JHUAPL Rocket Plume RF Attenuation Test Description

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The Johns Hopkins University Applied Physics Laboratory (JHU/APL

2018-12-13ELS_221186

JHU/APL Motor Plume Measurement • Purpose - Measure the attenuation of RF signal passing through a rocket motor plume to determine plasma properties and validate plume simulations • Method - Use a Vector Network Analyzer (VNA) to transmit an RF beam parallel to the ground, at a height of a few feet. The transmitted beam intercepts the plume of the horizontally fired rocket motor. The test facility housing the rocket motor and the transmitting VNA is 3 sided with the motor firing toward the outside. • Operational Area - 33°37'2.15"N, 92°40'37.61"W (Lockheed Martin Test Facility, East Camden, AR), 100 ft diameter test zone • Vector Network Analyzer Description - Manufactured by Agilent - 8mW Tx Power - RF Freqs: 2 – 20 GHz sweep - Emission: Wideband LFM - PRF: CW - Antenna:  Gain: 20 dBi,  Beamwidth: 60⁰ 3dB H/V • FCC STA Request - Test window: 3/1/19 to 8/1/19 - Transmission duration: 10 min/test, up to 10 times/day - Operation Window: Up to 5 days of testing within 5 month Test Window 13 December 2018 3

Test Method • RF Waveform: 2-20GHz Wideband LFM • Within a 100 foot diameter area. • Maximum 10 minutes duration, 0 to 5 times per day between 6 AM and 6 PM • maximum of 5 days during an 8-day window within 100 feet diameter 3/1/2019 – 8/1/2019 operational area • RF absorber sheets will be placed as shown to confine indicated on map and minimize RF scatter beyond the immediate test area. 13 December 2018 4


Document Created: 2018-12-13 14:05:30
Document Modified: 2018-12-13 14:05:30
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