Implementation of automatic I/Q imbalance correction for FMCW radar system

2017 2nd International conferences on Information Technology, Information Systems and Electrical Engineering (ICITISEE) Pub Date : 2017-11-01 DOI:10.1109/ICITISEE.2017.8285474

D. Kurniawan, C. Wael, Tajul Miftahushudur, O. Heriana

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引用次数: 5

Abstract

Direct-conversion is one of the receiver architecture units that converts of RF signal to IF signal into in-phase and quadrature (I/Q) form. One advantage of direct conversion is a simple architecture and cheaper than other receiver architecture. This architecture was implemented on FMCW radar for a navigation system which developed by P2ET-LIPI since 2016. One problem of direct conversion is I/Q imbalance. I/Q imbalance occurs when I/Q signal have different amplitude and phase. I/Q imbalance will produce image/mirror signal after FFT processing and it will be detected as a target of radar. The trigonometric function has been implemented to reducing I/Q imbalance by correcting amplitude and phase. This algorithm developed using Visual C# 2015 Community Edition. The algorithm consists of dc removal function, amplitude correction, and phase correction. The experiment shows that the algorithm has good performance at higher SNR to correcting I/Q imbalance.

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FMCW雷达系统I/Q不平衡自动校正的实现

直接转换是将射频信号转换为中频信号为同相和正交(I/Q)形式的接收机结构单元之一。直接转换的一个优点是结构简单，比其他接收器结构便宜。该架构在P2ET-LIPI自2016年以来开发的导航系统的FMCW雷达上实现。直接转换的一个问题是I/Q不平衡。当I/Q信号具有不同的幅度和相位时，就会出现I/Q不平衡。I/Q失衡会在FFT处理后产生像/镜像信号，作为雷达的目标被检测到。三角函数通过修正振幅和相位来减少I/Q不平衡。本算法使用Visual c# 2015社区版开发。该算法包括直流去除函数、幅度校正和相位校正。实验表明，该算法在较高信噪比下具有良好的校正I/Q不平衡的性能。

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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2017 2nd International conferences on Information Technology, Information Systems and Electrical Engineering (ICITISEE)

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