Difference between revisions of "OpenBTS: Kalibrasi"
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| Line 200: | Line 200: | ||
* Frekuensi Clock 20MHz | * Frekuensi Clock 20MHz | ||
| − | * Kanal 52 | + | * Kanal 52 atua frekuensi 945.4MHz |
| − | * Offset | + | * Offset hasil pengukuran + 500Hz |
Maka clock 20MHz harus di offset sebesar | Maka clock 20MHz harus di offset sebesar | ||
| Line 207: | Line 207: | ||
-500Hz/945.4MHz*20MHz=-10.6 Hz | -500Hz/945.4MHz*20MHz=-10.6 Hz | ||
| − | Tepatnya | + | Tepatnya menjadi |
19,999,990 Hz | 19,999,990 Hz | ||
Revision as of 05:13, 15 April 2012
Sumber: http://gnuradio.org/redmine/wiki/1/OpenBTSClockCalibration
Jika kita tidak mempunyai peralatan lab yang baik dan kita ingin mengetahui akurasi clock USRP, kita dapat menggunakan aplikasi Kalibrator (Copyright (c) 2009 Joshua Lackey, Alexander Chemeris). Tentunya kita tidak mungkin memperoleh hasil yang baik seperti hi-tech lab, tapi cukup lah untuk mengetahui error kalibrasi clock yang ada.
Download
Download dari
http://thre.at/kalibrate/kal-v0.4.1.tar.bz2 git clone https://github.com/ttsou/kalibrate-uhd kalibrate-uhd
Compile
cp kal-v0.4.1.tar.bz2 /usr/local/src/ cd /usr/local/src tar jxvf kal-v0.4.1.tar.bz2 cd /usr/local/src/kal-v0.4.1 ./bootstrap && CXXFLAGS='-W -Wall -O3' ./configure && make
Menjalankan
cd /usr/local/src/kal-v0.4.1/src/ ./kal -h
Hasil
kalibrate v0.4.1, Copyright (c) 2010, Joshua Lackey 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, GSM900, EGSM, DCS, PCS) -f frequency of nearby GSM base station -c channel of nearby GSM base station -b band indicator (GSM850, GSM900, EGSM, DCS, PCS) -R side A (0) or B (1), defaults to B -A antenna TX/RX (0) or RX2 (1), defaults to RX2 -g gain as % of range, defaults to 45% -F FPGA master clock frequency, defaults to 52MHz -v verbose -D enable debug messages -h help
Scanning 1800
Menjalankan
cd /usr/local/src/kal-v0.4.1/src/ ./kal -s 1800 -F 64000000 -b DCS
Hasil
kal: Scanning for DCS-1800 base stations. DCS-1800: chan: 513 (1805.4MHz + 14.952kHz) power: 5336.89 chan: 514 (1805.6MHz + 14.954kHz) power: 1927.35 chan: 517 (1806.2MHz + 14.952kHz) power: 3715.71 chan: 518 (1806.4MHz + 14.983kHz) power: 1717.65 chan: 519 (1806.6MHz + 14.969kHz) power: 5159.38 chan: 520 (1806.8MHz + 14.951kHz) power: 2017.03 chan: 542 (1811.2MHz + 15.092kHz) power: 4554.77 chan: 544 (1811.6MHz + 15.084kHz) power: 3730.97 chan: 569 (1816.6MHz + 15.181kHz) power: 6196.37 chan: 570 (1816.8MHz + 15.172kHz) power: 1924.81 chan: 613 (1825.4MHz + 15.237kHz) power: 15746.19 chan: 614 (1825.6MHz + 15.242kHz) power: 6683.53 chan: 616 (1826.0MHz + 15.260kHz) power: 12953.63 chan: 617 (1826.2MHz + 15.248kHz) power: 4816.39 chan: 620 (1826.8MHz + 15.224kHz) power: 4274.58 chan: 625 (1827.8MHz + 15.268kHz) power: 3613.13 chan: 626 (1828.0MHz + 15.313kHz) power: 1926.56 chan: 627 (1828.2MHz + 15.274kHz) power: 3536.15 chan: 628 (1828.4MHz + 15.267kHz) power: 2346.39 chan: 629 (1828.6MHz + 15.288kHz) power: 7923.44 chan: 632 (1829.2MHz + 15.316kHz) power: 5417.85 chan: 633 (1829.4MHz + 15.312kHz) power: 2652.96 chan: 689 (1840.6MHz + 15.602kHz) power: 3734.25 chan: 692 (1841.2MHz + 15.587kHz) power: 11674.51 chan: 693 (1841.4MHz + 15.586kHz) power: 5294.69
Scanning 900
Untuk Clock 64MHz Menjalankan
cd /usr/local/src/kal-v0.4.1/src/ ./kal -s 900 -F 64000000 -b GSM900
Untuk Clock 52MHz Menjalankan
cd /usr/local/src/kal-v0.4.1/src/ ./kal -s 900 -F 52000000 -b GSM900 -vv
Hasil
FPGA clock : 52000000 Decimation : 192 Sample rate: 270833.343750 kal: Scanning for GSM-900 base stations. channel detect threshold: 9458.928125 GSM-900: chan: 36 (942.2MHz + 423Hz) power: 194131.34 chan: 37 (942.4MHz + 428Hz) power: 50474.90 chan: 38 (942.6MHz + 412Hz) power: 50189.51 chan: 39 (942.8MHz + 397Hz) power: 14175.00 chan: 40 (943.0MHz + 483Hz) power: 38742.63 chan: 41 (943.2MHz + 510Hz) power: 50648.68 chan: 61 (947.2MHz + 503Hz) power: 73085.29 chan: 62 (947.4MHz + 490Hz) power: 18121.82 chan: 66 (948.2MHz + 512Hz) power: 16138.32 chan: 68 (948.6MHz + 491Hz) power: 18167.35 chan: 113 (957.6MHz + 548Hz) power: 24349.49 chan: 114 (957.8MHz + 493Hz) power: 11841.20 chan: 115 (958.0MHz + 520Hz) power: 20344.80 chan: 119 (958.8MHz + 505Hz) power: 31772.62 chan: 120 (959.0MHz + 535Hz) power: 10510.76 chan: 123 (959.6MHz + 565Hz) power: 18004.66
Scanning 850
Menjalankan
cd /usr/local/src/kal-v0.4.1/src/ ./kal -s 850 -F 64000000
Hasil
Scanning Channel
Menjalankan
cd /usr/local/src/kal-v0.4.1/src/ ./kal -c 513 -F 64000000 -b DCS
Hasil
kal: Calculating clock frequency offset. Using DCS-1800 channel 513 (1805.4MHz) average [min, max] (range, stddev) + 17.109kHz [17087, 17136] (50, 14.080007) overruns: 0 not found: 0
Kalkulasi Kalibrasi
Misalnya kita menggunakan BTS pada channel 47 untuk kalibrasi
./kal -F 52000000 -c 47
Hasil
kal: Calculating clock frequency offset. Using GSM-900 channel 47 (944.4MHz) average [min, max] (range, stddev) + 501Hz [479, 524] (45, 13.227342) overruns: 0 not found: 0
Misalnya kita menggunakan BTS pada channel 61 untuk kalibrasi
./kal -F 52000000 -c 61
Hasil
kal: Calculating clock frequency offset. Using GSM-900 channel 61 (947.2MHz) average [min, max] (range, stddev) + 494Hz [481, 504] (23, 6.454695) overruns: 0 not found: 0
Proses Kalibrasi
Ukur
Gunakan Kalibrate untuk mengukur offset frekuensi, misalnya pada channel 52
./kal -f 945400000
Misalnya hasilnya adalah
kal: Calculating clock frequency offset. Using GSM-900 channel 52 (945.4MHz) average [min, max] (range, stddev) + 498Hz [429, 555] (126, 32.384548) overruns: 0 not found: 165
Hitung Offset
Hitung dengan asumsi
- Frekuensi Clock 20MHz
- Kanal 52 atua frekuensi 945.4MHz
- Offset hasil pengukuran + 500Hz
Maka clock 20MHz harus di offset sebesar
-500Hz/945.4MHz*20MHz=-10.6 Hz
Tepatnya menjadi
19,999,990 Hz
Set Ulang ClockTamer
Set ulang OSC pada ClockTamer menggunakan
sudo screen /dev/ttyACM0 115200,cs8,-ixon,-ixoff
Masukan
SET,,OSC,19999990 STE
Kalau mau lebih presisi mungkin bisa
SET,,OSC,19999989 STE
Scan Ulang Frekuensi
Hasilnya harus lebih baik
./kal -s 900 -F 52000000 -b GSM900 -vv
Hasilnya
FPGA clock : 52000000 Decimation : 192 Sample rate: 270833.343750 kal: Scanning for GSM-900 base stations. channel detect threshold: 9212.598092 GSM-900: chan: 35 (942.0MHz - 1Hz) power: 58221.58 chan: 36 (942.2MHz - 15Hz) power: 277657.07 chan: 37 (942.4MHz - 16Hz) power: 69884.02 chan: 38 (942.6MHz - 39Hz) power: 51768.26 chan: 39 (942.8MHz - 57Hz) power: 14338.21 chan: 40 (943.0MHz + 22Hz) power: 39493.83 chan: 41 (943.2MHz + 46Hz) power: 51872.61 chan: 61 (947.2MHz + 74Hz) power: 52471.92 chan: 62 (947.4MHz + 54Hz) power: 12957.55 chan: 66 (948.2MHz + 46Hz) power: 15464.87 chan: 72 (949.4MHz - 35.394kHz) power: 11784.47 chan: 109 (956.8MHz + 19Hz) power: 18475.41 chan: 113 (957.6MHz + 42Hz) power: 17960.76 chan: 114 (957.8MHz + 46Hz) power: 11643.24 chan: 119 (958.8MHz + 16Hz) power: 28815.53 chan: 120 (959.0MHz + 36Hz) power: 9772.22 chan: 123 (959.6MHz + 36Hz) power: 16534.37
Referensi
- http://gnuradio.org/redmine/wiki/1/OpenBTSClockCalibration
- http://sourceforge.net/mailarchive/attachment.php?list_name=openbts-discuss&message_id=3d032e5d0911101431o5bb31844mdfe80ae4fc9789ea@mail.gmail.com&counter=1
- http://thre.at/kalibrate/
- http://thre.at/kalibrate/#install
- http://ttsou.github.com/kalibrate-uhd/
- https://github.com/ttsou/kalibrate-uhd
Pranala Menarik
Persiapan
- USRP: High Precision Clock
- USRP: Menyambungkan ClockTamer ke USRP1
- USRP: Kalibrasi ClockTamer
- USRP: ClockTamer Control Protocol
- USRP: Instalasi Board
- OpenBTS: GIT Source Code
OpenBTS 2.6
- GNURadio
- GNURadio: Ubuntu Install
- GNURadio: Ubuntu Install GNURadio 3.4.2 *RECOMMENDED*
- GNURadio: Contoh Aplikasi
- GNURadio: Spectrum Analizer GSM
- GNURadio: Mengubah board RFX1800 menjadi RFX900
- GNURadio: Programming Untuk Pemula
- OpenBTS: Ubuntu Install
- OpenBTS: Konfigurasi
- OpenBTS: Kalibrasi
- OpenBTS: Konfigurasi Asterisk untuk OpenBTS
- OpenBTS: Menjalankan smqueue
- OpenBTS: Mengoperasikan BTS
- OpenBTS: Tampilan di Nokia saat pakai OpenBTS
- OpenBTS: Operasi 1800 MHz
- OpenBTS: Beberapa Tips
- OpenBTS: USRP2
- OpenBTS: Amplifier
- OpenBTS: SMS
- AirProbe
OpenBTS 2.8
- GNURadio: Ubuntu 11.10 Install *NOT RECOMMENED*
- GNURadio: Ubuntu 11.10 instalasi menggunakan Repo NOT RECOMMENDED
- GNURadio: Ubuntu 11.10 Instal GNURadio 3.3.0
- GNURadio: Ubuntu 11.10 Instal GNURadio 3.4.2
- GNURadio: Ubuntu 11.10 Install dari GIT GNURadio
- GNURadio: Ubuntu 11.10 cek USRP Daughter Board
- OpenBTS: Ubuntu 11.10 Install
- OpenBTS: 2.8 dari SVN Install RECOMMENDED
- OpenBTS: 2.8 Instalasi Real Time Asterisk
- OpenBTS: 2.8 Konfigurasi
- OpenBTS: Database SQLite
Ettus E110
- OpenBTS: E110 Cara Login
- OpenBTS: E110 Install Image di MicroSD
- OpenBTS: E110 Cek Daughter Board
- OpenBTS: E110 Mengubah Master Clock
- OpenBTS: E110 Kalibrasi Clock
- OpenBTS: E110 Bekerja dengan opkg
- OpenBTS: E110 GNURadio
- OpenBTS: E110 Install UHD Image
- OpenBTS: E110 Instalasi OpenBTS
- OpenBTS: E110 Instalasi OpenBTS 2.6 *NOT RECOMMENDED*
Lain Lain
- OpenBTS: Materi Magang di ICTWATCH
- OpenBTS: Seminar Outline
- OpenBTS: Workshop Outline
- Membuat Base Station GSM Open Source
- Teknologi Selular
- GSM: Daftar Channel Frekuensi
- Wireless Internet
- OpenBSC
- AirProbe
- Base station subsystem
- GSM
- Asterisk
- Mobile phone
Catatan Legal dan Pendukung
- Siapa Bilang OpenBTS Ilegal?
- OpenBTS: Catatan MNC dan MCC Indonesia
- OpenBTS : Alokasi Frekuensi Operator GSM Indonesia