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Questions tagged [radar]

Anything related to RADAR (RAdio Detection And Ranging) systems and radar signal processing.

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Phase of FMCW linear chirp

I'm doing a project involving FMCW linear chirp signals. Given the phase $\phi = 2\pi\frac{k}{2}t^{2} + 2\pi f_{c} t + \theta$ where $k$ is the frequency increase rate. When transmitting ...
Damuno's user avatar
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1 answer
1k views

Probability of False Alarm versus SNR

I'm currently testing the performance of an energy detector using two tests. One test involves finding the optimal threshold to achieve a probability of detection(Pd) of 0.9 and a probability of false ...
Tellrell White's user avatar
1 vote
1 answer
3k views

Simulation of FMCW radar in frequency domain

I would like to simulate a FMCW radar in the frequency domain. I used the code (Matlab) I attached below. Specially I am interested in the phase spectrum of the beat signal. In a further research I ...
Pavel's user avatar
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5 votes
1 answer
2k views

Radar Pulse Compression Gain (PCR)

Assume a monostatic radar is transmitting a pulsed waveform. The pulse has been modulated by a Barker code with$\ N$ chips or bits. The waveform chip rate is $\tau_c $, the radar receiver's detection ...
random_dsp_guy's user avatar
1 vote
0 answers
4k views

Correct Radar Range Equation for SNR at Detection

Assuming you'd like to estimate the probability of detection of a target for a monostatic radar. For estimating detection SNR of a monostatic radar for given target rcs signature, do you use the ...
random_dsp_guy's user avatar
1 vote
2 answers
6k views

Is it possible to make 3D point cloud with RADAR?

Is it possible to make 3D point cloud with RADAR? Both LIDAR and RADAR are EM waves, but with different wavelength. So, if it is technically possible to make point clouds with LIDAR, why is it not ...
infoclogged's user avatar
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1 answer
631 views

Is it possible to get the velocity vector for tangential movement using radar?

When an object appears towards the radar sensor or goes away from the radar sensor, there is a change in the phase shift of the frequency and from that, the velocity can be inferred. So, I have two ...
infoclogged's user avatar
1 vote
1 answer
3k views

How is angle of arrival estimated?

I have simulated a phased array antenna. I have also simulated a point source. I don't get how to calculate pseudo spectrum vector without using the position of the source. Algorithms such as Capon ...
Anagha's user avatar
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3 votes
1 answer
4k views

Time-Bandwidth Product

The following text is cited from a textbook, "Spotlight Mode Synthetic Aperture Radar: A Signal Processing Approach", I would like to ask if anyone knows the proof to the following statements, as the ...
Samuel Low's user avatar
4 votes
0 answers
117 views

Finding the parameters and endpoints of a sinusoid

Suppose I have some signal $$ s(t) = n(t) + \left\{\begin{aligned} &0 &&: t < t_0\\ &A e^{i (2 \pi f t + \theta_0)} &&: t_0 \le t \le t_1\\ &0 &&: t > t_1 \...
alessandro's user avatar
2 votes
1 answer
1k views

Radar Imaging Method

I've been working with an FMCW Fast Chirp radar transceiver. Mainly, I've been looking at the Doppler range map but really it is not suitable as there is only one point per range/ speed and I want to ...
SeanJ's user avatar
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3 votes
2 answers
437 views

Should the transmitted signal be continuous in FMCW?

I am a novice in this field and working on respiration detection through near ultra-sound between $18 \textrm{kHz}$ and $20 \textrm{kHz}$. In the referece article and other radar use articles, the ...
tooGood's user avatar
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2 votes
1 answer
2k views

Array Signal Processing: What are snapshots in Direction of Arrival estimation?

I do have an overview of basic radar signal processing chain [Data cube, 3 stages of FFT, Range, Range-Doppler map, coherent/non-coherent integration, coarse DoA etc.]. I am now trying to understand ...
Raj's user avatar
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1 answer
3k views

FMCW Radar: Need for Second stage FFT for velocity determination?

I have understood that for the purpose of Range determination, the samples of the beat frequency are first assembled per chirp. The beat frequency is directly proportional to the range of the ...
Raj's user avatar
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FMCW RADAR FFT Processing

I'm working on the processing of raw FMCW radar data. In my case the radar works in the [6.014-7.76] GHz band (I have 187 frequency points starting from 6.014 GHz and ended with 7.76GHz) and the data ...
Luca Romano's user avatar
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1 answer
1k views

How to reduce spectral leakage?

We are looking at FMCW radar ADC signals and converting from the time domain to the frequency domain in order build a range doppler map but want to have the best signal to noise ratio possible. In ...
SeanJ's user avatar
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2 votes
2 answers
4k views

How to interpret an Ambiguity function

I need to evaluate several different waveforms regarding their doppler tolerance, for use in a radar application. So I came across something called the Ambiguity function. The following picture shows ...
Timo's user avatar
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1 answer
311 views

High performance DSP processor with better on-chip memory

I am currently using a combination of 4 ADSP 21469 because of the complexity and huge chunk of code that I currently have. BOOT and application will execute from external Flash memory. The code for ...
Ram's user avatar
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2 votes
0 answers
275 views

Help detecting target in pulsed radar signal

This signal is from the Pasternack $2.4\textrm{ GHz}$ development kit. The saved signal appears to be the pulsed waveform. It is sampled at $20\textrm{ kHz}$ for $4130$ points. I recorded a ...
user avatar
5 votes
1 answer
3k views

Radar SNR for a LFM Waveform

How do you estimate the detection SNR for a radar transmitting an LFM (chirp) waveform? I'm looking for an SNR equation that is a function of chirp bandwidth and compressed (or uncompressed) ...
random_dsp_guy's user avatar
5 votes
2 answers
4k views

Radar terminology - Specific meaning of "video signal"

In the radar literature, particularly in older references, the term "video signal", "downrange video", or just "video" is used to describe the radar signal at a certain point in the processing chain. ...
Robert L.'s user avatar
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1 vote
1 answer
5k views

Radar signal processing - Difference between range gate/range bin

In learning about radar signal processing, I see two different terms that sometimes seem to refer to the same thing, but sometimes different things: Range gate Range bin Usually, I interpret both to ...
Robert L.'s user avatar
  • 2,222
3 votes
1 answer
2k views

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

I want to simulate a Pulse Doppler Radar with medium pulse repetition frequency (PRF about $100\textrm{ kHz}$, about $500$ pulses in pulse train). It's rather powerful, and should discriminate ...
Felix's user avatar
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1 answer
2k views

FMCW Radar Working Logic Question

In FMCW radar rather than sending a signal at a constant frequency we are sending a chirp which goes e.g. from 6 GHz to 6.1 GHz in 5 ms. What I cannot fit in my mind is this (numbers are just for ...
snrIcmn's user avatar
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2 votes
1 answer
171 views

How to accurately model wideband RF reflections?

I would like to model a transmitter and received pair, both sampling at the same bandwidth (not clock synchronized), where there are a number of reflectors. The time delay due to the reflectors can be ...
awelkie's user avatar
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0 votes
1 answer
2k views

Angle of arrival (AOA) estimation using FMCW radar using MUSIC algorithm

I am working with FMCW phased array radar with only upchirps. The range doppler matrix is obtained using the two dimensional fast Fourier transform on multiple chirps. I want to obtain the angular ...
Zeeshan's user avatar
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1 vote
1 answer
128 views

How does the error in azimuth angle vary as one moves away from the boresight direction of a radar

My question is basically same as the title. I am trying to find a mathematical model which provides the error, $d\theta$, in azimuth angle($\theta$) as one moves away from the boresight direction of ...
user146290's user avatar
0 votes
2 answers
561 views

How should you decide on the number of sweeps to be used in FMCW radar?

I am designing an FMCW radar in MATLAB and I would like to know on how should I decide on the number of linear sweeps in FMCW .Does the number of sweeps affect the performance?
Hp179's user avatar
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1 vote
1 answer
3k views

How to calculate sweep time of FMCW radar?

I am designing a FMCW radar with center frequency 24GHz and sweep bandwidth of 150 MHz. How do I decide on the sweep time of the FMCW radar?
Hp179's user avatar
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5 votes
4 answers
8k views

Pulse Compression(Chirp) SNR Gain

I've created both single tone signal and a LFM chirp signal with same pulse duration and cross correlated both of them with their own(matched filter). Peak points of both results were same as expected ...
menderft's user avatar
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1 answer
733 views

Radar: FMCW or CW

I purchased a Doppler radar that can run in both CW and FMCW modes. I don't understand how to operate the radar in FMCW mode. I would like to understand what I need to do to get my radar to run in ...
wwjdm's user avatar
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1 vote
3 answers
245 views

Are radar resolution and detection capabilities not very tightly related?

Radar detection capacity is the capacity to determine the presence or absence of targets whereas the resolution is the capacity to identify two closely separated targets. If you can detect the target ...
Seetha Rama Raju Sanapala's user avatar
1 vote
1 answer
3k views

Range-Doppler matrix

I am working on a radar simulation to calculate the range and the Doppler frequency of a target. I would like to build a range-Doppler map or range-Doppler matrix. I do not know the steps to develop ...
user16612's user avatar
0 votes
0 answers
436 views

Monostatic range-doppler algorithm

I was told that this question is too broad. Maybe I don't understand what this forum is about. My question is basically the same. I am looking for references to range Doppler algorithms so I can learn ...
user16612's user avatar
3 votes
1 answer
385 views

Probability of Detection and pulse-pulse decorrelation time

I'm trying to analyze the probability of detection ($P_d$) for a Swerling II target. I know that the Swerling II target assumes that the Radar Cross Section (RCS) is an exponential probability density ...
Rob's user avatar
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3 votes
2 answers
3k views

How to calculate resolution of radar?

I am working of FMCW radar. Below are all the parameters of FMCW radar. How can I Calculate the resolution of my radar ...
Mayank's user avatar
  • 31
0 votes
1 answer
878 views

Frequency response of FIR (MTI delay line canceller) with non constant period

Short question How to plot the magnitude of frequency response of the delay line canceller with non constant period using GNU Octave? Or more directly: how to plot magnitude of frequency response of ...
Gluttton's user avatar
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2 votes
1 answer
540 views

Plot the frequency response of MTI delay line canceller using Octave

I try to plot the frequency response of the delay line canceller (FIR filter which used for MTI). The delay line canceller has the following structure: ...
Gluttton's user avatar
  • 388
1 vote
0 answers
88 views

Interpolation methods for radar and acoustic imaging and potential pitfalls

A) What are the most common methods used to remap data for current generation imaging radars and acoustic sensors? B) What are some of the pitfalls in these methods? For example, in the past, at ...
Tom Copeland's user avatar
0 votes
0 answers
458 views

Why the radar (moving) target return is not centered at zero frequency

In Radar signal processing, one has to separate clutter(unwanted signals) from moving target signals. The picture given below is an example of Radar Signal Power Spectrum(taken from the book Radar ...
Vinod's user avatar
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