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Subject: call for participation
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Response to CALL FOR PARTICIPATION in an

  IGS/BIPM PILOT PROJECT TO STUDY ACCURATE TIME AND FREQUENCY
       COMPARISONS USING GPS PHASE AND CODE MEASUREMENTS


Agency or group:

Contact person(s):  Alexander Crawford

E-mail address(es):  acrawfor@umich.edu

Areas of participation:
   1) Deployment of GPS receivers:           No
   2) GPS data analysis:                    Yes
   3) Analysis of instrumental delays:      Yes
   4) Time transfer comparisons:             No
   6) other:                                Analysis of Mathematical
procedures for corrections

Limitations on participation: (please list any restrictions)

Comments or suggestions:
Mr. Ray,
   I am not a professional physicist, scientist, mathematician etc.   My
training is in a completely different field which I have left because of
ethical considerations.
   I am currently working on IC design (specifically a better 555
timer), an examination of error in experimental physics due to poor
mathematical and theoretical practices, and a method/model for the
examination of complex systems.
   I have examined the problems you have described in this web site, as
well as your correction methods.  I was particularly struck by the
mention of the "error due to second order Doppler effect calculations".
I believe I have developed some schemes that might be of use to you,
principally a mathematical method which I have been working on to
"tighten" second order differentiation via the use of the Riemann sums
with an unusual consideration of the hi/low perameters ([a,b]) used with
the integrand.
   E-mail, or call me if you are interested.  I would be glad to be of
help (if possible).  I am certainly willing to send you more information
on the equations and myself.  I realize that my willingness might seem
unusual.  My phone number is (734)663-9302.  I hope to hear from you.

Sincerely,

Alexander Crawford