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标题: 【救机】水面极限拯救小青蛙，分析掉高原因供参考 [打印本页]

作者: T-3486784401 时间: 昨天 03:14
标题: 【救机】水面极限拯救小青蛙，分析掉高原因供参考
[{"type":1,"key":"first-text","desc":"夏清强调千百遍，头铁继续飞水面。\n\n这种作死的飞行方式险些让小青蛙葬身衢江。正巧飞行资料完整，拷过来一并分析下，供大家参考。\n\n这是极限拯救瞬间，S档地板油遇到疯狂掉高，注意屏幕下方并没有高度警告，危险来的静悄悄："},{"type":1,"key":"j2wjgf8l","desc":""},{"type":2,"multi_size":{"small":"https://bbs.djicdn.com/data/attachment/forum/202409/25/647492b7NrpxwUXYcxWg.png@!550","large":"https://bbs.djicdn.com/data/attachment/forum/202409/25/647492b7NrpxwUXYcxWg.png@!1920","extra_large":"https://bbs.djicdn.com/data/attachment/forum/202409/25/647492b7NrpxwUXYcxWg.png@!2560","medium":"https://bbs.djicdn.com/data/attachment/forum/202409/25/647492b7NrpxwUXYcxWg.png@!1200"},"percent":1,"key":"cpu6tu8m","url":"https://bbs.djicdn.com/data/attachment/forum/202409/25/647492b7NrpxwUXYcxWg.png"},{"type":1,"key":"nxtbrwqq","desc":""},{"type":1,"key":"zfm3mk06","desc":"作为对照，半秒后拉起悬停，参考岸边至少上升 2m，高度显示距水面 3.3m，相当于最低不足 1m："},{"type":1,"key":"skgse7ev","desc":""},{"type":2,"multi_size":{"small":"https://bbs.djicdn.com/data/attachment/forum/202409/25/75790JTfsZhGBjiiSRze.png@!550","large":"https://bbs.djicdn.com/data/attachment/forum/202409/25/75790JTfsZhGBjiiSRze.png@!1920","extra_large":"https://bbs.djicdn.com/data/attachment/forum/202409/25/75790JTfsZhGBjiiSRze.png@!2560","medium":"https://bbs.djicdn.com/data/attachment/forum/202409/25/75790JTfsZhGBjiiSRze.png@!1200"},"percent":1,"key":"z59fwre8","url":"https://bbs.djicdn.com/data/attachment/forum/202409/25/75790JTfsZhGBjiiSRze.png"},{"type":1,"key":"b44xw09m","desc":""},{"type":1,"key":"2cx92zxs","desc":"疯狂掉高发生在穿出桥洞瞬间，从约 3m 的高度直接掉到不足 1m，猛推左杆才得救："},{"type":1,"key":"tmejcuuf","desc":""},{"type":2,"multi_size":{"small":"https://bbs.djicdn.com/data/attachment/forum/202409/25/5281jJB6jEaYUL21hlpY.png@!550","large":"https://bbs.djicdn.com/data/attachment/forum/202409/25/5281jJB6jEaYUL21hlpY.png@!1920","extra_large":"https://bbs.djicdn.com/data/attachment/forum/202409/25/5281jJB6jEaYUL21hlpY.png@!2560","medium":"https://bbs.djicdn.com/data/attachment/forum/202409/25/5281jJB6jEaYUL21hlpY.png@!1200"},"percent":1,"key":"es3tv0ns","url":"https://bbs.djicdn.com/data/attachment/forum/202409/25/5281jJB6jEaYUL21hlpY.png"},{"type":1,"key":"8ltjcfmo","desc":""},{"type":1,"key":"zghxpmhj","desc":"事后查看录屏+飞行记录，的确不能怪 dji 和小青蛙。放下全程录屏感受下："},{"type":1,"key":"j71if0a9","desc":""},{"type":4,"imgsrc":"https://bbs.djicdn.com/data/attachment/forum/202409/25/8219OUCFXKHjam8MRI8V.jpg","percent":1,"key":"sddhpelz","url":"22a093e1-d004-4f24-b901-1ff213f0b083"},{"type":1,"key":"ly7vpjzf","desc":"首先是过大的倾角配合水面，下视+红外应该都落在失效区域，这也解释为何掉高瞬间没有水面高度警告："},{"type":1,"key":"htwm35wd","desc":""},{"type":2,"multi_size":{"small":"https://bbs.djicdn.com/data/attachment/forum/202409/25/5900RsncdqWRyEKpX1vv.png@!550","large":"https://bbs.djicdn.com/data/attachment/forum/202409/25/5900RsncdqWRyEKpX1vv.png@!1920","extra_large":"https://bbs.djicdn.com/data/attachment/forum/202409/25/5900RsncdqWRyEKpX1vv.png@!2560","medium":"https://bbs.djicdn.com/data/attachment/forum/202409/25/5900RsncdqWRyEKpX1vv.png@!1200"},"percent":1,"key":"xopeei99","url":"https://bbs.djicdn.com/data/attachment/forum/202409/25/5900RsncdqWRyEKpX1vv.png"},{"type":1,"key":"9gjva6fk","desc":"再就是温度场对于气压定高的影响：飞机快速穿越冷热剧烈变化的界面时，气压传感器可能因为温度补偿滞后，而出现短暂错误读数。\n\n飞机掉高过程中，高度计读数几乎没变化，大致就印证了这么个猜想（飞机用错误的高度，把气压计的错误补偿掉了）："},{"type":1,"key":"oxnx4cgc","desc":""},{"type":2,"multi_size":{"small":"https://bbs.djicdn.com/data/attachment/forum/202409/25/38554xUIq7LA2nqYzN5Q.png@!550","large":"https://bbs.djicdn.com/data/attachment/forum/202409/25/38554xUIq7LA2nqYzN5Q.png@!1920","extra_large":"https://bbs.djicdn.com/data/attachment/forum/202409/25/38554xUIq7LA2nqYzN5Q.png@!2560","medium":"https://bbs.djicdn.com/data/attachment/forum/202409/25/38554xUIq7LA2nqYzN5Q.png@!1200"},"percent":1,"key":"vs33n9yf","url":"https://bbs.djicdn.com/data/attachment/forum/202409/25/38554xUIq7LA2nqYzN5Q.png"},{"type":1,"key":"gnvyjlhg","desc":"掉高过程发生在飞出桥洞瞬间，基本上和阳光覆盖的温热区域吻合。\n\n在最新的 neo 上，看到了与小青蛙 mini3p 一样的下视红外探测。基本上可以推测 neo 遇到本文场景必炸："},{"type":1,"key":"nmlwmvc2","desc":"红外定高大角度失效，气压定高遇到温度场短时失效，GPS 高度基本不准，再没个遥控...."},{"type":1,"key":"n5n4sqci","desc":"最后放上小青蛙视角拍到的救机瞬间，1/125s 快门，近处速度模糊已经很夸张，好在推杆救回："},{"type":1,"key":"cus1qh39","desc":""},{"type":2,"multi_size":{"small":"https://bbs.djicdn.com/data/attachment/forum/202409/25/81767encN4UFuRGBa0wA.PNG@!550","large":"https://bbs.djicdn.com/data/attachment/forum/202409/25/81767encN4UFuRGBa0wA.PNG@!1920","extra_large":"https://bbs.djicdn.com/data/attachment/forum/202409/25/81767encN4UFuRGBa0wA.PNG@!2560","medium":"https://bbs.djicdn.com/data/attachment/forum/202409/25/81767encN4UFuRGBa0wA.PNG@!1200"},"percent":1,"key":"oo83yrib","url":"https://bbs.djicdn.com/data/attachment/forum/202409/25/81767encN4UFuRGBa0wA.PNG"},{"type":1,"key":"097lpu4v","desc":"-------------------------------------------------------------------------------------\n\n以上，小青蛙飞水面遇到突发掉高，极限推杆成功救回，并分析了各方面原因供参考。\n\n实际应避免低飞掠水，最差也应评估温度、气流对气压定高的潜在影响，紧盯图传随时准备救机。\n\n最后祝大家畅飞不炸！\n"}]

作者: djiuser_89VUbf 时间: 昨天 16:58

作者: djiuser_h0ZgeR 时间: 昨天 17:18

作者: djiuser_40a3G4 时间: 昨天 18:35
详细

作者: djiuser_UnkPA9 时间: 昨天 19:02

作者: 玛卡巴卡的皮卡 时间: 昨天 19:24
精彩！

作者: djiuser_oCCrdu 时间: 昨天 19:29

作者: djiuser_zcmp6F 时间: 昨天 19:37
<img type="comment-image" src="https://bbs.djicdn.com/data/attachment/forum/202409/26/3933CjCHJFl2QJZNbQ1n.jpg" />

作者: 振翅高飞 时间: 昨天 20:06
好险~

作者: djiuser_iFIFP9 时间: 昨天 20:17

作者: 不会飞M档的FPV遥控器3 时间: 昨天 20:27

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作者: DJ·H 时间: 昨天 21:20
还是作者牛啊

作者: DJ·H 时间: 昨天 21:21
我个人认为跟gps弱脱不开关系，我在广阔海面上低飞都没事

作者: DJ·H 时间: 昨天 21:24
再稍微晚一秒，作者就能换mini4pro了（bushi

作者: T-3486784401 时间: 昨天 21:25
肯定啊，GPS 高度也是个参考。

不过越是广阔海面，反倒是气压更稳定了，不会因为冷热不均而忽高忽低。

作者: T-3486784401 时间: 昨天 21:25
下降速度估计超过 1m/s，真就是最后一秒救回

作者: T-3486784401 时间: 昨天 21:25
要啥避障，我都是开 S 档的

作者: T-3486784401 时间: 昨天 21:26
好在大堤有明显的参照，肉眼可见的掉高

作者: 不良人 时间: 昨天 21:27
真不错

作者: DJ·H 时间: 昨天 21:28
左下角的高度基本没有变化，飞控还是一脸懵，，这时候手搓的飞控可能都比这好用，因为手搓的飞控没有考虑那么多

作者: Z_cloudys 时间: 昨天 21:43

作者: T-3486784401 时间: 昨天 21:46
看过一系列飞火盆的视频，飞机直挺挺往火力掉。
我比较倾向于气压受干扰：只要一个错误的补偿，飞机以为自己飞太高了，妥妥的下压高度。

冬天每次从室内出发（有暖气），飞机出门就猛的一拉高，目测也是气压补偿滞后

作者: djiuser_2TZBmg 时间: 昨天 22:08
愿大疆所有产品使用者永远机器不坏

作者: Titanium 时间: 昨天 22:52
学习了

作者: djiuser_lgx5iI 时间: 昨天 23:07

作者: djiuser_lgx5iI 时间: 昨天 23:08

作者: 红箭--射手 时间: 4 小时前
哈哈没有分析的那么复杂吧，还是指令控制造成的，之前已经有两个多余的控制指令了！

作者: djiuser_Ya4Yet 时间: 4 小时前
我的neo已经炸了，就你分析这原因。当时用手机wifi连接让它做自动渐远飞行，遇下方水面直接乱了，先突然横飞接着掉高一头进水里了。可怜还没保险

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