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May 12, 2015 NTIA/NIST Spectrum Monitoring Pilot Program Jeff Wepman NTIA/ITS Mike Cotton, Program Lead NTIA/ITS Michael Souryal, Program Lead NIST/CTL 1
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NTIA/NIST Spectrum Monitoring Pilot Program · NTIA/NIST Spectrum Monitoring Pilot Program Jeff Wepman – NTIA/ITS ... •Test environment for authorized users

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  • May 12, 2015

    NTIA/NIST Spectrum

    Monitoring Pilot Program

    Jeff Wepman NTIA/ITS

    Mike Cotton, Program Lead NTIA/ITS

    Michael Souryal, Program Lead NIST/CTL

    1

  • May 12, 2015

    Overview

    Program Goals & Major Tasks

    Deployment of RF Sensor Systems

    Measured Spectrum Occupancy Database (MSOD)

    RF Sensor Systems Focus for presentation Sensor System Architecture

    COTS Sensor Classification

    RF Performance Testing

    2

  • May 12, 2015

    Program Goals

    Develop infrastructure Acquire, amass spectrum data

    Data avail to spectrum community via web

    Establish, implement best practices spectrum data acquisition

    3

  • May 12, 2015

    Major Program Tasks

    Design, develop, deploy sensor systems to collect spectrum usage data

    Develop sensor system network

    Spectrum data acquired by network of RF sensor systems

    Develop MSOD

    RF Performance testing of COTS sensors

    Goal: build cost/capability/performance matrix

    4

  • May 12, 2015

    5

    IP Network

    ITS Boulder (Local) Site Remote Sites

    Wireless

    or Wired

    EthernetData Staging

    Server

    COTS

    Sensor

    RF

    Preselector

    Measurement

    Controller

    COTS

    Sensor

    RF

    Preselector

    Measurement

    Controller

    COTS

    Sensor

    RF

    Preselector

    Measurement

    Controller

    Sensor System Network

  • RF Sensor System Deployment

    Network of six 3.5 GHz sensor systems

    Maritime radar monitoring

    Along East and West coasts

    Sensor system deployment status

    Current: Virginia Beach

    FY15: San Diego, San Francisco,

    Florida Keys

    FY16: Astoria, Cape Cod

    May 12, 2015

    6

    MSOD

  • RF Sensor System Deployment

    Currently developing prototype sensor system

    LTE monitoring in 1695 1710 MHz & adjacent

    bands

    Possible deployment: NOAA Meteorological

    Satellite Earth Stations

    Deployment planned FY16

    May 12, 2015

    7

  • Measured Spectrum Occupancy Database

    May 12, 2015

    8

    Web

    Browser

    Meta

    Data Web Server

    + Database

    Web Server

    + Database

    Sensor Sensor

    Sensor

    System Sensor Sensor

    Sensor

    System

    Web

    Browser

    Organization A Organization B

  • Measured Spectrum Occupancy Database

    Standardized data transfer specification

    Based on Java Script Object Notation JSON

    Flexible allows different types of data

    Provides threshold-based band occupancy

    statistics & amplitude vs. freq. data

    Test environment for authorized users

    Planned Jan 2016

    May 12, 2015

    9

  • May 12, 2015

    General Sensor System

    Architecture

    10

    PreselectorCOTS

    Sensor

    Measurement

    Controller

    Control

    Data

    Wired or

    Wireless

    Ethernet

    IP Network

  • May 12, 2015

    COTS Sensor Classification

    Classify sensors into 5 tiers

    Differentiated by capability, intended purpose, loosely by cost

    11

    High Tier General purpose lab equipment

    Spectrum, vector signal, real-time analyzers

    Use superhet front-end arch

    Cost: ~ $25,000 or more

    Mid Tier DFT-based sensors

    Unattended RF data collection & outdoor use

    Use superhet RF front-end arch

    Cost: ~ $15,000 - $20,000

  • May 12, 2015

    COTS Sensor Classification 12

    Low Tier Designed as general experimental SDR receivers

    Can configure to operate like mid-tier sensors

    Not for outdoor use

    Use direct conversion front-end for cost savings

    Cost: ~ $1000 - $5000

    Very Low Tier Reduced cost versions of low-tier sensors

    Geared toward hobbyist

    Single IC RF front-ends

    Cost: a few hundred dollars

    Extremely Low Tier DVB-T television USB stick receiver

    Can be modified to be SDR receiver

    Cost: ~ $20

  • May 12, 2015

    RF Performance Testing

    Two types COTS sensor tests

    Fundamental RF performance tests

    Example: DANL, Signal Overload, TOI Tests

    Detection of simulated real world signals

    Example: Compare band occupancy for simulated SPN-43 radar emissions

    Motivation for testing

    13

  • May 12, 2015

    RF Performance Testing

    Increasing number of spectrum monitoring efforts wide variety sensors

    Measured spectrum data integrity crucial

    Spurious responses or intermod generated must not be mistaken real signals

    Comparing specs between mfr. difficult

    Use different parameters to specify sensors

    Even with same parameters, conditions likely different

    14

  • May 12, 2015

    RF Performance Testing

    Reduction in sensor cost

    Desirable/necessary new paradigm spectrum monitoring Continuous, long-term spectrum monitoring

    Many locations simultaneously

    Performance testing important

    Is lower-tier/cost sensor suitable for given monitoring scenario?

    Examples

    15

  • May 12, 2015

    16 DANL Test Examples High & Mid -Tier

  • Phase Noise Test Example

    May 12, 2015

    17

  • May 12, 2015

    Conclusions Deploying network of six 3.5 GHz sensor systems

    Developing prototype LTE sensor system

    MSOD test environment planned - Jan 2016

    Developing comprehensive RF perf. test plan

    Beginning to implement tests in laboratory

    RF performance of sensors important Integrity of spectrum data crucial

    Clearly see signals that are actually present

    Must not count sensor artifacts as signals!

    18