[unav_all] GNSS Session (G12) at the 2009 Fall AGU: Call for Abstracts

[Yoaz Bar-Sever]

We are inviting contributions from the GNSS research community to 
Session G12 of the 2009 Fall AGU meeting in San Francisco. The 
Session Description follows.

The deadline for Abstracts is September 3. To submit an Abstract 
please go to http://agu-fm09.abstractcentral.com/index.jsp

Kind regards,

Session G12 Conveners:
Yoaz Bar-Sever, JPL (Yoaz.Bar-Sever at jpl.nasa.gov)
Tim Springer, ESA (Tim.Springer at esa.int)


G12: Challenges and Opportunities in Combining Multiple GNSS Observations 

The availability of modernized GPS, a revitalized GLONASS, and the 
upcoming Compass and Galileo will offer many challenges but also 
exciting opportunities in the next decade. Mixing different GNSS 
today brings about significant complications like intersystem biases 
and because of different modulations, e.g. CDMA for GPS versus FDMA 
for GLONASS, also frequency dependent biases. The addition of new 
signals on existing frequencies as well as additional frequencies 
will further complicate matters. Today we are already suffering 
issues with this with GPS alone. The new available civil code 
measurements on the L2 frequency has lead to an inhomogeneous set of 
observations from different receivers. Some receivers now deliver 
only C1 and C2 whereas others provide only P1 and P2. The combination 
of observations of such receivers is problematic because of the 
biases present in each of these observations. Thinking about the 
future with Galileo offering 5 different measurement types on E1, 9 
different measurement types on E5, and 5 different measurement types 
on E6 (see RINEX 3.00) the myriad of different observation 
combinations and biases becomes mind-boggling! And things get even 
more complicated if we think about GLONASS moving from FDMA to CDMA 
and the new Compass system. Despite all these challenges we are 
convinced that the new and improved signals, as well as the new and 
additional satellites in different orbit configurations do present 
some very exciting opportunities. This is especially true considering 
that the planned GNSS systems promise to increase the number of 
satellites by a factor of 4 and to improve the accuracy of the (code) 
measurements by a factor of 10 (from 1 to 0.1 meters). With this 
session we would like to invite presentations addressing not only the 
challenges but also presentations highlighting the opportunities 
offered by the new signals and systems. We therefore would appreciate 
contributions which focus on ensuring that we will in fact be able to 
combine the observations from all different systems observed by many 
different receivers. Here contributions from the hard- and soft-ware 
receiver side are especially welcome. Furthermore we solicit 
contributions focusing on the scientific opportunities offered by 
true GNSS solutions, e.g. GPS + GLONASS, COMPASS, and/or Galileo, 
both today as well as in the (near) future. 
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