Networks and Engineering Standing Committee Forum

General Topics => Mission Tracking Feedback => Topic started by: Matt Wilkinson on April 06, 2018, 03:15:05 PM

Title: S-NET tracking
Post by: Matt Wilkinson on April 06, 2018, 03:15:05 PM
The 4 S-NET (https://ilrs.cddis.eosdis.nasa.gov/missions/satellite_missions/current_missions/snt4_general.html (https://ilrs.cddis.eosdis.nasa.gov/missions/satellite_missions/current_missions/snt4_general.html)) satellites were launched on February 01, 2018.  They have been difficult targets up to now. At Herstmonceux, we've had a number of unsuccessful attempts. And i think they have not been tracked by any station in the ILRS network.

(https://ilrs.cddis.eosdis.nasa.gov/images/S-NET.jpg)

However, next week (11th April) we expect to begin to see passes that are partially sunlit and so we will hopefully stand a better chance of getting some returns. This must also be true for other stations.

We will focus on S-NET4 as suggested in the recent ilrs-sta mail (https://lists.nasa.gov/pipermail/ilrs-sta/2018-April/005207.html (https://lists.nasa.gov/pipermail/ilrs-sta/2018-April/005207.html)).

Please use this space below to comment on your S-NET attempts, successes and failures over the coming weeks. Good luck!
Title: Re: S-NET tracking
Post by: jsteinborn on April 10, 2018, 02:59:27 PM
Dear all,

We got a glimpse of S-NET 4 tonight!

Sadly we were unable to record a relevant number of data points.

We saw the target swooshing through the screen with a time bias setting of -170 to -200 ms.
The real time bias must be less than -200 ms.

Best
Jens
Title: Re: S-NET tracking
Post by: Yarragadee on April 15, 2018, 07:39:54 AM
Dear All,

The details on the two passes we have got returns on so far:

Doy 103/1600
Sic: 6207
CPF: DLR6031
Timebias +40mS
X-track: ~0 mdeg
Returns: 96
Comments: Returns steady in range window @ 40mS. Return strength similar to
technosat and faded out during pca period.

DOY 104/1605
Sic: 6207
CPF: DLR6031
Timebias -30mS
X-track: ~0 mdeg
Returns: 167/64 ( two segments)
Comments: Returns steady.

Now I will see if I can attach the excel spreadsheet of the O-C's - Randall
Title: Re: S-NET tracking
Post by: Yarragadee on April 24, 2018, 08:42:54 AM
Dear All,

Snet4 pass doy 114/0430
cpf: DLR6131
timebias -30mS
Returns: 89

Title: Re: S-NET tracking
Post by: Matt Wilkinson on June 04, 2018, 09:34:14 AM
See the attached for a plot of kHz residuals from S-NET1 taken over the weekend at Herstmonceux SLR station
Title: Re: S-NET tracking
Post by: zizung on June 13, 2018, 05:59:53 PM
thank you!