2015-06-17 08:04:11 +00:00
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DFM-06:
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GPS Chip:
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Navman/Telit
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Modulation: FSK
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2019-03-09 14:52:46 +00:00
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raw: 2500 baud
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Manchester codiert -> 1250 bit/s
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2015-06-17 08:04:11 +00:00
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Frame: 280 bit, davon 16 bit Header 0x45CF, dann
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3 Bloecke (CFG,DAT1,DAT2) mit (56,104,104) bits
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Interleaved: 7x8, 13x8, 13x8
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erweiterter systematischer [8,4]-Hamming-Code, erste 4 bit sind Daten
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Big Endian
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2020-06-12 11:06:08 +00:00
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(SiRF msg ID 41: Geodetic Navigation Data)
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2017-08-12 08:56:48 +00:00
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GPS_DAT-Block 48bit + 4bit-PCK_ID 0x0..0x8 (letztes nibble):
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2015-06-17 08:04:11 +00:00
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PCK_ID bitpos
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0x0 24..31 Counter: 8 bit
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2020-06-12 11:06:08 +00:00
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0x1 0..31 SV/PRN bitmap
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32..47 UTC-msec : 16bit (sec*1e3), GPS = UTC + 18s (ab 1. Jan. 2017)
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2015-06-17 08:04:11 +00:00
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0x2 0..31 GPS-lat : 32bit, Faktor 1e7
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2015-06-17 08:07:23 +00:00
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32..47 hor-V m/s: 16bit, Faktor 1e2
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2015-06-17 08:04:11 +00:00
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0x3 0..31 GPS-lon : 32bit, Faktor 1e7
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2015-07-06 07:37:36 +00:00
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32..47 direction: 16bit, Faktor 1e2 (unsigned, 0-36000)
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2015-06-17 08:04:11 +00:00
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2020-06-12 11:06:08 +00:00
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0x4 0..31 GPS-alt m: 32bit, Faktor 1e2 (Alt_ellipsoid)
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2015-07-06 07:37:36 +00:00
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32..47 ver-V m/s: 16bit, Faktor 1e2 (signed)
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2015-06-17 08:04:11 +00:00
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2020-06-12 11:06:08 +00:00
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0x5 0..15 dMSL = Alt_MSL - Alt_ellipsoid = -N = -geoid_height , Faktor 1e2 (signed)
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2015-06-17 08:04:11 +00:00
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0x8 0..11 Jahr : 12bit
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12..15 Monat: 4bit
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16..20 Tag : 5bit
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21..25 Std : 5bit
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26..31 Min : 6bit
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0xF 0..47 000000000000
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2016-09-04 10:35:44 +00:00
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2017-08-12 08:56:48 +00:00
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CFG/MEAS-Block beginnt mit nibble
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0,1,2, 0,1,3, 0,1,4, 0,1,5, 0,1,6,
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0,1,2, ...
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DFM-06 (341110), NXP
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Seriennummer/ID:
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CFG-Block 6xxxxxx (Kanal 6)
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e.g.
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6324695 -> 324695
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(fehlt bei aelteren DFMs)
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DFM-09 (543410), STM32
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Seriennummer/ID:
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2016-09-04 10:35:44 +00:00
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CFG-Block Acaaaab (Kanal A)
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2016-09-04 11:23:45 +00:00
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b=0: high 16bit aaaa
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b=1: low 16bit aaaa
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2017-08-12 08:56:48 +00:00
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e.g.
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2016-09-04 10:35:44 +00:00
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AC00070 : 0x0007
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ACDB131 : 0xDB13
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-> 0x0007DB13 = 514835
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2018-07-19 11:40:23 +00:00
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PS-15
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Seriennummer/ID:
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CFG-Block 70aaaab (Kanal 7)
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b=0: high 16bit aaaa
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b=1: low 16bit aaaa
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e.g.
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7001040 : 0x0104
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7004C61 : 0x04C6
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-> 0x010404C6 = 17040582
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2016-09-04 10:35:44 +00:00
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2017-08-12 08:56:48 +00:00
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measure_sensor, Kanaele n=0,..,4:
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nexxxxx: float24 (4bit_exp + 20bit_mantisse)
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fn = xxxxx/2^e
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bei DFM-NXP(8bit) ist letztes nibble=0,
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d.h. nexxxx0 (somit 4+16=20 bit)
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n=3: Rs (dfm6-pcb 10k, dfm9-pcb 20k)
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n=4: 220k
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n=0: Thermistor + Rs
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Temperatur-Sensor, DFM-06:
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NTC-Thermistor EPCOS B57540G0502 ?
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R/T No 8402, R25=5k
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f0 = a*(R+Rs) , R: thermistor
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f3 = a*Rs , Rs = 10k,20k
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f4 = a*220k , a: A/D-faktor
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(f0-f3)/f4 = R/220k
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ntc thermistor approx:
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R/Ro = exp(B(1/T-1/To))
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1/T = 1/To + 1/B * log(R/Ro)
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To = 25C = 273.15+25 Kelvin
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Ro = 5k
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B(0C..100C) = 3450 Kelvin
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B(-55C..30C) etwas niedriger (z.B. 3260 Kelvin)
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R/Ro = (f0-f3)/f4 * 220k/5k
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EEPROM: GRAW-Kalibrierdaten -80C..+40C ?
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2016-09-04 13:51:00 +00:00
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DFM-06 und DFM-09 haben unterschiedliche Polaritaet bzw. Manchester-Varianten
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DFM-06 hat Kanaele 0..6 (anfangs nur 0..5)
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DFM-09 hat Kanaele 0..A
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Ausnahme: erste DFM-09-Versionen senden wie DFM-06
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2018-07-19 11:40:23 +00:00
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PS-15 hat Kanaele 0..7 (Polaritaet wie DFM-06)
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2016-09-04 13:51:00 +00:00
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2016-09-04 10:35:44 +00:00
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2017-08-12 08:56:48 +00:00
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alter Quellcode (Codierung, Telemetrie):
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https://www.amateurfunk.uni-kl.de/projekte-aktivitaeten/decoder-wettersonden/
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Sensor-Info:
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https://www.imk-tro.kit.edu/download/Diplomarbeit_Fuetterer.pdf
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