Purpose description

0459-EX-CN-2017 Text Documents

Aerospace Corporation, THE

2017-10-20ELS_199986

THE RF TECHNICAL DETAILS IN THIS LICENSE REINSTATEMENT REQUEST
ARE UNCHANGED FROM THE LATEST PRIOR 0072-EX-ML-2015 LICENSE.

The AeroCube-7, also known as the Optical Communications and Sensor Demonstration
(AeroCube-OCSD) mission will demonstrate the: high-speed optical transmission of
data: 20-Mbytes over 60-seconds with a bit error rate (BER) of 10-4 or better to a 30-cm
diameter telescope from low Earth orbit (LEO). AeroCube-5c will study tracking. It is a
repeat to a prior mission (call sign WG2XVZ). This flight demonstration will consist of
one AeroCube-7 and one AeroCube-5c that are ejected from a CubeSat deployer. The
two vehicles will not be doing any proximity operations.

Both AeroCube-7 (2.2 kg) and AeroCube-5c (2 kg) are Nano class satellites about 4x4x6
inches in dimension. They will be launched on an Atlas V vehicle, planned for August
2015. The orbit is 500 km x 780 km with 64 degree inclination. To assess ground
casualties and to double check the orbit lifetime and space collision probabilities
calculated by The Aerospace Corporation experts, the NASA DAS2.02 program was
utilized. DAS2.02 analysis calculates that the combined debris from both satellites meets
the 25 year lifetime, 100 year total object lifetime and the casualty limit (see
“AC7+AC5c DAS2.02 Output v1” Exhibit).

The AeroCube-7 satellite has two radios. The AdvRadio is built by The Aerospace
Corporation around a Texas Instruments CC1101 transceiver chip. It operates at a fixed
914.7 MHz frequency (see “AdvRadio bandwidth” Exhibit) and outputs 1.3 W. The
second radio is also built by The Aerospace Corporation and is called the AeroCube
Software Defined Radio (SDRadio). It also operates at a fixed 914.7 MHz frequency (see
"SDRadio bandwidth" Exhibit) and outputs 1.3 W. The AeroCube-5c uses one
ADVradio with the same power and characteristics as stated above for AeroCube-7.

When the AeroCube-7 and AeroCube-5c satellites are ejected, they will power on.
However the radios will alternatively turn on in receive mode only. As the satellite flies
over a ground station, the station will continuously beacon towards the satellite. When
the satellite radio hears the beacon, along with the proper serial number code, it will
respond and a link will be established. At that point, the ground station will ask the
satellite for information, typically payload data or onboard telemetry. The satellite will
respond by downlinking the requested information. When the link is lost due to the
satellite passing out of view and the satellite was transmitting, the satellite will try up to 3
seconds to complete the last packet transmitted. The satellite will then revert to a passive
receive mode and wait for the next beacon from a ground station.

We would like to use two types of ground stations to communicate with the AeroCube-7
satellite. The first is a 5-meter diameter dish antenna at The Aerospace Corporation in El
Segundo, CA. At 914.7 MHz, it has 30 dB gain, 5 deg beamwidth and uses a
complementary radio with a 9W amplifier. The second ground station is a portable 2-
meter diameter dish. This has 22 dB gain, a 15 deg beamwidth and uses a
complementary radio with a 9W amplifier. This portable station would be in an RF quiet
area that improves the ground footprint of the ground station network. A typical satellite


pass is 8 minutes long, twice per day – so, the system spends a lot of time not in use. The
antenna parameters and ground station locations are shown in the exhibit “FAA sketch
and antenna figures.”

We are currently requesting a license reinstatement because the AeroCube-7a and
AeroCube-5c satellites are still performing well and the science is very good. In addition,
their longevity in space is its own useful data point for the miniature satellite community.
We request an additional 24 months of licensing.



Document Created: 2017-10-20 17:31:13
Document Modified: 2017-10-20 17:31:13

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