John A. Volpe National Transportation Systems Center (U.S.)

Presentations

United States

United States. National Transportation Library

This presentation, which was given during the GPS-ABC Workshop VI in Washington, DC on March 30, 2017 details the authors' radiated testing protocols and results. GPS receiver testing was carried out April 25-29, 2016 at the Army

Research Laboratory's (ARL) Electromagnetic Vulnerability Assessment

Facility (EMVAF), White Sands Missile Range (WSMR), NM. Participation included DOT’s federal partners/agencies (USCG, NASA,

NOAA, USGS, and FAA) and GPS manufacturers. Air Force/GPS Directorate conducted testing week of April 18th. 80 receivers were tested representing six categories of GPS/GNSS

receivers: General Aviation (non certified), General Location/Navigation,

High Precision & Networks, Timing, Space Based, and Cellular. Tests performed in the anechoic chamber include: Linearity (receivers CNR estimators are operating in the linear region)

- 1 MHz Bandpass Noise (Type 1)

- 1 MHz In-Band Noise (Type1)

- 10 MHz Long Term Evolution (LTE) (Type 2)

- Intermodulation (effects of 3rd order intermodulation).

The test results can be summarized as follows: 1 MHz AWGN and 10 MHz LTE interference signals ITM

bounds were produced for all emulated GNSS signals; most bounding ITMs showed little sensitivity to interference

signal types (AWGN (1 MHz) and LTE (10 MHz)); certified aviation receiver mask did not bound the masks of

the 6 civil receiver categories; and in-band interference 1-dB degradation levels were consistent

with expectation (-110 to -120 dBm/MHz for the L1C/A ITMs).

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US Transportation Collection