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Questions tagged [radar]

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

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Radar Signal Modelling based on Channel Estimation

I am a newcomer to digital signal processing. Recently, I have been interested in this question: If we model a reflected radar signal from a target as $$y(t)=h \ast x(t) + n(t),$$ where $h$ is a ...
Rayzain's user avatar
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Why is my target showing up with a non-zero centered velocity? I captured this data using the IWR6843A0P using a stationary corner reflector

I need help understanding what I should do to determine why my target is showing up in my Range doppler map with a non-zero centered velocity when I captured my measurement using a stationary corner ...
level2fast's user avatar
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9 views

Synchronization TX and RX pulses in Pluto-SDR

I am currently working on implementing a FMCW radar for SAR application, I have successfully generated, transmitted, received the CWchrip. But when I move to the calculation of the beat frequency by ...
Raj Patil's user avatar
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1 answer
94 views

SAR and ISAR sampling time

This is a repost of a question that I've previously asked in the EE section of SE. Unfortunately, I've not solved my problem. I'm seeking insight into the typical values of sampling times or refresh ...
matteogost's user avatar
3 votes
1 answer
131 views

Continuous wave Doppler radar

I am developing a continuous wave Doppler radar to detect human movement at a speed of 0.2-6m/s. For a radiation frequency of 24.15 GHz, the Doppler shift during longitudinal motion will be equal to ~...
red15530's user avatar
1 vote
0 answers
62 views

How does the shape of a FMCW radar work in Python?

I’m a beginner to this field, so sorry if my questions aren’t the best, or if I’m missing information. Anyways, I’m working with raw data samples from a FMCW radar. Basically, a frame constitutes of [...
Aquelae's user avatar
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1 answer
109 views

Why are polyphase codes doppler tolerant in comparison to bi-phase codes?

What is the logical reason behind this? Why are P1,P2, P3, P4 codes unaffected by doppler shifts?
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I want to transmit a CW signal using SDR could be pluto or hackrf but I haven't used any one of them can anyone help me

I am using HackRF or Pluto SDR for transmission of a CW signal, after reading the documentation of the HackRF one SDR I found out that it transmits data in only 8-bit signed quadrature samples. Now I ...
Raj Patil's user avatar
1 vote
3 answers
270 views

doppler tolerant phase coded waveforms

how do i conclude a waveform shows doppler tolerance, say polyphase code-frank code, without the use of ambiguity diagram? we know that it is doppler tolerant and if we check the frequency spectrum of ...
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1 answer
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Chirp pulse train FFT

I'm trying to understand why the Fourier transform of a chirp pulse train looks the way it does. I will attach the result I get in MATLAB at the end of the question. I tried to develop analytically ...
Student2222's user avatar
1 vote
2 answers
96 views

Difference between Likelihood Estimation and CRLB Estimation for Cooperative Radar

I do not know if this question fits this stack, but I think it might suit here because it is something related to the radar sensing processing. The question is about the difference between the ...
Loco Citato's user avatar
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Simulating 32x32 Radar Configuration from 64x64 FMCW Radar Data

I have gathered data using an FMCW Radar with a configuration of 64 chirps per frame and 64 samples per chirp. Now, I'm trying to simulate the data as if it were collected by a radar with a 32x32 ...
Eric's user avatar
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49 views

I am trying to plot range of a target in a FMCW radar

I am working on the simulation of FMCW radar, and I am trying to figure out how to plot the target range using the impulse response of the beat signal. I have successfully generated the chirps and the ...
Raj Patil's user avatar
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1 answer
84 views

Range Doppler Graph

The graph includes a peak at zero frequency and some other frequencies. However, my professor says that there should not be a peak at zero. I contend that he is wrong. But my graph is also not right, ...
Waseem's user avatar
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2 votes
1 answer
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How to simulate multiple targets in FMCW radar simulation in python?

I have simulated a FMCW radar for a single stationary target, now the next step in my project is to simulate multiple moving targets. For this I had thought of using doppler shift to show a difference ...
Raj Patil's user avatar
2 votes
2 answers
357 views

What does really Time Chirp contribute to Range and Doppler estimation in FMCW radar signal?

As I started researching FMCW radar signals, I discovered a popular reference code for FMCW simulation in Github. One of the most important things that I still don't understand is the parameters ...
Rayzain's user avatar
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Image generation from Radar (IMAGEVK-74) I/Q signals

I have a millimeter wave radar (IMAGEVK-74). I am new to signal processing and I need to generate images from the radar data. The specifications of the radar are- it has a 20 transmitter 20 receivers ...
user70096's user avatar
1 vote
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37 views

Calculating k-space coverage from antenna positions

I work with radar and I want to understand which spatial frequencies I can measure, i.e. the k-space coverage, given a set of coordinates of transmitter-receiver combinations. The ideal coverage for a ...
DominikR's user avatar
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Why does applying Fourier Transform on point Spread Function yield h(t) which is complex-valued

I wanted to understand why this text talks about applying the Fourier transform on H(f) to obtain h(t). I view Fourier transform as moving from the time or spatial domain to the frequency / spatial ...
Hari's user avatar
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Cannot understand a simple example in Phased Array System Toolbox (MATLAB), regarding FREE SPACE

I am learning about radar and signal processing. I try to run a simple code snippet provided on Mathwork's official website It is just about FREE SPACE, which I think you know very well, but I am new ...
pej's user avatar
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1 vote
0 answers
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SAR Doppler centroid estimation

I read book Comming Wong Digital Processing of Synthetic apperture, where they describe in detail various metods for estimation doppler centroid. Fractional part and resolve ambiguous. But in tne ...
J Jack's user avatar
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100 views

Cfar Algorithm Implementation

I am trying to implementation Cfar algorithm to our radar signal processing algorithm. I obtained some output but I want to be sure that is right. Cfar algorithm's output below like, I'm interpreting ...
Paroz's user avatar
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1 answer
233 views

How can I apply a phase shift to an LFM pulse?

I am modelling radar scenarios in python and am trying to make a model which retains phase information. To do so, I'm envisioning something which works like this: Generate samples of an LFM waveform ...
Jim's user avatar
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171 views

How to plot a sawtooth chirp waveform using an array of frequency and time for an FMCW radar?

Before switching to use sawtooth I was using sine wave but in sine wave high frequency content was not clearly visible, But I don't have any experience with using sawtooth waveforms. I am going to ...
Raj Patil's user avatar
1 vote
3 answers
238 views

FMCW Radar - What's wrong with the transmitted signal model?

I am new to FMCW radar and trying to plot the transmit signal over time. As you know, the transmitted signal is modelled as: $$s(t) = cos(2\pi f_c t + \pi S^2),$$ where $S = BW/T_{chirp}$ is the slope,...
pej's user avatar
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2 votes
1 answer
830 views

Can you please help me in generating a chirp signal in GNU radio by creating a module of your own?

I am currently working on a FMCW radar using a SDR I have done the simulations in python and am moving towards simulations on GNU radio. In python it was easy to generate a chirp, just use the scipy....
Raj Patil's user avatar
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0 answers
28 views

How to control the Cross-range of a scene for a fixed resolution in SAR image processing?

In order to image a scene with a certain resolution I would have to fly a certain distance. The longer the flight, the better the azimuth resolution. This is determined by the following formula $$\...
Hari's user avatar
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0 answers
42 views

Why does my range shift after applying Stolt interpolation?

I am working with an FMCW Radar Simulation, where I have generated 3 targets with slant ranges: 156m,137m 118m The distances can be computed based on the formula, Distance = (Bin_idx/Nrg * Fs) * (c / ...
Hari's user avatar
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1 vote
1 answer
151 views

Which probability density functions to use in a likelihood ratio test for the radar detection problem?

I am trying to understand the radar detection problem in the form of the generalized likelihood ratio test and am having a little trouble with understanding the noise distributions. Perhaps this will ...
Jim's user avatar
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46 views

Observing Artefacts along azimuth direction after applying RMA to FMCW radar data

I have simulated 3 scatterers for FMCW radar signal processing using Range Migration Algorithm. Background: The Range Migration algorithm steps are as follows: Applying Azimuth FFT on the raw data ...
Hari's user avatar
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2 answers
79 views

Synthetic Aperture Radar model: Ground reflected energy

My question is related to a theoretical part of the book: Digital Processing of Synthetic Aperture Radar Data, Algorithms and Implementation by I.G. Cumming et al. [Chapter 4. Equation 4.25 (for those ...
Lucas's user avatar
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0 answers
72 views

About generating MIMO FMCW IF Signal and angle detection

I want to detect some targets where their range, velocity and angle information can be given before creating the radar cube. Then using IF signal for MIMO FMCW radar I want to construct the radar cube....
esi's user avatar
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2 votes
0 answers
44 views

Beam Center Range for FMCW radar

I am provided with the following information: ...
Hari's user avatar
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0 votes
1 answer
47 views

Trimming of Azimuth Frequency Extent After Stolt Interpolation

The space-variant impulse response can be circumvented by collecting SAR data over a larger angular aperture than is strictly needed to achieve the desired azimuth resolution. From Carrara's text, it ...
Hari's user avatar
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2 votes
2 answers
587 views

Maximum Range of FMCW Radar

I am performing some simulations for FMCW radar for target detection. I am working with a dechirp on receive system. Therefore, the target distance can be determined from the Intermediate Frequency or ...
Hari's user avatar
  • 93
3 votes
2 answers
257 views

FMCW Radar timing of transmission and reception

I have a question regarding the implementation of FMCW radars that seems rather basic to me, but for some reason I am a bit unclear about this. So I understand that in FMCW radar, transmitter and ...
Lucas's user avatar
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0 votes
1 answer
75 views

Range Gating for FMCW Radars

I have a question regarding on how to select a particular range of interest for the dechirp-on-receive FMCW radar for application within Synthetic Aperture Radar signal processing. If RX01 is the ...
Hari's user avatar
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0 votes
0 answers
34 views

How can I plot the power spectra of a ST (Stratosphere Troposphere) Radar in MATLAB to estimate the doppler shift

Respected all, I am trying to plot the power spectra of a ST (Stratosphere Troposphere) Radar to estimate the doppler shift. I am able to obtain a 3D plot between range, FFT point and Power density ...
Shashank's user avatar
2 votes
0 answers
215 views

Ambiguity function volume

I find myself confused how two properties of the ambiguity function relate to one another. The properties in question are (presented here from wikipedia, but similar formulas can be found in books by ...
Narrava's user avatar
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0 answers
59 views

MIMO Radar - Using statistical properties of the Fourier transform phase for detection

I currently researching the phase (between real and imaginary part) of the fourier transformation. It seems that one can use it for detection. For the signal processing I use two fft transforms. One ...
magi's user avatar
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1 vote
1 answer
2k views

How to calculate the range bin size in FMCW radar?

In FMCW, we have range resolution calculated as delta_d = c/(2B), and dmax = fs * c/(2*S) where S is the slope. my understanding is numRangeBins = dmax / delta_d. However, in the post (range-doppler ...
Linda's user avatar
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2 votes
1 answer
912 views

unambiguous velocity $V_\max$ in radar doppler processing

In literature, $V_\max = \lambda\cdot \operatorname{PRF} / 2$; should it be $V_\max = \lambda \cdot \operatorname{PRF} / 4$, which would be consistent with FMCW $V_\max = \lambda / (4 \cdot T_c)$? ...
Linda's user avatar
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3 votes
1 answer
164 views

Ambiguity function information

For a course that i'm taking im asked a question about the ambiguity function of a FMCW radar. However i have not found a good source for reading about this so don't quite understand it. I get given ...
cooldanietje's user avatar
1 vote
0 answers
82 views

Conditions for FMCW signal reconstruction using Hilbert Transform

I have an In-phase signal collected by an FMCW radar. I am trying to reconstruct the analytical signal by applying the Hilbert Transform to the In-phase signal. Are there certain conditions that need ...
Hari's user avatar
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2 votes
1 answer
65 views

Is it possible to generate SAR like pictures with a non moving MIMO radar and static scene?

Recently I study radar alot and was wondering if there is a possibility to generate SAR like pictures with MIMO radar. Under the condition that the MIMO radar is not moving and the scene does not ...
jang's user avatar
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0 votes
1 answer
731 views

Using radar IQ data to detect motion

I have a 24GHz motion detector (SMR-333 website, sparse datasheet) that gives I and Q, without signal processing. How can I use these values to detect motion? I only need to detect if a person moves ...
NateS's user avatar
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2 votes
1 answer
1k views

Time shifting a signal in python

I am currently modeling FMCW (linear FM) and SFCW (stepped FM) chirps in python. For my project, I need to simulate those signals as a transmit chirp and a received one, scattered from point targets ...
Lucas's user avatar
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1 vote
0 answers
88 views

Deconvolution of a ground-penetrating radar signal for further convolution with a desired source signal

I am following the instructions of this paper (https://www.earthdoc.org/content/journals/10.3997/1873-0604.2003015) to process a ground-penetrating radar (GPR) signal (a discrete signal sampled at a ...
Luis Fraga's user avatar
1 vote
0 answers
20 views

Stepped Frequency Modulated Waveform Continuity issues [duplicate]

I want to generate a stepped frequency modulated waveform (SFMW), similar to a linear frequency modulated chirp. While approaching this, I wanted to consider the issue that there should be some ...
Lucas's user avatar
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0 votes
1 answer
124 views

Use FFT to compute only part of frequency response

I am working on a project in which I need to calculate the range of a target using an FMCW radar. Dependent on the target's range, I expect various beat frequencies to occur in the data from my ADC. I ...
CMH12's user avatar
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