【摘要】 结合近地表频率域电磁探测发射系统特点,引入均值电流和电压双环反馈.设计以DSP(Digital Signal Processor,DSP)为平台的数字双环反馈控制系统.构建电路z域反馈补偿模型,使系统稳定运行.实现低频时稳流、高频时稳压,减小了发射天线负载电流幅值的变化范围,降低了对发射天线参数设计的要求,避免天线高频时电流大幅度衰减引起的发射矩不足,以及低频时电流过大导致的发射电流不稳定的问题,同时对电路起保护作用.通过仿真对比引入并联双环反馈后高低频输出电流变化量为开环时输出电流变化量的8.5%.实测结果达到了设计目的,为近地表电磁探测发射系统的改进提供参考.更多还原

【Abstract】 Combined with the feature of near-surface electromagnetic emission signals in the frequency domain,an average current and a voltage feedback control were introduced.A digital dual-loop feedback control system was built based on DSP(Digital Signal Processor).A feedback model was also built in z domain to make the system stable.The steady voltage in low frequency and steady current in high frequency were realized.The amplitude of the load-current range of transmitting antennas was reduced,while the requirements of antenna design were decreased.The problems that the broadband detection transmitter is not enough to cause the antenna current damping in the high frequency and the broadband detection transmitting is not stable to the large current in low frequency were avoided.Further,aprotection of circuit was provided.Through comparing the simulation after the introduction of dual-loop feedback and open-loop,the parallel dual-loop feedback output current variation was 8.5% of that for open-loop with low to high frequency.The measured results achieve the purpose of design and provide references for the improvement of near-surface electromagnetic launch system.更多还原