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A free, accurate tool to decode VHF ACARS message via RTL SDR hardware
This project forked from comcat/acarsx
A free, accurate tool to decode VHF ACARS message via RTL SDR hardware
ACARSX 1. Overview =========== acarsx is a free, realtime and accurate ACARS demodulator for embeded linux. It can be run in a 3G router (TP-LINK W703n, TLMR13U...) as a daemon to supply net service. This tool is based on the project of acarsdec 2.3 hosted in sourceforge. 1.1 Features ------------- + Up to six channels decoded simultaneously + Error detection AND correction + Could send packet over UDP in planeplotter format 1.2 Usage ---------- acarsx [options] -r <rtl_dev_num> f1 [f2...f6] <rtl_dev_num> is the rtl dongle number starting from 0 f1 and optionaly f2 to f6 are frequencies in Mhz Example: acarsx -r 0 131.450 131.825 Options: -v verbose output -A don't display uplink messages -o <format> output format: 0, no log; 1, one line by msg; 2, full(default) -l <logfile> append log messages to logfile (Default: stdout) -n <ip:port> send acars messages to ip:port on UDP -g <gain> set rtl preamp gain in tenth of db (ie. -g 70 for +7db) -p <ppm> set rtl ppm frequency correction -h show this help message 1.3 Build ---------- It depends on 1 external library: librtlsdr. It is for software radio rtl dongle. The lib homepage: http://sdr.osmocom.org/trac/wiki/rtl-sdr 2. ACARS =========== ACARS (Aircraft Communications Addressing and Report System) is a digital datalink system for transmission of short messages between aircraft and ground stations via airband radio (VHF/HF) or satellite (Iriduim/Inmarsat). The protocol was designed by ARINC (Aeronautical Radio, Incorporated) and deployed in 1978, using the Telex format. 2.1 Specicication ------------------ The core specification documents of the ACARS: o ARINC 618, AIR/GROUND CHARACTER-ORIENTED PROTOCOL SPECIFICATION o ARINC 620, DATALINK GROUND SYSTEM AND INTERFACE SPECIFICATION o ARINC 622, ATS Data Link Applications over ACARS Air-Ground Network o ARINC 623, CHARACTER-ORIENTED AIR TRAFFIC SERVICE (ATS) APPLICATIONS 2.2 VHF Frequency ------------------ 118MHz - 136.975MHz, 25KHz Step, 760 channels o 131.450MHz China(Including Hong Kong and Macau) o 131.450MHz Japan, Mongolia, Australia o 131.450MHz Southeast Asia(Thailand, Malaysia, Singapore, Philippines) o 131.550MHz North America(Canada, United states, Mexico) o 131.550MHz South America o 131.550MHz Guam, Saipan o 131.725MHz South Korea, Taiwan o 131.825MHz India o 131.825MHz Europe and Middle East o 131.475MHz Air Canada o 136.850MHz SITA North American 2.3 DSP -------- DSP, Data Service Provider: The DSP of china aviation is Aviation Data Communication Corporation(ADCC) + ADCC: VHF, 131.450MHz, China + ARINC: VHF/VDL Mode2/HF/Satellite, 131.550MHz, America + SITA: VHF/VDL Mode2/Satellite, 131.825MHz, Europe + AEROTHAI: VHF, 131.450MHz, Thailand + AVICOM: VHF, 131.550MHz, Japan + GLOBALINK: ARINC + ADCC + AEROTHAI
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