This test builds on and extends a previous NASCTN project that measured the out-of-band (OoB) LTE evolved Node B (eNB) and User Equipment AWS-3 emissions into adjacent L and S frequency bands of AMT systems. While the previous test measured general LTE OoB emissions, this project specifically measures the impact to AMT systems. Results can be used to improve testing protocols that protect existing federal systems during new cellular deployments.
Designed, demonstrated and validated a test methodology to measure the impacts of newly deployed commercial cellular equipment on existing DoD Test Range systems. In particular,
Background: In 2015, the FCC Auction 97 created the AWS-3 band for commercial mobile broadband usage in the United States, which led to the compressed operations frequency band for DoD test range Aeronautical Mobile Telemetry (AMT) systems. However, AMT infrastructure remains largely unchanged, and current Inter Range Instrumentation Group (IRIG) Protocols for mitigating interference does not include specifics for new waveforms such as LTE. In 2017, NASCTN conducted a test campaign for Edwards Air Force Base (EAFB) measuring the out-of-band emissions of commercial LTE smartphones and an evolved node B (eNB) into the newly compressed AMT band. In 2019, this follow-on project was launched to investigate the potential impacts of LTE adjacent band emissions to the AMT systems. The in-band and out-of-band LTE uplink emissions are directly injected into an AMT link in a controlled environment to evaluate the impact.
|Stage 4: Summarize Findings|
|Stage 3: Test Execution||
Data - AWS-3 LTE Impacts on Aeronautical Mobile Telemetry
Data - Laboratory Methods for Recording AWS-3 LTE Waveforms
|Stage 2: Test, Metrology, and Implementation Plan|
|Stage 1: Proposal Screening||Proposal Submitted by EAFB. Approved by NASCTN Steering Committee.|