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1.引言作者关于长波天波场强和中波近距离天波场强预测的两文~([1、2])发表后,国内、外不少读者提出了一些问题,希望了解文中提供的近距离天波场强数据的测量方法。本文试图回答这些问题。工作于150～1600 kHz频段的长、中波发射机,其天波在200～300 km处为最强。但在300 km以内的近距离,天波场强的直接测量是很困难的,主要原因是存在较强的地波。自
1. INTRODUCTION After the publication of Liang Wen ~ ([1,2]) predicting the strength of longwave and longwave fields and the prediction of midwave shortwave field intensity, many readers at home and abroad have raised some questions and hope to find out the short-range Measurement method of sky wave field strength data. This article attempts to answer these questions. Long and medium-wave transmitters operating in the 150-1600 kHz frequency band have the strongest sky-waves at 200-300 km. However, in the short distance of 300 km, the direct measurement of the sky-wave field intensity is very difficult, mainly because there is a strong ground wave. from