基于STM32F103RD的数字相干检测系统设计与实现  

Design and realization of digital coherent detection system based on STM32F103RD

作　　者：唐冬梅[1,2] 柳建新[1,2] 杨振 

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083 [2]有色资源与地质灾害探查湖南省重点实验室,湖南长沙410083 [3]湖南继善高科技有限公司,湖南长沙410208

出　　处：《中南大学学报（自然科学版）》2014年第8期2701-2707,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41174103);教育部博士点基金资助项目(20110162130008);"十二五"国家科技支撑计划项目(2011BAB04B08);国家高技术研究发展计划("863"计划)项目(2014AA06A615)

摘　　要：为了提高检测精度、简化硬件电路设计、精确测量2n伪随机复合频率信号中各主频信号通过地质体之后的响应参数(相位信息和幅度信息),基于数字相干检测的原理,设计一种数字相干检测系统。该检测系统硬件以高性能处理器STM32F103RD为核心,结合24位Σ-△型高精度模数转换器ADS1271和GPS的实时授时功能完成对待测信号的采集;该系统软件针对待测信号中与参考信号相干的某个主频信号设计A/D采样率处理、参考信号离散化处理、GPS同步规则设置以及相干检测计算等算法实现幅度和相位的检测。研究结果表明:该相干检测系统能准确检测出2n复合频率信号中各主频信号经过模拟地质体之后的响应信息;该检测系统具有良好的抗温度干扰能力、一致性以及重复性,能有效提高检测精度、减少误差。该相干检测系统非常吻合当前物探领域频率域勘探仪器的检测要求,具有广阔的应用前景。To improve detection accuracy, simplify hardware circuits and accurately measure response parameters on geologic body of main frequencies in 2n composite frequency signals, a digital coherent detection system was designed based on digital coherent detection principle. The hardware adopts high quality processor STM32F103 RD, 24 bit high precision ADC ADS1271 and GPS to realize signal acquisition. The software realizes response parameters detection through A/D sample rate processing algorithm, reference signal discretization processing algorithm, GPS synchronization rules setting algorithm and coherent detection calculation algorithm based on hardware platform. The results show that the digital coherent detection system can accurately detect response information on simulated geologic body of main frequencies in 2n composite frequency signals. It has good consistency, repeatability and high ability to resist temperature interference. And it can efficiently improve detection accuracy and decrease error. So this system can meet detecting requirements of current frequency domain exploration instruments in geophysical field, and it has broad application prospect.

关 键 词：STM32F103RD GPS 主频 2n复合频率信号 数字相干检测 

分 类 号：P319.3[天文地球—固体地球物理学]