FEAT: FRTM new methods and DOA new features

doc/changelog.d/6221.added.md

@@ -0,0 +1 @@
+Frtm new methods and doa new features

doc/styles/config/vocabularies/ANSYS/accept.txt

@@ -8,6 +8,7 @@ airgap
 (?i)Ansys
 API
 autosave
+beamforming
 brd
 busbar
 busbars

src/ansys/aedt/core/visualization/advanced/doa.py

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+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2021 - 2025 ANSYS, Inc. and/or its affiliates.
+# SPDX-License-Identifier: MIT
+#
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+import sys
+
+import numpy as np
+
+from ansys.aedt.core.generic.constants import SpeedOfLight
+from ansys.aedt.core.generic.general_methods import conversion_function
+from ansys.aedt.core.generic.general_methods import pyaedt_function_handler
+from ansys.aedt.core.visualization.plot.matplotlib import ReportPlotter
+
+current_python_version = sys.version_info[:2]
+if current_python_version < (3, 10):  # pragma: no cover
+    raise Exception("Python 3.10 or higher is required for direction of arrival (DoA) post-processing.")
+
+
+class DirectionOfArrival:
+    """
+    Class for direction of arrival (DoA) estimation using 2D planar antenna arrays
+    with coordinates in meters and user-defined frequency.
+    """
+
+    def __init__(self, x_position: np.array, y_position: np.array, frequency: float):
+        """
+        Initialize with antenna element positions in meters and signal frequency in Hertz.
+
+        Parameters
+        ----------
+        x_position : np.ndarray
+            X coordinates of the antenna elements in meters.
+        y_position : np.ndarray
+            Y coordinates of the antenna elements in meters.
+        frequency : float
+            Signal frequency in Hertz.
+        """
+        self.x = np.asarray(x_position)
+        self.y = np.asarray(y_position)
+        self.elements = len(self.x)
+        self.frequency = frequency
+        self.wavelength = SpeedOfLight / self.frequency
+        self.k = 2 * np.pi / self.wavelength
+
+        if self.elements != len(self.y):
+            raise ValueError("X and Y coordinate arrays must have the same length.")
+
+    @pyaedt_function_handler()
+    def get_scanning_vectors(self, azimuth_angles: np.ndarray) -> np.ndarray:
+        """
+        Generate scanning vectors for the given azimuth angles in degrees.
+
+        Parameters
+        ----------
+        azimuth_angles : np.ndarray
+            Incident azimuth angles in degrees.
+
+        Returns
+        -------
+        scanning_vectors : np.ndarray
+            Scanning vectors.
+        """
+        thetas_rad = np.deg2rad(azimuth_angles)
+        P = len(thetas_rad)
+        scanning_vectors = np.zeros((self.elements, P), dtype=complex)
+
+        for i in range(P):
+            scanning_vectors[:, i] = np.exp(
+                1j * self.k * (self.x * np.sin(thetas_rad[i]) + self.y * np.cos(thetas_rad[i]))
+            )
+
+        return scanning_vectors
+
+    @pyaedt_function_handler()
+    def bartlett(
+        self, data: np.ndarray, scanning_vectors: np.ndarray, range_bins: int = None, cross_range_bins: int = None
+    ):
+        """
+        Estimate the direction of arrival (DoA) using the Bartlett (classical beamforming) method.
+
+        Parameters
+        ----------
+        data : np.ndarray
+            Complex-valued array of shape (range_bins, elements), typically output from range FFT.
+            Each row represents the antenna data for a specific range bin.
+        scanning_vectors : np.ndarray
+            Complex matrix of shape (elements, num_angles), where each column corresponds to
+            a scanning vector for a different azimuth/elevation angle.
+        range_bins : int, optional
+            Number of range bins (rows of the output), defaults to the first dimension of `data`.
+        cross_range_bins : int, optional
+            Number of cross-range (angular) bins, defaults to the second dimension of `scanning_vectors`.
+
+        Returns
+        -------
+        np.ndarray
+            2D complex-valued array of shape (range_bins, cross_range_bins), representing the
+            power angular density (PAD) for each range bin and angle.
+        """
+
+        if range_bins is None:
+            range_bins = data.shape[0]
+        if cross_range_bins is None:
+            cross_range_bins = scanning_vectors.shape[1]
+
+        scale_factor = scanning_vectors.shape[1] / cross_range_bins
+        pad_output = np.zeros((range_bins, cross_range_bins), dtype=complex)
+
+        for n, range_bin_data in enumerate(data):
+            range_bin_data = np.reshape(range_bin_data, (1, self.elements))
+            correlation_matrix = np.dot(range_bin_data.T, range_bin_data.conj())
+
+            if correlation_matrix.shape[0] != correlation_matrix.shape[1]:
+                raise ValueError("Correlation matrix is not square.")
+            if correlation_matrix.shape[0] != scanning_vectors.shape[0]:
+                raise ValueError("Dimension mismatch between correlation matrix and scanning vectors.")
+
+            pad = np.zeros(scanning_vectors.shape[1], dtype=complex)
+            for i in range(scanning_vectors.shape[1]):
+                steering_vector = scanning_vectors[:, i]
+                pad[i] = steering_vector.conj().T @ correlation_matrix @ steering_vector
+
+            pad_output[n] = pad * scale_factor
+
+        return pad_output
+
+    def capon(
+        self, data: np.ndarray, scanning_vectors: np.ndarray, range_bins: int = None, cross_range_bins: int = None
+    ) -> np.ndarray:
+        """
+        Estimate the direction of arrival using the Capon (Minimum variance distortion less response)
+        beamforming method.
+
+        Parameters
+        ----------
+        data : np.ndarray
+            Complex-valued array of shape (range_bins, elements), typically output from range FFT.
+            Each row represents the antenna data for a specific range bin.
+        scanning_vectors : np.ndarray
+            Complex matrix of shape (elements, num_angles), where each column corresponds to
+            a scanning vector for a different azimuth/elevation angle.
+        range_bins : int, optional
+            Number of range bins (rows of the output), defaults to the first dimension of `data`.
+        cross_range_bins : int, optional
+            Number of cross-range (angular) bins, defaults to the second dimension of `scanning_vectors`.
+
+        Returns
+        -------
+        np.ndarray
+            2D real-valued array of shape (range_bins, cross_range_bins), representing the
+            Capon spatial spectrum (inverse of interference power) for each range bin and angle.
+        """
+
+        if range_bins is None:
+            range_bins = data.shape[0]
+        if cross_range_bins is None:
+            cross_range_bins = scanning_vectors.shape[1]
+
+        scale_factor = scanning_vectors.shape[1] / cross_range_bins
+        spectrum_output = np.zeros((range_bins, cross_range_bins), dtype=float)
+
+        for n, range_bin_data in enumerate(data):
+            range_bin_data = np.reshape(range_bin_data, (1, self.elements))
+            R = range_bin_data.T @ range_bin_data.conj()
+
+            if R.shape[0] != R.shape[1]:
+                raise ValueError("Correlation matrix is not square.")
+            if R.shape[0] != scanning_vectors.shape[0]:
+                raise ValueError("Dimension mismatch between correlation matrix and scanning vectors.")
+
+            try:
+                R_inv = np.linalg.inv(R)
+            except np.linalg.LinAlgError:
+                raise ValueError("Correlation matrix is singular or ill-conditioned.")
+
+            for i in range(cross_range_bins):
+                sv = scanning_vectors[:, i]
+                denom = np.conj(sv).T @ R_inv @ sv
+                spectrum_output[n, i] = scale_factor / np.real(denom)
+
+        return spectrum_output
+
+    @pyaedt_function_handler()
+    def music(
+        self,
+        data: np.ndarray,
+        scanning_vectors: np.ndarray,
+        signal_dimension: int,
+        range_bins: int = None,
+        cross_range_bins: int = None,
+    ) -> np.ndarray:
+        """
+        Estimate the direction of arrival (DoA) using the MUSIC method.
+
+        Parameters
+        ----------
+        data : np.ndarray
+            Complex-valued array of shape (range_bins, elements), typically output from range FFT.
+            Each row represents the antenna data for a specific range bin.
+        scanning_vectors : np.ndarray
+            Matrix of shape (elements, num_angles), where each column is a steering vector for a test angle.
+        signal_dimension : int
+            Number of sources/signals (model order).
+        range_bins : int, optional
+            Number of range bins to process. Defaults to `data.shape[0]`.
+        cross_range_bins : int, optional
+            Number of angle bins (scan directions). Defaults to `scanning_vectors.shape[1]`.
+
+        Returns
+        -------
+        np.ndarray
+            2D real-valued array of shape (range_bins, cross_range_bins),
+            representing the MUSIC spectrum for each range bin and angle.
+        """
+        if range_bins is None:
+            range_bins = data.shape[0]
+        if cross_range_bins is None:
+            cross_range_bins = scanning_vectors.shape[1]
+
+        output = np.zeros((range_bins, cross_range_bins), dtype=float)
+
+        for n, snapshot in enumerate(data):
+            snapshot = snapshot.reshape((1, self.elements))
+            R = np.dot(snapshot.T, snapshot.conj())
+
+            if R.shape[0] != R.shape[1]:
+                raise ValueError("Correlation matrix is not square.")
+            if R.shape[0] != scanning_vectors.shape[0]:
+                raise ValueError("Dimension mismatch between correlation matrix and scanning vectors.")
+
+            try:
+                eigenvalues, eigenvectors = np.linalg.eigh(R)
+            except np.linalg.LinAlgError:
+                raise np.linalg.LinAlgError("Failed to compute eigendecomposition (singular matrix).")
+
+            M = R.shape[0]
+            noise_dim = M - signal_dimension
+            idx = np.argsort(eigenvalues)
+            En = eigenvectors[:, idx[:noise_dim]]  # Noise subspace
+
+            spectrum = np.zeros(cross_range_bins, dtype=float)
+            for i in range(cross_range_bins):
+                sv = scanning_vectors[:, i]
+                denom = np.abs(sv.conj().T @ En @ En.conj().T @ sv)
+                spectrum[i] = 0.0 if denom == 0 else 1.0 / denom
+
+            output[n] = spectrum
+
+        return output
+
+    @pyaedt_function_handler()
+    def plot_angle_of_arrival(
+        self,
+        signal: np.ndarray,
+        doa_method: str = None,
+        field_of_view=None,
+        quantity_format: str = None,
+        title: str = "Angle of Arrival",
+        output_file: str = None,
+        show: bool = True,
+        show_legend: bool = True,
+        plot_size: tuple = (1920, 1440),
+        figure=None,
+    ):
+        """Create angle of arrival plot.
+
+        Parameters
+        ----------
+        signal : np.ndarray
+            Frame number. The default is ``None``, in which case all frames are used.
+        doa_method : str, optional
+            Method used for direction of arrival estimation.
+            Available options are: ``"Bartlett"``, ``"Capon"``, and ``"Music"``.
+            The default is ``None``, in which case ``"Bartlett"`` is selected.
+        field_of_view : np.ndarray, optional
+            Azimuth angular span in degrees to plot. The default is from -90 to 90 dregress.
+        quantity_format : str, optional
+            Conversion data function. The default is ``None``.
+            Available functions are: ``"abs"``, ``"ang"``, ``"dB10"``, ``"dB20"``, ``"deg"``, ``"imag"``, ``"norm"``,
+            and ``"real"``.
+        title : str, optional
+            Title of the plot. The default is ``"Range profile"``.
+        output_file : str or :class:`pathlib.Path`, optional
+            Full path for the image file. The default is ``None``, in which case an image in not exported.
+        show : bool, optional
+            Whether to show the plot. The default is ``True``.
+            If ``False``, the Matplotlib instance of the plot is shown.
+        show_legend : bool, optional
+            Whether to display the legend or not. The default is ``True``.
+        plot_size : tuple, optional
+            Image size in pixel (width, height).
+        figure : :class:`matplotlib.pyplot.Figure`, optional
+            An existing Matplotlib `Figure` to which the plot is added.
+            If not provided, a new `Figure` and `Axes` objects are created.
+            Default is ``None``.
+
+        Returns
+        -------
+        :class:`ansys.aedt.core.visualization.plot.matplotlib.ReportPlotter`
+            PyAEDT matplotlib figure object.
+
+        Examples
+        --------
+        >>> from ansys.aedt.core.visualization.advanced.doa import DirectionOfArrival
+        >>> import numpy as np
+        >>> freq = 10e9
+        >>> signal_angle = 30
+        >>> num_elements_x = 4
+        >>> num_elements_y = 4
+        >>> d = 0.015
+        >>> x = np.tile(np.arange(num_elements_x) * d, num_elements_y)
+        >>> y = np.repeat(np.arange(num_elements_y) * d, num_elements_x)
+        >>> k = 2 * np.pi * freq / 3e8
+        >>> signal_vector = np.exp(
+        ...     1j * k * (x * np.sin(np.radians(signal_angle)) + y * np.cos(np.radians(signal_angle)))
+        ... )
+        >>> signal_snapshot = signal_vector + 0.1 * (
+        ...     np.random.randn(len(signal_vector)) + 1j * np.random.randn(len(signal_vector))
+        ... )
+        >>> doa = DirectionOfArrival(x, y, freq)
+        >>> doa.plot_angle_of_arrival(signal_snapshot)
+        >>> doa.plot_angle_of_arrival(signal_snapshot, doa_method="MUSIC")
+        """
+
+        data = np.array([signal])
+
+        if field_of_view is None:
+            field_of_view = np.linspace(-90, 90, 181)
+
+        if doa_method is None:
+            doa_method = "Bartlett"
+
+        scanning_vectors = self.get_scanning_vectors(field_of_view)
+
+        if doa_method.lower() == "bartlett":
+            output = self.bartlett(data, scanning_vectors)
+        elif doa_method.lower() == "capon":
+            output = self.capon(data, scanning_vectors)
+        elif doa_method.lower() == "music":
+            output = self.music(data, scanning_vectors, 1)
+        else:
+            raise ValueError(f"Unknown {doa_method} method.")
+
+        if quantity_format is None:
+            quantity_format = "dB20"
+
+        output = conversion_function(output, quantity_format)
+
+        new = ReportPlotter()
+        new.show_legend = show_legend
+        new.title = title
+        new.size = plot_size
+
+        x = field_of_view
+        y = output.T
+
+        legend = f"DoA {doa_method}"
+        curve = [x.tolist(), y.tolist(), legend]
+
+        # Single plot
+        props = {"x_label": "Azimuth (°)", "y_label": "Power"}
+        name = curve[2]
+        new.add_trace(curve[:2], 0, props, name)
+        new.x_margin_factor = 0.0
+        new.y_margin_factor = 0.2
+        _ = new.plot_2d(None, output_file, show, figure=figure)
+        return new