Design of High Intensity Electromagnetic Radiation Measurement System in Explosive Field
Aiming at the characteristics of the explosive electromagnetic radiation signal of high-energy warhead,such as wide frequency band,large change amplitude,long duration and complex measurement conditions,a measurement system of explosive electromagnetic radiation based on mixing antenna is designed.Four kinds of measuring antennas are designed:short-wave antenna(1.5～30 MHz),ultra-wideband antenna(30～1 000 MHz),microstrip antenna(5.9～6.0 GHz,8.4～8.5 GHz).By optimizing the antenna structure and adding matching circuits,the measurement efficiency is improved,which can cover all electromagnetic sensitive frequency bands of ordnance equipment.The signal conditioner with many functions is designed by adopting a modular approach,which includes combiner,amplifier,limiter and filter.The amplifier module adopts the structure of"fixed gain amplifier&step attenuator",which not only realizes the adjustment of 0～30 dB in the full frequency band,but also improves the accuracy of the adjustment system to 0.5 dB.The limiter module limits the sampling signal power to less than 65%of the maximum withstand power of the data acquisition instrument,which improves the adaptability of the measurement system to the electromagnetic signal of explosion field strength.The measurement system can meet all the indexes of high-energy warhead explosion electromagnetic radiation measurement by adopting such technical means as mixed-band antenna combination,high-precision coefficient adjustment,and multi-function signal conditioning.
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