getClutterGenerator
Description
returns a clutter generator object cluttergen
= getClutterGenerator(scenario
,radar
)cluttergen
for the
radar
belonging to the radar scenario scenario
.
Examples
Create Clutter Object with Two Clutter Regions
Generate clutter from a surface having two clutter regions. Start by creating a radarDataGenerator
. Use a radar frequency of 1 GHz, a 100 meter range resolution, a 5 kHz pulse repetition frequency (PRF), and 128 pulses. The beam is symmetric with a 4 degree two-sided beamwidth in azimuth and elevation.
fc = 1e9; rangeRes = 100; prf = 5e3; numPulses = 128; beamwidth = 4;
Use the PRF and number of pulses to calculate the nominal Doppler and range-rate resolution. The radar will update once each coherent processing interval (CPI).
dopRes = prf/numPulses; lambda = freq2wavelen(fc); rangeRateRes = dop2speed(dopRes,lambda)/2; cpiTime = numPulses/prf; rdr = radarDataGenerator(1,'No scanning','UpdateRate',1/cpiTime, ... 'DetectionMode','Monostatic','TargetReportFormat','Detections', ... 'DetectionCoordinates','Scenario', ... 'HasINS',true,'HasElevation',true,'HasFalseAlarms',false, ... 'HasNoise',false,'HasRangeRate',true, ... 'HasRangeAmbiguities',true,'HasRangeRateAmbiguities',true, ... 'CenterFrequency',fc,'FieldOfView',beamwidth, ... 'AzimuthResolution',beamwidth,'ElevationResolution', ... beamwidth,'RangeResolution', ... rangeRes,'RangeRateResolution',rangeRateRes, ... 'ReferenceRange',20e3,'ReferenceRCS',0, ... 'DetectionProbability',0.9);
Create a scenario using the radarScenario
object, setting the update rate to zero so that the update interval is derived from sensors in the scene.
scenario = radarScenario('UpdateRate',0,'IsEarthCentered',false);
Now create the scenario surface. Choose a constant-gamma reflectivity model with a gamma value appropriate for flatland. This gamma value can be found using the surfacegamma
function. Using this value, create a surfaceReflectivityLand
object to add to a LandSurface
using the RadarReflectivity
property.
gammaDB = surfacegamma('Flatland'); refl = surfaceReflectivityLand('Model','ConstantGamma', ... 'Gamma',gammaDB); landSurface(scenario,'RadarReflectivity',refl);
Add two clutter regions to the scenario. Use the clutterGenerator
object function to construct a clutter generator and enable clutter generation for the radar. The Resolution
property defines the nominal spacing of clutter patches. Set this to be 1/5th of the range resolution to get multiple clutter patches per range gate. Set the range limit to 20 km. UseBeam
indicates if clutter generation should be performed automatically for the mainlobe of the antenna pattern.
cluttergen = clutterGenerator(scenario,rdr,'Resolution', ... rangeRes/5,'RangeLimit',20e3,'UseBeam',true); rgn1 = ringClutterRegion(cluttergen,1000,10000,30,45); rgn2 = ringClutterRegion(cluttergen,1000,10000,30,105);
The getClutterGenerator
function displays the two ring-shaped clutter regions belonging to the scenario.
getClutterGenerator(scenario,rdr)
ans = ClutterGenerator with properties: ScattererDistribution: "Uniform" Resolution: 20 Regions: [1x2 radar.scenario.RingClutterRegion] UseBeam: 1 UseShadowing: 1 RangeLimit: 20000 Radar: [1x1 radarDataGenerator] SeedSource: "Auto"
Input Arguments
scenario
— radar scenario
radarScenario
object
Radar scenario, specified as a radarScenario
object.
radar
— Radar
radarDataGenerator
object | radarTransceiver
object
Radar, specified as a radarDataGenerator
or radarTransceiver
object.
Output Arguments
cluttergen
— Clutter generator object
ClutterGenerator
object
Clutter generator, returned as ClutterGenerator
object.
Version History
Introduced in R2022a
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