[Docs]: 缺少「坐标系- radar」文档 #6725

We can create a new document and add the missing ones.

@mingcheng Give it to me

👋 @mingcheng , just a friendly reminder to submit your contributions within 7 days! If no updates are made within this timeframe, the issue will be reassigned to others. Let us know if you have any questions! 😄

你好 @mingcheng ，恭喜你成功认领任务！请在 7 天内完成贡献哦～如果超时未提交，任务将会被重新分配。如有任何疑问，欢迎随时联系我们！😄

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