Description of Amendment

0024-EX-CN-2017 Text Documents

HawkEye 360, Inc.

2017-09-19ELS_198526

196 Van Buren Street #450 Herndon, Virginia 20171 (571) 203-0360 // www.he360.com RE: Amendment 0024-EX-CN-2017 HawkEye 360. Inc. (HE360) hereby amends the above-referenced application, which was filed on January 10, 2017, as follows: 1. U.S. ground station location and frequencies The U.S. ground station will be relocated to 196 Van Buren St, Suite 450, Herndon, VA 20170. The latitude and longitude of this new location is: 38° 57’ 14.51” N -77° 23’ 14.95” W. This ground station will only operate in the 432-438 MHz (uplink) and 2200-2290 MHz (downlink) bands, i.e., the secondary links. HE360 is removing the initial request to operate in the 2025-2110 MHz (uplink) and 8025–8400 MHz (downlink) bands, i.e. the primary links, at the U.S. ground station. HE360 will use leased KSAT facilities in Svalbard, Norway for transmissions in the primary links to/from the proposed satellite constellation. HE360 may also in the future lease facilities for a ground station in Canada. HE360 will coordinate any such potential future operations with affected operators. 2. Satellite Payload The satellite payload is comprised of an RF receiver, commercial-off-the-shelf antennas (see Table 1 below) and RF “System on a Chip” technology combined with a reprogrammable field programmable gate array (FPGA). The payload has a receive-only function and cannot transmit. The combination of antenna frequency ranges and RF receiver chip tuning range is displayed in the graph below. The payload will collect and record information corresponding to the observable, environmental characteristics associated with RF signals within the frequency ranges of the antennas aboard the spacecraft. HE360 will downlink metadata for collected signals, containing time of arrival, frequency of arrival, bandwidth, power, modulation type, and other similar information. HE360 will use this metadata to geolocate the signal transmission. HE360 has the technical capability to downlink collected raw data, but such use will be limited in part due to bandwidth constraints. Table 1 – Receive Signal Tuning Frequency Ranges Antenna Types Frequency Ranges Gain VHF Dipole 100 – 182 MHz 1.5 dBi UHF Dipole 382 – 422 MHz 1.0 dBi ADS-B Patch 1090 MHz (on frequency only) 5.8 dBi 1

L-band Patch 1.6 – 1.7 GHz 6.3 dBi S-band Patch 2.9 – 3.1 GHz 7.0 dBi Molded Button Antenna 1.4 – 7.0 GHz 5.0 dBi Horn Antenna 6.0 – 15.0 GHz 10.1 dBi HE360 will fully demodulate only those signals identified in Table 2 below, which are intended for general reception. Table 2 – Demodulated Signals Signals Frequency Bands Use Automatic Identification System AIS 1 (161.9625MHz – 161.9875 MHz) Reception (AIS) Channels 1,2,3,4 AIS 2 (162.0125MHz – 162.0375 MHz) AIS 3 (156.7625MHz – 156.7875 MHz) AIS 4 (156.8125MHz – 156.8375 MHz) Emergency Position-Indicating 406 MHz Reception Radiobeacon (EPIRB) Automatic Dependent 1090 MHz Reception Surveillance – Broadcast (ADS-B) 3. Satellite cross-link transmissions Each of the experimental spacecraft will contain a low-power S-band radio to conduct experimental satellite cross-link transmissions. The cross-link radio is included to facilitate demonstrations for future consideration, and the cross-link provides no operational capability. The cross-link radios will operate at a center frequency of 2410 MHz, have a power level of 100 mW (22.1 dBm), and transmit a 10 kHz signal. HE360 does not intend to operate cross-link tests or demonstrations more frequently than once a month and for periods of no more than 10 mins. Experimental equipment: SFL low rate Space to space cross link radio ERP Mean Peak: 26 dBm Emission designator: 10k1D Table 3 below provides the technical parameters for the cross-link transmitter. 2

ISL Radiation Pattern neaso A Guve im — doesizescainasion BC tastoutve FreasearGrterivodeg — doesizescainancn BC tastoutve Frease arGrt Pr=ssoeg — doesizescainancn BC tastoutve FreasearGrtPi—soceg — doesizescainancn BC tastoutve rroorn «rone rtosseg 10

Table 3 – Cross-link Technical Parameters 4


Document Created: 2017-09-19 16:05:06
Document Modified: 2017-09-19 16:05:06
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