A pulse compression predistortion function for efficient sidelobe reduction in a high-power radar
A pulse compression predistortion function for efficient sidelobe reduction in a high-power radar
复制标题
用于有效减少高功率雷达旁瓣的脉冲压缩预失真功能
DOI：
10.1109/proc.1964.2927
复制
发表时间：
1964
期刊：
影响因子：
--
通讯作者：
J. Paolillo
中科院分区：
文献类型：
--
作者：
C. Cook;J. Paolillo
脉冲压缩技术的成功应用在很大程度上取决于压缩脉冲波形的距离旁瓣的减小。结果表明，在以前公布的数据中的旁瓣电平的计算是不准确的低旁瓣时，要求，因为频谱幅度涟漪的影响，有助于距离旁瓣被忽略或没有说明。本文介绍了最近的信息在这个问题上，介绍了一个模型的菲涅尔频谱，允许更准确的计算压缩脉冲旁瓣结构。额外的频谱相关的成对回波的距离旁瓣预测的模型的结果，并在实践中观察到，具有峰值高达15分贝以上的基础上得出的理想化的频谱假设在早期的研究。实验结果表明，消除频谱振幅涟漪的结果在去除这些成对的回波旁瓣，从而允许更有效地利用信号能量时，需要低旁瓣电平。本文提出了一种预失真线性调频脉冲压缩信号，作为对频谱函数施加控制的一种可实现手段。这种新的脉冲压缩技术不需要在发射机处进行脉冲包络或上升时间整形，因此可应用于高功率系统。实验波形示出了与修改的线性FM信号的频谱相关的成对回波旁瓣的减少，并且还示出了剩余的距离旁瓣不作为多普勒频移的函数而明显增加。
The successful application of pulse compression techniques depends largely on reduction of the range sidelobes associated with the compressed pulse waveform. It is shown that the calculation of sidelobe levels in previously published data is not exact when low sidelobes are called for, since the effects of spectrum amplitude ripple in contributing to the range sidelobes have either been ignored or not stated. This paper presents more recent information on this subject, introducing a model of the Fresnel spectrum that permits a more accurate calculation of the compressed pulse sidelobe structure. Additional spectrum-associated paired-echo range sidelobes are predicted as a result of the model, and are observed in practice, having peak values up to 15 db larger than those derived on the basis of the idealized spectrum assumed in earlier studies. It is shown experimentally that elimination of the spectrum amplitude ripple results in removal of these paired-echo sidelobes, thus allowing more efficient use of the signal energy when low side-lobe levels are required. A predistorted linear FM pulse compression signal is presented as a realizable means for exerting control over the spectrum function. This new pulse compression technique does not require pulse envelope or rise-time shaping at the transmitter, and thus has application to high-power systems. Experimental waveforms illustrate the reduction of the spectrum-associated paired-echo sidelobes with the modified linear FM signal, and also show that the remaining range sidelobes do not appreciably increase as a function of Doppler shift.