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1980年11月18-21日,法国国家空间研究中心同法国国家地理研究所一起,在法国嘎纳联合召开了一次国际空间大地测量专题讨论会,与会者是来自二十七个国家的一百四十二名专家。1967年曾召开过第一次国际大地测量代表会议,这是第二次代表会议。法国图卢兹空间测地研究小组组长拉法夫在向座谈会汇报工作时强调指出,十五年来空间测地取得了卓越成就。目前,不管在世界任何地方,空间测地的精度绝对值为一米,而相对值是30厘米。此外,还能测定地球自转速度,精度为20厘米/秒,时间精度上是一毫秒,
From November 18-21, 1980, the National Center for Space Studies of France, together with the French National Geographic Institute, jointly convened an international symposium on space geodesy in Cannes, France, with 100 participants from 27 countries Forty-two experts. The first meeting of the International Geodetic Survey was held in 1967, which is the second representative conference. In a briefing on the symposium, Raffoff, leader of the French Toulouse Spatial Geodesy Research Group, underlined the remarkable achievements made in space geodesy over the past 15 years. At present, the accuracy of space geodesy is one meter in absolute terms and the relative value is 30 centimeters, regardless of wherever it is in the world. In addition, it can measure the Earth’s rotation speed, the accuracy of 20 cm / s, time accuracy is one millisecond,