What causes ground clutter on radar?

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Tags

1. #serious
2. #returned
3. #chaff
4. #typically
5. #animals
6. #particularly
7. #insects
8. #atmospheric
9. #turbulences
10. #unwanted
11. #performance
12. #ground
13. #electronic
14. #clutter
15. #issues
16. #reference
17. #systems
18. #radars
19. #radar
20. #cause
21. #echoes