rcsSignature RCS pattern change for radarTransceiver data generation

Hi!

I'm working with radarTransceiver object and I came across an issue, when I want to change the RCS of my target to achieve weaker signal nothing happens. I've tried different configurations of rcsSignature patterns, but nothing works, the signal is always with the same SNR.

Am I missing something?

Example code is in attachement with my RCS pattern modifications.

I want to achieve the smaller ampitude of the received signal reflected from taget 1.

Thank you for you help!

Answer 1

[Arkadiusz Czuba]

I have found the solution.

There was an error in tgt structure instead of:

tgt1 = struct( ...
    'Position', [0 5e3 0], ...
    'Velocity', [0 0 0], ...
    'RCS', rcs_pattern1);

Should be:

tgt1 = struct( ...
    'Position', [0 5e3 0], ...
    'Velocity', [0 0 0], ...
    'Signatures', rcs_pattern1);

Answer 2

[Umar]

To achieve a weaker signal in the radarTransceiver object, you need to modify the RCS pattern of the target correctly. Looking at the provided code, there are a few modifications that need to be made to achieve the desired result.

Modify the RCS Pattern: Currently, the RCS pattern is defined as a single value for each target (pattern_tgt1 and pattern_tgt2). To create a pattern with weaker signal amplitude, you can use a matrix of values instead of a single value. Each element in the matrix represents the RCS value at a specific azimuth and elevation angle. Uncomment the lines that define pattern_tgt1 and pattern_tgt2 as matrices and comment out the lines that define them as single values. This will allow you to specify different RCS values for different angles. For example, you can use the following code to define pattern_tgt1 and pattern_tgt2 as matrices with weaker signal amplitudes:

pattern_tgt1 = -40*ones(numel(el), numel(az)); pattern_tgt2 = 0*ones(numel(el), numel(az));

Update RCS Patterns for the Targets: After modifying the RCS pattern matrices, update the RCS patterns for tgt1 and tgt2 using the rcsSignature function. Replace the lines that define rcs_pattern1 and rcs_pattern2 with the following code:

rcs_pattern1 = rcsSignature('Pattern', pattern_tgt1); % -40 dBsm for tgt1 rcs_pattern2 = rcsSignature('Pattern', pattern_tgt2); % 0 dBsm for tgt2

Run the Simulation: After making the above modifications, run the simulation again to observe the changes in the received signal amplitude.The updated RCS patterns should result in a weaker signal for tgt1 compared to tgt2.By correctly modifying the RCS pattern of the target, you should be able to achieve a weaker signal in the radarTransceiver object. Make sure to update the RCS pattern matrices and re-run the simulation to observe the changes in the received signal amplitude.

I hope this will help you out my friend.

[Arkadiusz Czuba]

Unfortunately, I already tried ChatGPT's advice, which is why I commented out this code, so no, this code does not improve the results, the signal is still not weaker.

I attached the updated code here.

[Umar]

The RCS patterns are currently being defined as single values (-40 and 0) instead of matrices. To achieve varying RCS values across different angles, you need to define the RCS patterns as matrices.

[Umar]

% Define the azimuth and elevation angles 
az = -180:0.5:180; el = -90:0.5:90;

% Define the RCS patterns for the targets 
pattern_tgt1 = -40 * ones(numel(el), numel(az)); % -40 dBsm for tgt1 
pattern_tgt2 = 0 * ones(numel(el), numel(az)); % 0 dBsm for tgt2

% Create the RCS signature objects 
rcs_pattern1 = rcsSignature('Pattern', pattern_tgt1); 
rcs_pattern2 = rcsSignature('Pattern', pattern_tgt2);

% Create the target structures with the updated RCS patterns 
tgt1 = struct( ... 
    'Position', [0 5e3 0], ... 
    'Velocity', [0 0 0], ... 
    'RCS', rcs_pattern1); 
tgt2 = struct( ... 
    'Position', [10e3 0 0], ... 
    'Velocity', [0 0 0], ... 
    'RCS', rcs_pattern2);

[Umar]

Sorry, I am kind of poor, cannot afford Matlab license. As Jesus was poor but still liked to help out people. So, I hope this will help you out my friend.