ANSWERS TO REVIEW QUESTIONS

A21. Beam broadening increases pulse volume resulting in decreased signal strength. A22. The presence of sidelobes leads to confusion in interpreting targets because short- range, non-meteorological targets are displayed along with main beam targets. A23. An increase in beamwidth or target distance. A24. Pulse length. A25. The bending of (electromagnetic) waves. A26. Moisture. A27. N-units normally decrease with height. A28. Subrefraction. A29. A strong inversion, A30. The existence of buildings, trees, or rough terrain near the radar antenna. A31. Backscattering. A32. Absorbers are mainly oxygen and water vapor. A33. A means to measure motion. A34. The outstanding capabilities of the WSR-88D include velocity detection, increased power and sensitivity, and the integration of high tech computers. A35. It increases. A36. A phase shaft is an observable repositioning of a point on a wave between successive transmissions. A37. In degrees. A38. By measuring phase shift, wavelength, and the time interval between pulses. A39. As a target moves more perpendicular to a radar, the velocity detected becomes less than the true velocity. A40. Velocity aliasing is a process that causes a Doppler radar to display untrue velocities because of the motion of the target. A41. The Nyquist velocity is the maximum unambiguous velocity that can be detected at any given pulse repetition frequency (PRF). A42. 29.4 mps (57 knots). A43. Velocity aliasing and range folding. 2-57