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Preliminary View  Y$4 WRC99 Agenda Item 1.15.2: to consider the addition of the spacetospace direction to the radionavigationsatellite service allocations in the bands 1215-1260 MHz and  W%41559-1610 MHz;"%C*&&%"Ԍ Y4ԙISSUE: Recognition in the allocation table of spacebased RNSS receivers in the bands 15591610 MHz and 12151260 MHz  Y4BACKGROUND: GPS receivers operating with both L1 and L2 signals are used for accurately positioning commercial and scientific spacecraft. However, the present allocation for RNSS does not afford protection for these signals. The U.S. is performing analysis to show that the GPS spaceborne receivers can operate in the current electromagnetic environment. Results of these studies show that interfering satellites would have to be located very close to the spaceborne GPS receiver for there to be a problem. Spurious emissions from MSS systems were also considered. However, the interference from an inband MSS  Y4downlink such has been proposed in the 15591567 MHz band has not been analyzed.  YP 4PRELIMINARY VIEW: It is appropriate to seek spacetospace as a directional indicator in the RNSS service in the 15591610 and 12151260 MHz bands. The U.S. will work in WP8D, SG7 and the Space Frequency Coordination Group to study compatibility with currently allocated services in these bands. The U.S. will also work in WP8D to demonstrate that use of GPS receivers onboard spacecraft will not impose additional constraints on services operating in adjacent bands.  Xx' E. Preliminary View  Y04 WRC99 Agenda Item 1.16: to consider allocation of frequency bands above 71GHz to the earth explorationsatellite (passive) and radio astronomy services, taking into account  W4Resolution 723 (WRC97) (COM5-1);  Y4ISSUE: Passive Allocations above 71 GHz  YZ4BACKGROUND: The passive services, (e.g. for remote sensing, radio astronomy, and meteorological observations) have substantial interests in the above 71 GHz frequency range as well, up to the 275 GHz limit of the allocation table and beyond. The active services are interested in using this spectrum, e.g. for applications involving high data rate transmission and because propagation characteristics allow extensive frequency reuse. Few active systems, particularly satellites have been implemented to date above 71 GHz. NASAs Mission to Planet Earth is dedicated to understanding the total Earth system and the effects of natural and humaninduced changes in the global environment. Passive remote sensing is key to the study of the Earth system. Other U.S. government agencies also utilize passive sensors to study and predict the weather and for other key scientific purposes. Various missions already employ passive sensing instruments at frequencies above 71 GHz and many more are planned. During the next two decades the U.S intends to upgrade and continue operating several millimeter wave telescopes that currently work above 71 GHz. Congress also provided funds for construction of the MilliMeter Array (MMA), which is expected to become operational by approximately 2005. Several other millimeter wave telescopes may be built in this time frame, and their access to the spectrum must be ensured."%C*&&%"Ԍ Y4ԙPRELIMINARY VIEW: WRC99 offers an opportunity to provide additional allocations to satisfy passive service needs, to protect existing allocations for future use, and to reorganize the allocations above 71 GHz as needed so that spectrum can be successfully shared between passive and active services in that range. The interests of other services allocated in this portion of the spectrum must also be safeguarded and satisfied as well. The United States is considering options for band reallocations that are similar to what was done at 50.271 GHz at WRC97. The band reallocation will meet the needs of all the radio services involved.  X'  X'F. Preliminary View  Yt 4 WRC99 Agenda Item 1.17: to consider possible worldwide allocation for the earth explorationsatellite (passive) and space research (passive) services in the band  W. 418.6-18.8GHz, taking into account the results of the ITUR studies;  Y 4ISSUE: Earth explorationsatellite (passive) service allocation in the band 18.6 18.8 GHz  Y4BACKGROUND: Passive spaceborne sensors provide environmental data on soil moisture, water salinity, ocean temperature, rain, snow, ice, sea state, and oil spills. A set of frequency bands is essential for these measurements because simultaneous measurements at several frequencies are needed to isolate any single effect since the energy emitted at any one frequency is determined by several overlapping effects. The band between 18.6 and 18.8 GHz is one component in this set, without which these environmental data could not be obtained. At present, the allocation for the Earth explorationsatellite (passive) service is on a primary basis in Region 2, but on a secondary basis in Regions 1 and 3. At WRC97, a joint CITEL proposal was presented to upgrade the allocations to the Earth explorationsatellite (passive) and space research (passive) services to primary. This proposal also included a pfd limit of 101 dBW/m2 in a reference bandwidth of 200 MHz on the fixedsatellite service. A limit of 3 dBW on the power in the band that is delivered to an antenna of a fixed service station with a 10 dBi backlobe gain was also included in the proposal. At the conference, agreement could not be reached on the appropriate limits on the fixed and fixedsatellite services to enable passive sensors to perform their mission (and the operation of fixed and fixedsatellite service systems). Studies are currently being conducted to determine if the limits given in the proposal at WRC97 can be modified to allow the fixed and fixedsatellite services to use more power. These studies will be completed and limits will be identified in the fall.  Y!4PRELIMINARY VIEW: The allocation for the Earth explorationsatellite (passive) service in Regions 1 and 3 must be elevated to worldwide primary status if the longterm ability to obtain environmental data with passive spaceborne sensors is to be preserved. Compatibility between the passive sensors and the active radio services requires adoption of constraints on the parameters of the fixed and fixedsatellite service systems that use the band. Studies are currently being conducted to further assess the sharing situation and determine suitable limits."%C*&&%" The U.S. supports an upgrade to EES (passive) in Regions 1 and 3 to worldwide primary in the band 18.6 18.8 GHz with appropriate worldwide constraints on all allocated services to ensure the long term sharing and use of the band.  X'  Xp' G. Preliminary View  YL4 WRC99 Agenda Item 1.18: consider the use of new digital technology for the maritime  W*4mobile service in the band 156-174 MHz and consequential revision of Appendix S18/18 ,  W4taking into account Resolution 342 (WRC97) (COM4-3);  Y4ISSUE: Appendix S18  Yz 4BACKGROUND: Appendix S18 of the ITU Radio Regulations defines the channels of the maritime mobile service. These channels support a variety of functions including Distress, Safety and Calling: public correspondence, intership, ship/shore/ship, port operations and ship movement. The maritime mobile frequency band, 156174 MHz, (effectively 156162 MHz in the U.S. due to previous domestic regulatory actions), supports maritime communications worldwide. With the rapidly increasing use of the VHF maritime mobile band, particularly for data communications, increased congestion and mutual interference is being experienced which, among others, has resulted in unacceptable degradation of the distress and safety related function for which this band is utilized. Unless action is taken this situation will only worsen as usage continue to grow. At WRC97, the United States/CITEL proposed simplex use of duplex channels for Appendix S18. This was approved for a few specific public correspondence channels only, channels 18  Y_4and 8286. Note M to Appendix S18 must be modified to add more channels for simplex  Y<4use. This will allow for more efficient use of Appendix S18 channels and provide flexibility for administrations to meet their immediate requirements, while maintaining compatibility with the vast number of ships and pleasure craft now using the band in accordance with  Y4Appendix S18 .  Y4PRELIMINARY VIEW: Modify Specific Note M to Appendix S18 to include additional  Yf4channels for simplex use of duplex channels.  YB4  ` hp x (#'` hp x (##o\  PCXP##XR PE3Q{XP# $A For additional information, please contact Damon C. Ladson or Chuck Magnuson at 4182150. L_______________\