Antenna Registration Question 4 Directional Antena Information

0935-EX-CN-2018 Text Documents

Systems & Technology Research

2018-11-20ELS_220041

Radar Development and Testing on Government Contract
RE: Antenna Registration Q4: Directional Antenna Information, Exhibit
File Number: 0935-EX-CN-2018
Confirmation Number: EL775632
Date: November 19, 2018

Experiment Overview
Systems & Technology Research (STR) is leading efforts on the DARPA radar
development project called “Radar Net.” We are supporting a Phase 2 development
effort.

This phase will involve performance testing of our system, requiring a larger
footprint in both the Boston, MA area as well as the Ann Arbor, MI area, compared to
those conducted under our existing STA (WI2XGL). A maximum of two aircraft will
be outfitted with systems and simultaneously operating in the same region with
identical radar equipment. Both systems will employ identically constructed phased
array antennas.

Altitudes will still be constrained to < 10,000 ft, using the same antenna systems as
previously used. However, an expanded instantaneous bandwidth (800 MHz) will
be required to be tested, hence the expanded action frequency range between 8.1
and 8.9 GHz, as well as 9.2 and 10.2 GHz, are being requested in the Boston area.

This effort will be expected to begin in January, 2019, and extend for up to 24
months or contract end. The primary area of operation will be in the Boston, MA
region, with occasional operations in the other areas.

For all computations we consider the highest desired bandwidth and ERP of the
systems.

Antenna Parameters:
The antenna is an electronically steered directional rectangular antenna with a 3dB
azimuth beamwidth of 2.4 degrees and a 3dB elevation beamwidth of 10 degrees
using the full array. In certain configurations we may have a wider beam, but the
ERP will be reduced as a result.

The antenna can radiate in either horizontal or vertical polarizations at any given
time, but not simultaneously.

The antenna has an effective scan limit of 60 degrees off boresight.


Power Parameters:


              600 W. Cummings Park, Suite 6500, Woburn MA 01801 www.stresearch.com


The radar transmits with a 10.5% duty cycle with pulses no longer than 100
microseconds. The peak transmit power is 1135 Watts. With the 10.5% duty cycle,
the average transmit power is 120 Watts. The maximum antenna transmit gain is
31.34 dB, or a factor of 1361. So the peak ERP is 1135 * 1361 = 1.55 MW. The
average ERP is 120 * 1360 = 163 kW.


Operations / Flight Routes:
Flights are currently planned for the Boston, MA area primarily near Lawrence, MA (KWLM)
but at times extending south to operations near Cape Cod CGAS (KFMH) and north to
Portsmouth Intl (KPSM). These locations will be where a majority of the flight operations
will occur, not continuously, but rather as discrete test events during the execution of the
contract.

Additionally, other flight operations near and surrounding North Texas Regional Airport
(KGYI), Ann Arbor, MI and Ypsilanti (KYIP) and Hunstville, AL will be conducted.

A nominal flight altitude of 8500 ft MSL is planned, but could vary from 4500 ft to 9,000 ft
MSL depending on weather conditions and VMC minimum requirements.




                600 W. Cummings Park, Suite 6500, Woburn MA 01801 www.stresearch.com



Document Created: 2018-11-19 20:06:12
Document Modified: 2018-11-19 20:06:12

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