Does anyone know the details of the White-Powell Algorithm? It is used in Radar Scan Convertors.?
359228
Yes it is used in radar scan converters.\nFor more details - http://www.cwcembedded.com/products/0/4/356.html
691515
algorithms, data structures, computer organization
390325
Technically, no, there isn't any web site which offers truly delay-free radar imagery. This is because Doppler radar takes time (5 minutes in clear-air mode, 3 in severe weather mode) to pan the horizon. It's a mechanical device, with a narrow field of view, so it must rotate in order to complete each image. However, there are web sites which update their radar imagery in real-time, as the image is relayed. The one I tend to use is www.weathertap.com, an excellent and well-regarded site for and by severe weather experts. It's a premium site, but for $4/month, you get real-time Doppler feeds with movable zoom, and all possible products (including multi-tilt storm relative velocity, radial velocity, echo tops, VAD, vertically integrated liquid, everything). You also get extremely high res visible sat imagery (to 1-km), lightning data, and (a boon to aviation people) aviation weather products with official route briefings and a link to DTC DUATS. Clearly, this is not necessarily the site for civilians and it has a steep learning curve, but it is the best available.
830779
Yes. All modern moving radars are capable of obtaining an accurate reading. How it works is this: a dopler radar sends a radar wave to a target, when the wave bounces from the target, it returns to the antenna and the speed is detected through a change in the frequency of the wave. When the police cruiser is moving, the radar wave bounces off stationary objects, ie. road, tree, guardrail etc. This speed is checked with the speedometer's speed visually by the officer. When a target comes through the radar field, the frequency change will be much higher. The radar subtracts the cruiser's speed and the target speed is displayed. The officer (in FL) has to make an idependent observation on the target vehicle prior to using the radar's speed. I have written only 3000 radar tickets and only two were ever contested. This was because I only stopped those going 15 MPH over the speed limit. If the violator had a good attitude, I would only charge the driver with going 9 over the speed limit. This would save him or her approx. $100.00.
520825
Sorry but the model TI-83 is an outdated tool, that was used by the Aertms generation, six centuries ago.  This model could only perform 2,000 logic calculations per second.  In this age that is pathetic.  I am sorry all knowledge that is more then 2 centuries old has been deleted from my memory banks.
334220
The Viterbi algorithm is a dynamic programming algorithm for finding the most likely sequence of hidden states – known as the Viterbi path – that result in a sequence of observed events, especially in the context of hidden Markov models. The forward algorithm is a closely related algorithm for computing the probability of a sequence of observed events. These algorithms form a subset of information theory.\n\nHere's an example:\n\nAssume you have a friend who lives far away and whom you call daily to talk about what each of you did that day. Your friend has only three things he's interested in: walking in the park, shopping, and cleaning his apartment. The choice of what to do is determined exclusively by the weather on a given day. You have no definite information about the weather where your friend lives, but you know general trends. Based on what he tells you he did each day, you try to guess what the weather must have been like.\n\nYou believe that the weather operates as a discrete Markov chain. There are two states, "Rainy" and "Sunny", but you cannot observe them directly, that is, they are hidden from you. On each day, there is a certain chance that your friend will perform one of the following activities, depending on the weather: "walk", "shop", or "clean". Since your friend tells you about his activities, those are the observations. The entire system is that of a hidden Markov model (HMM).\n\nYou know the general weather trends in the area and you know what your friend likes to do on average. In other words, the parameters of the HMM are known. In fact, you can write them down in the Python programming language:\n\nstates = ('Rainy', 'Sunny')\n\nobservations = ('walk', 'shop', 'clean')\n\nstart_probability = {'Rainy': 0.6, 'Sunny': 0.4}\n\ntransition_probability = {\n   'Rainy' : {'Rainy': 0.7, 'Sunny': 0.3},\n   'Sunny' : {'Rainy': 0.4, 'Sunny': 0.6},\n   }\n\nemission_probability = {\n   'Rainy' : {'walk': 0.1, 'shop': 0.4, 'clean': 0.5},\n   'Sunny' : {'walk': 0.6, 'shop': 0.3, 'clean': 0.1},\n   }\n\nIn this fragment, start_probability refers to your uncertainty about which state the HMM is in when your friend first calls you (all you know is that it tends to be rainy on average). The particular probability distribution used here is not the equilibrium one, which is (given the transition probabilities) actually approximately {'Rainy': 0.571, 'Sunny': 0.429}. The transition_probability refers to the change of the weather in the underlying Markov chain. In this example, there is only a 30% chance that tomorrow will be sunny if today is rainy. The emission_probability tells you how likely your friend is to perform a certain activity on each day. If it's rainy, there is a 50% chance that he is cleaning his apartment; if it's sunny, there is a 60% chance that he will go outside for a walk.\n\nYou talk to your friend three days in a row and discover that on the first day he went for a walk, on the second day he went shopping, and on the third day he cleaned his apartment. You have two questions: What is the overall probability of this sequence of observations? And what is the most likely sequence of rainy/sunny days that would explain these observations? The first question is answered by the forward algorithm; the second question is answered by the Viterbi algorithm. These two algorithms are structurally so similar (in fact, they are both instances of the same abstract algorithm) that they can be implemented in a single function:\n\ndef forward_viterbi(y, X, sp, tp, ep):\n   T = {}\n   for state in X:\n       ##          prob.      V. path  V. prob.\n       T[state] = (sp[state], [state], sp[state])\n   for output in y:\n       U = {}\n       for next_state in X:\n
396626
Radio Detection And Ranging
319998
http://www.math.iitb.ac.in/resources/manuals/algorithms.html click d link to know. It may be helpful to u.
320485
What kind of detector?
60148
Walsh codes are generated from a Hadamard matrix. Try this link:  http://mathworld.wolfram.com/WalshFunction.html\n\nFor more info on cell phone application, see page 552, Peterson, Ziemer, and Borth, "Introduction to Spread Spectrum Communications", ISBN 0-02-431623-7
804076
Yes. And here you have some online scaners:\nhttp://askcomputerexpert.ws43.com/download
984768
Not only do they search for radio signals, but they search for patterns or data within the signals.\n\nThis is accomplished with many listening stations and some distributed resource calculations.  They get volunteers to run some of the code on home PCs.\n\nThe code executes a Fast Fourier Transform and converts the raw signal into frequencies.  Noise is quickly discernible from a signal.  Then it has to be proved that this was not from a terrestrial source of from a man-made satellite.\n\nSo far no luck.
221681
WHY DO PEOPLE MENTION THE SPEED OF LIGHT OR FREQUENCY SHIFT OR THE WORD DOPPLER FOR DISTANCE FINDING THEY HAVE NOTHING TO DO WITH RADAR DISTANCE MEASURING.\n\nDOPPLER IS USED TO MEASURE SPEED OF VEHICLES , BASEBALLS ETC. OR DETECT MOTION LIKE THE MOTION IN CLOUDS, TORNADOS, HURRICANES OR THE MOTION OF AIRCRAFT IT IS USED TO DETECT MOVEMENT . \n\nIN DISTANCE MEASURING A MAGNATRON TRANSMITTER TUBE EMITS A SIGNAL DOWN A WAVEGUIDE. A HOLLOW SQUARE COPPER TUBE , IT GOES TO A ELECTRONIC LENS TO A PARABOLIC ANTENNA.  THE SIGNAL TRAVELS THROUGH THE AIR, HITS THE TARGET, BOUNCES OFF, AFTER TRANSMITTING THE RADAR SET GOES INTO RECEIVING,  THE RETURNING SIGNAL HITS THE PARABOLIC ANTENNA IS FOCUSED INTO THE WAVEGUIDE AND TRAVELS BACK TO THE RADAR SET.  THE TIME IT TAKES FOR THE SIGNAL TO RETURN IS HOW FAR THE TARGET IS AWAY FROM THE RADAR ANTENNA!  THE FURTHER AWAY THE LONGER IT TAKES FOR THE SIGNAL TO RETURN.  IT IS NEAR THE SPEED OF LIGHT BUT NOT THE SPEED OF LIGHT!\n\n\nFAR AWAY TARGETS REQUIRE PULSES AT A SLOWER RATE THAN WHEN THE TARGET IS UP CLOSE, UP CLOSE THE PULSE RATE OF THE TRANSMITTER IS QUITE RAPID!  HIGH POWER SEARCH RADAR MIGHT HAVE A PULSE RATE OF 60 PULSES A SECOND FOR LONG RANGE SCAN, WHILE A CLOSE IN RATE CAN RUN OVER 1000 PULSES PER SECOND WHEN AN AIRCRAFT APPROACHES A SHIP TOO CLOSE! \n\nJUST BASED ON THE SPEED THAT RADIO WAVES TRAVEL IN THE ATMOSPHERE, HOW FAR THEY WILL TRAVEL IN SO MANY ZILLIONTHS OF A SECOND!\n\nEARLY RADAR USED ONLY AN OSCILLOSCOPE STRAIGHT LINE WITH A STRAIGHT LINE ON THE LEFT BEING THE TRANSMITTED PULSE AND THE RETURN(S) BEING BUMPS OUT TO THE RIGHT THE DISTANCE BEING THE MEASUREMENT FROM LEFT TO RIGHT! AND THERE WERE MECHANICAL METERS THAT SHOWED WHERE THE ANTENNA WAS AIMED!\n\nTHE RADAR USED IN HAWAII WHEN WE WERE BOMBED BY THE JAPANEESE AT THE BEGINNING OF WW2 WAS THIS TYPE OF DISPLAY!\n\nSO MUCH FOR HISTORY !\n\nHAVE A GOOD DAY.\n\nAPS
437960
why not try Danube's Enigma, it is easy and fulfills the requirements of all matlab projects!\n:)
1050743
A radar that is based in space!
805688
U can use either Kruskal's algorithm or prims algorithm. More information about these algorithm u can find on internet.\n\nPrims algorithm is based on adjacency matrix.
214158
Well in some cases yes, in others, no. In the USA the three main Ka frequencies are 33.8(MPH industries) 34.7(Stalker Radar) and 35.5(Talon and Dectuar radar). And some of these guns are used in some other countries as well. In some europe countries they use Ku-band(13.400 GHz ± 25 MHz) radar guns which some american radar detectors detect\n\nIn many areas besides the US there are fixed cameras used which use 34.3 MHz which is extremely hard to detecto unless a radar detector is tuned into that frequencies. That is why you might not be able to use an american bought radar detector in another country. However there are some that that you can purchase to use every where, like the BEL 990 internation, BEL v995 international, BEL rx65 (in international mode), BEL 975r, or Valentine 1\n\nI found one website that might help you understand the different frequencies used for radar.\nhttp://copradar.com/preview/xappA/xappA.html