I'm not sure why exp creates such a bad tone
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167a0b7aef
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48d559f084
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@ -1,7 +1,7 @@
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# %% imports
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import copy
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from pathlib import Path
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from typing import Any, Dict, Optional
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from typing import Any, Dict, Optional, Tuple
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import adi
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import iio
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@ -19,16 +19,22 @@ dir_ = Path(__file__).parent
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# %% connection
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class Charon:
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FREQUENCY_OFFSET = 1e6
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def __init__(
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self,
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uri: str,
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frequency: npt.ArrayLike = np.linspace(1e9, 2e9, 3),
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ports: Tuple[int] = (1,),
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):
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self.ports = ports
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self.frequency = frequency
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# everything RF
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self.sdr = adi.ad9361(uri=uri)
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for attr, expected in [
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("adi,2rx-2tx-mode-enable", True),
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("adi,gpo-manual-mode-enable", True),
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# ("adi,gpo-manual-mode-enable", True),
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]:
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# available configuration options:
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# https://wiki.analog.com/resources/tools-software/linux-drivers/iio-transceiver/ad9361-customization
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@ -40,8 +46,8 @@ class Charon:
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# TODO: it might be possible to change this on the fly.
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# I think we'll actually just fail in __init__ of ad9361 if 2rx-2tx is wrong
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self.sdr.rx_lo = int(frequency[0])
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self.sdr.tx_lo = int(frequency[0])
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self.sdr.rx_lo = int(self.frequency[0])
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self.sdr.tx_lo = int(self.frequency[0])
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self.sdr.sample_rate = 30e6
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self.sdr.rx_rf_bandwidth = int(4e6)
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self.sdr.tx_rf_bandwidth = int(4e6)
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@ -63,7 +69,7 @@ class Charon:
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# https://ez.analog.com/linux-software-drivers/f/q-a/120853/control-fmcomms3-s-gpo-with-python
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# https://www.analog.com/media/cn/technical-documentation/user-guides/ad9364_register_map_reference_manual_ug-672.pdf
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self.ctrl.reg_write(0x26, 0x90) # bit 7: AuxDAC Manual, bit 4: GPO Manual
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self._set_gpo(0)
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self._set_gpo(self.ports[0] - 1)
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# TODO: init AuxDAC
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def get_config(self) -> Dict[str, Any]:
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@ -102,11 +108,9 @@ class Charon:
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# tx_gain = pout.coords["tx_gain"][tx_gain_idx]
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self.sdr.tx_hardwaregain_chan0 = float(tx_gain)
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def set_output(self, frequency: float, power: float, offset_frequency: float = 1e6):
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# TODO: switch to DDS in Pluto
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def generate_tone(f: float, N: int = 1024, fs: Optional[float] = None):
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def generate_tone(self, f: float, N: int = 1024, fs: Optional[float] = None):
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if fs is None:
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fs = sdr.sample_rate
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fs = self.sdr.sample_rate
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fs = int(fs)
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fc = int(f / (fs / N)) * (fs / N)
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ts = 1 / float(fs)
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@ -117,45 +121,142 @@ class Charon:
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return iq
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def set_output(self, frequency: float, power: float):
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# TODO: switch to DDS in Pluto
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self.sdr.tx_destroy_buffer()
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self.set_output_power(power)
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self.sdr.tx_lo = int(frequency - offset_frequency)
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offset_frequency = frequency - self.sdr.tx_lo
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self.sdr.tx_lo = int(frequency - self.FREQUENCY_OFFSET)
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self.sdr.tx_cyclic_buffer = True
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self.sdr.tx(generate_tone(offset_frequency))
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self.sdr.tx(self.generate_tone(self.FREQUENCY_OFFSET))
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def _rx(self) -> npt.ArrayLike:
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def _rx(self, count: int = 1) -> npt.ArrayLike:
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if count < 1:
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raise ValueError
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self.sdr.rx_destroy_buffer()
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return np.array(self.sdr.rx())
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return np.concatenate([np.array(self.sdr.rx()) for _ in range(count)], axis=-1)
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# %%
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sdr = Charon("ip:192.168.3.1")
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# %% initialization
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config = sdr.get_config()
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config
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# %% generate tone
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sdr.set_output(frequency=1e9 + sdr.FREQUENCY_OFFSET, power=-5)
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# %% capture data
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data = sdr._rx(1)
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# %%
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fig, axs = plt.subplots(2, 2, sharex=True, tight_layout=True)
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# ddc_tone = np.exp(
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# -1j * 2 * np.pi * (sdr.FREQUENCY_OFFSET / sdr.sdr.sample_rate) * np.arange(data.shape[-1]), dtype=np.complex128
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# )
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ddc_tone = sdr.generate_tone(-sdr.FREQUENCY_OFFSET) * 2**-14
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ddc_data = data * ddc_tone
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axs[0][0].plot(np.real(ddc_data).T, label="DDC")
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axs[1][0].plot(np.imag(ddc_data).T, label="DDC")
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ddc_rel = ddc_data[1] / ddc_data[0]
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axs[0][1].plot(np.real(ddc_rel).T, label="DDC")
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axs[1][1].plot(np.imag(ddc_rel).T, label="DDC")
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n, wn = signal.buttord(
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wp=0.3 * sdr.FREQUENCY_OFFSET,
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ws=0.8 * sdr.FREQUENCY_OFFSET,
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gpass=1,
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gstop=40,
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analog=False,
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fs=sdr.sdr.sample_rate,
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)
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b, a = signal.butter(n, wn, "lowpass", analog=False, output="ba", fs=sdr.sdr.sample_rate)
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filt_data = signal.lfilter(b, a, ddc_data, axis=-1)
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axs[0][0].plot(np.real(filt_data).T, label="FILT")
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axs[1][0].plot(np.imag(filt_data).T, label="FILT")
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filt_rel = filt_data[1] / filt_data[0]
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axs[0][1].plot(np.real(filt_rel).T, label="FILT")
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axs[1][1].plot(np.imag(filt_rel).T, label="FILT")
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s = np.mean(filt_rel)
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axs[0][1].axhline(np.real(s), color="k")
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axs[1][1].axhline(np.imag(s), color="k")
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axs[0][0].grid(True)
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axs[1][0].grid(True)
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axs[0][1].grid(True)
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axs[1][1].grid(True)
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axs[0][0].legend(loc="lower right")
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axs[1][0].legend(loc="lower right")
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axs[0][1].legend(loc="lower right")
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axs[1][1].legend(loc="lower right")
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axs[0][0].set_ylabel("Real")
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axs[1][0].set_ylabel("Imag")
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axs[0][0].set_title("By Channel")
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axs[0][1].set_title("Relative")
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# %% Plot in time
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data = sdr._rx()
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fig, axs = plt.subplots(2, 1, sharex=True, tight_layout=True)
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axs[0].plot(np.real(data).T)
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axs[1].plot(np.imag(data).T)
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axs[0].set_ylabel("Real")
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axs[1].set_ylabel("Imag")
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axs[-1].set_xlabel("Time")
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axs[0].grid(True)
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axs[1].grid(True)
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axs[-1].set_xlabel("Sample")
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axs[-1].set_xlim(0, data.shape[-1])
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fig.show()
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# %%
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fig, ax = plt.subplots(1, 1, tight_layout=True)
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ax.plot(np.real(data).T, np.imag(data).T)
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ax.grid(True)
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ax.set_aspect("equal")
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ax.set_xlabel("Real")
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ax.set_ylabel("Imag")
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ax.set_xlim(np.array([-1, 1]) * (2 ** (12 - 1) - 1))
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ax.set_ylim(ax.get_xlim())
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fig.show()
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# %% Plot in frequency
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f, Pxx_den = signal.periodogram(data, sdr.sample_rate, axis=-1, return_onesided=False)
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f, Pxx_den = signal.periodogram(data, sdr.sdr.sample_rate, axis=-1, return_onesided=False)
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f_ddc, Pxx_den_ddc = signal.periodogram(ddc_data, sdr.sdr.sample_rate, axis=-1, return_onesided=False)
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f_filt, Pxx_den_filt = signal.periodogram(filt_data, sdr.sdr.sample_rate, axis=-1, return_onesided=False)
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f = np.fft.fftfreq(data.shape[-1], 1 / sdr.sdr.sample_rate)
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Pxx_den = np.fft.fft(data, axis=-1)
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Pxx_den_ddc = np.fft.fft(ddc_data, axis=-1)
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Pxx_den_filt = np.fft.fft(filt_data, axis=-1)
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fft_ddc_tone = np.fft.fft(ddc_tone, axis=-1)
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plt.figure()
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for cc, chan in enumerate(sdr.rx_enabled_channels):
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plt.semilogy(f, Pxx_den[cc], label=f"Channel {chan}")
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for cc, chan in enumerate(sdr.sdr.rx_enabled_channels):
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plt.plot(
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np.fft.fftshift(f),
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db20(np.fft.fftshift(Pxx_den[cc])),
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label=f"Channel {chan}",
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)
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plt.plot(
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np.fft.fftshift(f),
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db20(np.fft.fftshift(Pxx_den_ddc[cc])),
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label=f"Channel {chan}",
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)
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plt.plot(
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np.fft.fftshift(f),
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db20(np.fft.fftshift(Pxx_den_filt[cc])),
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label=f"Channel {chan}",
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)
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plt.plot(
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np.fft.fftshift(f),
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db20(np.fft.fftshift(fft_ddc_tone)),
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label="DDC Tone",
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)
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plt.legend()
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plt.ylim([1e-7, 1e2])
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plt.xlabel("frequency [Hz]")
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plt.ylabel("PSD [V**2/Hz]")
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# plt.ylim(1e-7, 1e2)
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plt.ylim(0)
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plt.xlabel("Frequency [Hz]")
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plt.ylabel("PSD [$V^2/Hz$]")
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plt.title(f"Fc = {sdr.sdr.rx_lo / 1e9} GHz")
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plt.gca().xaxis.set_major_formatter(EngFormatter())
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plt.grid(True)
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plt.show()
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