Mystery Signal from a Helicopter Filming a Police Chase
Self-taught signals and electronics hacker, Oona Räisänen was watching a raw clip from a news helicopter capturing a police chase. She noticed an interference in the audio, which turned out to be a mysterious digital signal. What she discovers is really quite interesting!
What could it be? Location telemetry from the helicopter? Information about the camera direction? Video timestamps?
The first guess seems to be correct. It is supported by the relationship of two of the three byte groups. If the 4 first bits of each byte are ignored, the data forms a smooth gradient of three-digit numbers in base-10. When plotted parametrically, they form an intriguing winding curve. It is very similar to this plot (see above) of the car’s position (blue, yellow) along with viewing angles from the helicopter (green), derived from the video by magical image analysis (only the first few minutes shown)….
8-6-2021 (August 6, 2021) is the Snakiest day of the year and it’s also this year’s CircuitPython Day! The day highlights all things CircuitPython and Python on Hardware. See you there!
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.