How to define SweepSlope parameter of phased.Ran​geAngleRes​ponse object

Below are the settings I'm using to create a phased.RangeAngleRresponse object. My assumption is the SweepSlope should just be the bandwidth of my LFM pulse divided by the pulse width. Is this a correct assumption?

response = phased.RangeAngleResponse(...
    'RangeMethod','FFT',...
    'SensorArray',MosaicArray,...
    'OperatingFrequency',fc,...
    'ElevationAngleSource','Property',... 
    'ElevationAngle',0,...     
    'SampleRate',fs,...   
    'SweepSlope',bw/tau,...
    'ReferenceRangeCentered',false,...
    'ReferenceRange',0,...
    'RangeWindow','Taylor',...
    'RangeSidelobeAttenuation',30,...
    'DechirpInput',true);

Answer 1

[Prathamesh]

Hi,

I understand that you want to know about “Sweep slope” parameter in the “phased.RangeAngleResponse” object.

Refer to the pointers explaining “sweep slope” parameter:

1. The sweep slope is the rate of change of frequency with respect to time during the frequency sweep of the LFM waveform.
2. In LFM waveforms, the frequency increases or decreases linearly over time, resulting in a linear chirp. The bandwidth of the LFM pulse is determined by the total frequency span covered during the pulse duration.
3. The sweep slope represents the rate of change of frequency over time, while the bandwidth represents the total frequency span covered by the pulse.
4. In the “phased.RangeAngleResponse” function in MATLAB, the “SweepSlope” parameter should be set to the desired rate of change of frequency during the frequency sweep of the LFM waveform.
5. The bandwidth and pulse width can be set independently using the appropriate parameters of the “LinearFMWaveform” object.

Please refer the documentation links attached below in order to get more information on “sweep slope”, bandwidth and pulse width.

https://www.mathworks.com/help/phased/ref/phased.rangeangleresponse-system-object.html

https://www.mathworks.com/help/phased/ug/linear-frequency-modulated-pulse-waveforms.html