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Effect of signal to noise ratio degradation due to RF level variation on active antenna performance

机译:射频电平变化导致信噪比下降对有源天线性能的影响

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Active phased array antenna consists of a number of radiating elements excited by active RF modules with transmit and receive chain. The performance of the array depends upon stability and accuracy of amplitude and phase excitation at input of elements during transmit mode or at input of receiver during receive mode of operation. To achieve desired performance of an active array, calibration (correction of amplitude and phase errors) of all RF paths consisting of active modules need to be done. Accuracy of calibration depends upon Signal to Noise Ratio (SNR) at individual RF path. This paper describes the effect of SNR degradation at active path on the array performance, due to variation of RF level of injected reference signal used for calibration of the array. The study has been done on variation in array characteristic such as beam width, side lobe levels etc. due to poor SNR level in active RF path. The measured results of calibration network of a realized active array with about 2000 active elements has been used to derive the SNR of the network and simulation results have been generated. The simulated and measured pattern has been compared and presented.
机译:有源相控阵天线由多个辐射元件组成,这些辐射元件由具有发射和接收链的有源RF模块激发。阵列的性能取决于在操作的发射模式期间或在操作的接收模式期间在接收机的输入处的幅度和相位激励的稳定性和准确性。为了获得有源阵列的期望性能,需要对由有源模块组成的所有RF路径进行校准(幅度和相位误差的校正)。校准的准确性取决于各个RF路径上的信噪比(SNR)。本文描述了由于用于阵列校准的注入参考信号的射频电平的变化,有源路径上的SNR降低对阵列性能的影响。由于有源RF路径中的SNR水平较差,已经对阵列特性的变化进行了研究,例如波束宽度,旁瓣水平等。已实现的有源阵列具有约2000个有源元件的校准网络的测量结果已用于推导网络的SNR,并生成了仿真结果。模拟和测量的模式已被比较和介绍。

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