论文部分内容阅读
随着干扰与抗干扰技术的发展,要求雷达和地面站有较高的信噪比和抗干扰的能力,因此需要降低天线的副瓣。目前,用得较多的方法有两种: 1.保证反射器口径面上的相位分布,控制口径面上的幅度分布,降低天线的边缘照射电平。如对圆口径反射器实现低副瓣哈敏照射分布,则天线副瓣可降低至-40分贝以下。但是它的主波束展宽,增益下降。要实现原增益,必须加大天线口径,并提高反射器表面的制造精度。此法在多数场合是可以应用的。 2.采用接收对消技术。这可由图1来说明。图中①为主信号,②为补充信号,③为差异信号。由选通电路产生的信号使主天线主瓣区接收信号时,才将信号送往显示器,反之截止。这种方法在雷达机中得
With the development of interference and anti-interference technology, radar and ground stations are required to have higher signal-to-noise ratio and anti-interference ability, so the sidelobe of the antenna needs to be reduced. At present, there are two ways to use more: 1. Ensure the phase distribution on the reflector’s aperture surface, control the amplitude distribution on the aperture surface, and reduce the antenna’s edge illumination level. If the circular aperture reflector to achieve low side-lobe Hamin irradiation distribution, the antenna sidelobe can be reduced to below -40 dB. But its main beam broadens and its gain drops. To achieve the original gain, we must increase the antenna diameter, and improve the manufacture of the reflector surface accuracy. This method is applicable on most occasions. 2. Receiving cancellation technology. This can be illustrated by FIG. 1. The main signal ①, ② for the additional signal, ③ for the difference signal. The signal generated by the strobe circuit so that the main antenna receiving the main lobe signal, the signal will be sent to the display, and vice versa. This method is obtained in the radar machine