HIWRAP Dual Frequency Doppler Radar (IMAGE) NASA/Goddard Space Flight Center Caption The HIWRAP dual frequency Doppler radar will hang under the Global Hawk. On the left, the golden disc is the antenna and on the right, the two small white discs are the radar beam transmitters, one for each of two frequencies. The whole apparatus spins while flying. Credit Bill Hrybyk / NASA Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.