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15/10/2020 7PM

POLICE ARE USING TEARGAS AND WATER CANNONS AGAINST PEACEFUL, UNARMED PROTESTERS.

THIS IS WHAT THEY ARE DOING TO US. I’M FUCKING ANGRY THAT I CAN ONLY SIT HERE AND UPDATE SHIT.

We are unarmed. We have only our umbrellas.

A monk in the protest literally prayed and begged the police to stop. 

Dozens of people are injured from the water cannon.

My friends are freaking there. And I’ve lost contact with them. The last text I sent was to go to our campus because it is safer there.

I’m so angry. Dear international followers, please acknowledge and please boost this post.

This began because the Future Forward Party, a political group pushing for democratic reform, was forcefully disbanded by the unjust court.

Currently, two protesters face life imprisonment and >50 more have been arrested since the start of these protests.

You could do a sane thing and record the signal strength in every direction with a directional antenna (DA) system. DAs are things like dishes and Yagi antennas that attempt to pick up radio signals in a very specific direction or just a small cone. To get the signals in every direction with a DA, you might have a spinning dish, or a fixed circular array of outward-pointing Yagi.

Below: a Yagi-Uda antenna.

You might even be able to make a wide array of unidirectional recievers and count the phase shift differences/Time difference of arrival (TDoA) of the radio wave to determine the relative distance between your recievers. This gives you a “fix” (set of coordinates) of the possibile locations the reciver is at.

You could also do multiple directional antenna arrays with TDoA and boost that accuracy.

Or…

Or you could go balls to the wall insane witht this bad boy. We call him the doppler antenna.

The diagram shows it all, and if you’re aware of the doppler effect, it should make sense.

The antenna swings towards the transmitter, and the signal gets faster. Swing the antenna away, and the signal gets slower. This instead converts your problem from an amplitude modulation problem to a frequency modulation problem. However, there is one teeny tiny catch:

To get a useful doppler effect, we have to swing this motherfucker at 20,000 rpm. That’s fucking fast, even for F1 racing engines, which glow red hot at that speed. Normal cars can usually go 7000 rpm max. Just think about that. Nobody in their right fucking mind would do this. It’s really hard to swing an off-center metal bar at 20,000 rpm without putting yourself at risk of launching a metal beam in a random direction at twice the speed of sound.

Fortunately, there’s another way, and it’s really clever. I’d like you to meet a pseudo-doppler array. I hope you don’t find it as inexplicably terrifying as I do.

Here we have a large circle of antennas, and we use electronics and fast clocks to only take input from one antenna at a time, and that antenna is always moving around the circle. Therefore it’s like the receiving antenna moves around in a circle really fast, but we don’t have moving parts. Cool huh?

I thought so too.

breadsticks:

Of bread.