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correlator for radar

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 ...

Ask a question about UWB through wall radar

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 ...

Bistatic Radar Tracking with EKF

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...

Noise reduction in radar signals

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. M...

radar's signal processing

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 no...

Re: Radar

On Jun 15, 1:04 am, "VelociChicken" wrote: > wrote in message > > news:b1c61a34-8069-43e1-bed4-ed726d54c535@59g2000hsb.googlegroups.com... > > > 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 ...

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

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 ...

Digitizing waveforms from a 2-5 GHz radar

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 a...

Re: Why do we need allpass filter?Why is the frequency negative?

Lee wrote: > Hi, > > Some questions I cannot understand right now. Could you do me a > favor?Thanks, > > Question 2: > In Fourier transform, frequency domain has negative freqency, why? We > know Omega = 2*PI/T. If Omega is negative, T will be negative. What is > its "physical" mea...

Re: Correlation error derivation?

On 05/25/2010 08:36 AM, gct wrote: > Say I'm correlating a known signal against a received signal, obviously > there's going to be some error in my peak location due to noise. I know > you can formulate the error as a function of bandwidth, correlation time > and SNR, but I've never seen it...

Doubt about radar beamforming

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...

Question about reducing noise in a radar receiver

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...

passive radar theory refrence needed

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 computa...

Re: Vehicle distance/speed sensor

> Any sensor that can measure speed, of course. This isn't a field that > has a huge base universal solutions. There is a lot of room for > creativity, with a lot of variety of solutions depending on your > particular price, size, and labor constraints. > > In this case I think you just...

Sensor fusion with Kalman filtering with different sensor sample rates?

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 (r...

Re: How to do non-uniform (sampling) DFT?

walala wrote: > Hi all, > > Can anybody point me to some helps/tutorials/references/stories on how > to do non-uniform (sampling) DFT? > > Thank you very much for your help, > > -Walala Here is a good source: Technique for frequency analysis of unevenly sampled radar data H...

Re: zero padding once again

fisico32 schrieb: > But, in my mind, resolution means getting more values, see deeper, more > precisely. And that seems to be what zero padding does. We can argue if > interpolated values are just estimations ( not as truthful as real data). No it does not increase the resolution it jus...

Radar Doppler Question

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 ...

Literature on remote sensing

Hi all. I am involved in a project where we want to measure a physical quantity by means of acoustics. We have tried ultrasound pulse signals with a certain amount of success, but it seems we have pushed the system to the edge of the envelope. So we need to explore other options to reach the...

Re: the 0th and 1st derivative of a scary function

finally some clear skys http://radar.weather.gov/ridge/Conus/full_loop.php ...

Re: Sampling: What Nyquist Didn't Say, and What to Do About It

In comp.dsp John Larkin wrote: (snip) > It records rms volts, amps, power, but doesn't try to reconstruct the > raw waveforms; so the Sampling Theorem doesn't apply. That didn't stop > all sorts of people from arguing that the sample rate had to be twice > that of the highest reasonabl...

Frequency Sweep Sonar System

I am conducting research in the implementation of algorithms for a frequency-sweep sonar system, and I have a few questions regarding the approaches to this problem. (1) I have two transducers that are mounted next to each other facing a flat target situated at a fixed distance _y_ away fro...

Re: Nyquist constrain and IQ represented signal

Jerry Avins wrote: > Steve Underwood wrote: > > Jerry Avins wrote: > > > Rune Allnor wrote: > > > > > > ... > > > > > > > Nyquist's criterion for a single sideband IQ signal > > > > (which formally is complex-valued) is Fs > = BW. > > > > > > Almost. Fs > BW. When the inequali...

Re: Visual "clipping"?

"Michael A. Terrell" wrote in message news:46E66841.17A3C1E1@earthlink.net... > Are YOU willing to make repairs over 1000 feet in the air, while > hanging from a harness? I always liked the time I spent in a climbing harness attached to something firm. It was the unclipping to ta...

Re: wide band aliasing noise in the spectrum of non-uniformly sampled signal

qaisar wrote: > Hello, > > As you know that whenever we perform GDFT( General Discreat Fourier > Transform), on a nonuniformly sampled data, we obtain wideband alysing > noise alongwith signal spectrum, which donot allow us to analyse the > signal with apprepriate approximation. ...

Re: Frequency Filtering Algorithm

"Jerry Avins" wrote in message news:40d1b4c8$0$3010$61fed72c@news.rcn.com... > Fred Marshall wrote: > > ... > > > I feel that something is missing in this discussion. One thing is range > > resolution necessary. The other is getting rid of the chirp. The other is > > an...

Sliding Pulse Repitition Interval

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 = ...

Re: Penetrating Radar

Steve Underwood wrote: > David Kirkland wrote: > > > Eric Jacobsen wrote: > > > > > On 06 Jan 2005 19:04:32 -0500, Randy Yates > > > wrote: > > > > > > > > > > I've read somewhere that UWB-based Radar has been used by the military > > > > because of its ability to detect obje...

FMCW Radar help required.

Hi All, For an FMCW Rdar I plan to provide a 100us ramp to sweep 300MHz . I get an (IF) of 40Khz for a distance of 1meter . My Gunnplexer datasheet shows an (IF) band width of no more than 5000Hz . Then how is it possible to capture 40Khz (IF) ? . Charles ...

Re: Off-The-Shelf UWB Radars?

Perhaps... Did you check out Time Domain? We recently purchased one of their radios and are going to use it in a monostatic radar application. Biggest problem for us is the FCC15 power limit that is imposed on the radio--and thus, very limited distance. We are looking at ways to boost this ...

Re: Masters in Applied Math w/ concentration in EE & DSP

On 8 Jan, 21:39, Tim Wescott wrote: > On Sun, 08 Jan 2012 01:39:26 -0800, Rune Allnor wrote: > > I will not pretend to be able to tell you what to do. But I can > > confidently tell you what *not* to do: Stay away from a carreer in DSP. > > Pursue DSP if you want, but don't let it be...

Reflection Coefficients from FMCW Radar Homodyned Signal

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 mu...

Re: How do I calculate entropy?

Randy Yates wrote: > Hold on a minute there, cowboy. Where in the tarheeled' nation > did you get that? "The Minimum Entropy Criterion of Range Alignment in ISAR Motion Compensation", Genyuan Wang and Zheng Bao, Radar 97, 16 Oct 1997, p. 237, equation (4). OUP ...

FMCW circuit

i am on a entry level of frequency modulated continous-wave(FMCW) radar. i want to begin with some classical designs of the FMCW circuit. where can i download some design of the FMCW circuit? pswd ...

Re: sound elevation detection algorithms

On Thu, 21 Jun 2007 17:09:07 GMT, Richard Dobson wrote: > Sylvia wrote: > > > I meant two microphones that are inline horizontally(not vertically).i can > > ofcourse do azimuth detection by using ITD etc.if elevation detection > > cannot be done with this scenario,what additional info...

Re: spectral subtraction of signals other than noise

adj wrote: > i have been reading a lot of messages on spectral subtraction and how > it is useful in reducing background noise. i have tried this in matlab > and i was highly successful in attenuating the noise from a sound > file. Exactly how did you do this? Was there already noise...

SAR and pulse variations

Hi, I have a question regarding radar/SAR and pulse variations / multifrequency signals. Are there any specific advantages of using pulse diversity in range measurments, i.e. to illuminate the same reflectors using for example two different pulses ? Or there is little to gain from that ? ...

Re: comp.dsp - a FAQ

dbell wrote: > In the sense of maintaining correct dimensions in calculations that you > commented about earlier (as in math class), you do use them as > dimensioned quantities, where you have defined the dimension as > corresponding to the way they were generated and not the mathematical >...

Shifting data before FFT

I'm doing some DSP for radar applications. My background in DSP is limited, so I'm trying to get up to speed. Performing a circular rotation to move the beginning of data to the center of the dataset before a FFT and then rotating back after seems to be routine (almost taken for granted). Ca...

Re: Unwrapped Phase

On Apr 15, 1:59 pm, splatspaminthe...@gmail.com wrote: > On Apr 15, 1:36 pm,Greg Heath wrote: > > On Apr 14, 1:54 pm, "norwood_dave" wrote: > > > > I have only taken one undergraduate DSP course and have started reading > > > about unwrapping phase. > > > > I was told if I ...