1、 Radio Altimeter Test Report and Coexistence Study Version 2 April 9,2024 2 Table of Contents 1.Executive Summary.3 2.Introduction.5 3.Radio Altimeter Specifications.8 4.Bandpass Filter Design.10 5.RA Laboratory Test Setup and Inputs.13 5.1 DEKRA Facility.13 5.2 Radio Altimeters Tested.13 5.3 Test S

2、etup.13 5.4 RA Transmitter Leakage.15 5.5 Test Pass/Fail Criteria.15 5.6 Test Heights and Loop Loss.16 5.6.1 Loop Losses in Aviation Industry Studies.16 5.6.2 Loop Losses in CTIA Testing.17 5.7 Receiver Blocking Test Inputs.18 5.7.1.VSG Unwanted Emissions.19 5.7.2.VSG Filter Design.19 5.8 Receiver D

3、esense Test Inputs.21 6.Receiver Blocking Test Results.22 7.Receiver Desense Test Results.23 8.IMT/RA Coexistence Study:Physical Near-Collision.24 8.1 Aircraft Pitch and Roll Angle.24 8.2 Radio Altimeter Antenna Pattern Measurements.25 8.3 Physical Near-Collision Scenario.27 8.4 Real World Factors N

4、ot Considered in the Physical Near-Collision Scenario.28 8.5 Physical Near-Collision Receiver Blocking Study.29 8.6 Physical Near-Collision Receiver Desense Study.30 9.Conclusions.31 3 1.Executive Summary Bringing additional mid-band spectrum to market is essential to meet the growth in commercial w

5、ireless demand.A recent Accenture study highlighted the significant disparity in the amount of licensed spectrum for commercial use,versus unlicensed and federal spectrum allocations.1 A Brattle Group study released in April 2023 further supported the need for additional commercial spectrum,identify

6、ing a spectrum shortfall of more than 1400 MHz of standard-power,licensed mid-band spectrum by 2032.2 The spectrum deficit was similarly underscored in an earlier GSMA report identifying a need for a total of two gigahertz of mid-band spectrum to meet the International Mobile Telecommunications(IMT)