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在相控阵天线中,应用具有随机相位反转的等幅单元产生有效的锥削幅度分布,以降低副瓣的新颖方法在本文的第一部分中已作了叙述。它是改变某些移相器的第一位数字并使其叠加到控制波束的相移上。如果把一位相位加权的方法加以扩展,使用只有两位的移相器,那么就可以同时控制波束和应用一个有效的锥削幅度分布。这种方法既能降低第一副瓣(通过锥削),又能降低由于使用仅有两位移相器控制波束所引起的寄生副瓣。由于随机过程的方差增大,峰值副瓣电平并没有达到象一位相位加权的副瓣电平。对于128个单元的天线阵,其峰值副瓣电平达到-15.6分贝,而256个单元的天线阵的峰值副瓣电平则达到-17.4分贝。
The use of phase units with random phase inversion in phased array antennas to generate efficient cone amplitude distributions to reduce side lobes has been described in the first part of this paper. It changes the first digit of some phase shifter and superimposes it on the phase shift of the control beam. If a phase-weighted method is extended using only two phase shifters, it is possible to control the beam and apply an effective taper amplitude distribution. This approach reduces both the first sidelobe (through taper) and the parasitic sidelobe caused by the use of only two phase shifters to control the beam. As the variance of the random process increases, the peak sidelobe level does not reach the side-lobe level that resembles a phase-weighted one. For a 128-element antenna array, the peak sidelobe level reaches -15.6 dB while the peak sidelobe level for a 256-element antenna array reaches -17.4 dB.