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什么是相控阵技术
铱动科技 类型：转载
日期：2008/4/18
责任编辑：蔡怡俊
É=
60;么是相控阵技术
=
8129;动科技
类型：&#=
36716;载 日期：=
2008/4/18
责任编辑：蔡怡Ì=
26;
EIRP(Effective Isotropic Radi=
ated
Power) 有效全×=
21;辐射功率
EIRP也称为Ļ=
61;效全向辐射功率，它=
的定义是地球站或卫=
6143;的天线发送出的功=
5;（P）和该天线增=
0;（G）的乘积，即ᦂ=
6;EIRP=3DP*G。如果用dB计算，则为EIRP(dBW) =3D P(dBW) + G(dBW)。 EIRP表示了发送功=
9575;和天线增益的联合ਠ=
8;果。
相控阵，就是=
;由许多辐射单元排成&#=
38453;列形式构成的走向ä=
25;线，各单元之间的辐=
射能量和相位关是可=
0197;控制的。典型的相৷=
1;阵是利用电子计算机&=
#25511;制移相器改变天线=
380;径上的相位分布来实=
;现波束在空间扫描，&#=
21363;电子扫描，简称电û=
95;。相位控制可采用相=
位法、实时法、频率=
7861;和电子馈电开关法Ӎ=
0;在一维上排列若干辐&=
#23556;单元即为线阵，在=
004;维上排列若干辐射单=
;元称为平面阵。辐射&#=
21333;元也可以排列在曲ń=
47;上或曲面上．这种天=
线称为共形阵天线。=
0849;形阵天线可以克服ಬ=
7;阵和平面阵扫描角小&=
#30340;缺点，能以一部天 =
447;实现全空域电扫。通=
;常的共形阵天线有环&#=
24418;阵、圆面阵、圆锥ƃ=
54;阵、圆柱面阵、半球=
面阵等。
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