1、 Business and General Aviation RA Lab Test Report October 30,2023 2 Table of Contents 1.Executive Summary.3 2.Introduction.5 3.Radio Altimeter Specifications.8 4.Bandpass Filter Design.10 5.CTIA Radio Altimeter Laboratory Test Setup and Inputs.12 5.1 DEKRA Facility.12 5.2 Radio Altimeters Tested.12

2、5.3 Test Setup.12 5.4 RA Transmitter Leakage.13 5.5 Test Pass/Fail Criteria.14 5.6 Test Heights and Loop Loss.14 5.6.1.Loop Losses in Aviation Studies.15 5.6.2.Loop Losses in CTIA Testing.15 5.7 Receiver Blocking Test Inputs.16 5.8 Spurious Emissions Test Inputs.18 6.Fundamental Emissions Test Resul

3、ts.19 7.Spurious Emissions Test Results.20 8.Conclusions.21 3 1.Executive Summary The exponential growth in wireless broadband has prompted spectrum regulators in dozens of countries to reallocate mid-band spectrum for 5G.Many countries are operating standard-power base stations within 3400-3800 MHz

4、,with some extending operations below 3400 MHz.Other countries are expanding International Mobile Telecommunications(IMT)allocations to frequencies above 3800 MHz;Canada,Australia and Korea have allocated spectrum up to 4000 MHz.Japan has 5G operations within 3600-4100 MHz and 4500-4600 MHz1 and is

5、planning future allocations up to 5000 MHz.Other countries are using spectrum above the RA band,including China,which uses 4800-4960 MHz,and Australia,Singapore,Vietnam,and Korea are considering spectrum allocations above 4400 MHz.2 In the United States,federal government systems operate within 4400

6、-4940 MHz and transmit high power levels above horizon.For example,since 2002,the U.S.Navy has operated the Cooperative Engagement Capability(CEC),a communications system that helps to integrate multiple radar sensor measurements into a single air defense view shared across a battlegroup.3 The evolv