Hi Ping Fang,
We were told that the SDK will become available for download on this page: S32R Radar Microcontroller - S32R27|NXP
I checked the page but it is still not there. I'll try to check internally to see what was the cause of delays.
Thank you for your interest
It depends on your plans of using it.
If you wish to simulate the RADAR processing then please refer to https://community.nxp.com/message/970502
If you wish to start the development for the board with C-source, then you should refer to the SDK release notes for the appropriate environment setup and once you install the correct version of the S32 Design Studio then you will be able to run the examples from the SDK or go ahead with your own development starting from those examples.
Hope this helps!