IFF/SSR & Mode S Basics

Technology Training

Course ID: IFF-ModeS-000-03-TEC

1 Day

Max. 12



  • State the basic techniques of secondary surveillance radar (SSR)
  • Recognise the problem of FRUIT and garbling
  • Consider the advantages of Mode S
  • Differentiate between Mode S acquisition and lockout strategies
  • Characterise the different uplink and downlink formats

Course Information

Target Group

Project managers, engineers, technicians, operators and employees working in the field of radar technology and IFF/SSR


Basic knowledge of radar technology



  • Introduction to Mk X and the sliding window principle
  • Introduction to Mode S and the monopulse principle
  • Advantages of Mode S compared to Mk X
  • Interrogation and reply signals
  • Interrogator code allocation
  • Mode S acquisition and lockout strategies
  • Combined operation of Mode S and Mk X
  • Roll-call scheduling and power management
  • Uplink and downlink formats
  • Introduction to ADS-B/Mode S squitter