11 Analysis of AeroCube NonInterference

0827-EX-CN-2018 Text Documents

Aerospace Corporation, The

2018-10-15ELS_218117

Analysis of AeroCube Non-Interference with 902-928 MHz Band Technical POC: Andrew Chin The Aerospace Corporation Andrew.Chin@aero.org 310-336-5994 Scope Through analysis, show that the AeroCube space service at 914.7 MHz does not interfere with protected land base station services in the 902-928 MHz band. Protection Criteria for the IMT Systems For non-interference, space services require field strength below the following values: The minimum field strength allowed is 16 dBμV/m. Only interference with the Receiving Base Stations is considered because the Receiving Mobile Stations are outside the frequency band of the AeroCube transmitter. Analysis From Recommendation ITU-R P.525-3, the field strength is calculated as √30𝑝 𝑒= 𝑑 where: e: r.m.s. field strength (V/m) p: equivalent isotropically radiated power (EIRP) of the transmitter in the direction of the point in question (W) d: distance from the transmitter to the point in question (m).

From the AeroCube FCC filing, there are two satellites, both with two radios operating at 914.7 MHz, and both radios have the same ERP. The ERP is 1 W, and converting from ERP, the EIRP, p, is 1.64 W. The distance, d, is 450 km. The electric field strength, e, can then be calculated as: 𝑒 = 1.56 ∙ 10−5 V/m = 11.89 dBμV/m. Conclusion For the AeroCube spacecraft parameters, the electric field strength is calculated to be 11.89 dBμV/m at the land mobile service system. This value is below the minimum non-interference requirement of 16 dBμV/m for Receiving Base Stations. Therefore, the AeroCube spacecraft will not interfere with Receiving Base Stations in the 902-928 MHz band or the Receiving Mobile Stations in the 925-960 MHz band.


Document Created: 2018-04-12 12:11:06
Document Modified: 2018-04-12 12:11:06
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