FPGA ADS-B Demodulator and Frequency Estimator

This is a research project that was submitted as an Honours Thesis to Flinders University, South Australia. If you wish to use or extend this project, please contact myself or -- if you are a student -- contact my supervisors from the College of Science and Engineering.

Demodulates and estimates the carrier frequency of ADS-B messages.

Building the Project

This project is based on the ADRV9364Z7020 HDL Project.

First, checkout HDL reference design in the directory above.

cd ~/src/ # Assume a source working directory exists.
git clone git@github.com:analogdevicesinc/hdl.git
git checkout 2023_R2_p1
cd hdl/
cd projects/adrv9364z7020/
source /opt/Xilinx/Vivado/2023.2/settings64.sh
make

Then build the ADS-B project.

cd ~/src/
git clone git@github.com:bezborodow/adsb.git
cd adsb/
cd adrv9364z7020_adsb/
make

Building BOOT.BIN

Get ELF from bootgen_sysfiles.tgz on BOOT partition of Kuiper Linux. The file u-boot_zynq_adrv9361.elf is in the tar archive.

After generating the bitstream, do File -> Export -> Export Hardware. This will export the system_top.xsa. Be sure to check 'Include Bitstream'.

Under wiki-scripts:

cd ~/src/adsb/
find . -name system_top.xsa
cd ~/src/
git clone git@github.com:analogdevicesinc/wiki-scripts.git
cd wiki-scripts/
cd zynq_boot_bin/
mkdir -p adrv_lvds/
source /opt/Xilinx/Vivado/2023.2/settings64.sh
./build_boot_bin.sh \
    ~/src/adsb/adrv9364z7020_adsb/system_top.xsa \
    adrv_lvds/u-boot_zynq_adrv9361.elf

Connecting over UART

dmesg -w
screen /dev/ttyUSB1 115200

Setting Carrier and Sampling Frequencies

iio_attr -c ad9361-phy voltage0 sampling_frequency 60000000
iio_attr -c ad9361-phy altvoltage0 frequency 1091000000

Running Vunit Testbenches

./generate_vunit_data
./vunit

Connecting to the SDR over Ethernet.

On the SDR (over UART):

ip addr add 192.168.2.2/24 dev eth0
ip link set eth0 up
ip addr show eth0
ip route add default via 192.168.2.1

On the PC host, plug in the cable, then:

dmesg -w

Ensure the correct adapter name is used. For example, if it is enp2s0 then:

sudo ip addr add 192.168.2.1/24 dev enp2s0
sudo ip link set enp2s0 up
ip addr show enp2s0
ping 192.168.2.2
ssh-copy-id root@192.168.2.2
ssh root@192.168.2.2

Check what is your default route:

ip route | grep default

If it is wlp5s0, then:

sudo iptables -t nat -A POSTROUTING -o wlp5s0 -j MASQUERADE
sudo iptables -A FORWARD -i wlp5s0 -o enp2s0 -m state --state RELATED,ESTABLISHED -j ACCEPT
sudo iptables -A FORWARD -i enp2s0 -o wlp5s0 -j ACCEPT