中文摘要：

半航空瞬变电磁信号源是调试与验证半航空瞬变电磁接收机的信号灵敏度、频率响应和噪声水平等关键性能指标的重要设备.无人机电磁干扰和线圈运动噪声是半航空瞬变电磁接收系统相对于地面瞬变电磁接收系统＂特有＂的噪声,目前通用信号源无法满足半航空瞬变电磁接收机室内调试和标定的需求.首先通过分析半航空瞬变电磁信号模型和无人机电磁干扰及线圈运动噪声模型,建立了输出信号及噪声的产生方法,再基于现场可编程门阵列（FPGA）,运用DDS技术和SOPC技术,调用Nios II软核设计了信号产生模块,能够产生瞬变电磁信号并叠加无人机电磁干扰和线圈运动噪声,并在此基础上结合PC机和D/A电路研制了半航空瞬变电磁接收机专用测试装置.测试结果表明：测试装置的信号分辨能力达到100μV,同步触发信号与信号输出时延小于2μs,满足仪器测试与标定需求.

英文摘要：

Thesemi-airborne transient electromagnetic signal source is an important equipment for the semi-airborne transient electromagnetic receiver to debug and calibrateits key performance indicators such as signal sensitivity,frequency response and noise level. Compared with the ground transient electromagnetic receiving system,the electromagnetic interference of unmanned aerial vehicle and coil motion noise are the ＂ special＂ noise of the semi-airborne transient electromagnetic receiving system. At present,the general signal source cannot meet the requirements of debugging and calibration of the semi-airborne transient electromagnetic receiver indoor. First of all,the method of generating the output signal and noise is established by analyzing the model of semi-airborne transient electromagnetic signal and the electromagnetic interference of unmanned aerial vehicle and the noise model of coil motion.Based on field programmable gate array（ FPGA）,DDS technology and SOPC technology and Nios Ⅱ soft core are used to design the signal generation module,which can generate transient electromagnetic signals and superimpose electromagnetic interference of unmanned aerial vehicle and coil motion noise. On the basis of above analysis,the test device of the semi-airborne transient electromagnetic receiver is developed by using PC and D/A circuit. According to test results,the resolution of this test equipment is 100 μV and the delay between synchronization trigger signal and the signal output is less than 2 μs,which satisfy the requirements of test and calibration.