.. note::
    :class: sphx-glr-download-link-note

    Click :ref:`here <sphx_glr_download_auto_examples_plot_4_1_3_chirps_ambifunb.py>` to download the full example code
.. rst-class:: sphx-glr-example-title

.. _sphx_glr_auto_examples_plot_4_1_3_chirps_ambifunb.py:


==============================================================
Narrow Band Ambiguity Function of Chirps with Different Slopes
==============================================================

This example demonstrates the narrow band ambiguity function (AF) of a signal
composed of two chirps with Gaussian amplitude modulation but havind linear
frequency modulations with different slopes. Note that the AF interference
terms are located away from the origin.

Figure 4.13 from the tutorial.



.. image:: /auto_examples/images/sphx_glr_plot_4_1_3_chirps_ambifunb_001.png
    :class: sphx-glr-single-img





.. code-block:: default


    from tftb.generators import fmlin, amgauss
    from tftb.processing.ambiguity import narrow_band
    import numpy as np
    import matplotlib.pyplot as plt

    n_points = 64
    sig1 = fmlin(n_points, 0.2, 0.5)[0] * amgauss(n_points)
    sig2 = fmlin(n_points, 0.3, 0)[0] * amgauss(n_points)
    sig = np.hstack((sig1, sig2))

    tfr, x, y = narrow_band(sig)
    plt.contour(2 * x, y, np.abs(tfr) ** 2, 16)
    plt.title('Narrow Band ambiguity function')
    plt.xlabel('Delay')
    plt.ylabel('Doppler')
    plt.grid(True)
    plt.show()


.. rst-class:: sphx-glr-timing

   **Total running time of the script:** ( 0 minutes  0.156 seconds)


.. _sphx_glr_download_auto_examples_plot_4_1_3_chirps_ambifunb.py:


.. only :: html

 .. container:: sphx-glr-footer
    :class: sphx-glr-footer-example



  .. container:: sphx-glr-download

     :download:`Download Python source code: plot_4_1_3_chirps_ambifunb.py <plot_4_1_3_chirps_ambifunb.py>`



  .. container:: sphx-glr-download

     :download:`Download Jupyter notebook: plot_4_1_3_chirps_ambifunb.ipynb <plot_4_1_3_chirps_ambifunb.ipynb>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_