1、 / 24730-21 2014 (RTLS) 21 2,4 c (DSSS): RTLS, DBPSK BPSK ISO/IEC 24730-21:2012 Information technology Real time locating systems (RTLS) Part 21: Direct Sequence Spread Spectrum (DSSS) 2,4 GHz air interface protocol: Transmitters operating with a single spread code and employing a DBPSK data encodin
2、g and BPSK spreading scheme (IDT) 2015 / 24730-21 2014 II 1 - - . ( . .) - - ( ) , 4, /1 2 355 . 3 - 11 2014 . 1571- 4 / 24730-21:2012 - . (RTLS). 21. - 2,4 c (DSSS): RTLS, - DBPSK BPSK (ISO/IEC 24730-21:2012 Information technology Real time locating systems (RTLS) Part 21: Direct Sequence Spread Sp
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7、-mation technology Real time locating systems (RTLS) Part 2: Direct Sequence Spread Spectrum (DSSS) 2,4 GHz air interface protocol) / 24730-22:2012, . - (RTLS). 22. 2,4 - (DSSS): RTLS, QPSK QPSK (WOQPSK) (ISO/IEC 24730-22:2012, / 24730-21 2014 2 Information technology Real time locating systems (RTL
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9、-2. 5.4 - / 24730-2. 5.5 , 1. - . - : 30 o +50 o. . , - , , - . 2. 3 4 -, . 1 - (DSSS) RTLS 2400 2483,50 25 (ppm), 2441,750 60 / 24730-21 2014 3 1: 10 ( - ) . 2: - - , - , BPSK ( ) DSSS ( -) 59,7 / 0,001% PN 30,521875 25 (ppm) PN 511 PN 0x1CB 1: 56 2: 72 3: 88 4: 152 G(x) = X12 + X11 + X3 + X2 + X + 1 - 0x80F - , 5 - 638 - , 18 - 125 16 2 (ppm) 0,50 , 33 15 100 100 1 / 24730-21 2014 4 2 - (DSSS) RTLS , 2400 2483,50 25 (ppm) 2441,750 26 1: 10 ( - ) . 2: - - , 1) , BPSK ( ) DSSS ( -) 59,7 / 0,001% PN 15,260938 25 (ppm) PN 511 PN 0x8D 1: 56 2: 72 3: 88 4: 152 G(
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