导波式雷达物位计测量误差分析与软件修正

doi:10.3969/j.issn.1000-1158.2015.05.13

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摘要分析了导波雷达物位计测量误差产生的原因,提出软件修正方法。在硬件方面分析了发射脉冲宽度和等效时间采样间隔的影响;在软件方面分析了信号处理过程产生的粗大误差、随机误差和系统误差。基于现有的硬件平台,提出一整套处理方法以减小测量误差,包括结合回波特征参数去判断物位回波,9点移动平均滤波预处理,选取最小斜率点作为回波定位点,对计算值进行中位值平均滤波。水位测量实验结果表明,在理论误差为2～4 cm情况下,实际测量误差小于1 cm,这验证了软件修正方法的有效性。

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	刘铮
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	徐科军

关键词 ：计量学, 导波雷达物位计, 测量误差分析, 软件修正

Abstract：The causes of the error of the guided wave radar level gauge (GWRLG) are analyzed, and a software correction method is proposed. The impacts of transmit pulse width and equivalent time sampling interval are studied in hardware. The gross error, the random error and the systematic error generated in the signal processing are researched in software. Based on the existing hardware platform, a set of signal processing method is put forward to reduce the measurement error, i.e., combining feature parameters to recognize the actual level echo, performing 9 point moving average to preprocess the signal, selecting the minimum slope point as the echo positing point, and conducting median average filtering for the calculated values. The experimental results of water level measurement show that the actual measurement error is reduced to within 1 cm when the theoretical error is 2～4 cm, which validates the effectiveness of the proposed software correction method.

Key words： metrology guided wave radar level gauge measurement error analysis software correction

通讯作者: 徐科军为通讯作者。dsplab@hfut.edu.cn

作者简介: 刘铮（1990-）,男,陕西西安人,合肥工业大学硕士研究生,研究方向为嵌入式系统。292231698@qq.com

引用本文:

刘铮,魏萌,徐科军. 导波式雷达物位计测量误差分析与软件修正[J]. 计量学报, 2015, 36(5): 506-512.
LIU Zheng,WEI Meng,XU Ke-Jun. Measurement Error Analysis and Software Correction of Guided Wave Radar Level Gauge. Acta Metrologica Sinica, 2015, 36(5): 506-512.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2015.05.13 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2015/V36/I5/506