NASA Man-Made Noise Floor Study Summary Program Results .


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2. Justification
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NASA Man-Made Noise Floor Study Summary Program Results National Spectrum Managers Association May 25, 2005 James E. Hollansworth NASA Headquarters

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Measurements of Man Made Spectrum Noise Floor Rationale & Objective: In many examples new remote advances bolster applications in unlicensed groups or "underlay" existing administrations on an unlicensed premise. This could bring about a debasement of the clamor floor condition. There is a need to analyze whether the watched commotion floor results are steady with material directions representing those groups NASA is especially worried with clamor floor in groups utilized for essential security and logical purposes NASA Partnership with the Department of Transportation, Clemson University, & Stanford University Funding by NASA and DOT Published as NASA CR-2004-213551, accessible at http://ntrs.nasa.gov/

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Stanford University led a study in the L1-Band (1563.42 - 1587.42 MHz), Unified S-Band (2025-2110 MHz), and Industrial Scientific and Medical Band (2400 - 2482.5 MHz) Clemson University led a study in the Passive Sensing Band (23.6 – 24.0 GHz) L1 - Band S - Band 2.4 ISM - Band Passive Sensor Band Measurements of Man Made Spectrum Noise Floor

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Measurements of Man Made Spectrum Noise Sample Survey: San Jose Downtown, CA GPS L1 Band Measurements Equipment and Location GPS L1-Band Temporal, Spectral, Angular, & Statistical Analysis

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Key Significantly more noteworthy than regular commotion control Slightly over the common commotion control Indistinguishable from the characteristic clamor control Stanford Measurement Results Stanford University Survey Results The GPS L1 Band is moderately perfect and calm The Unified S Band has emanations because of non-Government benefits The 2.4 GHz ISM Band is noticeably noisier than controlled groups Urban regions are noisier than country situations Airports and harbors are for the most part like urban territories Average Received Power (in dBm/MHz)

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Clemson Measurement Results Clemson University Survey Results at 24 GHz Overall no obvious levels of man-made radiation Nineteen phantom pinnacles were, nonetheless, identified at two air terminal locales 3 in a solitary recurrence at Hartsfield Jackson Airport 10 at the Oconee County Airport Anomalies conceivably identified with satellite support of business trucks

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Conclusions In groups open to open use, the power range is far over the warm clamor floor In limited groups the power range is near the warm clamor floor Current standards give off an impression of being viable in deciding the radio condition Future controls ought to be touchy to the capacity of each band: Each band bolsters diverse sorts of utilizations Some groups bolster basic frameworks and can\'t endure operational disappointment and should be shielded from any impedance Other groups can endure a specific level of obstruction while requiring more data transmission Restricted groups ought not be considered for operations of unlicensed and unregulated administrations

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For extra data contact: James E. Hollansworth (Jim) NASA Headquarters (202) 358-4675 jhollans@hq.nasa.gov

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