Abstract The design and development of a processing unit for the microwave interferometer is proposed here. The Microwave interferometer is well known for its use in several applications, and one of them is to measure the electron density of fusion plasma. An indigenous effort has been made to build a phase detection system that can be used to calculate fusion plasma electron density for millimeter-wave interferometer. It consists of oven-controlled crystal oscillator (OCXO), frequency synthesizer, IQ mixer, analog to digital converter (ADC), field-programmable gate array (FPGA) for processing the task and other proximity electronics. The phase-detection algorithm is derived using MATLAB. Testing and hardware realization is achieved by implementing it on an FPGA-based system. All the relevant system development requirements are attained with more than 95 percent accuracy. The device will be used in ADITYA tokamak for calculating electron plasma density.

中文翻译：

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基于毫米波干涉仪数字信号处理的聚变等离子体诊断相位检测系统

摘要 本文提出了微波干涉仪处理单元的设计与开发。微波干涉仪以其在多种应用中的使用而闻名，其中之一是测量聚变等离子体的电子密度。已经进行了一项本土努力来建立一个相位检测系统，该系统可用于计算毫米波干涉仪的聚变等离子体电子密度。它由恒温晶体振荡器 (OCXO)、频率合成器、IQ 混频器、模数转换器 (ADC)、用于处理任务的现场可编程门阵列 (FPGA) 和其他邻近电子设备组成。相位检测算法是使用 MATLAB 推导出来的。测试和硬件实现是通过在基于 FPGA 的系统上实现的。所有相关的系统开发要求都以超过 95% 的准确率实现。该设备将用于 ADITYA 托卡马克计算电子等离子体密度。