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本文介绍数字式电离层测高仪DPS—4的原理和特点、在中山站的安装和调试．从扫频电离图所得到的初步结果表明，中山站冬季电离层F层存在明显的磁中午现象，而电离层Es层与极光粒子沉降有很大关系；漂移测量的结果表明，电离层漂移主要是水平方向的运动，并且具有大体一致的日变化模式，显示出在没区存在逆阳对流．
This article describes the principle and characteristics of digital ionospheric altimeter DPS-4, installation and commissioning in Zhongshan Station. The preliminary results obtained from the frequency sweep ionization maps show that there is a significant magnetic noon phenomenon in winter F ionosphere of Zhongshan Station, and the Es layer of ionosphere is closely related to the auroral particle settlement. The drift measurements show that the ionospheric drift is mainly Is a horizontal motion, and has a generally consistent diurnal variation pattern, showing that there is a back-to-back convection in the absence of a zone.