He Zhanxiang

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Random noise and coherent interference are major factors determine the performance of MT instrument. Based on auto and cross power spectrum of channels inside MT instrument, procedure is developed to estimate noise and coherent interference inside MT instrument. At first, short circuited input is applied to all channels of MT instrument. Coherent(More)
The performance of GPS based frequency standard depends on the accuracy and stability of the time interval measurement. Based on the XILINX Spartan-3 FPGA, this paper mainly describes a time interval measurement system which is controlled by the PicoBlaze soft core embedded processor and is suitable for the frequency calibration of GPS based frequency(More)
Magnetotelluric exploration method is a powerful tool in oil and gas exploration, crust and earthquake research. The corresponding instrument system need to record low noise data at sample rate 2400 Hz, 150 Hz and 15 Hz or other triple frequencies simultaneously. Multi-fold notch filter is also need to remove 50/60 Hz power line interference. Commercial(More)
Due to the operation environment in field exploration, low-power consumption and high reliability is a basic requirement for developing control system of electromagnetic acquisition stations. In this paper, we propose the design of the control system based on AT91RM9200 microprocessor and linux-2.6.21 operation system. The hardware design and the OS porting(More)
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