings:

This is Status Page:

[igor.vereninov]

Hi,

You set parameter “integer ambiguity validation threshold” to “1”, which means that almost any solution would be considered a fixed one. This is why you are seeing bad precision. Your sat signals do not look good. Are you testing outside or indoors?

[Alok_P (AayP)]

Both devices are outside.

How much “integer ambiguity validation threshold” should be?

[igor.vereninov]

By default it is “3”. If you changed any advanced settings you might consider resetting to defaults.

Please provide a picture of your setup. Did you mount it in open area with groundplane under antenna?

[Alok_P (AayP)]

Yes I put everything on default.

1. GLONASS integer ambiguity resolution mode - ON
2. Integer ambiguity validation threshold - 3
3. Minimum lock count to fix integer ambiguity - 0

I have mounted on the roof top of my car.

Now the signals still fluctuating and status is “Float” and not “Fix”

[igor.vereninov]

You also need to set configs to 5Hz GPS/Glonass to use Glonass and enable dynamic filter to improve performance. Switching from float to fix take a few minutes in good conditions. I can see buildings around, please make sure that sky view is not obstructed.

[Alok_P (AayP)]

Is this settings okay?

Base

Rover:

And yes there is nothing on the top, its an open parking area. The silver dot is where my car is parked.

[igor.vereninov]

You need to add Glonass to “used positioning systems” as well.

[igor.vereninov]

I can see that you are from Japan. You can try using Beidou+GPS instead of Glonass+GPS.

[Alok_P (AayP)]

What will be the “Used Positioning Systems” if I used Beidou+GPS? And shall I used at 5Hz frequency?

[igor.vereninov]

Use positioning systems “GPS, Beidou” Config file GPS+Beidou 5Hz.

[Alok_P (AayP)]

But there is no “BDS” in Used Positioning Systems.

Only these are available:

[igor.vereninov]

It is “comp” here. Compass and Beidou are synonyms. Please also enable sbas and QZS here.

[Alok_P (AayP)]

Ok I did this Settings:

Its coming “Float” Status now.

I will wait for 5-10 mins if its getting “Fix” Status or not and then I will update here.

This is the output currently.

[Alok_P (AayP)]

Hi @igor.vereninov

Almost half an hour and still “Float” Status.

[igor.vereninov]

You can see that there are no grey bars for Beidou and QZSS. Your base should be configured for Beidou as well + enable all RTCM messages.

[Alok_P (AayP)]

Hello @igor.vereninov

I enabled all RTCM messages in Base Settings.

I am attaching my Base and Rover Settings and also signal status which is currently “Float”

Base Settings:

Rover Settings:

Signals Status

[bide]

your settings seem to match what @igor.vereninov recommended and the rest look good to me. some possible problems:

• GPS satellites: not enough with SNR > 45dB (currently 4; where 5 or 6 is best)
• the satellite geometry may not be ideal at the moment, and some time later it may be better for a fix
• base and rover too close together? try increasing the distance between them to 10 or 20m or at least not on the same car roof
• multipath reflections from the nearby building confusing Reach. Maybe move your setup away from the side and over toward the corner of the building where there are far less reflections
• check your base coordinates are as accurate as possible

[Alok_P (AayP)]

@igor.vereninov

I really have no idea whats going on.

Its always float and never gets fix. I tried all the methods given by you guys but still no success.

[bide]

Maybe you could upload a set of log files and I or someone else could post-process it and see if we can get a fix out of it.