【摘要】 <正> 在地球物理学领域内经常遇到各种观测资料,其信号频率范围属于甚低频和超低频。例如地磁脉动,由电离层反射的无线电波频率的多普勒偏移,哨声,声重力波以及一般的地磁、地电、地震资料,大气参量的变化及其湍动等等,它们的频率范围从千分之几赫兹到数千赫兹。这些资料的收集和整理通常是分开的,由于记录的资料通常并不是数据化的,更多还原

【Abstract】 A system consisting of a microcomputer (IBM-PC), a sound spectrometer (Sonagram) and A/D, D/A converters connected together with proper interfaces for the purpose of geophysical data processing was designed. It is particularly suitable for the frequency range from DC to 10 kHz. Software includes data digitizing and storing, FFT, waveform display etc. which, in most cases, can be used in real time monitoring of certain geophysical phenomena. The analysis of whistlers, geomagnetic pulsations and HF Doppler shifts of ionospherically reflected radio waves are given as examples of its applications.更多还原