公开(公告)号：US4070675A

公开(公告)日：1978-01-24

申请号：US734699

申请日：1976-10-21

申请人： Sam M. Daniel ,  Eric Jerome Carlson

发明人： Sam M. Daniel ,  Eric Jerome Carlson

IPC分类号： G01S7/02 ,  G01S7/28 ,  G01S7/36 ,  G01S13/52 ,  H01Q1/00 ,  H01Q3/26 ,  H01Q21/06 ,  H04B7/00

CPC分类号： G01S7/2813 ,  H01Q1/00 ,  H01Q21/06 ,  H01Q3/2635

摘要： The present invention involves the use of an adaptive power injection apparatus with an existing antenna having a radiation pattern characterized by a relatively narrow main beam and a plurality of low level sidelobes for the purpose of enhancing the performance of the main antenna in a jamming evironment. The said apparatus consists of an adaptive subarray constrained to maintain a null in the direction of the main beam of the existing antenna. More specifically, the said adaptive array is composed of several individual antennae having relatively wide-beam patterns and combined with the existing antenna through individual IF stages all identical to the IF stage of the existing antenna, individual phase shifters which provide phases necessary for maximum reception from the direction of the main beam of the existing antenna and individual adjustable weights. The weights, which may consist of voltage controlled amplifiers or equivalent devices are adjusted by means of individual signals derived from correlating each corresponding auxilliary antenna signal with the combined signal at the output of the summing network and subsequently subtracting each such signal from the overall average. Setting the weights originally to have a zero average value creates a null in the direction of the main beam. Consequently, subsequent weight adjustments by means of individual adjusting signals whose combined average is zero will maintain the null in the said direction. In an MTI application, the apparatus described would leave the main beam practically intact while serving, at the same time, to mimimize interferring sidelobe power. Thus avoiding undesirable amplitude modulation of the main beam signals that would otherwise arise without the presence of the constrained null.

摘要翻译： 本发明涉及使用具有现有天线的自适应功率注入装置，其具有以相对窄的主波束和多个低电平旁瓣为特征的辐射图，以便在干扰环境中增强主天线的性能。 所述装置包括被限制为在现有天线的主波束的方向上保持零的自适应子阵列。 更具体地说，所述自适应阵列由具有相对宽波束图案的几个单独天线组成，并且通过与现有天线的IF级相同的各个IF级与现有天线组合，各个移相器提供最大接收所需的相位 从现有天线的主波束的方向和各个可调节的重量。 可以由电压控制放大器或等效设备组成的权重通过从每个对应的辅助天线信号与求和网络的输出处的组合信号相关而导出的各个信号进行调整，然后从总平均值中减去每个这样的信号。 将原始设置为具有零平均值的权重在主梁的方向上创建一个零点。 因此，通过组合平均值为零的各个调整信号进行后续的权重调整将保持在所述方向上的零。 在MTI应用中，所描述的装置将在服务期间保持主波束几乎完整，同时使得干扰旁瓣功率成为可能。 因此避免了在不存在受限零的情况下将会出现的主波束信号的不期望的幅度调制。