2015-06-17 06:49:52 +00:00
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Modulation AFSK 2400 baud
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2015-11-29 23:15:23 +00:00
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3000 Hz : bit 1
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4800 Hz : bit 0
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2015-06-17 06:49:52 +00:00
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bits : little endian -> byte
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bytes: big endian -> int-value
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2017-01-31 12:35:15 +00:00
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bytes getrennt durch 4 bit 1110:
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8N1: 0 bbbbbbbb 1(11)0 bb... , (11)-idle
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2015-06-17 06:49:52 +00:00
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Datenpaket besteht aus 8 byte:
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header 2 byte 00FF
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2015-06-17 08:05:24 +00:00
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pck_id 1 byte N
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2015-06-17 06:49:52 +00:00
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data 4 byte val (big endian)
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2016-03-03 15:53:46 +00:00
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chksum 2 byte Fletcher16 (hier: byte2 1's-complement am Ende)
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2015-06-17 06:49:52 +00:00
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2015-06-17 08:05:24 +00:00
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Telemetrie pck_id N:
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2015-06-17 06:49:52 +00:00
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0x14: date: 0x00027173 = 160115 -> 2015-01-16
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0x15: time: 0x0001E73F = 124735 -> 12:47:35
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0x16: lat : 0x02D39C9B = 47422619 -> 47+422619/600000=47.704365°
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0x17: lon : 0x006CB603 = 7124483 -> 7+124483/600000=7.2074717°
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0x18: alt : 0x0004AB21 = 305953 -> 305953/10 = 30595.3m
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2016-03-03 13:47:11 +00:00
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2015-06-17 06:49:52 +00:00
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GPS-lat/lon wie NMEA mit Faktor 1e4
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2016-03-03 13:47:11 +00:00
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Checksum:
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2016-03-03 15:53:46 +00:00
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2 byte, Summe ueber byte[0]=pck_id,byte[1]=data[0],...,byte[4]=data[3]
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2016-03-03 13:47:11 +00:00
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byte1: (sum_i byte[i]) & 0xFF
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byte2: (-1 - sum_i byte[i]*(5-i)) & 0xFF = ~(sum_i byte[i]*(5-i)) & 0xFF
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FrameID 0x15 (time):
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00FF 15 0001E5FE F9CB
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00FF 15 0001E5FF FACA <- vorletztes byte +1
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00FF 15 0001E600 FCC7 -> byte2: -1-2*1 Differenz
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00FF 15 0001E601 FDC6
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00FF 15 0001E602 FEC5
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00FF 15 0001E603 FFC4
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00FF 15 0001E604 00C3
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00FF 15 0001E605 01C2
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00FF 15 0001E606 02C1
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2016-03-03 15:53:46 +00:00
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-> Fletcher16:
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5*byte[0]+4*byte[1]+3*byte[2]+2*byte[3]+1*byte[4]
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= byte[0] + (byte[0]+byte[1]) + (byte[0]+byte[1]+byte[2]) + (byte[0]+byte[1]+byte[2]+byte[3]) + (byte[0]+byte[1]+byte[2]+byte[3]+byte[4])
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2016-03-03 13:47:11 +00:00
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PTU-Data: float32?
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