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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...

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...

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...

Re: philosophical question about sharing information

> USPTO will grant patents on most > anything these days and they never seem to know where to look for the > right prior art. The USPTO researches ONLY current patents and applications, which includes unpublished applications and a few of the special application types (which might include the c...

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...

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...

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...

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...

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...

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 ...

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 ...

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 >...

Looking For URL's To Learn About Phased Array Radars

Hello, I've taken a lot of non-credit courses on radar, but I find that I know almost nothing about Phased Array radars. Where on the Internet is a good place to learn about them? (I want the failrly advanced technical information and novice's practical information.) Thank you, ...

Looking For URL's To Learn About Phased Array Radars

Hello, I've taken a lot of non-credit courses on radar, but I find that I know almost nothing about Phased Array radars. Where on the Internet is a good place to learn about them? (I would like fairly advanced technical information as well as pratical information for a novice.) ...

tracking sound source

Does any one know good material on tracking single sound source using only two microphones on a dummy head.I have seen kalman filter tracking for constant velocity targets etc in case of radar applications but i dont know how to use these in case of sound sources. Thanks ...

Re: DSP: basic signal detection in Matlab (help!) :)

boo hoo... I'm sure some of you must be detection whizzes.. yes? no? radar anyone? this problem is super-basic, but I'm stuck. Can somebody just download the m-files (http://www.podoboq.com/podoboq/basic_detect.zip) and take a look at my transfer functions? If it's a DSP-related error, I wou...

multipath over sea for radar

hi i am trying to simulate a multipath environment over sea . am i correct in assuming that my echo at low grazing angles will comprise of four paths ( combinations of the direct and surface bounced path). A lot of litearture suggests that only two paths are sufficient where as a few talk about us...

Re: Acoustic Beamformer

Hello, do you like to make a acoustic "Radar" ? Look at http://www.acoustic-camera.com as far as i know its a development of the TU Berlin, but i am not shure. and if you like to know more you may attend the Berlin Beam Forming Conference November 2006 look at: http://www.acoustic-c...

Doubt about autocorrelation

Hi, I have real data from a radar like range and azimuth, and I want to find the Center of Mass Correlation that it is correlation process to perform a Plot Extraction sometimes called Hit processing. I found this in the page http://www.radartutorial.eu/10.processing/sp13.en.html but I don't know ...

ADC with 50MSPS attached to DSP

Hi, I need to analyze echoes of a 13MHz pulse RADAR using a DSP. I would like to use a 12-bit, > 50MSPS ADC to sample the signal. Is it possible to attach the ADC (e.g AD9226) directly to the parallel port of a DSP and transfer the data vie DMA? Did anyone try to attach such high-speed A...

Re: kalman filter radar tracker

jamie wrote: > I've got a radar tracker which contains 3 Kalman filters. > > The first filter (which I term the range filter) is for range, velocity, > and acceleration, with range and velocity being measured. > > The range filter performs nicely. I'm using a plant noise model from >...

MVDR filtering: Singular Correlation Matrix

Hello Folks, I am trying to implement a MVDR (Minimum Variance Distortionless Response) filter instead of the usual correlation processing (matched filtering) for a pulsed radar application. The pulse waveform that we use is a linear FM chirp (so that the correlation operation is essentially ...

who can help me?

I want to download a tutorial of SAR technology "Radar Interferometry" on the website "www.grss-ieee.org", but it needs a GRSS account of IEEE member, who have the GRSS account and can help to download the tutorial? Thanks very much! I need the tutorial very much! ...

Re: Time-Frequency Resolution, Uncertainty Principle

"Fred Marshall" wrote in message news:hCoMa.2112$Jk5.1132401@feed2.centurytel.net... > > "Hristo Stevic" wrote in message > news:d32b134353ea65fb7da3e1a13028a28c.52609@mygate.mailgate.org... > > Hi > > > > I am little bit confused about the issue of time-frequency resolution ...

OT: is sign correlation faster than normal correlation on DSPs?

Stan Pawlukiewicz wrote: > Jerry Avins wrote: > > > Stan Pawlukiewicz wrote: > > > (snip) > > > > > I don't, much. Thanks for the education. > > > This stuff is olde, you can find some of it in the MIT Radiation Lab > series. I lent my "Principles of Radar" to my son ...

Re: OT: Where did you get your start?

Chris.Gammell wrote: > Hey all, > > I was just wondering how everybody got their start in DSP. I am personally > geting mine by working with FPGAs and Simulink tools. Also, I am working my > way into hand coding DSP chips (hence the reason I'm here!). Anyway, just > wondering, as I think...