AIS: AIS receiver on a Raspberry Pi with RTL-SDR
Sumber: https://www.fontenay-ronan.fr/ais-receiver-on-a-raspberry-pi-with-rtl-sdr/
The automatic identification system (AIS) is an automatic tracking system that uses transponders on ships and is used by vessel traffic services (VTS). AIS information supplements marine radar, which continues to be the primary method of collision avoidance for water transport.
1. System update
sudo apt-get update sudo apt-get upgrade 1 2
sudo apt-get update sudo apt-get upgrade
2. RTL-SDR software installation
Install required software for compilation : sudo apt-get install git cmake libusb-1.0-0-dev build-essential 1
sudo apt-get install git cmake libusb-1.0-0-dev build-essential
Clone software from Github : git clone git://git.osmocom.org/rtl-sdr.git 1
git clone git://git.osmocom.org/rtl-sdr.git
Move to folder, compile, install and reboot : cd rtl-sdr mkdir build cd build cmake ../ -DINSTALL_UDEV_RULES=ON make sudo make install sudo ldconfig cd ~ sudo cp ./rtl-sdr/rtl-sdr.rules /etc/udev/rules.d/ sudo reboot 1 2 3 4 5 6 7 8 9 10
cd rtl-sdr mkdir build cd build cmake ../ -DINSTALL_UDEV_RULES=ON make sudo make install sudo ldconfig cd ~ sudo cp ./rtl-sdr/rtl-sdr.rules /etc/udev/rules.d/ sudo reboot
Then we can test : rtl_test 1
rtl_test
You might have the following issue :
Found 1 device(s): 0: Realtek, RTL2838UHIDIR, SN: 00000001
Using device 0: Generic RTL2832U OEM
Kernel driver is active, or device is claimed by second instance of librtlsdr. In the first case, please either detach or blacklist the kernel module (dvb_usb_rtl28xxu), or enable automatic detaching at compile time.
usb_claim_interface error -6 Failed to open rtlsdr device #0.
Remove the problematic driver : sudo modprobe -r dvb_usb_rtl28xxu 1
sudo modprobe -r dvb_usb_rtl28xxu
Blacklist it by creating the following file : sudo vi /etc/modprobe.d/rtl-sdr-blacklist.conf 1
sudo vi /etc/modprobe.d/rtl-sdr-blacklist.conf
With the following content : blacklist dvb_usb_rtl28xxu 1
blacklist dvb_usb_rtl28xxu
Then we can test again : rtl_test 1
rtl_test
The output should looks like :
Found 1 device(s): 0: Realtek, RTL2838UHIDIR, SN: 00000001
Using device 0: Generic RTL2832U OEM Found Rafael Micro R820T tuner Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6 [R82XX] PLL not locked! Sampling at 2048000 S/s.
Info: This tool will continuously read from the device, and report if samples get lost. If you observe no further output, everything is fine.
Reading samples in async mode… Allocating 15 zero-copy buffers
3. RTL-SDR dongle calibration
Go back to your home folder : cd ~ 1
cd ~
Install required software for compilation : sudo apt install build-essential libtool automake autoconf librtlsdr-dev libfftw3-dev 1
sudo apt install build-essential libtool automake autoconf librtlsdr-dev libfftw3-dev
Clone software from Github : git clone https://github.com/steve-m/kalibrate-rtl 1
git clone https://github.com/steve-m/kalibrate-rtl
Move to folder, compile and install : cd kalibrate-rtl/ ./bootstrap && CXXFLAGS='-W -Wall -O3' ./configure make sudo make install 1 2 3 4 5
cd kalibrate-rtl/ ./bootstrap && CXXFLAGS='-W -Wall -O3' ./configure make sudo make install
Test it a few minutes to get a rough idea of the PPM deviation : rtl_test -p 1
rtl_test -p
Output :
Found 1 device(s): 0: Realtek, RTL2838UHIDIR, SN: 00000001
Using device 0: Generic RTL2832U OEM Found Rafael Micro R820T tuner Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6 [R82XX] PLL not locked! Sampling at 2048000 S/s. Reporting PPM error measurement every 10 seconds… Press ^C after a few minutes. Reading samples in async mode… lost at least 168 bytes real sample rate: 2047684 current PPM: -154 cumulative PPM: -154 real sample rate: 2048101 current PPM: 50 cumulative PPM: -52 real sample rate: 2048077 current PPM: 38 cumulative PPM: -22 real sample rate: 2048198 current PPM: 97 cumulative PPM: 8 real sample rate: 2048066 current PPM: 33 cumulative PPM: 13 real sample rate: 2048093 current PPM: 46 cumulative PPM: 18 real sample rate: 2048072 current PPM: 36 cumulative PPM: 21 real sample rate: 2047986 current PPM: -6 cumulative PPM: 17 real sample rate: 2048079 current PPM: 39 cumulative PPM: 20 real sample rate: 2048108 current PPM: 53 cumulative PPM: 23 real sample rate: 2048037 current PPM: 18 cumulative PPM: 23 ^CSignal caught, exiting!
User cancel, exiting… Samples per million lost (minimum): 0
We’ll keep 23 as a rough PPM value at this stage.
Start to search for 900Mhz GSM stations : kal -s 900 -g 49.6 -e 23 1
kal -s 900 -g 49.6 -e 23
Output :
Found 1 device(s): 0: Generic RTL2832U OEM
Using device 0: Generic RTL2832U OEM Found Rafael Micro R820T tuner Exact sample rate is: 270833.002142 Hz [R82XX] PLL not locked! Setting gain: 49.6 dB kal: Scanning for GSM-900 base stations. GSM-900: chan: 2 (935.4MHz – 16.587kHz) power: 869529.54 chan: 4 (935.8MHz + 38.960kHz) power: 2190452.67 chan: 5 (936.0MHz – 16.799kHz) power: 4623109.31 chan: 15 (938.0MHz + 38.865kHz) power: 815597.24 chan: 16 (938.2MHz – 15.502kHz) power: 2225985.25 chan: 20 (939.0MHz + 38.956kHz) power: 1047025.60 chan: 78 (950.6MHz – 12.733kHz) power: 3137623.08 chan: 123 (959.6MHz – 12.483kHz) power: 1856407.90
Then let’s find the PPM using here the channel 5 (as it is the stronger) : kal -c 5 -g 49.6 -e 23 1
kal -c 5 -g 49.6 -e 23
Output :
Found 1 device(s): 0: Generic RTL2832U OEM
Using device 0: Generic RTL2832U OEM Found Rafael Micro R820T tuner Exact sample rate is: 270833.002142 Hz [R82XX] PLL not locked! Setting gain: 49.6 dB kal: Calculating clock frequency offset. Using GSM-900 channel 5 (936.0MHz) average [min, max] (range, stddev) – 11.901kHz [-11934, -11871] (63, 18.615683) overruns: 0 not found: 0 average absolute error: 35.715 ppm
Our average absolute error is 35.715 ppm ! 4. RTL-AIS Software
Go back to your home folder : cd ~ 1
cd ~
Clone software from Github : git clone https://github.com/dgiardini/rtl-ais 1
git clone https://github.com/dgiardini/rtl-ais
Move to folder, compile and install : cd rtl-ais make 1 2
cd rtl-ais make
Then we can run the software : ./rtl_ais -p 35 -n -h 192.168.1.15 1
./rtl_ais -p 35 -n -h 192.168.1.15
-p 35 : Software deviation in PPM found during the previous calibration. -n : Log AIS messages to console. -h : Send AIS data to the mentioned IP. Here, our desktop computer with OpenCPN.
Output :
Edge tuning disabled. DC filter enabled. RTL AGC disabled. Internal AIS decoder enabled. Buffer size: 163.84 mS Downsample factor: 64 Low pass: 25000 Hz Output: 48000 Hz Found 1 device(s): 0: Realtek, RTL2838UHIDIR, SN: 00000001
Using device 0: Generic RTL2832U OEM Found Rafael Micro R820T tuner Log NMEA sentences to console ON AIS data will be sent to 192.168.1.15 port 10110 Tuner gain set to automatic. Tuner error set to 35 ppm. Tuned to 162000000 Hz. Sampling at 1600000 S/s. !AIVDM,1,1,,B,6>jCJckfJjOt>db70104@00,0*71 !AIVDM,1,1,,B,E>jCJcl32bh87ab@87a:1RP0000?rnLv=Q?ih50b>:0,0*6A !AIVDM,1,1,,B,6>jCJckfJjOt>db7@104@00,0*01 !AIVDM,1,1,,A,6>jCJckfJjOt>db70104@00,0*72 !AIVDM,1,1,,B,E>jCJcl32bh87ab@87a:1RP0000?rnLn=Q?j@50b>:0,0*59 !AIVDM,1,1,,B,6>jCJckfJjOt>db70104@00,0*71 !AIVDM,1,1,,A,6>jCJckfJjOt>db5P104@00,0*10 !AIVDM,1,1,,B,E>jCJcl32bh87ab@87a:1RP0000?rnM4=Q?ih50b>:0,0*29 !AIVDM,1,1,,B,E>jCJcl32bh87ab@87a:1RP0000?rnLv=Q?gh50b>:0,0*64 !AIVDM,1,1,,B,E>jCJcl32bh87ab@87a:1RP0000?rnLm=Q?k050b>:0,0*2B !AIVDM,1,1,,B,6>jCJckfJjOt>db70104@00,0*71 !AIVDM,1,1,,A,33IWVk0Ohvwma3BK1nlAIQ@L01vP,0*64 !AIVDM,1,1,,B,33IWVk0Ohrwma5vK1o2QRQFV00qh,0*27 !AIVDM,1,1,,A,13IWVk0Ohrwma74K1o;iS1Hd0L10,0*6E !AIVDM,1,1,,B,33IWVk000bwmabjK1pdC8jBj01r0,0*33 !AIVDM,1,1,,B,E>jCJcl32bh87ab@87a:1RP0000?rnLk=Q?ih50b>:0,0*77 !AIVDM,1,1,,A,13IWVk000IwmbLnK1qS8;h6d08jCJckfJjOt>db6h104@00,0*28 !AIVDM,1,1,,B,33IWVk0Oh5wmbIJK1qALP@l:01o@,0*31 !AIVDM,1,1,,A,33IWVk0Oh7wmbI8K1qBdEPnB00pP,0*18 !AIVDM,1,1,,B,13IWVk0Oh6wmbHVK1qCdQhpJ087:,0*69 !AIVDM,1,1,,B,33IWVk0Oh7wmbHHK1qEdDPpT013@,0*36 !AIVDM,1,1,,A,13IWVk0Oh7wmbH0K1qFt00rd05C0,0*7E !AIVDM,1,1,,A,33IWVk0Oh8wmbGJK1qHch0rr00ih,0*26 !AIVDM,1,1,,B,13IWVk1009wmbG:K1qJ;g0s005C0,0*11 !AIVDM,1,1,,A,13IWVk1008wmbFRK1qLKl@wB0<10,0*7A !AIVDM,1,1,,B,13IWVk1Oh6wmbDPK1qTu0QjCJckfJjOt>db5P104@00,0*10 !AIVDM,1,1,,B,13IWVk1Oh4wmbCnK1qadqQE000R@,0*3A !AIVDM,1,1,,A,13IWVk1Oh3wmbCrK1qcM0iGB08Gw,0*2A !AIVDM,1,1,,B,13IWVk1Oh3wmbD6K1qeP@1KV05C4,0*0B !AIVDM,1,1,,A,13IWVk1003wmbChK1qh=jCJcl32bh87ab@87a:1RP0000?rnLq=Q?gh50b>:0,0*63 !AIVDM,1,1,,A,33IWVk1003wmbCFK1qlej1Rd0AfJ,0*48 !AIVDM,1,1,,A,13IWVk1003wmbCFK1qp@:1WB0000,0*5D !AIVDM,1,1,,A,13IWVk1Oh1wmbCJK1qru21f40000,0*0C !AIVDM,1,1,,B,33IWVk1001wmbBLK1qsnP1v80Dhr,0*27 !AIVDM,1,1,,A,33IWVk1000wmbCDK1qeoHAp20EjCJcl32bh87ab@87a:1RP0000?rnLq=Q?j@50b>:0,0*46 !AIVDM,1,1,,B,6>jCJckfJjOt>db70104@00,0*71 !AIVDM,1,1,,A,E>jCJcl32bh87ab@87a:1RP0000?rnLi=Q?j@50`b>:0,0*5D !AIVDM,1,1,,A,6>jCJckfJjOt>db70104@00,0*72 !AIVDM,1,1,,B,6>jCJckfJjOt>db5h104@00,0*2B
This messages could be decoded online, for example here : http://ais.tbsalling.dk/ 5. OpenCPN client
Here is my configuration: – 192.168.1.12 : Raspberry Pi Zero with RTL-SDR dongle – 192.168.1.15 : Laptop with Ubuntu desktop and OpenCPN software
Desktop OpenCPN configuration :
Using the debug window, we can check that AIS messages are well received by OpenCPN :
And AIS targets are shown on the map :
All done !