Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.ipa.nw.ru/conference/wpltn2012/resolution/resolution%20wpltn_eng.doc Дата изменения: Thu Dec 20 15:07:22 2012 Дата индексирования: Sun Feb 3 10:26:16 2013 Кодировка: Поисковые слова: hydrogen

RESOLUTION

of the International Scientific Technical Conference WPLTN-2012

1. Considering:

* the necessity and importance of increasing the precision of satellite
navigation systems worldwide and their integration, which includes matching
coordinate systems and time scales to each other;

* the fact that combining methods of one-way and two-way laser ranging
allows the precision of GNSS geodetic and ephemeris time support to be
increased substantially,

the participants of the International Scientific Technical Conference WPLTN-
2012 have come to the common opinion on the following:

1. We think laser methods of time transmission to be potentially most
accurate both for the purpose of solving a problem of matching time
scales with each other in different navigation systems and in order to
achieve the goal of transmitting time scales to remote points.

2. We approve the principle of equipping all navigation space crafts both
with laser retroreflector systems and receiving devices which register
the time a laser pulse is received using the onboard time scale.

3. We recommend deploying laser stations, which are modernized to operate
in one-way and two-way laser ranging mode, nearby the national GNSS
synchronizers and other holders of central time scale standards.

4. We recommend WPLTN member-countries to give high priority status to
observations of GNSS navigation spacecrafts which are equipped with
retroreflector systems.

5. We take note that nano-gradient optical coatings have a good future in
laser-ranging systems.



2. Having an opinion that the collocation of various space geodesy
measurement technologies has a fundamental role in increasing the accuracy
of fundamental and applied positioning, navigation and timing provision,
the International Scientific Technical Conference WPLTN-2012 has come to
the following conclusions:



2.1. We find it necessary to expand the laser ranging system network
(SLR), as well as other measurement technologies of space geodesy (VLBI,
LLR GNSS and DORIS) on national and international sites, giving priority
status to those of them which follow the principle of equal geographical
distribution and collocation of measurement equipment and which support
the proposition to consider installing Russian SLR and GNSS stations on
the sites which are situated on WPLTN member-countries' territories.

2.2. We approve the concept of creating geodetic spacecrafts equipped
with the means of various space geodesy measurement technologies, in
particular, the concept of creating a precisely calibrated, multi-
functional (for the VLBI, SLR, GNSS and DORIS technologies) specialized
spacecraft GRASP, which will provide collocation measurements, and we
call on all WPLTN members to take all possible opportunities to
participate in its creation (for example, Russia can contribute the
"Blits" technology).

2.3 We acknowledge that the necessary condition for space geodesy
development is the creation of new and the modernization of existing
laser stations, as well as the methods of their calibration,
metrological support and geodetic binding, which would ensure less than
one millimeter error for both occasional and systematic cases of
measurement.



3. Considering space debris pollution to be a huge threat to space
activities, and acknowledging that this problem requires international
cooperation; and noting simultaneously that monitoring methods and active
influence on space debris objects are among the perspective trends for
activities in this area, the participants of the WPLTN-2012 Conference
recommend the following:

3.1. WPLTN should organize a space debris optical tracking trial
campaign using 1 or 2 tracking stations from each member country.
Laser tracking is not to be applied to active spacecraft. The main
purpose of this campaign is to limit the growth of space debris by
reducing the number of collisions between space debris objects and
spacecraft by means of generating relevant information allowing such
collisions to be avoided.

3.2. A WPLTN Space collision center [SCC] is to be created in order
to explore collision cases and coordinate the Trial campaign.

3.3. The Trial campaign coordinator Ben Greene (Australia) to send a
program and method of observations to all WPLTN members for approval as
soon as possible.

3.4. Laser methods of space debris monitoring are to be applied
wherever it is possible in order to increase the precision of flow
forecasting.

3.5. It should be considered that laser based system to manage space
debris movement is a technologically possible project, though
expensive, would require international cooperation in order to create
systems of joint application.

4. Taking into consideration

* the fact that the Global Geodetic Observing System GGOS is based on all
main measurement technologies of space geodesy (VLBI, SLR, LLR, GNSS and
DORIS) and therefore recognized as an important contribution of space
geodesy to the global task of researching the Earth as a system;

* the fact that the main trend of GGOS improvement is the worldwide network
development of those stations which collocate various space geodesy
measurement technologies,

the participants of the International Scientific and Technical Conference
WPLTN-2012 should include an item in their agendas to actively use all
their facilities to support the IGGOS project.

5. WPLTN recognizes the special importance of the SALRO station in
The Kingdom of Saudi Arabia, and encourages all its members to provide
whatever support is possible for SLR and GNSS operations on this site.