------------------------------------------------ ----------------------------------------------------
  **World Radiocommunication Conference (WRC-07)\  ![](media/image1.png){width="1.9270833333333333in"
  Geneva, 22 October - 16 November 2007**          height="0.8125in"}

                                                   

                                                   

  **PLENARY MEETING**                              **Addendum 10 to Document 5-E**

                                                   **7 September 2007**

                                                   **Original: English**

  United States of America                         

  proposals for the work of the conference         

  Agenda item 7.2                                  
  ------------------------------------------------ ----------------------------------------------------

7.2 to recommend to the Council items for inclusion in the agenda for
the next WRC, and to give its views on the preliminary agenda for the
subsequent conference and on possible agenda items for future
conferences, taking into account Resolution **803** **(WRC‑03)**

Introduction

There is a need to allocate spectrum on a primary basis worldwide in the
band 15.4-15.7 GHz for the radiolocation service, in order to provide
adequate spectrum for new advanced radar systems to function. Emerging
requirements for increased image resolution and increased range accuracy
necessitate wider emission bandwidths than are currently available.
Therefore, there is a need to add a primary allocation to the
radiolocation service in the frequency range 15.4-15.7 GHz in order for
existing and planned radar systems to satisfy their required missions.

The band 15.4-15.7 GHz is allocated on a primary basis to the
aeronautical radionavigation service (ARNS) and portions of the band to
the fixed-satellite service (FSS) limited to feeder links for non‑GSO
MSS and in both space-Earth and Earth-space directions. There are no
ICAO-standard ARNS systems that operate in this band. Also, those ARNS
systems in this band are radars that have similar technical and
operational characteristics as radiolocation systems. While the ARNS is
recognized as a safety service as delineated in No. 4.10 of the Radio
Regulations, radiolocation services have demonstrated compatible
operations with radionavigation radars in other bands over many years
through the use of similar system characteristics such as low-duty cycle
emissions and scanning beams as well as interference reduction
techniques. Studies within ITU-R addressing compatibility between the
radiolocation and radionavigation radars in other frequency bands
provide reasonable evidence that sharing in the band 15.4-15.7 GHz
between these services may be feasible. Recommendation ITU-R M.1730
contains the technical characteristics and protection criteria for
radiolocation radars in the band 15.4-17.3 GHz and Recommendation ITU-R
M.1372 identifies interference reduction techniques which enhance
compatibility among radar systems.

Also, Report ITU-R M.2076 contains further mitigation factors for
radiolocation interference to radionavigation radars in the 9 GHz band,
many of which apply to the band 15.4-15.7 GHz as well. Further study is
ongoing within ITU-R to confirm the compatibility between the
radiolocation and aeronautical radionavigation services in these bands.

The United States proposes to submit a new agenda item for a primary
allocation to the radiolocation service in the band 15.4-15.7 GHz to be
considered at WRC-11, as shown in the attachment.

**Attachment**: 1

ATTACHMENT

Proposal for an additional agenda item considering a primary allocation\
to the radiolocation service in the band 15.4-15.7 GHz

***Subject:*** Proposed future WRC agenda item for WRC-11 to consider a
primary allocation to the radiolocation service in the band 15.4-15.7
GHz

***Origin**:* United States of America

***Proposal:*** To consider a primary allocation to the radiolocation
service in the band 15.4-15.7 GHz, taking into account the results of
ITU-R studies in accordance with Resolution **\[USA-6\] (WRC‑07)**

***Background/reason:*** Allocating a primary radiolocation service in
the band 15.4-15.7 GHz will provide additional spectrum for new advanced
radar systems with increased image resolution and increased range
accuracy that necessitate wider emission bandwidths than are currently
available. Operation of radiolocation radars in this band will not
adversely affect other co-primary services in the band or the radio
astronomy service in the adjacent band (15.35-15.40 GHz).

***Radiocommunication services concerned:*** RL, ARNS, FSS, RA

***Indication of possible difficulties:*** None foreseen

***Previous/ongoing studies on the issue:*** Recommendation ITU-R
M.1730, "Characteristics of and protection criteria for the
radiolocation service in the band 15.7-17.3 GHz", was adopted in 2005.
Sharing between RL and ARNS in the 9 GHz band was studied as part of the
work of WRC-07 Agenda item 1.3, resulting in very little sharing
difficulties, and the same is expected in this band.

***ITU-R Study Groups concerned:*** SG 8, SG 7 and SG 4

***ITU resource implications, including financial implications (refer to
CV126):*** Minimal

***Common regional proposal:*** No ***Multicountry proposal:*** No

***Number of countries:*** --

***Remarks***

**MOD** USA/5A10/1

RESOLUTION 803 (Rev.WRC-0[7]{.underline})

Agenda for the 2011 World\
Radiocommunication Conference

The World Radiocommunication Conference (Geneva,
200~~3~~[7]{.underline}),

\...

**add** USA/5A10/2

**2.Xh** to consider a primary allocation to the radiolocation service
in the band 15.4-15.7 GHz, taking into account the results of ITU-R
studies in accordance with Resolution **\[USA-6\] (WRC‑07)**;

\...

**Reasons:** Allocating a primary radiolocation service in the band
15.4-15.7 GHz will provide additional spectrum for new advanced radar
systems with increased image resolution and increased range accuracy
that necessitate wider emission bandwidths than are currently available.
Operation of radiolocation radars in this band will not adversely affect
other co-primary services in the band or the radio astronomy service in
the adjacent band 15.35-15.40 GHz.

**ADD** USA/5A10/3

RESOLUTION \[USA-6\] (WRC-07)

Use of the band 15.4-15.7 GHz by the radiolocation service

The World Radiocommunication Conference (Geneva, 2007),

considering

*a)* that the aeronautical radionavigation service (ARNS) has an
allocation on a primary basis in the frequency range 15.4-15.7 GHz;

*b)* that the fixed-satellite service has an allocation on a primary
basis in the frequency range 15.43-15.63 GHz taking into account the
constraints of No. **5.511A**, as well as the bands 15.4-15.43 and
15.63-15.7 GHz taking into account the constraints of No. **5.11D**;

*c)* that there are no ICAO-standard ARNS systems operating in this band
and that those ARNS systems that do use this band are radars that have
similar technical and operational characteristics as radiolocation
systems;

*d)* that, to provide adequate spectrum for new radar systems, there is
a need to allocate on a primary basis worldwide additional spectrum in
the band 15.4-15.7 GHz for the radiolocation service;

*e)* that emerging requirements for increased resolution and range
accuracy necessitate wider emission bandwidths;

*f)* that, while the aeronautical radionavigation service is recognized
as a safety service and is to be given special consideration as
delineated in No. **4.10**, radiolocation services using system low duty
cycle emissions, scanning beams and interference reduction have
demonstrated compatible operations with radionavigation radars in
several bands (2 900-3 100 MHz, 9 000-9 200 MHz and 9 300-9 500 MHz)
over many years;

*g)* that previous and ongoing studies in ITU-R addressing other bands
indicate that compatibility in the band 15.4-15.7 GHz between
radionavigation and radiolocation radars may be feasible;

*h)* that radars in the radiolocation service operate on a primary basis
worldwide in the band 15.7-17.3 GHz;

*i)* that Recommendation ITU-R M.1372 identifies interference reduction
techniques which enhance compatibility among radar systems;

*j)* that Report ITU-R M.2076 contains further mitigation factors for
radiolocation interference to radionavigation radars in the 9 GHz band,
many of which apply to the band 15.4-15.7 GHz;

*k)* that Recommendation ITU-R M.1730 provides information on the
technical characteristics and protection criteria for the radiolocation
service in the band 15.7-17.3 GHz,

recognizing

*a)* that it is important to ensure radiolocation radars can be operated
compatibly with the existing primary services having allocations in the
band 15.4-15.7 GHz and with the radio astronomy service (RAS) in the
adjacent band 15.35-15.40 GHz;

*b)* that a primary allocation worldwide may be required to give
developers of radar systems operating in the radiolocation service,
manufacturers and investors confidence that their systems will have the
regulatory assurance to operate globally,

resolves

to consider at WRC-11 a primary allocation to the radiolocation service
in the band 15.4-15.7 GHz, taking into account the results of ITU-R
studies,

invites ITU-R

1 to continue to study, as a matter of urgency, the technical
characteristics, protection criteria, and other factors to ensure that
radiolocation systems can operate compatibly with systems in the
aeronautical radionavigation and fixed-satellite services in the band
15.4-15.7 GHz;

2 to study, as a matter of urgency, the compatibility between the
radiolocation service in the band 15.4-15.7 GHz and RAS in the adjacent
band 15.35-15.40 GHz;

3 to include the results of the above studies in one or more new or
existing ITU-R Recommendations;

4 to complete these studies in time for WRC-11.

**Reasons:** Outline the studies required to consider a primary
allocation to the radiolocation service in the band 15.4-15.7 GHz.

\_\_\_\_\_\_\_\_\_\_\_\_