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科学家逆向工程将Starlink作为定位卫星 精度最高可达1米_我的网站

A |     Christmas is finally here, and Bollywood celebrities are celebrating the festive season with warmth, joy, and big smile. They welcomed Christmas in their own special ways, giving fans a peek into their festive celebrations through social media. Whether it was decorating trees, relaxing with loved ones, or sharing cheerful wishes, the stars truly soaked in the holiday spirit.     Kareena Kapoor Khan, who comes from the Pataudi family, shared a charming glimpse of her Christmas décor. She posted a picture of a slate hanging on a beautifully decorated Christmas tree. The slate read, “Christmas at the Pataudi’s”, and featured a cute Santa Claus illustration, perfectly capturing the festive mood.     See here:          Tamannaah Bhatia kept things cosy and fun at home. She was seen decorating her Christmas tree while dressed in a comfortable red pajama set. Adding a playful touch, her post also featured a gingerbread man wearing her earrings. She captioned the post, “Ho ho ho Merry Christmas.”     Check it out here:                                                                       View this post on Instagram          A post shared by Tamannaah Bhatia (@tamannaahspeaks)                    Khushi Kapoor celebrated Christmas with her close friends, including Vedang Raina. The group chose a relaxed and cosy vibe, wearing colour-coordinated red and white pajamas. They clicked pictures while enjoying cookies and spending quality time together. Khushi shared a series of pictures from their warm holiday setup.                                                                      View this post on Instagram          A post shared by ᴋʜᴜsʜɪ ᴋᴀᴘᴏᴏʀ (@khushikapoor)               Ananya Panday and Kartik Aaryan, who are busy promoting their film Tu Meri Main Tera Main Tera Tu Meri, which released today, also took a moment to wish fans. The duo shared adorable festive pictures and spread Christmas cheer online.     See the pictures here:                                                                        View this post on Instagram          A post shared by KARTIK AARYAN (@kartikaaryan)                              Shilpa Shetty spent her Christmas holidays outdoors with her family. She shared pictures and videos from the celebrations, including a sweet moment where she was seen enjoying a merry-go-round ride with her son.                                                                      View this post on Instagram          A post shared by Shilpa Shetty Kundra (@theshilpashetty)               Sonakshi Sinha and Zaheer Iqbal, one of Bollywood’s most loved couples, posed together beside a Christmas tree. Sharing the moment, Sonakshi captioned the post, “Wish you a holy jolly Christmas.”                                                                 View this post on Instagram          A post shared by Sonakshi Sinha (@aslisona)                              Sidharth Malhotra wished his fans with a simple yet warm Christmas video, captioned “Merry Christmas.” Sara Ali Khan celebrated the festival quietly with a few close friends, keeping things low-key. Madhuri Dixit Nene also shared a heartfelt Christmas wish for her fans, while Riteish Deshmukh and Genelia D’Souza posted festive greetings, adding to the holiday cheer.     Also Read: Allu Arjun, Anushka Sharma & more wish fans a Merry Christmas。    包括 GPS 在内的定位卫星通常包含 20-30 颗处于较高轨道的卫星，任一卫星出现故障都会影响定位效果。另一方面，Starlink 目前在轨道上有大约 3000 颗卫星，计划达到 12000 颗——全部在低轨道上。重大中断的可能性几乎不存在。SpaceX 的高级管理人员在项目启动起初也热衷于这个想法，但随后 Humphreys 收到了坏消息。

B | 伊隆·马斯克告诉他们，“所有其他 LEO 通信网络都已破产，因此我们必须完全专注于避免破产。

C | 我们承受不起任何干扰”。不过这并未停止 Humphreys 前进的步伐。他的实验室一直专注于对 Starlink 卫星和地面接收器之间的信号进行逆向工程。他们发现有足够的信息来开发与 GPS 等效的系统。为了分析来自 Starlink 系统的信号，Humphreys 和他的团队通过 Starlink 终端连续播放了 Rafael Nadal 的高清 YouTube 网球视频，并使用单独的附近天线来捕获信号。该团队从未尝试破解 Starlink 使用的加密，而是对各种同步序列感兴趣——可预测的重复信号有助于卫星和地面接收器之间的协调。每个序列还包含与卫星距离和速度相关的信息。

D | 汉弗莱斯和他的团队发现，星链卫星每毫秒传输大约四个序列，Humphreys 表示“这对于他们的系统进行双重定位来说非常棒”。根据目前的分析，团队估计他们可以达到30m左右的地面精度，但如果他们能让Starlink团队合作，并在同步流中添加与每颗卫星位置相关的数据，他们可以将精度细化到1m以下。作为对比，目前主流定位系统的精度如下：● 北斗: 3.6m (public, global), 2.6m (AsiaPac, public), 10cm (encrypted) ● Galileo: 1m (public) 1cm (encrypted) ● GLONASS: 2.8 – 7.38m ● GPS: 500 – 30cm (encrypted resolution not reported)。

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