Daytime versus nighttime GNSS accuracy?

I don't know about daytime-nighttime occupation time equivalencies, but I can say that lower TEC (total electron count) in the upper atmosphere will yield quieter result. Elevated TEC (which occurs from solar radiation hitting the ionosphere) likely will mean out with a long session, so probably results between high TEC and low TEC might not be any more accurate, but will have less noise. This was especially true for L1 only receivers, dual frequency processing is supposed to account for ionospheric delay. Definitely not a dumb question and one that could be answered with several different days of CORS data from day and night submitted to OPUS.

Hey, now you can work day and night and still get your sleep;)
I'll have to try that one out with my sons

Work? This is a stinkin' hobby! Although, granted, a weird one.....

I agree with Shawn's comments above.

I have done quite a few "over-nighters" with both RTK Base Stations and misc. Static campaigns. I consider it [essentially] FREE data, and with several receivers running during the night, you can really fill in a Network in a hurry.

Loyal

OtherHand, post: 444343, member: 12932 wrote: I seem to recall reading somewhere that... one hour of nighttime data collection will provide the accuracy of two hours of daytime collecting

That was the scuttlebutt back when I started doing GPS. It was common to only have only the bare minimum number of satellites then, so it was worth considering. Anyway, I don't see any reason why you couldn't do just as you say - let it simmer overnight.

Gentlemen, thank you very much for your input. So the back of the truck it will be. Well....once it cools done out there. Not a good time for the desert at the moment.

Tom

I've done overnight sessions in safe areas where I started them and left them overnight. It's a way to get two long sessions per 24 hour period. One after breakfast to mid afternoon then one overnight.

Back in my L-1 days, I left several out all night. Challenging area. They got me good data. One was on a 1/4 cor. I cut 3 holes to the sky. One at 2:00, one at 7:00, and another at around 9:30ish.
I got the shot. 2 hrs would not get it.
But, that overnighter got it.
This was the early days of "pushing the limits".
I eventually learned what would work, such as 2 hrs, 6 hrs, 8 hrs. I had 6 L-1 units, so this made for some long, interesting data.
I learned that for some sites, that were "impossible", that if you simply waited long enough.... You'd get it.
My early days of studying this, has made me a Javad fan today....
Carry on...

Mark Mayer, post: 444365, member: 424 wrote: That was the scuttlebutt back when I started doing GPS. It was common to only have only the bare minimum number of satellites then, so it was worth considering. Anyway, I don't see any reason why you couldn't do just as you say - let it simmer overnight.

In the early days, summer was day, winter was night. Not enough satellites to choose when. Only a 4-5 window per day.

I gather since you are talking about 5700 you are talking GPS only rather than any other constellations as well?

Does OPUS process anything else besides GPS?

If GPS only, then I would think satellite planning would make more of a difference than day or night.

Please let us know of your results. I'm interested even though I'm unlikely to get out at night to chase a few extra mm.

Yes, it's just an old 5700 collecting GPS only data. As far as I know, OPUS uses only GPS observations. And I have been more than a bit curious if good satellite geometry would trump nighttime, and lengthier, data collection.

It's not so much obtaining slightly better accuracy, although that's good, but rather logistics. Sitting around in a desert environment staring at a tripod for 4+ hours is pretty darn boring. Then there's the temperature, unless I hold off until winter. Setting up in the evening, then hitting the sack and leaving upon waking up will likely seem like I wasting less time.