| 摘要 |
<p>PURPOSE:To enhance jamming-resistant capacity by transmitting a transmitting radio wave in each transmitting direction while taking synchronism of operation timing by a timing controller and periodically changing over transmission frequency at every scanning. CONSTITUTION:As a transmission antenna, a phased array antenna 1a is used and, as a receiving antenna, a digital beam forming antenna 7 is used. The antenna 7 consists of a plurality of antenna elements 1b, 3, a receiver 4 equipped with a multiplexer, an A/D converter 5 and an operation means 6 discriminating receiving radio waves from different directions at every directions. A timing controller 15 controls the operation timing of a beam scanning controller 2a, a frequency synthesizer 2b and the converter 5 to take the synchronism thereof and periodically changes over transmission frequency at every scanning to control the same.</p> |
