Zhurong Lander/Rover, Surface Operations at Utopia Planitia |
Zhurong Lander/Rover, Surface Operations at Utopia Planitia |
May 14 2021, 05:05 AM
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Per this source, landing currently scheduled for 14 May/2300 UTC. Please post any relevant information and updates here.
GO ZHURONG!!!!! -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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May 18 2021, 12:32 PM
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#2
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Member Group: Members Posts: 185 Joined: 4-January 19 Member No.: 8523 |
The first communication from Zhurong was only 2 bytes per second, direct to earth. Now It will use UHF communication and X-band passing through the relay, going to a 2.5 and 6.25 MB of data per day. Thats my understanding from this link on Weibo. So it would be impossible to get an image at the first days. But if they success on using the relay options we will got something soon.
If the information proceeds they have already downloaded less then 200 kB in 3 mars days... Thats why no image... So,.. Zhurong has not yet used Tianwen-1.... I used google translator, so if anyone can get a better info from the pics or the text. "最近很多人问为什么祝融号到现在依然没有图片回传?着陆两三天了都还没回传是不是有问题balabala,诶,这可别着急,下面就分析一下为什么直到现在都没有照片的原因,如图所示(资料来源@航天爱好者网 ),落火当天使用的是自主的直接对地通讯方式,这个对地通讯模式的传输速率仅仅为16bps,也就是一秒传输2个字节,在这种带宽下,仅仅只能判断探测器状态,极其难以实现图片回传,如果一张100KB的低清图片没有经过压缩的话,使用这个小水管回传需要大概14小时左右,这还是不考虑祝融号本身测控的所占用的带宽,但是,在三个火星日之后,也就是今天晚上呢,火星车会和在轨道上面的天问一号第一次尝试建立UHF通讯链路,每次持续8-10分钟,建立以后每天能够回传20Mbit(2.5MB)的数据,再之后每3天会建立一次X波段的通讯链路,这种通讯链路的每次通讯的数据就达到了50Mbit(6.25MB)的数据,所以,如果一切都顺利的话,今天晚上可能拿到祝融号的第一批大小约为2.5MB的数据,就让我们敬请期待这2.5MB小小的数据包里面有没有着陆后的照片吧。如果没有也不要灰心,再等几天,数据会陆续的传回来,相信早晚会看到我国第一张从火星表面发来的照片的! @北斗_玉衡 @大英良心汉弗莱 @脱欧入亚卡菊轮" https://m.weibo.cn/detail/4637909523366148#comment -------------------- "The Earth is a very small stage in a vast cosmic arena"
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May 18 2021, 07:47 PM
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#3
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
I used google translator, Reading between the translation... So far only 16bps on X Band DTE They're expecting to return 20 Megabits through UHF daily starting on Sol 3 with a single 8-10 minute UHF Pass. The 50 megabits per sol through DTE X-Band seems a little big.....if they can handle 10kbps DTE it's probably doable. Doing it every 3 days seems reasonable as well. |
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