第625章 通信卫星的障碍
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第625章通信卫星的障碍(第1/2页)
金乌一号成功入轨的消息传到长安,李佑林没有急着庆祝。
他知道这颗卫星能飞上去是一回事,飞上去之后能做什么是另一回事。
但他还是立马召见了航天研究院的院长前来汇报工作。
院长叫陈望秋,过完年就五十三岁了。
他早年在美国普渡大学读的是无线电工程,回国之前一直在西屋电气当高级工程师。
李佑林拿着报告随意翻了一下,然后说道:“陈院长,你和我实话实说,这个金乌一号,还有那些不足的地方。”
他这不是在泼冷水,这是南华首次,也是世界上第三个国家成功发射了卫星。
按道理,是值的大肆庆祝一番,但这是关起门来说话,李佑林就是想听真话。
陈望秋没想到总统会这么直接的问话,他思索了片刻才回答:
“总统,金乌一号能发射,能入轨,能工作。但这些‘能’跟前些天发射前向您汇报时说的‘能’,中间确实还是差着一些事情。
先说供电的问题。太阳能阵列的功率输出,在设计指标上能满足转发器的最低需求。
但在实际工况中,轨道上的温度变化和姿态偏转会对发电效率产生明显影响。
最稳妥的情况下,每天也只能工作三次,每次不超过5分钟。
而且能工作的那5分钟里,转发器的带宽非常有限。
只能传输莫尔斯码级别的简易电报或短指令。”
李佑林听得很仔细,也没急着接话,只是问了一句:“也就是说,我们现在只能传文字,不能传声音?”
陈望秋停顿了一下,似乎在组织一个不能让总统失去信心的答案。
“总统,传声音不是能不能传的问题,是代价的问题。
一张电报几百个字符,压缩之后也就几百个位阻(字节)的数据。
声音不同,声音是连续的模拟信号,要把它数字化再传出去,数据量比电报大了好几个数量级。
金乌一号的转发器芯片虽然用的是南华最新的集成电路,运算速度足够了,但供电跟不上。
让芯片算得再快,电池没电了它也传不动。
而且地面接收端的解码精度和抗干扰能力,目前都还达不到连续收发的标准。”
“也就是说,我们还做不到像美国那样,能传递音频?”
“按道理,可以传递三到五秒。”陈望秋回答,“但对方收到之后可能听不懂在说什么。”
“总统,美国去年八月发射了回声一号,它是一颗被动反射卫星,不是通信卫星。
它不做收发转发,而是像一面镜子,地面向它发射信号,它把信号反射回地面,完成了一次被动传输。
它的优势是结构简单,不用处理信号,所以耗电小,因此可以长时间在轨运行。
那次传输的是一段艾森豪威尔的预录讲话,不是实时的,只是测试信号在反射路径上的衰减情况。”
李佑林听了,手指在茶杯盖上停了一下:“你的意思是,美国不需要自己供电,金乌一号需要自己供电?”
“是的,总统。主动转发卫星的功耗是被动反射的几十倍。
但如果能解决供电问题,主动转发的信号质量、传输距离、抗干扰能力都比被动反射强得多。”
李佑林听后,才察觉为何当时美国死活不肯给太阳能阵列的技术,原来这是核心中的核心。
发射了卫星,但是电池不够用,早晚都会变成太空垃圾。
南华这颗主动转发卫星需要的功率,比一颗被动反射卫星高出至少一个数量级。
一颗60公斤的卫星,能铺设的电池板面积非常有限,发电功率可能只有几十瓦。
这是什么概念?此时一台普通的无线电发射机需要5-10瓦的功率。
卫星在轨道上,要把信号转发回地面,发射功率至少要5瓦,加上接收信号,放大处理等等,至少要50瓦以上。
所以也就是每次工作最多5分钟,因为其他时间,都要在不断充电才行。
“那持续供电的问题,有解决方案了吗?”李佑林询问道。
(本章未完,请点击下一页继续阅读)第625章通信卫星的障碍(第2/2页)
“目前最现实的方案,是增加太阳能阵列面积,把金乌一号做得更大。
但更大的卫星需要更大的火箭。
瀛洲发射场的火箭,目前只能把60公斤左右的载荷送入预定轨道。
如果要做到100公斤以上,要等下一代的运载火箭研制完成。
总统,我们这个金乌一号这是一个测试,证实集成电路板在轨道上能正常运作这件事。”
“如果我想要一个真正能传播声音,就像电话那样,能不能做到?”
陈望秋看到总统如此执着
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