United States of America

DRAFT PROPOSALS FOR THE WORK OF THE CONFERENCE

**Agenda Item 1.3:** in accordance with Resolution **747 (WRC-03)**,
consider upgrading the radiolocation service to primary allocation
status in the bands 9 000 - 9 200 MHz and 9 300 - 9 500 MHz, and
extending by up to 200 MHz the existing primary allocations to the Earth
exploration-satellite service (active) and the space research service
(active) in the band 9 500 - 9 800 without placing undue constraint on
the services to which the bands are allocated.

Background Information: The proposal addresses the upgrade of
radiolocation service in the band 9 000-9 200 MHz and 9 300-9 500 MHz.
As identified in Resolution 747 (WRC-03), there is a need to provide
contiguous primary spectrum around the 9 GHz band in order for existing
and planned radiolocation systems to satisfy their required missions.
Changes in technology and emerging requirements for increased image
resolution and increased range accuracy necessitate wider contiguous
emission bandwidths. Therefore, there is a need to upgrade the status of
frequency allocations to the radiolocation service in the frequency
range 9 000 - 9 200 MHz and 9 300 - 9 500 MHz.

The bands 9 000 - 9 200 MHz and 9 300 - 9 500 MHz are allocated on a
primary basis to aeronautical radionavigation and radionavigation,
respectively. The Radio Regulation No. **4.10** recognizes
radionavigation as a safety service. The radiolocation services and the
radionavigation service have demonstrated compatible operations over
many years through the use of similar system characteristics such as
low-duty cycle emissions, scanning beams and interference reduction
techniques. For example, past operational experience in the 2 900-3 100
MHz band as found in Report ITU-R M.2032 "Tests illustrating the
compatibility between maritime radionavigation radars and emissions from
radiolocation radars in the band 2 900 - 3 100 MHz" confirms that it is
possible to mitigate interference from radiolocation radars to maritime
radionavigation radars in the band.

Some studies have been completed within ITU-R WP 8B that characterize
the technical performance and protection criteria of radiolocation and
radionavigation systems that ensure compatible operations in the bands
9 000 - 9 200 MHz and 9 300 - 9 500 MHz. Recommendation ITU-R M.1313
contains the technical characteristics and protection criteria for
maritime radars in the band 9 300 - 9 500 MHz and that Recommendation
ITU-R M.1372 identifies interference reduction techniques which enhance
compatibility among radar systems.

The ITU-R studies that have been completed so far, such as on maritime
radionavigation radars and emissions from radiolocation radars in the
band 9 200 -- 9 500 MHz illustrate compatibility between the two
services in this band and are an indicator of how the sharing would be
with other radionavigation systems. These studies indicate that typical
maritime radionavigation radars can suppress emissions from other
radars, even when the maritime radars receive interference with very
high interference-to-noise (I/N) ratios if the unwanted pulsed waveform
is asynchronous and has a low effective duty cycle. These study results
support the successful historical sharing experience between the two
services in the 9 200-9 500 MHz band. As most maritime radars in the
9 000 - 9 500 MHz bands are very similar in design and operation, one
does not expect a great variation from the protection criteria that was
derived from the radars that were used for these studies. Therefore,
there is an indication that the results could apply to other similar
radars that operate in the 9 000 - 9 500 MHz bands as well. Therefore a
primary allocation for radiolocation can be added to the 9 000 - 9 200
and 9 300 - 9 500 MHz bands.

## Proposal

## USA/ /01 MOD

8 500-10 000 MHz

+----------------------+----------------------+-----------------------+
| Allocation to        |                      |                       |
| services             |                      |                       |
+----------------------+----------------------+-----------------------+
| Region 1             | Region 2             | Region 3              |
+----------------------+----------------------+-----------------------+
| ....                 |                      |                       |
+----------------------+----------------------+-----------------------+
| **9 000-9 200**      |                      |                       |
| AERONAUTICAL         |                      |                       |
| RADIONAVIGATION      |                      |                       |
| 5.337                |                      |                       |
|                      |                      |                       |
| [RADIOL              |                      |                       |
| OCATION]{.underline} |                      |                       |
|                      |                      |                       |
| ~~Radiolocation~~    |                      |                       |
| 5.471 **ADD**        |                      |                       |
| 5.472\[A\]           |                      |                       |
+----------------------+----------------------+-----------------------+
| **9 200-9 300**      |                      |                       |
| RADIOLOCATION        |                      |                       |
|                      |                      |                       |
| MARITIME             |                      |                       |
| RADIONAVIGATION      |                      |                       |
| 5.472                |                      |                       |
|                      |                      |                       |
| 5.473 5.474          |                      |                       |
+----------------------+----------------------+-----------------------+
| **9 300-9 500**      |                      |                       |
| RADIONAVIGATION      |                      |                       |
| 5.476                |                      |                       |
|                      |                      |                       |
| [RADIOL              |                      |                       |
| OCATION]{.underline} |                      |                       |
|                      |                      |                       |
| ~~Radiolocation~~    |                      |                       |
|                      |                      |                       |
| 5.427 5.474 **MOD**  |                      |                       |
| 5.475 **ADD**        |                      |                       |
| 5.472\[A\]           |                      |                       |
+----------------------+----------------------+-----------------------+
| ....                 |                      |                       |
+----------------------+----------------------+-----------------------+

**Reasons:** Provides a worldwide contiguous primary allocation to meet
the required missions of radiolocation systems.

###### USA/ /02 MOD

**5.475** The use of the band 9 300-9 500 MHz by the aeronautical
radionavigation service is limited to airborne weather radars and
ground-based radars. In addition, ground-based radar beacons in the
aeronautical radionavigation service are permitted in the band 9 300-9
320 MHz on condition that harmful interference is not caused to the
maritime radionavigation service. ~~In the band 9 300-9 500 MHz, ground
based radars used for meteorological purposes have priority over other
radiolocation devices.~~

**Reasons:** Priority of the meteorological ground-based radars is
included in added provision RR **5.472\[A\]**.

## USA/ /03 ADD

**5.472\[A\]** In the bands 9 000 - 9 200 MHz and 9 300 - 9 500 MHz,
stations operating in the radiolocation service shall not cause harmful
interference to, nor claim protection from systems operating in the
aeronautical radionavigation service (9 000 - 9 200 MHz) or in the
radionavigation service (9 300 - 9 500 MHz). In the 9 300 - 9 500 MHz
band, ground-based radars used for meteorological purposes have priority
over other radiolocation uses.

**Reasons:** Provide primary allocation to the radiolocation service,
contiguous across 8 500 -- 10 000 MHz, with sufficient bandwidth to meet
emerging requirement for increased image resolution and increased range
accuracy. The radionavigation service and the meteorological
ground-based radars will continue to be protected from stations of the
radiolocation service.