An article in the September 2019 issue of the AES Magazine described the background of the IEEE Historic Milestone to mark the invention and first demonstration of the radar by the German inventor Christian H€ulsmeyer [1]. On 17 May 1904, H€ulsmeyer arranged a demonstration of his invention in K€oln (Cologne), Germany, which was reported in the K€olner Tageblatt and K€olnischer Zeitung newspapers the following day. This device was conceived as a means of detecting ship targets, even under conditions of poor visibility, and hence preventing collisions. By the standards of modern radar, it was very crude, using a spark-gap transmitter and a coherer-type receiver. He patented his invention both in Germany and in the U.K. On 19 October 2019, the invention was formally marked as an IEEE Historic Milestone. This article describes the event and the various contributions that came together to make a very special day for IEEE AES and for the worldwide radar community.

中文翻译：

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IEEE 雷达历史里程碑的揭幕和奉献

AES 杂志 2019 年 9 月号的一篇文章描述了 IEEE 历史里程碑的背景，以纪念德国发明家 Christian H€ulsmeyer [1] 发明和首次演示雷达。1904 年 5 月 17 日，H€ulsmeyer 在德国 K€oln（科隆）安排了他的发明展示，第二天 K€olner Tageblatt 和 K€olnischer Zeitung 报纸对此进行了报道。该装置被认为是一种探测船舶目标的手段，即使在能见度差的情况下，也能防止碰撞。按照现代雷达的标准，它非常粗糙，使用火花隙发射器和相干型接收器。他在德国和英国为他的发明申请了专利 2019 年 10 月 19 日，该发明被正式标记为 IEEE 历史里程碑。