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6 votes

Radar terminology - Specific meaning of "video signal"

You also see this on Spectrum Analyzers; "video bandwidth" for the same reason: the video is the output voltage from the power detector used to drive the vertical on a display (when the horizontal is ...
Dan Boschen's user avatar
  • 51.9k
6 votes
Accepted

Deriving the Resolution Equation of an FMCW RADAR

Definitions: $\tau$: round-trip delay. $\Delta \tau$ = delay resolution. $r$: range. $r=c\tau/2$. Range resolution $\Delta r = c \Delta \tau / 2$. $B$: chirp bandwidth $T$: chirp sweep time $R$: ...
Ill-Conditioned Matrix's user avatar
6 votes

Is it fast time or slow time for the delay in the ambiguity function domain for radar signal?

Your question is a little bit unclear, but I'm going to try to answer according to my understanding of your question: So it sounds like you're asking about pulse-Doppler radar processing, where we ...
vintagevogue's user avatar
5 votes
Accepted

Radar Pulse Compression Gain (PCR)

The answer is yes but one has to specify $B_n$ properly to avoide possible confusions. In case if one uses a pulse compression, the bandwidth through which the receiver collects the noise will ...
kda's user avatar
  • 66
5 votes

Radar signal processing flow chart

Part of your misunderstanding comes from the fact that there are many ways in which the radar signal processing chain is implemented. Depending on the type of radar, targets of interest, hardware, etc....
Envidia's user avatar
  • 2,546
4 votes
Accepted

Pulse Compression(Chirp) SNR Gain

It's often said that pulse compression gives you a gain proportional to the time-bandwidth product (otherwise known as the pulse compression ratio, or $PCR$). This is a really misleading statement, ...
Beepboop bebop's user avatar
4 votes
Accepted

How to accurately model wideband RF reflections?

So, to give you something to read up on first, the channel you describe is a Rician or Rayleigh channel, depending on whether you have a dominant line-of-sight path or not. So, as a first approach, ...
Marcus Müller's user avatar
4 votes
Accepted

In case of using a Doppler radar, do we have to use IQ demodulation to find the direction of a target?

Radar designer here: It sounds like you’re talking about pulse-Doppler (PD) radar systems. For PD radars, the process is essentially as you described: Generate a waveform (typically at IF) and then ...
vintagevogue's user avatar
4 votes

Radar Pulse Shaping Filter

On transmit, big amplitude tapers are very rarely used on larger radar systems. This mostly just boils down to the electronics: for the sake of power efficiency, transmit amplifiers are typically kept ...
vintagevogue's user avatar
4 votes
Accepted

Doppler Map for a beginner pulsed radar

When correlating the signals using xcor(code below) the output signal is greater then the Matrix column size. What portion of that information is needed? This is because the default parameters of <...
Envidia's user avatar
  • 2,546
3 votes

Probability of False Alarm versus SNR

Hi: In statistics we call that the probability of type I error ( rejecting when true ) and type II error ( accepting when false ). The way it's done there is that, once you make an assumption about ...
mark leeds's user avatar
  • 1,117
3 votes

How to calculate sweep time of FMCW radar?

As for this question 2 months have been passed but it would be helpful for the users looking for the relevant information, There are couple of factors which are related to the sweep time, Maximum ...
Zeeshan's user avatar
  • 386
3 votes

How is angle of arrival estimated?

How is angle of arrival estimated? The estimation of angle in linear array antenna is based on the relative phase variation between the target location and antenna elements. This phase variation in ...
Zeeshan's user avatar
  • 386
3 votes
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Time-Bandwidth Product

Note that these definitions of effective duration and effective bandwidth are only useful for very specific signals, namely for (real-valued) low-pass signals that are even and centered around $t=0$. ...
Matt L.'s user avatar
  • 90.3k
3 votes

How to interpret an Ambiguity function

The ambiguity function is used in radar systems to get the distance and the relative speed of a moving object with respect to the transmitter. Is called ambiguity because it also tells about the ...
danipascual's user avatar
3 votes
Accepted

Radar signal processing - Difference between range gate/range bin

If we wanted to add a nuance, the "gate" is the actual switching on of the receiver for the duration of observing the reflected signal (which can be as narrow as a single sample, which even a single ...
Dan Boschen's user avatar
  • 51.9k
3 votes

Pulse Doppler Radar: how to filter its Range-Doppler matrix?

Two suggestions that may independently, or combined, help to solve your problem. Consider using a different window/weighting function for your FFT processing. There are window functions with low ...
GrapefruitIsAwesome's user avatar
3 votes
Accepted

Phase of FMCW linear chirp

Remember that phase is usually only defined on the $[0;2\pi[$ interval (or on $[-\pi;+\pi[$). When you do that $\mod 2\pi$ operation on your graphs, you'll notice that there's no significant ...
Marcus Müller's user avatar
3 votes
Accepted

Designing an efficient curve-matching algorithm

The two most obvious things you can try are: Fitting a Gaussian to your data and then clustering their parameters Estimate the similarity of waveforms directly and then try to cluster that Since you ...
A_A's user avatar
  • 10.7k
3 votes

DOA - 1D Music Algorithm

If you have three or more antennas, simply don't put them in a linear array. Any other array setup doesn't suffer from the ambiguity. Linear array is the worst choice here. Of course, that breaks the ...
Marcus Müller's user avatar
3 votes

CFAR Detectors and Interference

The "best" detector is a highly subjective subject, and there is (in my opinion) not a definitive answer here. I work in radar processing and I've used everything that you've mentioned in one form or ...
vintagevogue's user avatar
3 votes

FMCW Radar - Range-Doppler Plot

So the problem is that when simulating FMCW signals, there is some ambiguity in the convention on the mixing order. MATLAB's documentation makes reference to it here: "The mix operation reverses ...
Envidia's user avatar
  • 2,546
3 votes
Accepted

Aliasing in Doppler Radar

So I took a look at the slides and it seems to be giving a cursory overview of how to measure Doppler with multiple pulses, so it's very generic. Hopefully this is a pretty straight forward thing to ...
Envidia's user avatar
  • 2,546
3 votes

Does the Radar CFAR thresholds depends on the type of radar?

I’ll add a different perspective as someone who designs operational radars for a living: Yes, the CFAR threshold absolutely depends on the radar system at hand. Ignoring the academic topics of ...
vintagevogue's user avatar
3 votes

range-doppler map to range-velocity map conversion

First some background. In radar the relationship between range rate, $v$ and Doppler frequency offset, $\Delta f$ is given by: $$v = -\frac{c}{2} \frac{\Delta f}{f_c}$$ where $c$ is the speed of light ...
GrapefruitIsAwesome's user avatar

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