GS-15型重力仪滤波效能与观测稳定性的对比分析

THE COMPARATIVE ANALYSIS OF THE FILTER ABILITY AND OBSERVATIONAL STABILITY OF TYPE GS 15 GRAVIMETER

通过观察和模拟干扰源试验，认为红山地震台ＧＳ－１５ 型重力仪潮汐观测曲线畸变和观测精度低是因原配ＲＣ滤波电路的抗干扰能力差。用自制的有源贝赛尔滤波电路取代原配ＲＣ滤波电路后，观测质量得到了根本的改善。一系列参量的分析表明：ＧＳ型重力仪弹性系统和换能电路性能优良，有源滤波电路具有很强的抗干扰能力；使用数字记录代替模拟记录可以减小记录系统的非线性失真。

Before the transformation of the Type GS 15 Gravimeter at Hongshan Seismostation,their observational accuracy was low and the tide curves distorted.Later,through observing and simulating the interference source experiment,it was found that it was caused by the bad anti interference capability of originally equiped RC filtering circuit.After the RC filtering circuit was changed for self made active Bessel filtering circuit,the observational quality is greatly improved.The analysis of a series of tide parameters shows:at present,the elastic system and transducer of type GS 15 gravimeters are good in performance;the active filtering circuit has high anti interference capability,and the digital record in place of the analogue record reduces the nonlinear distortion of the recording system,thus enhancing the accuracy and stability of tide analysis.