cyprio7 said:... i dont want to by a big hand held global positioning system... i want very small.. ideally match box size...(that i can integrate into my own system) that can triangulate where a signal is coming from and its distance..... why cant i use RF to triangulate if i use a clock speed in like the Mhz or GHz range is it stil impossible....? is there any other methods/types of signal other than ultrasonic that would allow me to triangulate? how bout audio frequency.. but like at 22khz or something (or even possible very low audio frequency that we cant hear)..... like which is just outside of human hearing so that humans cant hear it..... but then u can blast it really loud and it wont bother ppl... do u think this is possible?
cyprio7 said:the accuracy doesnt have to be spot on.... ideally id like the recievers to be as close together as possible so i can fit it into something handheld and small.. i dont want it to be bulky... recievers probably alligned to a few millimetres accuracy
and as for how accurate i want it to be and dimensions........
in terms of size of the area id say... a field about the length of a average/small sized football pitch, and its width is double the width of a average/small football pitch. given these rough dimensions, id like to know the *approximate* direction.. mayybe accurate to 45degres of where the transmitter is given the approximate size of the football pitch. ..altho of course greater accuracy will be much better but id say 45degres is minimum.
also, do u think what i said about using a high audio frequency that humans cant hear to triangulate from minimum 20m ish away is feasable? obviously greater distance the better.. but id say about 15-20metres is absolutely minimum. and like i said ideally id like the recievers to be as close as possible.. to give me the desired kind of accuracy as i described above. what ya recon? is it feasable?
cyprio7 said:to be honest i dont mind too much about distance...getting the distance reading doesnt matter to me for now.... my main goal is to soley calculate the approximate direction to about 45degrees resolution..with as minimum spaceing as possible between the recievers... is it possible to do that with small spacing? the signal will cover 1mm in 3uS theoretically... which means 3MHz... but obviously the clock must be faster than 3Mhz for accuracy purposes.
ideally i wouldnt want the recievers to be spaced more than 10cm apart. so given that i only want to calculate approx direction... do u think this is possible with small distance? i think its theoretically possible, however, i dont have as much experience as you when it comes down to actually doing these things in practice and whether it is feasable in practice is a different story..
cyprio7 said:nigel could you please tell me a bit more about the ferrite rod aerial method of measuring the strength please and how it finds the direction
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