Characterisation of Sidelobes for Multibeam Radar based on Quasi-Orthogonal LFM Waveforms

A. Balleri, Leon Kocjančič, T. Merlet
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Abstract

Multibeam radars (MBRs) enable multiple independent channels by simultaneously exploiting spatial and waveform diversity. Orthogonal waveforms are employed to form multiple independent antenna beams, each one providing a different function and using different dedicated radar resources. This paper investigates sidelobe levels in MBRs and presents a comparison with those of an Electronic Steerable Array (ESA) that employs a single waveform in transmission to generate multiple simultaneous beams. Simulations are carried out for a 3-channel MBR transmitting quasi-orthogonal Linear Frequency Modulated (LFM) waveforms at Ku band. The response of the MBR to an ideal point target as a function of aspect angle as well as that to multiple targets in different locations has been investigated. Results corroborate the analytical findings and show that the sidelobe levels with respect to angle, at the target range, are attenuated by the cross-ambiguity function properties between the waveforms employed. The range response to a target in low channel isolation suffers from cross-channel interference that may alter the noise floor characteristics of the radar, hence stressing the importance of suitable waveform selection.
基于拟正交LFM波形的多波束雷达副瓣特性研究
多波束雷达(mbr)通过同时利用空间和波形多样性来实现多个独立信道。采用正交波形形成多个独立的天线波束,每个波束提供不同的功能并使用不同的专用雷达资源。本文研究了mbr的旁瓣电平,并与使用单一波形产生多个同时波束的电子操纵阵列(ESA)的旁瓣电平进行了比较。对三通道MBR在Ku波段发射拟正交线性调频(LFM)波形进行了仿真。研究了MBR对理想点目标的响应随向角的变化规律,以及对不同位置的多个目标的响应规律。结果证实了分析结果,并表明在目标范围内,相对于角度的旁瓣电平由于所采用的波形之间的交叉模糊函数特性而衰减。低通道隔离状态下目标的距离响应受到可能改变雷达本底噪声特性的跨通道干扰的影响,因此强调了选择合适波形的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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