michael cotton [email protected], 303-497-7346 u.s ......michael cotton...
TRANSCRIPT
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Michael Cotton [email protected], 303-497-7346
U.S. Department of Commerce National Telecommunications and Information Administration
Institute for Telecommunication Sciences • Boulder, CO
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Outline
●S-Band Maritime Radar ●Measurement Strategy ●System Development ●Observed Signals and
Patterns ●Occupancy Results ●Summary
July 2012 Institute for Telecommunication Sciences • Boulder, Colorado 2
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S-Band Radar
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SPN-43 Air Marshaling Radar
● Function: As a critical part of U.S. Navy carrier ATC systems, SPN-43 marshals in-bound aircraft before negotiating their final landings.
● Specifications [2]: Frequency: 3500-3650 MHz Pulse width: τ=0.9 (±0.15) μsec Pulse interval: PRF=1125 (±25) pps PRI=889 (±20) μsec Antenna rotation rate: ∂θ/∂t=15 rpm TAnt=4 sec
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(Courtesy: Defense Video and Imagery)
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Measurement Strategy
●Measurement Site: Point Loma, CA on Pacific Coast Near Naval Base
●Duration: Two Weeks ●Channelization: Divide
3500-3650 MHz band into 150x1-MHz channels
●System Design ●Measurement Procedure
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System Design
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Measurement Procedure ● Calibration Conducted once per hour Y-factor: measure noise
figure and gain ● Determine Thresholds ● Frequency Sweep
Measurements 100 x 1-MHz channels Peak-detected with
tdwell=1.5TAnt
● Determine frequencies at max signal levels (f0,k)
● Time-Domain Measurements at f0,k to measure TAnt, PRI, and τ July 2012 Institute for Telecommunication Sciences • Boulder, Colorado 7
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Observed Signals and Patterns
●WiMAX (testing for export) at 3530 MHz and comm at 3542 MHz
●SPN-43 At 3520 and 3530 MHz Multiple systems operating simultaneously in 3550-
3650 MHz range Spectral spreading
●Adjacent-band radar signals ●Systems are intermittently turned on/off
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WiMAX/comm at 3530 MHz and 3542 MHz
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SPN-43 at 3520 MHz and 3530 MHz (Interference?)
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SPN-43 Spectral Spreading
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Multiple Systems Operating Simultaneously and Adjacent-Band Radar Turning On/Off Intermittently
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Occupancy Results
●Channel Occupancy to Quantify Duration that Channel (at a Given Frequency) is Occupied or Unoccupied
●Band Occupancy to Quantify Fraction of Band Occupied at a Given Time
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Channel Occupancy ● Setup Lk = Threshold level X(t) = 1 if signal at t is above Lk and
0 otherwise U = Length of time a signal
continuously exists above Lk V = Length of time between
transmissions
● Measurements x1, x2, …, xJ are represented by a
sequence of 0’s and 1’s J = Number of measurements T = Measurement duration
● β = Mean channel occupancy
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=𝐸 𝑼
𝐸 𝑼 + 𝐸[𝑽] , where E[·] denotes expected value
( At frequency f )
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Channel Occupancy U and V distributions
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L (dBm) α β
-74 0.059 0.070
-77 0.105 0.121
-80 0.163 0.186
-83 0.231 0.267
-86 0.293 0.343
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Band Occupancy
● Setup Lk = Threshold level Δf = channel bandwidth Y(f) = 1 if signal at f is above Lk and 0
otherwise n = Number of channels occupied
● Measurements y1, y2, …, yN are represented by a
sequence of 0’s and 1’s N = Number of measurements NΔf = Frequency span of measurement
● α = Mean Band Occupancy
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=𝐸 𝒏𝑁 , where E[·] denotes expected value
( At time t )
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Band Occupancy Vs Threshold
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Band Occupancy Probability Statistics
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L (dBm) α P(n/N=0) P(n/N=1)
-74 0.059 0.66 0.01
-77 0.105 0.60 0.01
-80 0.163 0.55 0.03
-83 0.231 0.49 0.07
-86 0.293 0.45 0.13
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Summary ● There is Whitespace Available in the 3550-3650 MHz band
at the High-Usage San Diego Site. Depending on threshold: Mean Band Occupancy: 6 – 30% Probability Band was Empty: 45 – 66% Probability Band was Full: 1 – 13% Mean Time Channel was Continuously Occupied: 0.6 – 1.4 hrs Means Time Channel was Continuously Vacant: 2.6 – 7.7 hrs
● Suggestions for Future Work Measure Other Sites – E.g., Sites with Lower Usage Integrate Front-End into Antenna Reduce Entire System into Remote Unit for Monitoring Deploy Monitoring Units and Accumulate Data in Dashboard Evaluate Interference Thresholds and Propagation Effects Integrate Spectrum Sharing Database into Monitoring System
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References 1. M.G. Cotton, et al, “ISART 2011 Proceedings –
Developing Forward Thinking Rules and Processes to Fully Exploit Spectrum Resources: An Evaluation of Radar Spectrum Use and Management,” NTIA SP-12-485, Boulder, CO, Jul. 27-30, 2011.
2. Military Standardization Handbook, MIL-HDBK-162B, Dec. 1973.
3. Agilent, “Spectrum and Signal Analyzer Measurements and Noise,” Agilent Application Note,
4. A.D. Spaulding and H. Hagn, “On the Definition and Estimation of Spectrum Occupancy,” IEEE Transactions on EMC, Vol. EMC-19, No. 3, Aug. 1977.
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System Development
●Code Development and Dry-Run: 2700-2900 MHz Airport Surveillance Radar (ASR) Band around Boulder, CO
●Preliminary Data from RSMS SD Measurements ●First Days at Point Loma, CA Site
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Code Development 2700-2900 MHz ASRs around Boulder, CO
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-2.6 dB 24.2 dB
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Dry Run 2700-2900 MHz ASRs around Boulder, CO
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Preliminary SD Data from RSMS
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First Days at Point Loma Site ● What is the cause of the strong
measured signals saturating the entire band? Spectrum analyzer overload? Amplifier compression? Actual signal?
● Evaluation Checked individual components Added attenuation to check linearity Changed code to track spectrum
analyzer overload Swapped in high-power amplifier to
ensure analyzer overloads first Measured signals with only
spectrum analyzer
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