| 摘要 |
<p>PURPOSE:To decide whether radio wave jamming exists or not in accordance with a relative distance of a target and a flying object after detecting plural targets or jamming by radiating a wide angle beam for transmission, forming a multi-beam for reception and executing a simultaneous signal processing. CONSTITUTION:As for receiving signals Sn (n = 0, 1... N-1) received by each element antenna 16, receiving beams Sk (k = 0, 1... N-1) are formed simultane ously by a digital beam forming device 23. The receiving beams Sk are sent to a monopulse sum/difference computing element 24, and a monopulse sum signal SIGMA and a monopulse difference signal DELTA are calculated. Subsequently, a measured angle theta of each beam is calculated by a measured angle computing element 25, and sent to an angle tracking circuit 26. Next, by a comparing circuit 30, whether a jamming radio wave exists or not is decided by using output signals of a receiving power computing element 28 and a frequency tracking circuit 29. In a deciding circuit 32, signals from the comparing circuit 30 and a duty cycle detector 31 are received, and when it is decided that conditions of both of them become uniform, a signal is sent to a beam controller 33, and tracking to a radio wave jamming source is started.</p> |
