Reducing the grating lobes and main lobe width for increasing range resolution using phase and frequency modulated codes

2016 International Conference on Electrical, Electronics, and Optimization Techniques (ICEEOT) Pub Date : 2016-03-03 DOI:10.1109/ICEEOT.2016.7754923

K. R. Kumar, P. R. Kumar

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引用次数: 5

Abstract

In Radar the good range resolution can be achieved by a short pulse. Short pulse systems are limited resolution because they are narrow band. Using pulse compression technique high range resolution can be achieved in radar system. The barker codes are known as bi-phase codes with minimum side lobes used in phase modulation in pulse compression technique. LFM and NLFM codes are used as frequency modulation. In this paper the wide band signals that is LFM and NLFM codes are modulates Barker codes to get good resolution while getting minimum side lobes and reduction in main lobe width. By introducing LFM in Barker codes grating lobes will be appeared in Autocorrelation function of LFM Barker sequence. To reduce the grating lobes and the main lobe width to get high delay and Doppler resolution, NLFM code is introduced in Barker codes and observed merit factor, side lobe levels, main lobe width and Doppler tolerance from Autocorrelation function as well as ambiguity function.

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减小光栅瓣和主瓣宽度，利用相位和频率调制码提高距离分辨率

在雷达中，用短脉冲就可以获得较好的距离分辨率。短脉冲系统由于频带较窄，分辨率有限。在雷达系统中，采用脉冲压缩技术可以实现高距离分辨率。巴克码是脉冲压缩技术中用于相位调制的具有最小边瓣的双相码。使用LFM和NLFM码作为调频。本文对宽带信号即LFM码和NLFM码进行巴克码调制，在得到最小边瓣和减小主瓣宽度的同时获得良好的分辨率。通过在巴克码中引入线性调频，将光栅瓣出现在线性调频巴克序列的自相关函数中。为了减少光栅瓣和主瓣宽度以获得高延迟和多普勒分辨率，在巴克码中引入NLFM编码，并从自相关函数和模糊函数中观察到优点因子、副瓣电平、主瓣宽度和多普勒容差。

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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2016 International Conference on Electrical, Electronics, and Optimization Techniques (ICEEOT)

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