Radar Definition and 156 Threads

Hi, Has anyone tried using the HFSS software to get the extinction cross section of a particle? I've been told that the extinction cross section of a particle is the imaginary part of the radar cross section in forward direction, so I did exactly what the RCS tutorial from HFSS did, except...

can anyone please explain me matched filter in detail ? my understanding is as follows ( in case of a radar). u transmit a signal and during reception have a filter in ur receiver which continously checks in the received echoes whether the echo has the same shape of the transmitted pulse. is...

Well here are a couple of things I would like to know. Thanks in advance! how to build a Frequency-Modulated Radar gun. or how to build a Frequency-Modulated transmitter and reciever or where i can get either of these :D Thanks again!

Can anyone tell me what frequency and Wavelength Radar and Sonar work in. I think Radar have a frequency of 300giga hertz (UHF), wavelength 0.1 Sonar is somewhere between wavelength 100k - 10k metres, frequency 3k - 30k hertz. Please help me thanks,

I am trying to write a program to numerically calculate RCS using geometrical optics (or some form of it). Basically my idea was to cast a bunch of rays from an emitting object (in my code it is a 1 m^2 plate), find where they intersect a surface, reflect the rays off of this surface and see if...

Homework Statement A plane flying at a constant velocity v (parallel to x-axis) at a height h = 8 km is being tracked by a radar located at origin. if the angle A is decreasing at the rate of 0.025 rad/s, the velocity of the plane when A = 60 degrees is: (A is the angle made by the...

what is the physics behind radar

Hi all Is it possible that a RADAR speed camera, (the type that bounces off the road and is reflected off the vehicle and then the doppler shift represents the vehicle speed) can be affected by a raise in surface temperatue on a very hot day(40 degrees C plus, poster is in Australia) I...

I understand the theory of radar but not aviation radar. It is my understanding they can find an objects position in the x, y, and z axis simultaneously. How does that work?

Hey guys, I'm a first timer here, and need just easy pieces of advice. I'm pretty into cars and have a decent electrical knowledge behind my mechanical know how, just not with reading schematics. Recently, my 12V socket died and I finally have an excuse to hardwire my Escort Passport...

If I bought a radar gun, a radar detector, and three egg slicers, should I be able to demonstrate the three polarizer crossed polarization tricks? TIA, Jim Graber

Hi, This is my first post but I've perused the forums often enough before (usually while I should be studying instead!). I'm 26 and in my second year of a 4 year Electrical Engineering degree (late starter). I am currently intrigued by radar and how to engineer machines to detect and track an...

I was given a set of I/Q data points by my professor and asked to find the range of the target. How would one approach such a problem?

Homework Statement A stationary radar operator determines that a ship is 12 km south of him. An hour later the same ship is 10 km southeast. If the ship moved at constant speed and always in the same direction, what was its velocity during this time? This is so easy but I am just so...

Homework Statement You are in charge of calibrating the radar guns for a local police department. One such device emits microwaves at a frequency of 2.15 GHz. During the trials, these waves are reflected from a car moving directly away from the stationary emitter. You detect a frequency...

Hello All, I have been challenged by a friend to look into Gravitational waves and some questions he has about them -- but I have always been a slow starter. Took physics with SR in college, got my BSEE, happily can build analog circuitry of all kinds -- but found that certain questions about...

beamwidth = 60(lamda) / area i knw lamda = c x f how do i find the area ? and also what is c and f in relation to radar?

how do you make a ultrasonic radar to use on a computer? help please

Q) a plane is flying horizontally at an altitude of 1.5 miles and a speed of 400 mph. it is on a linear path that will take it directly over a radar station. find the rate at which the distance from the plane to the radar station is changing when the plane is exactly 2.5 miles from the station...

Homework Statement A radar beam has a wavelength of .02 m. The frequency is 17500 Hz. What would be its echo frequency if a rocket 60km away is moving at 500m/s and the radar is coming from a jet moving at 310m/s towards the rocket which is aimed at it? (b) Would the rocket appear red shifted...

I have a strange mystery. My house sings! I am wondering if anyone can take a guess at what could cause this. I have occasional insomnia, which leaves me lying there in bed in the wee hours of the night when it is dead silent. Well, this morning was one of those. I woke up around 1:00 am...

Homework Statement A radar antenna is tracking a satellite orbiting the earth. At a certain time, the radar screen shows the satellite to be 162 km away. The radar antenna is pointing upward at an angle of 62.3 degrees from the ground. Find the x and y component(in km) of the position of...

What damage to the body can infrared rays, radar waves, FM waves, TV waves, "shortwav What damage to the body can infrared rays, radar waves, FM waves, TV waves, "shortwave" waves, and AM waves do? I have to do a physics project on causes of cancer, based on a physics standpoint. I have an...

Homework Statement A radar transmitter used to measure the speed of pitched baseballs emits pulses of 2.0cm wavelength that are .25micros in duration. (a) what is the length of the wave packet produced? (b)to what frequency should the receiver be tuned? (c) What must be the minimum...

Holy smokes, just when we needed it, http://arxiv.org/PS_cache/arxiv/pdf/0805/0805.2197v1.pdf" is the latest paper hot off the press from Lewis, Francis, Barnes, Kwan & James, "Cosmological Radar Ranging in an Expanding Universe." This is mandatory reading for everyone interested in expanding...

Homework Statement A radar at rest emits microwaves at a frequency of 1.63 GHz onto a truck moving away from the radar. There is a frequency difference between the received and sent frequencies of 281 Hz. What is the velocity of the truck? Homework Equations f(obs)=f(sent)*[(v+/-observer...

Hi guys I hope I'm in the right subforum. I was thinking of a way to map a house or outside area with radar or some other method, and then using that info to create a map for a game. So my question is, what are the different methods available for sensing the surrounding area and creating a...

Hi I am designing a ultrasonic range finder. I am part of design group with the challenge of building a robot that can find its way through a known course. I found some circuits avaliable on the net. There is a section on the transmitter circuitry that confuses me. I am using microcontroller...

hi, I'm working on bistatic radar as part of my final year project. i'm using MATLAB software to implement my design and have a small problem in assuming bistatic RCS.. i got the formula from a book but the derivation was omited. any help in this area or anything related to bistatic radar...

I am in high school and I am doing an altrasonic circuit for my MITES project. I am using this schematic for it, but I read a lot of complaints about it on this website so I was woundering if there was a better one I could use. This is the one I am using...

I'm new to this forum, and I'm a Computer Engineer who recently have a lot of passion for circuits. Can anyone help me with a Ultrasonic Radar with can be worked in unison with my Computer to detect any movement. Thankyou all for helping me in advance

Homework Statement A towed - array sonar comprises 100 transducers equally spaced at every 3m and towed behind a ship so the array stays just below the surface of the water (effectively horizontal). An adjustable phase delay can be introduced for each transducer, allowing the sonar beam to be...

How does radar find the position of an object? And how does radar make an image? Isn't the reicever a dish so wouldn't only be able to receive magnitude related information like a microphone does with sound?

http://www.usatoday.com/news/nation/2007-10-22-radar_N.htm Just read this on yahoo. I don't know about you guys, but a 'warning letter' isn't going to stop me from going 50 in a 30.

I've driven down a road that had this sign before, but I don't understand what the process is. My girlfriend who's much more familiar with that road than I am said she didn't understand it either because her mother speeds down that road all the time and never gets a speeding ticket. So what...

Hi Members I am preparing to do a presentation on possible research opportunities in ground penetrating radar before an Industry and academic audience. Anyone with information as to what is lacking or needs improvement in current BH or GPR research in the context of Data analysis (processing...

Hey I've been wondering for a while about radar. I believe it works by bouncing a radio signal off an object and receiving the reflected radiowave at a receiver, right? My question is.. since Radar works at (i believe) short distances measured in miles... wouldn't the time it took the...

Please help me in the folowing problem: It is well known that the radar echo (police radar) establishes a relationship between the period T(e) at which a stationary observer emits successive light signals and the period T(r) at which he receives them back after reflection on an object that...

Hi, I am trying to learn about radar principles and functions. Although I have some DSP and communication background, it is still a very difficult subject by itself. I am trying to learn the basic stuffs such as MTI, doppler radar, tracking, pulse compression, probability of false alarm and...

Okay, this should really be a fairly easy problem and my work is below this question: "A radar station detects an airplane approaching directly from the east. At first observation, the range to the plane is d1 = 384 m at 40° above the horizon. The airplane is tracked for another 123° in the...

amplifiers used in Radar Immunization ?? HI Guys! well! i have read somewhere that the waves generated by a primary radar adversley affect the electronic components of the vehicles that travel in the vicinty of the airport. To immunize these effects, TWT amplifiers and Class C amplifiers are...

Doppler Radar?? Please can someone help me with doppler radar...need to know bandwidth?? Is it usually continuous wave or pulse?? or can it be both?? pretty much just after some general knowledge on doppler radar? thanks in advance!

Would it be possible for me to make a sort-of personal radar program for my laptop which would hook up to my comp via USB or something and which would display objects on my screen like people moving, etc? Actually, it's probably more like a visual motion detection software program, but...

What requirements does a radar need to meet in order to be recognized as a powerful radar?

RADAR - Radio Detection and Ranging . Can we use the same technique on a smaller scale :rolleyes: ? I mean to measure the relative velocity between two vehicles :smile: ? Are there any good sources on internet where I can get information in detail about the working of RADAR system...

Do circuits need to be used in Radar related hardware?

can a radar detect a plastic object? could the uhf and microwave signals be reflected by the target if it's made of plastic material? please give justifications :smile: thanks.

What courses do I have to take and focus on if I want to be a Radar engineer?

Hello everyone, I was just thinking about something...A police radar gun measures the speed of an object by the change in frequency of the reflected wave. For example...we might have a gun sending out a series of radio waves towards an object moving toward us like this... GUN...

I was reading something today about it being stupid to own a radar detector in Australia because the police carry radar detector detectors with them. Is this even possible? I would have assumed that radar detectors don't send out a signal of sorts but only attempt to detect incoming radar...