What equipment is acceptable for use in the IGS?
See the IGS Site Guidelines.
Does the IGS endorse equipment?
No, the IGS maintains vendor neutrality and instead publishes functional requirements.
Does the IGS certify equipment as meeting the guidelines?
We do not issue certifications, but we can ask an IGS analyst to examine sample data sets from new equipment types and comment.
But somebody issued a call for proposals (or tender) with a requirement for equipment to be IGS-certified!
You could, for example, refer them to this faq to demonstrate that the IGS does not endorse or cerfity equipment, or assert whether the equipment meets IGS functional guidelines.
What kind of support from equipment manufacturers do IGS users expect?
The data is archived permanently and used in long-term studies. There are therefore questions that arise about models which are no longer current, and it is helpful to have familiarity with historical products.
It is also necessary for the IGS to establish what observables are directly tracked by each receiver type. We can determine this from data, but appreciate information from the manufacturer as well. Please see IGSMail #2320 (24 Jun 1999) in the archives at http://igscb.jpl.nasa.gov
Does inclusion in the rcvr_ant.tab naming table mean the equipment may be used in the IGS?
Not necessarily. The IGS Site Guidelines establish functional requirements for equipment in the IGS network. The Central Bureau can arrange for an analysis center to examine sample data from new equipment types and comment on its suitability for the IGS.
What should equipment manufacturers keep in mind in product planning stages?
Please read over the IGS Site Guidelines and take note of things like the necessary antenna calibration, and requested settings such as recording data from satellites marked unhealthy.
What do equipment manufacturers need to know about antenna and radome calibration?
Please see the IGS Site Guidelines.
How should equipment manufacturers communicate with the IGS?
The Network Coordinator at the Central Bureau, igscb @ igscb.jpl.nasa.gov can be your point of contact any time you are not sure where to turn.
Will you please add my company's new antenna model to the absolute IGS anteanna correction file (igs05.atx)
At the moment, the file igs05.atx contains all corrections available either from Geo++ or from NGS. The only prerequisite is the presence of an official IGS anteanna name within rcvr_ant.tab. You may seek additional info from the IGS Antenna Working Group. References:
And what of radome calibration?
Please see IGSMail #4463.
Also, it is not allowed to enter a new antenna and radome combination into the IGS if absolute calibration results are not available. In addition, in cases of missing radome calibration, the phase center corrections for the corresponding antenna without the radome are used. Another important point could be the problem(s) of adding calibrations for combinations that are already in use. For reasons of consistency, this is not always possible.
Why does the official IGS igs_01.pcv table differ from the NGS and Geo++ calibration tables? Which one should I use?
igs_01.pcv is the official table to be used in IGS analysis. And yes, it does differ from NGS' latest table, and even if you look closely, also from NGS' previous table. The history is that some years back, NGS and other groups doing calibrations collaborated to make a definitive IGS table by averaging the various measurements available. Some time later the NGS table you see now came out. We have not updated the IGS values to NGS' latest in all cases for a few reasons:
- we want to limit changes in IGS analysis to avoid jumps
- need new effort to determine "best" values to use (it is thought now that averaging might mask some information)
We currently have an ad-hoc committee which is working to obtain quality satellite pcv tables, which would enable use of absolute rather than relative calibrations in a future update of the igs_01.pcv file.
At present, when we get an antenna not yet in igs_01.pcv, we inquire with a few regional networks such as EUREF whether they have any calibrations for it, and if not, we add the current NGS value.
In short, if you are doing IGS analysis you should be using igs_01.pcv. If not you should just be certain whatever you choose is consistent with your requirements.