### United States of America

### DRAFT PROPOSAL FOR THE WORK OF THE CONFERENCE

####### Proposal for Resolution 606

**Agenda Item 1.15b**: to review the results of studies concerning the
radionavigation-satellite service in accordance with Resolutions **604
(WRC-2000)**, **605 (WRC-2000)** and **606 (WRC-2000)**;

**Background Information**: WRC-2000 agreed to additional allocations to
the radionavigation-satellite service (RNSS) (space-to-Earth) in the
1 260-1 300 MHz band making the entire 1 215-1 300 MHz band available
for RNSS. This band was also allocated to the RNSS (space-to-space). The
band 1 240-1 300 MHz is also allocated on a co*-*primary basis to
radiolocation and radionavigation services and is used for long-range
primary radar systems. Studies were conducted pursuant to the provisions
of Resolution **606 (WRC-2000)**. Among other things, Resolution **606**
**(WRC-2000)** called for studies on "the need for a power flux-density
limit concerning the operation RNSS (space-to-Earth) systems in the
frequency band 1 215--1 300 MHz in order to ensure that the
radionavigation-satellite service (space-to-Earth) will not cause
harmful interference to the radionavigation and radiolocation services."
Also in Resolution **606 (WRC-2000)**, WRC-2000 resolved that no
additional constraints are to be placed on RNSS systems operating in the
1 215-1 260 MHz band.

The Global Positioning System (GPS), an RNSS system which operates on
1 227.6 MHz (24 MHz bandwidth). Currently, this signal is used for high
precision GPS in high productivity applications, such as machine
guidance in survey, construction, agriculture, and mining. This signal
has been transmitted at its current power level since 1978 and there has
been no reported harmful interference to other users of the band. This
has been accomplished without the need for power flux-density (pfd)
limits in the Radio Regulations (see also Recommendation ITU-R M.1088).
There are large numbers of GPS receivers operating in the band
1 215-1 260 MHz.

It is noted that the GLONASS RNSS system has also operated successfully
in the 1 215-1 260 MHz band for many years without causing harmful
interference to other co-frequency systems. This is accomplished on the
basis given in Recommendation ITU-R M.1317 and includes a signal of up
to --133 dB W/m^2^/MHz. Operational experience with current GPS and
GLONASS system characteristics in the 1 215-1 260 MHz band, has not led
to any reports of harmful interference being caused to existing radar
systems.

As RNSS system characteristics are expected to evolve and new systems
are planned, analyses are being conducted to determine the impact of a
more powerful RNSS (space-to-Earth) signal on radar systems in the
1 215-1 300 MHz band. Some administrations have planned RNSS systems
that have a future requirement to produce a pfd level higher than --133
dB (W/m^2^/MHz) in the 1 215-1 260 MHz band.

Users of radars in the band will be protected in accordance with the
provision of **No. 5.329**.

**Proposals**:

**USA/ /1**

# NOC

1** **215-1** **240 MHz

**Reasons**: Noting **No. 5.329**, there is no need for a pfd limit to
be imposed in 1** **215-1** **300 MHz band. Some administrations have
successfully operated RNSS and radar systems in the 1** **215-1** **260
MHz band for more than 23 years with no reported harmful interference.

**USA/ /2**

**MOD**

**5.329** Use of the radionavigation-satellite service in the band
1 215-1 300 MHz shall be subject to the condition that no harmful
interference is caused to, and no protection is claimed from, the
radionavigation service authorized under No.** 5.331**. ~~See also
Resolution **606 (WRC‑2000)**.~~

**Reasons**: Consequential to the determination that there is no need
for a pfd limit to be imposed in the 1 215-1 300 MHz band.

**USA/ /3**

**SUP**

**~~RESOLUTION 606 (WRC-2000)~~**

**Reasons**: Consequential to the determination that there is no need
for a pfd limit to be imposed in the 1 215-1 300 MHz band.