如何测试 USRP2

准备:

1. 安装操作系统: 需选择 OS
2. 安装 GNU Radio: 创建指导
3. (可选) 阅读硬件平台文档: USRP2 介绍
   背景阅读: Blossom Research, LLC
   全部 Datasheets 下载：
4. (可选) 阅读驱动（driver）代码
   the source codes related to USRP:
   
   /usrp
   

   firmware: for 8051 in USB controller, mostly writen as .c and .a51
   FPGA: for FPGA, mostly writen as .v (it seems fpga only has SRAM inside, so it need to download software for fpga every time)
   host: for PC, mostly writen as .cc
   

   /gr-usrp
   

   driver for dauther board: mostly writen as .py and .cc
   

   /gnuradio-example/python/usrp
   

   example for single usrp board: all writen in .py
   

   /gnuradio-example/python/multi-usrp
   

   example for multi usrp boards: all writen in .py

开始测试:

1. 如何上电开始:
   
   step1. before plug in USB cable, open two terminal.
   step2. to see a real time display of all log messages: tail -f /var/log/messages (to check the usb driver is correctly installed)
   
   如何停止及断电:
   
   step1. stop the program.
   step2. disconnect USB connection and power off
2. test a script for usrp first without daughter board, which file I need to test?
   --http://www.comsec.com/wiki?UsrpInstall
   gnuradio\gnuradio-examples\python\usrp\usrp_siggen.py & usrp_fft.py
3. how to test the transmitter and receiver for daughter board?
   The antenna should be connect by Tx/Rx SMA but NOT Rx2! there is a switch for Rx2 and the switch is off in default!
   The Tx and Rx can NOT be connected directly by cable! need a attenuator about 40-50 dB!!
   
   • /gnuradio-examples/python/usrp/usrp_siggen.py and usrp_fft.py to observe signal
   • /gnuradio-examples/python/digital/benchmark_tx.py and benchmark_rx.py to test data transmission.
   The boards need to be at least 3m apart. --/home/james/gnuradio/gnuradio-examples/python/digital/README
   
   • use tx_voice.py and rx_voice.py to test voice transmission.
   • some also said to test /gnuradio-examples/python/usrp/usrp_nbfm_ptt.py to test full duplex voice call, but I can't make it works.

测试声音:

1. gnuradio-examples\python\audio\dial_tone.py as tutorial
2. gnuradio-examples\python\audio\audio_copy.py
   
   gnuradio-examples\python\audio\audio_to_file.py
   gnuradio-examples\python\audio\audio_play.py
3. gnuradio-examples\python\digital_voice\encdec.py to test by one USRP
4. gnuradio-examples\python\digital\tx_voice.py
   
   gnuradio-examples\python\digital\rx_voice.py to test by two USRP

测试数据:

• gnuradio-examples\python\digital\benchmark_tx.py
  • gnuradio-examples\python\digital\benchmark_rx.py to test by two USRP

其它:

1. http://www.nabble.com/High-packet-error-and-reception-problems-with-RFX-2400-t3522095.html
   ./benchmark_tx.py -f 2412M --bitrate 500k -v --tx-amplitude=30000
   usrp_siggen.py and usrp_oscope.py
   ./benchmark_rx.py -f 2412M --bitrate 100k -v --rx-gain=75
   --in digital folder
2. http://staff.washington.edu/jon/gr-osx/gr-osx-usrp.html#using
   benchmark_usb.py Estimate throughput of USB
   usrp_siggen.py Signal generator
   usrp_oscope.py Oscilloscope (screenshot)
   usrp_fft.py Spectrum analyzer (screenshot)

注： （以上整理仅供 GNU Radio 爱好者参考!  email:  gnuradio@microembedded.com）