70 lines
2.0 KiB
ReStructuredText
70 lines
2.0 KiB
ReStructuredText
.. _tx:
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Example 2: SDR Transmission
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===========================
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.. contents::
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:local:
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Introduction
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------------
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This example illustrates how to generate a custom chirp signal and transmit it using the ``Blade`` SDR. The waveform is
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created using the ``numpy`` library and encapsulated in a ``Recording`` object.
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Code
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----
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.. code-block:: python
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import time
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import numpy as np
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from ria_toolkit_oss.datatypes.recording import Recording
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from ria_toolkit_oss.sdr.blade import Blade
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# Parameters
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num_samples = 1_000_000 # Total number of samples
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num_chirps = 10 # Number of upchirps
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sample_rate = 1e6 # Sample rate in Hz (arbitrary choice for normalization)
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chirp_duration = num_samples // num_chirps / sample_rate # Duration of each chirp in seconds
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f_start = 0 # Start frequency of the chirp (normalized)
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f_end = 0.5 * sample_rate # End frequency of the chirp (normalized to Nyquist)
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# Generate IQ data as a series of chirps
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t = np.linspace(
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0, chirp_duration, num_samples // num_chirps, endpoint=False
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)
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chirp = np.exp(
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2j
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* np.pi
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* (t * f_start + (f_end - f_start) / (2 * chirp_duration) * t**2)
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)
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iq_data = np.tile(chirp, num_chirps)[:num_samples].astype("complex64")
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# Wrap in Recording object
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iq_data = Recording(data=iq_data)
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# Initialize and configure the radio
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my_radio = Blade()
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my_radio.init_tx(
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sample_rate=sample_rate,
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center_frequency=2.44e9,
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gain=50,
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channel=0,
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)
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# Transmit the recording
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start = time.time()
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my_radio.transmit_recording(recording=iq_data, tx_time=10)
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end = time.time()
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print(f"Transmission complete. Total time: {end - start:.4f} seconds")
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Conclusion
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----------
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This example demonstrates how to use the ``Blade`` class to transmit a custom waveform. By customizing the parameters,
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we can adapt this example to various signal processing and SDR tasks.
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