Interpretation of paths.interactions

[abidur0177]

Hello everyone,
I recently started working with the Sionna RT module. After creating the scene, I defined all the parameters to calculate the ray-tracing paths between the transmitter and receiver. I introduced velocity to my receiver, which is mounted on a car, as follows:

Add motion to the car and Rx

scene.get("car01").velocity = [0, 20, 0]
scene.get("rx").velocity = [0, 20, 0]

Then, the paths were calculated with the following parameters:
p_solver = PathSolver()

Compute propagation paths

paths = p_solver(scene=scene,
max_depth=5,
los=True,
specular_reflection=True,
diffuse_reflection=True,
refraction=False,
synthetic_array=False,
seed=41)

My point is how to interpret the paths interaction matrix, as it is multidimensional as shown below.

code: print("Path interaction (0=LoS, 1=Specular reflection): ", paths.interactions.numpy())

output: Path interaction (0=LoS, 1=Specular reflection):
[[[[[[0 1 1 1 1 1]]]
[[[0 1 1 1 1 1]]]]]
[[[[[0 0 1 0 1 0]]]
[[[0 0 1 0 1 0]]]]]
[[[[[0 0 0 0 0 0]]]
[[[0 0 0 0 0 0]]]]]
[[[[[0 0 0 0 0 0]]]
[[[0 0 0 0 0 0]]]]]
[[[[[0 0 0 0 0 0]]]
[[[0 0 0 0 0 0]]]]]]

code: print(np.shape(paths.interactions))

output: (5, 1, 2, 1, 1, 6)

[faycalaa]

Hi @abidur0177,

As indicated in the API documentation, the Paths.interactions tensor has the shape [max_depth, num_rx, num_rx_ant, num_tx, num_tx_ant, num_paths].

Could you please clarify what you need help with?

[abidur0177]

Hi @faycalaa,
Thanks for your prompt reply. Now it makes sense.