Pulse-Doppler signal processing

Doppler CFAR detection processingPulse-Doppler signal processing detailed explanation
Pulse-Doppler signal processing is a radar and CEUS performance enhancement strategy that allows small high-speed objects to be detected in close proximity to large slow moving objects.wikipedia
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Radar

radar stationradarsradar system
Pulse-Doppler signal processing is a radar and CEUS performance enhancement strategy that allows small high-speed objects to be detected in close proximity to large slow moving objects.
The signal can also be split among multiple filters for pulse-Doppler signal processing, which reduces the noise floor by the number of filters.

Pulse-Doppler radar

Dopplerpulse-Dopplerpulse doppler
This signal processing strategy is used in pulse-Doppler radar and multi-mode radar, which can then be pointed into regions containing a large number of slow-moving reflectors without overwhelming computer software and operators.
* Pulse-Doppler signal processing detailed explanation

Moving target indication

moving target indicatorground moving target indicationMTI
Other signal processing strategies, like moving target indication, are more appropriate for benign clear blue sky environments.
Pulse-Doppler signal processing is required to achieve greater sub-clutter visibility.

Contrast-enhanced ultrasound

Agitated saline contrast testAgitated saline testASCS
Pulse-Doppler signal processing is a radar and CEUS performance enhancement strategy that allows small high-speed objects to be detected in close proximity to large slow moving objects.

Doppler ultrasonography

Doppler ultrasoundDopplerduplex ultrasonography
It is also used to measure blood flow in Doppler ultrasonography.

Pulse repetition frequency

PRFpulse repetition frequenciesmedium pulse repetition frequency
Transmit pulses are sent at the pulse repetition frequency.

Phase modulation

phase modulatedPMphase-modulated
This disruption causes some of the transmit energy to be reflected back to the radar antenna or transducer, along with phase modulation caused by motion.

Heterodyne

heterodyningHeterodyne detectionfrequency shifting
The same tone that is used to generate the transmit pulses is also used to down-convert the received signals to baseband.

Baseband

baseband signalbase bandcellular baseband
The same tone that is used to generate the transmit pulses is also used to down-convert the received signals to baseband.

Window function

Hamming windowwindow functionswindowing
* Detailed explanation of windowing

Matrix (mathematics)

matrixmatricesmatrix theory
These samples are organized into the m x n matrix of time domain samples shown in the top half of the diagram.

Time domain

time-domaintimetime coordinates
These samples are organized into the m x n matrix of time domain samples shown in the top half of the diagram.

Frequency domain

frequency-domainFourier spaceFourier domain
Time domain samples are converted to frequency domain using a digital filter.

Fast Fourier transform

FFTFast Fourier Transform (FFT)Fast Fourier Transforms
This usually involves a fast Fourier transform (FFT).

Monopulse radar

monopulsemonopulse technique
For monopulse radar, signal processing is identical for the main lobe and sidelobe blanking channels.

Main lobe

lobesmain beampoint their antennas
For monopulse radar, signal processing is identical for the main lobe and sidelobe blanking channels.

Range ambiguity resolution

Range ambiguity resolution detailed explanationrange ambiguity resolution process
The sorted detections are processed with a range ambiguity resolution algorithm to identify the true range and velocity of the target reflection.

Modulo operation

modulomodmodulus
Range and speed of the target are folded by a modulo operation produced by the sampling process.

Ambiguity resolution

Ambiguity resolution detailed explanationAmbiguity resolution process explanation
* Ambiguity resolution process explanation

Frequency ambiguity resolution

ambiguous velocityFrequency ambiguity resolution detailed explanationFrequency ambiguity resolution process explanation
* Frequency ambiguity resolution process explanation

Radar jamming and deception

jammingradar jammingjammer
Invalid signals include microwaves made by sources separate from the transmitter, such as radar jamming and deception.

Cartesian coordinate system

Cartesian coordinatesCartesian coordinateCartesian
During track, the XYZ position of the reflector is determined using a Cartesian coordinate system, and the XYZ velocity of the reflector is measured to predict future position.

Kalman filter

Kalman filteringunscented Kalman filterInformation Filter
This is similar to the operation of a Kalman filter.

Polar coordinate system

polar coordinatespolarpolar coordinate
The radar uses a polar coordinate system.

Phase-locked loop

PLLphase locked loopPLLs
Doppler frequency provides an additional feedback signal similar to the feedback used in a phase-locked loop.