基于直接数字频率合成技术的类激发极化信号源研制
陈健1,2 ; 林君1,2 ; 张文秀1,2 ;彭丽利1,2
1.吉林大学仪器科学与电气工程学院,长春 130026;2. 吉林大学 地球信息探测仪器教育部重点实验室,长春 130026
INDUCED POLARIZATION-SIMILAR SIGNAL SOURCE BASED ON DDFS
CHEN Jian 1,2 ; LIN Jun 1,2 ; ZHANG Wen-xiu 1,2 ; PENG Lili 1,2
1. College of Instrument Science and Electrical Engineering, Jilin University, Changchun 130026, China ;2. Key Laboratory of Geo-Exploration Instrumentation, Ministry of Education, Jilin University, Changchun 130026, China
摘要 为了使阵列式激发极化接收机采集通道一致,需要设计所需要特定的校准信号源。笔者设计
和实现了以USB2.0为通信协议的类激发极化信号源。系统以直接数字合成技术(DDFS)理论为基础
,采用大规模现场可编程门阵列技术,设计了DDFS内核,结合Matlab产生上述模型响应的数据。该
类激发极化信号源输出电压可以在1uV到1V可调,步进为0.038uV,信噪比大于40dB,输出频率为
1Hz、0.25Hz、0.125Hz、0.0625Hz,误差为1.8 x 10-5 Hz。该类激发极化信号源已经在分布式阵列电
磁接收系统的主站的多通道校准工作得到了应用。
Abstract : In order to realize consistency of acquisition channels of array receivers for Induced
polarization, it’s necessary to design a special calibration source . The induced polarization-similar
source based on US2.0 communications protocol was designed and implemented. This design is based
on the theoretical foundation of DDFS and uses field-programmable gate array to design core of DDFS,
with the generation of model sounding data. The induced polarization-simulated source can be
adjusted between 1uV and 1V with the step of 0.038V. The output of frequency is 1Hz, 0.25Hz,
0.125Hz, 0.0625Hz, while the error is 1.8 × 10-5 Hz. It has been applied in the main electromagnetic
probe system.
出版日期: 2010-10-15
基金资助: 国家自然科学基金科学仪器专项(40727002)
通讯作者:
陈健(1987-),男,吉林大学仪器科学与电气工程学院硕士研究生。
引用本文:
陈健, 林君, 张文秀, 彭丽利. 基于直接数字频率合成技术的类激发极化信号源研制[J]. 物探与化探, 2010, 34(5): 600-603.
CHEN Jian, LIN Jun, ZHANG Wen-Xiu, BANG Li-Li. INDUCED POLARIZATION-SIMILAR SIGNAL SOURCE BASED ON DDFS. Geophysical and Geochemical Exploration, 2010, 34(5): 600-603.
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