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Questionnaire concerning of biases for undifferenced ambiguity resolution:
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Your name and institution: Sylvain LOYER (CLS) 
Contact email address(es):   igs-ac@cls.fr 

Primary reference/paper for your approach (URL address or email attached):

    We follow Flavien Mercier & Denis Laurichesse Approach : 
    Laurichesse, D., & Mercier, F. (2007). Integer ambiguity resolution on undifferenced GPS phase measurements
    and its application to PPP. ION GNSS 2007 20th International Technical Meeting of the Satellite Division, 
    25-28 September 2007, Fort Worth, TX, pp. 839-848.

    A paper concerning the CNES-CLS AC's products is under review...


List of bias types considered and their temporal resolution:

WSB (Wide Lane Satellite Biases) from Wide-Lane.
One value per day available at ftp://ftpsedr.cls.fr/pub/igsac/grgwwww7.wsb

Clock corrections are generated at intervals of: 30s internally 
   ( but only 300s clocks delivered  in clk files under Jim's recommendation ) 


Ambiguity resolution for:
[X] undifferenced observations
[ ] between-satellite observations
[ ] other:


How do you select GPS code observable types (to be used for a specific 
station)
if P1 and C1, or P2 and C2 are available?

again, idem Tim's answer

"1) C2 Never!! (at least not from RINEX 2.xx) 
 2) P1 otherwise C1, but C1 corrected to P1 using the CC2NONCC program and the P1C1 biases from CODE."

Do you generate integer phase clock corrections on a regular/operational 
basis?
[X] Yes  since GPS week 1555 
[ } No, but test results (in clock-RINEX) would be available for:


Recommendations for PPP users of your integer phase clock product:
  
Use of the WSB file TOGETHER with the "grg" clocks


Do you have corresponding bias results available (in ASCII form)?
[X] Yes  ftp://ftpsedr.cls.fr/pub/igsac/grgwwww7.wsb
[ ] No
A complete set of WSB biases since year 2000 is available on request..


Are there any specialties concerning your integer phase clock product?

They are defined at an arbitrary number of Narrow Lane cycles and this property 
allow us to construct  a continuous phase clock solution over several (or even more) days.  


Extra question: Do you have experience/plans in extending your approach to
GLONASS observations?
[ ] No
[ ] Yes, please specify:  

No Experience yet, but Yes if it is possible.  
Possibly also for Galileo....