目前,各种型号的电磁频率测深仪正在逐步应用于生产。众所皆知,为保证观测质量,必须提高接收机的抗干扰能力。但是大地上的噪声源一般是无法限制的。大地噪声的种类繁多,强度很大,其幅值常超过有效信号,因此,提高接收机的抗干扰能力受到 At present, various types of electromagnetic frequency sounder are being gradually applied to the production. As we all know, in order to ensure the quality of observation, we must improve the receiver’s anti-interference ability. However, noise sources on the earth are generally not limited. A wide range of ground noise, high intensity, its amplitude often exceeds the effective signal, therefore, to improve the receiver’s anti-interference ability by