kalibrate-RTL包装说明

Kalibrate，或KAL，可以扫描在给定频带GSM基站，并且可以使用那些GSM基站计算本地振荡器频率偏移量。 资料来源：https://github.com/steve-m/kalibrate-rtl

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• 作者：约书亚拉基，史蒂夫马克格拉夫
• 许可：其它

  0x01 列入kalibrate-RTL封装工具

  KAL - 计算本振频率使用GSM基站偏移

  :~# kal -h
  kalibrate v0.4.1-rtl, Copyright (c) 2010, Joshua Lackey
  modified for use with rtl-sdr devices, Copyright (c) 2012, Steve Markgraf
  Usage:
    GSM Base Station Scan:
        kal <-s band indicator> [options]
    Clock Offset Calculation:
        kal <-f frequency | -c channel> [options]
  Where options are:
    -s  band to scan (GSM850, GSM-R, GSM900, EGSM, DCS, PCS)
    -f  frequency of nearby GSM base station
    -c  channel of nearby GSM base station
    -b  band indicator (GSM850, GSM-R, GSM900, EGSM, DCS, PCS)
    -g  gain in dB
    -d  rtl-sdr device index
    -e  initial frequency error in ppm
    -v  verbose
    -D  enable debug messages
    -h  help
  

  0x02 KAL用法示例

  扫描在GSM-850频段GSM 基站（-s GSM850）， 然后使用信道 128（-c 128），以获得 频率偏移： ```bash :~# kal -s GSM850 Found 1 device(s): 0: ezcap USB 2.0 DVB-T/DAB/FM dongle Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle Found Rafael Micro R820T tuner Exact sample rate is: 270833.002142 Hz kal: Scanning for GSM-850 base stations. GSM-850: chan: 128 (869.2MHz - 3.988kHz) power: 486634.32 chan: 143 (872.2MHz - 3.760kHz) power: 56331.63 :~# kal -c 128 Found 1 device(s): 0: ezcap USB 2.0 DVB-T/DAB/FM dongle Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle Found Rafael Micro R820T tuner Exact sample rate is: 270833.002142 Hz kal: Calculating clock frequency offset. Using GSM-850 channel 128 (869.2MHz) average [min, max] (range, stddev)
• 4.093kHz [-4102, -4083] (20, 5.314593) overruns: 0 not found: 0 average absolute error: 4.709 ppm ```

  原文来自https://www.hackfun.org/kali-tools/kalibrate-rtl_zh.html。转载请注明原出处，商用请联系原作者授权。