SWRA662A January   2020  – September 2022 AWR1243 , AWR1443 , AWR1642 , AWR1843 , AWR1843AOP , AWR2243 , AWR6843 , AWR6843AOP , IWR1443 , IWR1642 , IWR1843 , IWR6443 , IWR6843 , IWR6843AOP

 

  1.   Interference Mitigation For AWR/IWR Devices
  2.   Trademarks
  3. 1Introduction
  4. 2Types of Interference in FMCW Radar
    1. 2.1 FMCW Radar
    2. 2.2 The Radar Equation for Interference
    3. 2.3 Types of Interference
      1. 2.3.1 Crossing Interference
      2. 2.3.2 Performance Analysis for Crossing Interference
      3. 2.3.3 Parallel Interference
      4. 2.3.4 Between Crossing and Parallel Interference
  5. 3Interference Avoidance
    1. 3.1 Standardization: Different Frequency Band and Time Slot for Different Radars
    2. 3.2 Different Starting Time for Parallel Interference
    3. 3.3 Sensing and Avoidance
    4. 3.4 Antenna Polarization
  6. 4Localization and Interference Mitigation
    1. 4.1 Localization
    2. 4.2 Mitigation
  7. 5Dithering and Randomization
  8. 6Conclusion
  9. 7References
  10. 8Revision History

1 Introduction

This white paper discusses the problem of radar-to-radar interference and how it can be managed in TI radar devices. Interference is a major issue for reliable radar functioning, as the number of deployed radars has increased in both automotive and industrial contexts. Thus, the likelihood that one radar’s transmission is received by another radar has also increased. Interference results in a host of issues, such as a degradation in the noise floor leading to missed detections, or blind spots at certain ranges or directions. It can also create ghost objects in certain cases (ghost targets are targets seen by the radar which do not exist).

This paper is only concerned with cases where FMCW radars interfere with each other.

The information presented here covers the following topics:

  • The mechanisms by which interference occurs between FMCW radars and the different types of interferers.
  • The methods to avoid interference and control interference, that is, methods to reduce the probability of interference and methods to detect and repair chirps affected by interference.