FMCW Radar and Ranging

Started by Randy Yates in comp.dsp5 years ago 7 replies

Gentle comp.dsp readers, I've read a few places around the web that FMCW radar is good for ranging. Why? Why wouldn't a "standard" pulse radar...

Gentle comp.dsp readers, I've read a few places around the web that FMCW radar is good for ranging. Why? Why wouldn't a "standard" pulse radar be just as good? I understand that as the range becomes short, the time difference detected by a pulse radar would become very small. In that case an FMCW radar, which detected range via delta f, might be easier or more accurate, especially with a...


Radar

Started by Anonymous in comp.dsp9 years ago 41 replies

What's the smallest object that can be resolved on radar? eg could a large model aircraft be seen or would it be confused with say a large bird?...

What's the smallest object that can be resolved on radar? eg could a large model aircraft be seen or would it be confused with say a large bird? How low does radar go in a city? Why am I asking? I have reason to believe that the next generation of terrorists will use UAVs to hit their targets. In fact this is well known and no secret. So what can be done to stop such an attack? K.


Digitizing waveforms from a 2-5 GHz radar

Started by Rune Allnor in comp.dsp14 years ago 4 replies

Hi all. For some reason I posted this question on sci.engr.radar+sonar without crossposting to comp.dsp. I am sure there are somebody here...

Hi all. For some reason I posted this question on sci.engr.radar+sonar without crossposting to comp.dsp. I am sure there are somebody here who have some advice. I have been invited to comment on a non-mainstream radar application. From what I can see of the basic prospect, there are some assumptions on the recieved data that I find a bit dubious. These assumptions are not, however, obv...


Ask a question about UWB through wall radar

Started by sugarfish in comp.dsp10 years ago 4 replies

Hi!all I am perform on UWB through wall radar research. The most advanced through wall radar system is the "Xaver 800" produced by...

Hi!all I am perform on UWB through wall radar research. The most advanced through wall radar system is the "Xaver 800" produced by Israel Camero-Tech Ltd. The "Xaver 800" used the ultra short pluse with bandwidth about 7GHz. How to sample and digitalize such wideband signals? If i must get a AD converter faster than 7G? Thanks _____________________________________ Do you know a compan...


radar's signal processing

Started by umair039 in comp.dsp9 years ago 4 replies

hi i am working on the processing of radar signals,, i have a constant PRI(pulse repitition interval) radar and i take (say 40)pulses ,...

hi i am working on the processing of radar signals,, i have a constant PRI(pulse repitition interval) radar and i take (say 40)pulses , calculate their difference histogram to identify peaks(in a histogram), from peak i can calculate the incoming pulses' PRI i want to ask if i add a gaussian noise in my incoming radar signal pulses, its difference histogram is spread-out, and the peaks are no...


correlator for radar

Started by sunil_ue in comp.dsp11 years ago 6 replies

Hi every body, Now I am working on radar receiver designing. The radar transmits 10MHz 31-bit pn code multiplex with 10kHz sine wave. At the...

Hi every body, Now I am working on radar receiver designing. The radar transmits 10MHz 31-bit pn code multiplex with 10kHz sine wave. At the receiver side, It has 1) the 31-bit pn code and 2) highly noise affected and delayed the transmitted signal Now I want to design a digital correlator to detect the delay. As soon as I receive the noisy delayed transimmited signal I am converting it into...


passive radar theory refrence needed

Started by Peter Divos in comp.dsp11 years ago 6 replies

Hi, I heard there are some types of radar which operate passively, this means, they dont send any signal and dont wait for the echo, but...

Hi, I heard there are some types of radar which operate passively, this means, they dont send any signal and dont wait for the echo, but they get some random electromagnetic waves from the air which are reflected on objects as well and it is possible get some image in exchange of some computation. I also heard of a swiss company who are using the same principle but in geology, seismology,...


Penetrating Radar

Started by Anonymous in comp.dsp13 years ago 21 replies

I've read somewhere that UWB-based Radar has been used by the military because of its ability to detect objects through walls. It's...

I've read somewhere that UWB-based Radar has been used by the military because of its ability to detect objects through walls. It's not intuitively obvious to me why a wideband system would have this capability. Can someone explain it? -- Randy Yates Sony Ericsson Mobile Communications Research Triangle Park, NC, USA randy.yates@sonyericsson.com, 919-472-1124


Noise reduction in radar signals

Started by timo...@gmail.com in comp.dsp8 years ago 1 reply

Hi all, I'm just starting out on the long road of researching noise reduction in radar signals (i guess clutter or speckle noise reduction)....

Hi all, I'm just starting out on the long road of researching noise reduction in radar signals (i guess clutter or speckle noise reduction). I'd really appreciate it if anyone had any pointers to recent top quality journal papers in this area? Or indeed any other suggestions or comments. Many thanks!


FFT and number of samples..A "simple" doubt?

Started by night in comp.dsp9 years ago 5 replies

Hi, I'm supposed to analize a received signal on a Doppler continuous wave radar for an university practice. I only have a file with...

Hi, I'm supposed to analize a received signal on a Doppler continuous wave radar for an university practice. I only have a file with samples taken at 20KHz. The only information I know about the radar is its center frequency (24GHz) and trasmitted signal power. The recieved signal values that I have are the baseband outputs of the front-end that have a DC offset of 2.6Volts and seem to ...


Estimation or detection?

Started by fl in comp.dsp4 years ago 1 reply

Hi, I read Steven Ray's book: Fundamentals of Statistical Signal Processing, Volume I: Estimation Theory. It gives several type estimation...

Hi, I read Steven Ray's book: Fundamentals of Statistical Signal Processing, Volume I: Estimation Theory. It gives several type estimation problems in its first chapter, such as measurement of DC voltage in WGN, amplitude/frequency/phase of sine wave, and radar echo from a distant plane etc. Most of the examples are used repetitively in thereafter chapters except radar echo. My pro


SAR matched filters?

Started by Bo in comp.dsp11 years ago 14 replies

I'm TOTALLY new to RADAR world and am looking for some pointers/info in regards to SAR radar. In particular, I am interested in finding out...

I'm TOTALLY new to RADAR world and am looking for some pointers/info in regards to SAR radar. In particular, I am interested in finding out how matched filters can be implemented for X band SAR radars. I know that one method is through DSP of sampled data---but in our particular case, needing 500MHz- 1GHz bandwidth, I don't see that sampling I/Q data for those bandwidths is practical. (...


Radar Doppler Question

Started by Anonymous in comp.dsp11 years ago 4 replies

I am new to DSP and am currently implementing processing on Radar systems. I am presently taking a window around the returned/simulated target...

I am new to DSP and am currently implementing processing on Radar systems. I am presently taking a window around the returned/simulated target return and digitizing the return at 80MHz, and then push the data through a 256 point FFT with a Hanning window. The return has been mixed to an IF of 20MHz and I always take my data point from that bin, because the target will never provide enough D...


Reflection Coefficients from FMCW Radar Homodyned Signal

Started by Nicholas Kinar in comp.dsp10 years ago 2 replies

Hello, All-- I have an FMCW radar dataset that consists of reflections from a layered ice medium. Let s[t] be the original frequency-swept...

Hello, All-- I have an FMCW radar dataset that consists of reflections from a layered ice medium. Let s[t] be the original frequency-swept signal that has been sent out from the receiving antenna, and s'[t] be the signal that has been received. Signals s[t] and s'[t] are homodyned by multiplication in the time domain. Let s_h[t] be the homodyned signal in the time domain. I then u...


fmcw radar range doppler

Started by hozz in comp.dsp6 years ago

Hello everyone, I am trying to plot range-doppler diagram for an fmcw radar. Here is how I generate transmitted,received and video...

Hello everyone, I am trying to plot range-doppler diagram for an fmcw radar. Here is how I generate transmitted,received and video signal; %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%% clear all; close all; clc c=3e8; %speed of light fc=8e9; %carrier freq deltaF=32e6; %sweep freq T=1e-3; %one period alph=deltaF/T; %sweep rate R=500; %initial distan...


Doubt about radar beamforming

Started by Fox in comp.dsp11 years ago 4 replies

Hello, I'm developing a radar project but I have a problem. The project consists in the position (elevation and azimuth) and velocity estimation...

Hello, I'm developing a radar project but I have a problem. The project consists in the position (elevation and azimuth) and velocity estimation of a target using a 2D array antenna. The DOA of the signal reflected by the target has to be estimated using beamforming. I'm reading something about DOA problem but any model is based on the assumption that the signal trasmitted is a narrowband signal,...


Bistatic Radar Tracking with EKF

Started by hmahdi12 in comp.dsp11 years ago 1 reply

Hello I designed a bistatic radar tracker with Extended Kalman Fileter. The model I that used is the constant velocity model. The measurements...

Hello I designed a bistatic radar tracker with Extended Kalman Fileter. The model I that used is the constant velocity model. The measurements are: Doppler rang, Azimuth and Doppler frequency. the rang & Doppler measurements' covariance noise is low, but the Azimuth is too noisy. The state vector contained: x,vx,y,vy. My tracker works well when the distance between transmitter and receiver is ...


Sensor fusion with Kalman filtering with different sensor sample rates?

Started by Sven in comp.dsp11 years ago 1 reply

Could you explain how to combine two different measurements with two different sample rates to make an estimate with a Kalman...

Could you explain how to combine two different measurements with two different sample rates to make an estimate with a Kalman filter? Lets say I have want to estimate a position and I have an eccelerometer and something else that measures position (a radar or something). The position (radar) measurement has a rate of 1 measurement per second and the eccelerometer has 1000 measuremen...


Sliding Pulse Repitition Interval

Started by umair039 in comp.dsp8 years ago

Hi. i am working on a project for the detection of Sliding PRI of a radar signal. the sliding PRI time of arrivals of a radar signal are...

Hi. i am working on a project for the detection of Sliding PRI of a radar signal. the sliding PRI time of arrivals of a radar signal are generated by the following code in MATLAB: T = 600000; % total time duration for which pulses are generated startpri = 1000; endpri = 4000; sliderate = 300; % Generating time of arrivals(toas) of Sliding PRI toa = zeros( 1, round( T/ startpri ) ); ...


Question about reducing noise in a radar receiver

Started by LPG1976 in comp.dsp11 years ago 12 replies

Hi, I have to find a new radar receiver design to increase the SNR. The signal bandwidth is 2 MHz (a CW Phase modulated signal). With a common...

Hi, I have to find a new radar receiver design to increase the SNR. The signal bandwidth is 2 MHz (a CW Phase modulated signal). With a common receiver design (receiver BW at 2 MHz too), the SNR is too low for detection. To increase the SNR, I can reduce the noise power in my receiver by reducing the receiver bandwidth. Can someone tell me if it's possible to do that and how (filter bank maybe?...