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Questions tagged [radar]

Anything related to RADAR (RAdio Detection And Ranging) systems, their operations and circuits. RADAR systems are used to detect and locate a target by sweeping a beam of microwaves across a region of space and detecting echo signals reflected by the target.

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Creating a Range Profile

I am relatively new to the radar/signal processing community. However, my team has been struggling in developing a range profile in our programming. Here are the details for a NI LabVIEW forum I ...
Victor Ramirez's user avatar
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A question on radar cross section of rain by using radar reflectivity factor

The question is one of the past exam papers of the RADAR 1 course given in TUDelft, unfortunately, solutions are not provided to the past paper yet. The question: What will be the radar cross-section ...
cn_97's user avatar
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Can traffic counting be done with just doppler radar?

I'm planning on using radar to count car traffic on a slow speed road. What I'm wondering is if I should expect doppler radar to be good enough to get an accurate count? Alternatively I could also use ...
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Pulse Doppler radar system simulation using MATLAB

How to code this project in MATLAB I'd tried coding this project (prob. 3-2, third paragraph) in MATLAB through this tutorial: Doppler Shift and Pulse-Doppler Processing I'd changed PRF to 100 and ...
Ali Ent's user avatar
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HB100 range extension with dish antenna

I have interfaced an HB100 sensor with an ATMega microcontroller. It easily detects my hand movement upto 5-6" away only. I want to extend the range of the sensor so that it detects movement upto ...
Sidk's user avatar
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Radar correlators and matched filters

I'm trying to understand the real-world construction of 1950's radar correlators. The articles on the topic I have seen so far are jargon-filled explanations with no real-world examples. Does anyone ...
Maury Markowitz's user avatar
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Chirp pulse compression as described in Stimson's book

I reference the below diagram, from Stimson's Airborne Radar, 2nd Ed. In the text he discusses how the frequency increases linearly throughout the duration of tau. The sketch of the frequency x time ...
fpd011's user avatar
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Basic question about radar

I am learning about automotive radars and have a very basic question about them. If two or more cars on a road have the same radar, using the same radar tech (e.g. CWFM radar) how will one car's radar ...
Radar's user avatar
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Range Profile in Radar System

I am slightly confused on the range profile I am obtaining from my SCFW radar dataset. I am understanding of how fftshift works in shifting positive and negative frequency components to be centered ...
Victor Ramirez's user avatar
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154 views

Uniform circular array (UCA) beamforming using FFT

As far as I know, conventional beamforming using FFT can return a range-angle map. However, this only works with a uniform linear array (ULA). I'm wondering if the same approach works for UCA. I guess ...
dondon's user avatar
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Typical power reflected off wall/window/wooden shelves etc

For interference purposes, I would like to quantify how much signal power I would receive back when my transmitted signal is reflected off an object (a wall, glass window, wooden shelf) at a distance ...
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How does stretch processing work for SFCW?

I've been reading about FMCW radar, and I understand that a chirped signal can be de-chirped by mixing it with a copy of itself, which yields a beat frequency which is much easier to process and is ...
user201537's user avatar
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Pulsed Power Charging Resistor and Choke

I am currently attempting to build a pulsed power supply that requires an 8 H inductor to produce 50 kV 17 A square pulses with widths of 100 uS. Please see the attached schematic for more details (...
t1r3d's user avatar
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Measured doppler shift error biggest on direct flight on target

Following scenario: There is a radar on a plane which emits a CW Signal and outputs the measured doppler shifts from the reflection of a static target. I can see from the data, that the error of the ...
OcK's user avatar
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Superheterodyne receiver with voltage controlled oscillator

I'm new in electronics and I want to create a FM receiver that performs a product of the received RF signal and a local signal (the local signal is also frequency modulated with a Voltage Controlled ...
Mehdi asselman's user avatar
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SAR and ISAR sampling time

I'm seeking insight into the typical values of sampling times or refresh rates in radar systems. Specifically, I want to understand the time interval a radar operator must wait to receive new output ...
matteogost's user avatar
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How is Doppler beam sharpening and synthetic aperture forming the same thing?

There's a quote here from Carl Wiley, the inventor of synthetic aperture radar: "I had the luck to conceive of the basic idea, which I called Doppler Beam Sharpening (DBS), rather than Synthetic ...
Robbie Mallett's user avatar
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SAR: Why can images have complex pixels?

I come from an astronomical long-baseline interferometry background, where images are synthesized from sampled complex visibilities (Fourier components). LBI and polarization can be combined when ...
Nick Elias's user avatar
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FMCW or FSK radar signal processing using an Arduino Nano

I have been trying to build a car detection system with range measurement using an Arduino Nano, an AgilSense AP88 (this provides I/Q output, butI am using only the I output,) and an MPU4725 DAC (...
Magum23's user avatar
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Is it possible to couple Tx signal to RTL-SDR Rx signal for a FMCW radar?

Above one can see a typical (AFE) diagram for a FMCW. Other block diagrams I found include the processing blocks and and so on as well, but my question rests on the following: can I mix the TX and RX ...
Nick S.'s user avatar
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What is the bandwidth of a radar operating at 5 GHz?

This is the question I have been working on recently. I am trying to figure out how the time-bandwidth product is calculated. If anyone can send me any useful links that I can learn from I'd be very ...
Maxim Kasnedelchev's user avatar
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Using LIDAR in a 360-degree configuration

(I do not know an appropriate place for this on Stack Exchange. There does not appear to be any groups dedicated to LIDAR or ranging, so this will do for now. Please let me know if there is a better ...
HFOrangefish's user avatar
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2 answers
113 views

Why does an isotropic antenna becomes anisotropic inside a phased array (mutual coupling neglected)?

in this paper the following statement is written: An area A is allotted to each element in the infinite array. This is the maximum area available to each element, and is usually greater than the ...
Kinka-Byo's user avatar
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Low Voltage Oscillation in OpAmp Circuit

I have a small signal from a radar sensor (in the range of 300 µV) which I want to amplify to something I can reliably measure. Fortunately the application notes of the sensor provide a recommended ...
Jocobes's user avatar
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Building a 77GHz Band FMCW Radar with 0.25 Degree Angular Resolution

First some context. My group recently acquired some hardware for a radar related project, specifically a Texas Instrument AWR1843Boost (https://www.ti.com/tool/AWR1843BOOST) and a Texas Instruments ...
lightsforceps's user avatar
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113 views

Radar system for micro meter accuracy

I need a radar system to sense a movable object within [0..150 meter] range. The desired accuracy is around 100 micron. However, at far distance 1 mm could be fine. As far as I read, 3D Lidar systems ...
Humam Helfawi's user avatar
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Interpretation of FFT FMCW Doppler radar results

After a lot of research and help from the users here, I managed to do some FFT and signal processing in my first time in my life :) I have got the following figure, which shows one peak frequency, ...
Andre Ahmed's user avatar
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289 views

Getting the velocity in Radar FMCW

I have managed to get the frequency (the beat) frequency from an FMCW. Here is a screen shot of a wall that's detected by the Radar. I performed an FFT of complex I,Q data. My questions are 1. How ...
Andre Ahmed's user avatar
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110 views

How to find stepped frequency continuous wave gpr range?

As far as I know, the range of a sfcw (stepped frequency continuous wave) GPR is affected by bandwidth and number of frequency steps. However, when playing with Matlab's Radar Waveform Analyzer, I ...
VolkanOzcan's user avatar
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1 answer
94 views

Vehicle tracking and direction processing

Im trying to find a good way for tracking vehicles. Its like counting all the vehicles (cars, motor cycle or any vehicles)through a point on the road. Also it needs to count like how many in total and ...
Sandeep Thomas's user avatar