2015-10-30 08:22:43 +00:00
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RS92-SGP
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Modulation: GFSK
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raw: 4800 bit/s
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SGP: 1 frame/s
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raw-frame: 4800 bit
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RS92-SGP: manchester -> 2400 bit
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8N1, startbit, 8 bit, stopbit (-> 10bit/byte)
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Frame: 240 byte, little endian
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error correction: (CRC,) Reed-Solomon
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0x00:
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Header (SGP): 2A 2A 2A 2A 2A 10
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dann: 65 10 [FrameNb] [SondeID]
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0x06:
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65 10
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0x08:
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FrameNb(2byte), 20 20
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0x0C:
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SondeID(8byte), 00 61 00
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0x17:
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Cal_Nb(1byte)
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Wenn Cal_Nb=00, dann
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?? ?? 12 02 FF FF 01 00
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| freq: 0x0212 = 530 -> (400000 + freq*10) kHz
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Frequenzen:
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D7 00 -> 402.15 MHz (Zadar)
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E0 00 -> 402.24 MHz (Udine)
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E6 00 -> 402.30 MHz (Udine/Muenchen/Meiningen)
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0E 01 -> 402.70 MHz (Idar-Oberstein/Kuemmersbruck)
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22 01 -> 402.90 MHz (Hohenspeissenberg)
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5E 01 -> 403.50 MHz (Uccle)
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7C 01 -> 403.80 MHz (Praha)
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86 01 -> 403.90 MHz (De Bilt)
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90 01 -> 404.00 MHz (Udine)
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9A 01 -> 404.10 MHz (Norderney)
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AE 01 -> 404.30 MHz (Schleswig2)
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C2 01 -> 404.50 MHz (Meppen 6,12 Uhr)
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FE 01 -> 405.10 MHz (Meppen 9 Uhr/Lindenberg)
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12 02 -> 405.30 MHz (Essen)
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3A 02 -> 405.70 MHz (Bergen)
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0x46:
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67 3D
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0x48:
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GPS TOW (gps time of week)
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2015-11-02 16:53:17 +00:00
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(Receiver: Common Transmission Time vs Common Reception Time)
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2015-10-30 08:22:43 +00:00
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0x4E:
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PRN
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12*5 bit = 60 bit, auf 8 byte verteilt:
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little endian
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00000111 1122222x
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33333444 4455555x
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66666777 7788888x
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99999AAA AABBBBBx
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0x56..0x61: 12 byte STATUS
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0x62: 12*8 byte GPS DATA
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4 byte pseudochips, 3 byte doppler, 1 byte
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pseudochip-counter 32bit-fract, Faktor 2^(-10)=1/1024
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df = c/(chips/sec) / 2^10 = 299792.458/1023.0/1024.0 = 0.286183844 // c=299792458m/s, 1023000chips/s
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pseudorange[m] = - df[m/chips] * pseudochips[chips]
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delta(pseudochips) = ca 25800 +/- d,
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+ sat kommt naeher
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- sat entfernt sich
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d.h. chip-counter zaehlt, wieviele chips im Intervall schon empfangen wurden;
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wenn sat sich entfernt, weniger chips.
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nach ca 14 min reset
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Bei GPS-Loesung ist DOP-Wert der Konstellation wichtig fuer die Genauigkeit.
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Bei almanac-Daten 500-1000m Fehler moeglich, rinex-ephemeris deutlich genauer.
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0xC8:
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8 byte aux-data (z.B. O3)
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2015-11-02 16:53:17 +00:00
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Bahndaten
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SEM Almanac:
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https://celestrak.com/GPS/almanac/SEM/
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Rinex Ephemeris:
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http://cddis.gsfc.nasa.gov/Data_and_Derived_Products/GNSS/broadcast_ephemeris_data.html
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ftp://cddis.gsfc.nasa.gov/gnss/data/daily/YYYY/DDD/YYn/brdcDDD0.YYn.Z (updated)
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ftp://cddis.gsfc.nasa.gov/gnss/data/daily/YYYY/brdc/brdcDDD0.YYn.Z (final)
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GPS calendar:
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http://adn.agi.com/GNSSWeb/
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Geoid:
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http://geographiclib.sourceforge.net/cgi-bin/GeoidEval
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2015-10-30 08:22:43 +00:00
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weitere Infos:
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http://www.vaisala.com/Vaisala%20Documents/Brochures%20and%20Datasheets/RS92SGP-Datasheet-B210358EN-F-LOW.pdf
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http://www.vaisala.com/Vaisala%20Documents/Vaisala%20News%20Articles/VN164/VN164_State-of-the-Art_Radiosonde_Telemetry.pdf
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http://brmlab.cz/project/weathersonde/
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2016-05-26 08:51:55 +00:00
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http://prohu.altervista.org/convert.pdf (PTU, Haeberli 2001)
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2015-10-30 08:22:43 +00:00
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