http://sdr.osmocom.org/trac/wiki/rtl-sdr
RF tuner 為(64MHZ - 1700 MHz). (Maybe work in ~2000MHz)
沒壓縮的基頻取樣 (up to 2.8 MS/s 8-bit I+Q) 丟入電腦Gnu Radio 再做無線訊號處理
I+Q 科普
頻率
RTL2332U 是一個應用SDR (軟體無線電的單晶片) 非寫死調變演算法的 ASIC
BUG:取樣因為沒buffer問題 所以好像在硬碟會掉包 SSD或ramdisk 會比較理想
晶片規格
http://www.linuxtv.org/wiki/index.ph...alTek_RTL2832U
Notes | |
---|---|
Resolution | 8 bits |
Minimum sample rate | > 900 ksps (must be greater!) |
Maximum sample rate | 3.2 Msps |
Nominal sample rate | 1 Msps (much higher and subtle signal degradation) |
Clock | 28.8 MHz internal oscillator (expect phase noise) |
Spectrum flatness | (Definitely not flat at centre, worse with low gain) |
AGC | Disabled for E4000, but still active somewhere (in demod?) |
Sensitivity | TBD (decent all things considered) |
Quality | Don't expect anything remotely close to USRP |
Price |
討論
http://www.reddit.com/r/RTLSDR/
https://groups.google.com/forum/#!forum/sdr-widget
HDSDR
HDSDR 是Windows 下軟體無線電軟體 ,可搭配RTL-SDR做RF頻譜訊號檢測
How to
http://thenewtech.tv/community/dongular-deviation
http://users.on.net/~balint/HDSDR_install-2.11.exe
http://wiki.spench.net/wiki/USRP_Interfaces
GNU radio 教學
安裝gnu radio apt-get install gnuradio
取樣程式
sudo apt-get install libusb-1.0-0-dev
cd rtl-sdr
cd src
make
http://wiki.spench.net/wiki/Gr-baz#rtl_source_c
Sniffer Gprs
http://srlabs.de/gprs/
Sniffer GSM