光学精密工程2012，Vol.20Issue(8)：1862-1869,8.DOI:10.3788/OPE.20122008.1862
分布式电磁接收系统多频标定信号的产生与检测
Generation and detection of multi-frequency calibration signal for distributed electromagnetic receiver
摘要
Abstract
To improve the efficiency and accuracy of calibration in frequency domain for a distributed e-lectromagnetic receiver, a calibration method based on multi-frequency pseudo-random signal was proposed and the generation and detection of the signals were investigated. According to the analytical expression of multi-frequency pseudo-random signals, the amplitude and distribution characteristics of the main frequency were analyzed, and a high-precision bipolar calibration source was produced through a Field Programming Gate Array(FPGA) to achieve the encoding synthesis of pseudo-random signals. Based on the noise suppression principle of correlation detection, an iterative method with multiple times for the amplitude and phase of a noisy multi-frequency calibration output signal was given,then it was validated by a simulation. Finally, the acquisition channels of the distributed dual-channel electromagnetic receiving system and a magnetic field sensor were calibrated actually. The results indicate that the amplitude error and the phase error are less than 2% and 1?respectively, while the outside noise is not greater than the calibration output signal. The calibration method is fast, accurate and can be used in the frequency-domain calibration of distributed electromagnetic receiving systems in various field environments.关键词
电磁探测/多频伪随机信号/频域标定/磁场传感器/相关检测Key words
electromagnetic detection/ multi-frequency pseudo-random signal/ frequency-domain calibration/ magnetic field sensor/ correlation detection分类
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张文秀,林君,周逢道,刘立超..分布式电磁接收系统多频标定信号的产生与检测[J].光学精密工程,2012,20(8):1862-1869,8.基金项目
国家自然科学基金科学仪器专项资助项目(No.40727002) （No.40727002）
教育部产学研用合作创新项目(No.OSR-02-01) （No.OSR-02-01）
