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Detection

Target detection, CFAR, 2-D CFAR, ROC curves, radar equation, sonar equation

The Phased Array System Toolbox™ includes System objects and Simulink® blocks for performing matched filtering, constant false alarm rate (CFAR) detection in one or two dimensions, stretch-processing pulse compression and coherent and noncoherent pulse integration. Utility functions let you compute and visualize receiver operating characteristic (ROC) curves for various signal-to-noise ratio (SNR) levels or probabilities of false alarm. A suite of functions and an app let you perform radar analysis using the radar equation. You can estimate, for example, received SNR or maximum target detection range. A similar set of capabilities are provided for the sonar equation. Blake charts let you visualize radar coverage.

System Objects

phased.CFARDetectorConstant false alarm rate (CFAR) detector
phased.CFARDetector2DTwo-dimensional CFAR detector
phased.MatchedFilterMatched filter
phased.StretchProcessorStretch processor for linear FM waveform
phased.TimeVaryingGainTime varying gain control

Blocks

CFAR DetectorConstant false alarm rate (CFAR) detector
2-D CFAR DetectorTwo-dimensional constant false alarm rate (CFAR) detector
Stretch ProcessorStretch processor for linear FM waveforms
Time Varying GainTime varying gain (TVG) control
Pulse IntegratorCoherent or noncoherent pulse integration
Dechirp MixerDechirping operation on input signal
Matched FilterMatched filter

Functions

albersheimRequired SNR using Albersheim’s equation
dechirpPerform dechirp operation on FMCW signal
npwgnthreshDetection SNR threshold for signal in white Gaussian noise
pulsintPulse integration
rocpfaReceiver operating characteristic curves by false-alarm probability
rocsnrReceiver operating characteristic curves by SNR
shnidmanRequired SNR using Shnidman’s equation
blakechartRange-angle-height (Blake) chart
bw2rangeConvert bandwidth to range resolution
physconstPhysical constants
radareqpowPeak power estimate from radar equation
radareqrngMaximum theoretical range estimate
radareqsnrSNR estimate from radar equation
radarvcdVertical coverage diagram
range2bwConvert range resolution to required bandwidth
bw2rangeConvert bandwidth to range resolution
physconstPhysical constants
range2bwConvert range resolution to required bandwidth
range2tlCompute underwater sound transmission loss from range
sonareqslCompute source level using the sonar equation
sonareqsnrCompute SNR using the sonar equation
sonareqtlCompute transmission loss using the sonar equation
tl2rangeCompute range from underwater transmission loss

Apps

Radar Equation CalculatorEstimate maximum range, peak power, and SNR of a radar system
Sonar Equation Calculator Estimate maximum range, SNR, transmission loss and source level of a sonar system
Sensor Array AnalyzerAnalyze beam pattern of linear, planar, and conformal sensor arrays

Topics

Detection and Estimation

Neyman-Pearson Hypothesis Testing

In phased-array applications, you sometimes need to decide between two competing hypotheses to determine the reality underlying the data the array receives.

Receiver Operating Characteristics

Receiver operating characteristic (ROC) curves describe a detector’s performance by relating probability of false alarm to probability of detection.

Monte-Carlo ROC Simulation

Generate an ROC curve using a Monte-Carlo simulation.

Matched Filtering

Matched filtering increases SNR and improves detection.

Stretch Processing

Stretch processing, deramp, dechirp

FMCW Range Estimation

FMCW dechirp

Range-Doppler Response

Range-Doppler processing and range-Doppler maps

Constant False-Alarm Rate (CFAR) Detectors

CFAR detectors apply the Neyman-Pearson criterion to target detection. The detectors estimate noise statistics from data.

Phased Array Systems

Overview of Basic Workflow

This section provides an introduction to the end-to-end radar simulation.

End-to-End Radar System

The basic toolbox workflow is applied to a monostatic radar system consisting of a single antenna.

Radar Equation

Radar Equation

Radar equation for peak power, range, and SNR in monostatic and bistatic configurations

Standards and Conventions

This section introduces the concept of baseband signals and defines the local and global coordinate systems used in the toolbox.

Units of Measure and Physical Constants

Phased Array System Toolbox uses the International System of Units.

Sonar Equation

Sonar Equation

The sonar equation is used in underwater signal processing to relate received signal power to transmitted signal power for one-way or two-way sound propagation.

Doppler Effect for Sound

The Doppler effect is the change in the observed frequency of a source due to the motion of either the source or receiver or both.

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