Low-Cost Measurement for a Secondary Mode S Radar Transmitter

Abstract

Abstract-Alow-cost, multiple-purpose, and high-precision timing test setup for the measurements of secondary Mode S radar transmission signal was proposed. The goal was to fully guarantee compliance of the proposed transmitter under test with the really hard International Civil Aircraft Organization requirements using traditional measurement equipment, which was difficult or even impossible to ensure up to now. The low-cost structure proposed in this paper allows the user to perform measurements independently of the measurements performed by the pieces of test equipment shelled by the manufacturer of radar, which is a very important aspect since the independence of the verifications is a mandatory requirement established by the safety standards of civil aviation. The proposed setup has been used to verify several transmitters with some defects that are not detected by monopulse secondary surveillance radar specific pieces of test equipment that are focused on more high-level functionalities. It also is valid and it has been used, as a general-purpose setup, for testing other radio navigation aids. Index Terms-Commercial-off-the-shelf(COTS) equipment, differential phase shift keying, envelope and phase measurements, global positioning system disciplined oscillator (GPSDO), Mode S radar, monopulse secondary surveillance radar (MSSR), radar measurements, transmitter measurements.