N0BOY / FT8CN

Run FT8 on Android
MIT License
383 stars 40 forks source link

【求助】ft8_lib中kiss_fftr快速傅里叶变换后如何得到码元? #82

Closed liuaifu closed 1 year ago

liuaifu commented 1 year ago

国内可能就这里对FT8_lib最熟悉了,看了好长时间,快速傅里叶变换后云里雾里,还用到科斯塔斯环,可否给讲一下kiss_fftr后如何解调得到码元?也欢迎老外帮忙讲解一下。

The person most familiar with FT8_lib in China may be here. After looking at it for a long time, it is foggy after fast Fourier transform, and Costas loop is also used. Can you tell me how to get the channel symbols or FT8 Bits after kiss_fftr? Foreigners are also welcome to help explain.

liuaifu commented 1 year ago

基本上搞清楚了。

bg7yoz commented 1 year ago

粗略来说,大概有一下几步: 1.快速傅立叶变换,得到频域数据。 2.同步。根据同步符号(开始(0-7)、中间(36-43)、结尾(72-79)科斯塔阵列)确定信号的位置(频率和时间偏移)。 3.基于LDPC解码,做CRC校验,解包。