Difference between revisions of "OpenBTS: Kalibrasi"

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==Kalkulasi Kalibrasi==
 
==Kalkulasi Kalibrasi==
 +
 +
Misalnya kita menggunakan BTS pada channel 47 untuk kalibrasi
 +
 +
./kal -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
  
 
==Referensi==
 
==Referensi==

Revision as of 16:14, 14 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

Hasil 

kal: Scanning for GSM-900 base stations.
GSM-900:
	chan: 36 (942.2MHz + 431Hz)	power: 184230.74 
	chan: 37 (942.4MHz + 423Hz)	power: 48819.79
	chan: 38 (942.6MHz + 400Hz)	power: 45724.68
	chan: 39 (942.8MHz + 410Hz)	power: 13790.48
	chan: 40 (943.0MHz + 535Hz)	power: 39825.30
	chan: 41 (943.2MHz + 517Hz)	power: 53341.15
	chan: 47 (944.4MHz + 479Hz)	power: 11767.49
	chan: 61 (947.2MHz + 497Hz)	power: 76964.16
	chan: 62 (947.4MHz + 489Hz)	power: 18347.26
	chan: 66 (948.2MHz + 482Hz)	power: 16231.88
	chan: 68 (948.6MHz + 505Hz)	power: 17999.91
	chan: 109 (956.8MHz + 583Hz)	power: 18842.23
	chan: 113 (957.6MHz + 498Hz)	power: 25017.99
	chan: 115 (958.0MHz + 480Hz)	power: 19561.74
	chan: 119 (958.8MHz + 518Hz)	power: 31980.02
	chan: 120 (959.0MHz + 508Hz)	power: 10448.34
	chan: 123 (959.6MHz + 518Hz)	power: 17040.56

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 -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

Referensi

Pranala Menarik

Persiapan

OpenBTS 2.6

OpenBTS 2.8

Ettus E110

Lain Lain

Catatan Legal dan Pendukung

Catatan Sejarah

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