ANSWERS TO REVIEW QUESTIONS

ANSWERS TO REVIEW QUESTIONS A1. An electromagnetic wave is radiation energy in the form of a sine wave with both electrical and magnetic properties. A2. Radio (microwave) region. A3. Centimeters or degrees. A4. Shorter wavelengths provide finer detail. Longer wavelengths are more effective when evaluating larger targets. A5. Frequency is the number of completed wave cycles per second, measured in hertz. A6. 100 GHz. A7. By using the decibel system. A8. Reflectivity is the amount of energy returned from an object and is dependent on the size, shape, and composition of the object. A9. The antenna. A10. The sensitivity of a radar is the measure of the radar’s internal interference against the minimum signal it is designed to detect. A11. Longer pulses return more power, thus increased target information and data reliability. A12. In seconads or kilometers. A13. Resolution refers to the ability of the radar to display multiple targets clearly and separately. A14. The rate at which pulses are transmitted per second. A15. An increase in PRF provides greater target detail; however, the maximum range of the radar is reduced. A16. The inability of the radar to distinguish between return pulses, producing ambiguous (unreliable) range information. A17. 93 miles (81 nmi). A18. A pulse from a distance outside the radar’s normal range returns during the next pulse’s listening time, causing confusion. A19. As the pulse moves away from the radar, volume expands and power density decreases. A20. The smaller beam. 2-56