Mission Description

0588-EX-CN-2017 Text Documents

Raytheon IDS

2017-07-14ELS_195173

Raytheon Request for FCC Experimental license
File Number: 0588-EX-CN-2017

Date: 7/14/2017

Purpose of Operation:
Frequency authorization is being requested for the period of April 28, 2017 – October 20, 2017 in X-band
at frequencies between 9.55 – 9.65 GHz, in order to test prototype radar arrays in a relevant
environment. Outdoor testing, across multiple frequencies as noted above is required to assess
hardware compliance with requirements and to continue research and development. Up to two units
will be tested over this range simultaneously.

Technical Synopsis:

Spectrum needed: 9.55 – 9.65 GHz
Power levels requested: 160 W output power, 953.4 kW ERP (peak)
Location of use: Burlington, MA
Each antenna has a +/- 45 degree scan angle
Stop buzzer contacts: Nate Miller (507-421-9830), Geoff Verbeke (508-490-1307), Karen Dyberg
(508-450-9236)

Operation Explanation:
The purpose of this request for Special Temporary Authorization is to test array compliance to RF
performance requirements in a relevant environment. Testing must begin as soon as possible to meet
scheduled deadlines.

Test Summary:

The system will transmit pulsed Frequency Modulated (Chirp) waveforms. For all waveform types, the
maximum pulse duration is 55μs and the maximum duty factor is 22%. It is expected that the radars will
be operated periodically during the STA period, < 8 hours a day, up to 7 days a week, for the duration of
the License.

RF Hazard Calculations and Site Safety Measures:

Initial calculations show that general public exposure limits will be reached at a 2.25 meters distance
and occupational exposure limits at 1.0 meter, using formula (7) from FCC OET Bulletin 65 “Evaluating
Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields”, dated
August 1997. These calculations take into account the highest duty factor of 22% and the raster scan
pattern utilized by the radar.

Raytheon’s RF safety group is involved in all testing that requires free space radiation to ensure that no
personnel are subjected to RF power density levels exceeding the Maximum Permissible Exposure (MPE)
limits of the Part 1.1310 of the FCC Rules and the guidelines in FCC’s OET Bulletin Number 65. An RF
Safety Control Plan will be in place for the tests. The Plan will define the procedures and controls
required to prevent personnel exposure to levels which exceed the MPE. To verify the safety of

personnel, an RF survey will be performed at the initial turn-on of the system. All measured levels,
where personnel have access, must be below the MPE limits before testing can proceed.

Raytheon Technical Point of Contact:

Nathan Miller

System Engineering I&T Lead

Phone: 508-490-2980 (office), 507-421-9830 (cell)

Email: Nathan.P.Miller@raytheon.com

Raytheon Spectrum Manager filing application:

Karen Dyberg

Spectrum Management/RF Safety

Phone: 508-490-2723 (office), 508-450-9236 (cell)

Email: Karen.Dyberg@raytheon.com

Period of Use:

Equipment Information:

Indicate all equipment that will be involved in this operation.

Transmitter info:

Manufacturer: Raytheon

Model: LPR3

Number of units: up to 6

Experimental (Y/N): Y

For each frequency band:

RF output at the transmitter terminals:

160 Watts peak

Effective radiated power from the antenna (if pulsed emission, specify peak power):

The effective radiated power from the antenna, including antenna transmit gain and front-end losses, is
953.4 kW (peak power).

EIRP = Power * gain, Power = 160 W, gain = 39.9 dBi, EIRP = 160 * 9772.37 = 1,563,597 W

ERP = EIRP/1.64 = 953402 W or 953.4 kW

Frequency Tolerance:

Less than 0.001 %

List each type of emission separately for each frequency (basically list the emission designators)

The LPR3 can tune at 1 MHz intervals within the band(s) authorized.

For each tunable frequency authorized, the LPR3 has the following emission designators:

4M7Q3N - 55μsec FM-Pulsed (LP) with a 2 MHz LFM chirp, centered at Ftune – 3 MHz

7M1Q3N - 6μsec FM-Pulsed (SP) with a 2.5 MHz NLFM chirp, centered at Ftune + 3 MHz

The transmit waveform chain-pulse sequence transmits a Long Pulse (LP) then a Short Pulse (SP) for
each pulse repetition interval (PRI). The PRI for a pulse sequence is 256 usec (PRF = 3906.25 Hz). The
Long Pulse (LP) is 55 usec pulse length using a 2 MHz linear FM chirp at a 22% duty factor. The Short
Pulse (SP) is a 6 usec pulse length using a 2.5 MHz non-linear FM chirp at a 2.3% duty factor.

IMPORTANT: The pulse sequence requires 11.9 MHz (LP necessary bandwidth/2 + SP necessary
bandwidth/2 + 6.0 MHz = 4.7/2 MHz + 7.1/2 MHz + 6.0 MHz = 11.9 MHz)

List as appropriate for the type of modulation:

LP: Linear Frequency-Modulated Pulsed (Chirp)

SP: Non-Linear Frequency-Modulated Pulsed (Chirp)

Necessary bandwidth. Explain how determined.

The necessary bandwidth was calculated using the equations in Annex J of the NTIA Manual.

Locations:

The radars will be located on a trailer on the ground in Devens MA, within 0.4 km of the following
coordinates: 42º 34’ 8.50” North, 071º 36’ 10.68” West.

Is a directional antenna (other than radar used)?No.

If yes, give the following info: (Although not necessary for this application, additional antenna detail is
provided below)

Width of beam in degrees at the half-power point:

1.98° Azimuth, 2.1° Elevation at boresight

Orientation in horizontal plane:

+/- 45° Electronically Scanned

Orientation in vertical plane:

0° to 30°, relative to ground horizontal, electronically scanned

Will the antenna extend more than 6 meters above ground, or if mounted on an existing building, will it
extend more than 6 meters above the building, or will the proposed antenna be mounted on an existing
structure other than a building? No.

Overall height above ground to tip of antenna in meters:

No more 3 meters above ground level when installed on a trailer.

Document Created: 2017-07-14 11:11:45
Document Modified: 2017-07-14 11:11:45

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