RTL-SDR
內容表格
- 1. 軟體無線電
軟體無線電
國外專案位置 http://sdr.osmocom.org/trac/wiki/rtl-sdr
社群軟體對DVB-T 電視棒Linux 下驅動編寫 而發現最新便宜價廉軟體無線電硬體 RTL-SDR
http://thread.gmane.org/gmane.linux....61/focus=44461
已知Taobao 產品相容Link
http://item.taobao.com/item.htm?id=15223055608
RTL2832U 是一個應用SDR (軟體無線電的晶片) 非寫死調變演算法的 ASIC
E4000 RF tuner 為(64MHZ - 1700 MHz). (Maybe works in ~2000MHz 這樣才方便做XXX Sniffer)
E4000->沒壓縮的 I+Q基頻->RTL2832U 取樣 丟入電腦做
I+Q 講解
無法接受短波HF 頻帶(1．8MHz到29．7MHz)
解決方法 做塊升頻版
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
RTL2832U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 |
E4000 RF IC Spec (零中頻設計)
Funcube Dongle 是用音效卡IC做調變...因此取樣寬度就只有96Khz...
http://www.funcubedongle.com/
應用
1.業餘無線電愛好者Ham (收聽)
2.類比與數位(加密)無線分析
3.無線頻譜量測與觀察
4.解決傳統無線器材價格與攜帶性問題 並且直接做好A/D +解碼
真實應用
1.http://michelebavaro.blogspot.it/201...dr-domain.html
GPS decode (表示北斗星跟Galileo 應該有機會可用於學習receive and decode)
2. 接收 NOAA-18 氣象衛星
http://www.oz9aec.net/index.php/gnu-...gle-on-the-air
3.P25數位無線電 接收器
http://www.youtube.com/watch?v=wShOLgW2tmI
ttp://wiki.spench.net/wiki/gr-baz#rtl_source_c Follow me @spenchdotnet http://twitter.com/spenchdotnet
OP25: http://op25.osmocom.org/
淺談P25無線電通信標準和技術 http://anta-technology.blogspot.com/2011/05/p25.html
4.飛行數位航管 RADAR訊號
http://spench.net/drupal/research/mode-s | http://wiki.spench.net/wiki/Modez
https://www.youtube.com/watch?v=bKzii5K3AqA
5.Pocsag( 老call機無線協定)
https://github.com/OpCode1300/RTLSDR
ˊ6.GXM Sniifer (需要二個 RTL-SDR)
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://wiki.spench.net/wiki/USRP_Interfaces
安裝 http://users.on.net/~balint/HDSDR_install-2.11.exe
Gnu Radio 使用說明(整理中)
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
gr-baz 增加GNU Radio 功能 方塊 簡化安裝
原 Driver and software in windows
http://www.kuaipan.com.cn/file/id_20...3046608910.htm
SDR 範例
FM radio
http://www.reddit.com/r/RTLSDR/comme...radio_grc_rtl/
如何判定調變
http://www.reddit.com/r/RTLSDR/comme...e_recognition/
http://safety.iot.gov.tw/research/fi...5%E4%BC%B0.pdf