摘要
为了使阵列式激发极化接收机采集通道一致,需要设计特定的校准信号源,为此设计和实现了以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M atlab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1μV^1 V可调,步进为0.038μV,信噪比大于40 dB,输出频率为1、0.25、0.125、0.062 5 Hz,误差为1.8×10-5Hz。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。
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 1 μV and 1 V with the step of 0.038 μV.The output of frequency is 1,0.25,0.125,0.062 5 Hz,while the error is 1.8×10^-5 Hz.It has been applied in the main electromagnetic probe system.
出处
《物探与化探》
CAS
CSCD
北大核心
2010年第5期600-603,609,共5页
Geophysical and Geochemical Exploration
基金
国家自然科学基金科学仪器专项(40727002)
