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第138章 踏平赤日和(七)(2 / 2)

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两人趴在背囊上双脚打水,废了很大的力气终于游到岸边,二人快速用手搓遍全身,穿上衣服、鞋子,一路潜行向前方靠去。

陈严趴在建筑物阴影了举着夜视望远镜观察,一扇巨大的镜子出现在他面前,它的学名叫做“移相器”,也可以理解为相控阵雷达的天线。

陈严惊喜的对沈逸飞说:“记录坐标,发现‘敌’有源相控阵雷达阵地!”

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沈逸飞抽出“北斗”手台,却满脸苦相,说:“没有北斗,坐标不精确。”

陈严咬牙抽出地图和纸笔,说:“我来计算!”

军事上的坐标是狭义的,仅指经纬度坐标,而不同于数学上的广义坐标。经纬度是经度与纬度组成的坐标系统,是一种利用三度空间的球面来定义地球上的空间的球面坐标系统,能够标示地球上的任何一个位置。计算的小数点后的数字越小,坐标越精确!

纬线和经线一样是人类为度量方便而假设出来的辅助线,定义为地球表面某点随地球自转所形成的轨迹。任何一根纬线都是圆形而且两两平行。纬线的长度是赤道的周长乘以纬线的纬度的余弦,所以赤道最长,离赤道越远的纬线,周长越短,到了两极就缩为0。从赤道向北和向南,各分90°,称为北纬和南纬,分别用“n”和“s”表示。经度分东西,指南北,纬度分南北,指东西。

但是赤道上的一度大约111公里,位于北纬40度附近的一度东西长也差不多有50公里了,地图上只精确到小数点后一位,想要让有限的火箭炮弹发挥出最大的威力,就应该让经纬度坐标无限精确!

这章没有结束,请点击下一页继续阅读!陈严拿着角尺和圆规细心地测量,在敌人纵深里就像在课堂上演算数学题,沈逸飞心虚的警戒着四周,说:“你能不能快点,我已经发现好几拨巡逻队员了!再说,你回去再演算不行吗?”

陈严不满于沈逸飞打断他的思考,说:“要精确到点,我要依靠附近的地形演算!”

在沈逸飞急得抓耳挠腮之际,陈严终于演算完成,他信心十足的报出坐标:北纬n42°15′23.50″、东经e118°52′58.14。

沈逸飞记录到笔记本上,问道:“误差多少?”

陈严得意的摇头晃脑:“不超过十米!”

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“真有你的,撤退!”

为了补充热量,二人把战友补给过来的巧克力全部吃掉,重新整理装备,再次下水。

一阵微风掠过水面,吹的二人头皮发麻,一只鱼受到惊扰高高的跃出水面,发出“啪叽”一声,好巧不巧,岸边一支巡逻队走过听到声响,惨亮的一道手电筒光束扫向二人。

沈逸飞低呼:“隐蔽!”

陈严急的大吸一口空气,和沈逸飞一起将头顶没进水里。

过了接近一分钟,沈逸飞小心的将头露出水面观察,巡逻队走远了,他放下心来拍拍战友的肩膀:“陈严,陈严!”

连续呼唤几声陈严却没有应答,他费力一把将陈严扯出水面,只见陈严嘴唇发紫,紧闭着双眼一动不动。

沈逸飞赶忙拍打陈严的脸颊,却毫无反应,吓得他低声急呼:“醒醒,陈严,别睡觉!”

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