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Radar Expert Explains How To Cheaply Add Radar To Your Own Hardware Projects
szczys writes "Gregory Charvat has been playing with and teaching others about entry-level radar concepts for a long time. Now he's sat down and explained how you can do it yourself inexpensively. He says, 'One enabling technology for Radar was the cathode ray tube (CRT), which facilitated a method of measuring the time delay between transmitted and received waveforms. ... Today, rather than using a CRT we can use high-speed digitizers. This offers the obvious advantage of applying signal processing to acquired data so that only moving targets are detected, tracking can be achieved, imaging, and a multitude of other modes. But for hobbyist and consumer projects we do not need this much power, range, and can not afford the cost. We need the ability to sense like a long range radar (detecting only moving targets, imaging, Doppler, signatures, etc) but at short ranges and at low costs.' Charvat then proceeds to walk through several options for the amatuer hardware hacker."
Become the Radar Secret Service!
WITH RADAR!
I would like to be able to jam police radar guns with an overpowering signal.
I can see it now.
There you are innocently trying out your new homemade RADAR near the local airport. Your signals, as you bounce them off commercial airlines coming into land, are spotted quite easily by the tower and reported on to whomever controls security around the airport.
You hear the sound of the 777 you have your cantenna aimed at suddenly drowned out by the much louder sound of a military jet approaching, the twin snake of missile exhaust flashes for a split second from under the wings.....
News just in: Evil terrorist, planning to bomb a 777 and kill all passengers on board, killed by Air Force air to surface missile near JFK.
What tech do auto makers use for the proximity detectors in car bumpers?
Seems like that'd be an inexpensive, short range detector, even if it's not radar.
Obligatory link
Ezekiel 23:20
The new single-chip radar solutions and FMCW radar modules are definitely much easier to use and more capable than what was available just a few years ago, but DIY radar is nothing new. Amateur radio operators have been playing with radar guns and door sensors for decades, and doing some pretty interesting things with them. I remember reading photocopies of articles from QST from the 1970's that explained how to hack door sensors to make speed detectors, as well as using them for long-distance voice and video transmission with parabolic reflectors. People have also been playing with marine radar, which is considerably more expensive but still affordable for a dedicated experimenter.
I am a geek attorney, but not your geek attorney unless you've already retained me. This is not legal advice.
"amatuer hardware hacker.""
^^^^^^^^^^^
FFS does Beta not have a spell checker?
What is a CRT? It it pronounced like Kurt, or CeeeArrrrrTeeee? Do they come with any cool apps? I do like the idea of my own ray tube though. Sounds pretty up and coming. Anybody know of any upcoming IPOs investing in this tech?
Now if I can only find a shark...
Table-ized A.I.
amatuer hardware hacker
http://hackaday.com/
Since when has Hardware Engineering being incorrectly classed as "hacker"?
I cant stand it when the word "hack" is used by everyone, incorrectly, for everything. Its just insulting to their own intelligence.
I hacked my cup of coffee today, i added a sweetener instead of sugar, omg!......
Those are probably ultrasound. Ultrasound distance sensors are available at Radio Shack and included in Lego Mindstorm kits.
According the the Jargon File, the definitive dictionary of hacker terminology, the word "hacker" ORIGINALLY referred to radio experimenters who did things like make or modify radar units. Later, it was used to describe people doing similar hacks with computer systems.
According the the Jargon File, the definitive dictionary of hacker terminology, the word "hacker" ORIGINALLY referred to radio experimenters who did things like make or modify radar units. Later, it was used to describe people doing similar hacks with computer systems.
Google has the correct definition.
hacker
hak/Submit
noun
noun: hacker; plural noun: hackers
1. a person who uses computers to gain unauthorized access to data.
informal
an enthusiastic and skilful computer programmer or user.
2. a person or thing that hacks or cuts roughly.
But the cop has to be stationary to use LIDAR, which limits the places it can be deployed. Here in CA I slow down for those places. Also, my V1 will detect LIDAR backscatter from vehicles ahead. And my front plate is missing (please pull me over, if you can be bothered) so there is no good target to place the laser when I am approaching, so they have to setup (stationary, again) from the back just to find a flat spot on the car. In theory it works, in practice V1 beeps, I lift, and some tard next to me (soon to be ahead of me) eats the ticket. /shrug
Well, It's wrong. A Hacker originally was anybody who built or modified electronics
(not just Radar).
I know, I was there.........
I don't suppose you have any early text using the term? The jargon file itself is pretty old now. If you have a clear use of the term much earlier it could be of historical interest to many people.
Ozoner, would you say "I knew the original hacker. The original hacker was a friend of mine. Dan, you're no original hacker"? :)
For anybody who knows... could a radar system partly or completely side-step the Doppler Dilemma ( http://en.wikipedia.org/wiki/W... ) by doing DSS or FHSS and cycling through a sequence of different carrier frequencies from pulse to pulse?
Google finds content, it doesn't create content. Google found that definition somewhere, and we don't know where. Therefore citing Google is precisely the same thing as saying "some random web site says ..."
Additionally, jargon file is maybe 20-25 years older than Google, so for the _original_ meaning of a term jargon file trumps Google by a long shot.
Google finds content, it doesn't create content. Google found that definition somewhere, and we don't know where. Therefore citing Google is precisely the same thing as saying "some random web site says ..."
Additionally, jargon file is maybe 20-25 years older than Google, so for the _original_ meaning of a term jargon file trumps Google by a long shot.
If Google cant find your "Jargon File", how the hell will i ever find it? lol
Please, for the love of God, link this "Jargon File" and prove me wrong :)
When I search, the first 15 Google results for Jargon file are correct. The third one is the entry for "hacker", which is interesting. In case your Google is broken, the primary copy is http://www.carb.org/jargon/
Have you seen the xkcd about diet Coke and Mentos? It kind of expresses how I feel right now, getting the honor of introducing you to a classic bit of geekdom. Sergey and Larry almost surely would have read the Jargon File when they were in college.
My post has a typo. That should be http://www.catb.org/jargon/
Catb is Eric S. Raymond's page. If you're not familiar with ESR yet, he's pretty awesome. I highly recommend two of his essays, "How to Ask Questions the Smart Way" and "the Cathedral and the Bazaar".