WDD-2伪随机多频电法接收机

WDD-2 pseudo-random multi-frequency receiver for electrical exploration

伪随机多频信号带宽可控 ,其能量集中在数个在对数坐标上呈等间距分布的频率上 ,是电法勘探的理想场源。为了实现电法勘探中伪随机多频信号的高精度采集和处理 ,研制了WDD - 2型伪随机多频电法接收机。该接收机采用了低功耗PENTIUM - 16 6PC - 10 4工控机、2 4位CS5 32 1/ 5 32 2A/D转换器、大规模现场可编程门阵列、WINDOWS环境下的数据采集与处理软件、自适应相关同步、互功率谱提取微弱信号、数字滤波等一系列新器件、新技术。上述措施使接收机具有信号处理速度快、动态范围大、质量轻、使用方便、抗干扰能力强、能接收伪随机多频信号和方波信号等优点。可以开展电阻率法、激电法 (时间域或频率域 )、复电阻率法。

The bandwidth of pseudo random multi frequency (PRMF) signal is controllable. Its energy concentrates on several frequencies,which are equally spaced on logarithmic coordinate. It is an ideal excitation source for electrical exploration. To ensure high precision acquisition and processing of PRMF signal in electrical exploration,WDD-2 pseudo random multi frequency receiver for electrical exploration is developed. A series of new electronic elements and technology are applied in above receiver,such as Pentium-166 PC-104 computer with low power consumption,24 bits CS5321/5322 A/D converter,large scale FPGA,data acquisition and processing software in WINDOWS environment,adaptive correlation synchronization,signal to noise enhancement using cross power spectrum and digital filtering,digital polarization compensation. Above measures make the receiver share the advantages of fast signal processing,big dynamic range,portable,super de noise ability,high work efficiency,and ability to receive both rectangular wave and pseudo random multi frequency wave. It can acquire high quality data for many electrical methods,such as resistivity,IP(time domain or frequency domain),complex resistivity,CSAMT,and so on.