calib fix

rfg_adc_plotter/gui/pyqtgraph_backend.py

@@ -13,14 +13,17 @@ import numpy as np
 from rfg_adc_plotter.constants import FFT_LEN, SWEEP_FREQ_MAX_GHZ, SWEEP_FREQ_MIN_GHZ
 from rfg_adc_plotter.io.sweep_reader import SweepReader
 from rfg_adc_plotter.processing.calibration import (
+    build_calib_envelope,
     calibrate_freqs,
     get_calibration_base,
     get_calibration_coeffs,
+    load_calib_envelope,
+    save_calib_envelope,
     set_calibration_base_value,
 )
 from rfg_adc_plotter.processing.fft import compute_fft_row, fft_mag_to_db
 from rfg_adc_plotter.processing.formatting import compute_auto_ylim, format_status_kv, parse_spec_clip
-from rfg_adc_plotter.processing.normalization import normalize_by_calib
+from rfg_adc_plotter.processing.normalization import normalize_by_envelope, resample_envelope
 from rfg_adc_plotter.processing.peaks import (
     find_peak_width_markers,
     find_top_peaks_over_ref,
@@ -95,7 +98,6 @@ def run_pyqtgraph(args) -> None:
     fft_bins = FFT_LEN // 2 + 1
     spec_clip = parse_spec_clip(getattr(args, "spec_clip", None))
     spec_mean_sec = float(getattr(args, "spec_mean_sec", 0.0))
-    norm_type = str(getattr(args, "norm_type", "projector")).strip().lower()
     runtime = RuntimeState(ring=RingBuffer(max_sweeps))
 
     pg.setConfigOptions(
@@ -130,8 +132,8 @@ def run_pyqtgraph(args) -> None:
     settings_layout.setContentsMargins(6, 6, 6, 6)
     settings_layout.setSpacing(8)
     try:
-        settings_widget.setMinimumWidth(130)
+        settings_widget.setMinimumWidth(250)
-        settings_widget.setMaximumWidth(150)
+        settings_widget.setMaximumWidth(340)
     except Exception:
         pass
     main_layout.addWidget(settings_widget)
@@ -201,16 +203,41 @@ def run_pyqtgraph(args) -> None:
     spec_left_line.setVisible(False)
     spec_right_line.setVisible(False)
 
-    calib_cb = QtWidgets.QCheckBox("нормировка")
+    calib_cb = QtWidgets.QCheckBox("калибровка по огибающей")
     bg_compute_cb = QtWidgets.QCheckBox("расчет фона")
     bg_subtract_cb = QtWidgets.QCheckBox("вычет фона")
     fft_bg_subtract_cb = QtWidgets.QCheckBox("FFT вычет фона")
     peak_search_cb = QtWidgets.QCheckBox("поиск пиков")
+    calib_group = QtWidgets.QGroupBox("Калибровка")
+    calib_group_layout = QtWidgets.QVBoxLayout(calib_group)
+    calib_group_layout.setContentsMargins(6, 6, 6, 6)
+    calib_group_layout.setSpacing(6)
+    calib_group_layout.addWidget(calib_cb)
+    calib_path_edit = QtWidgets.QLineEdit("calibration_envelope.npy")
+    try:
+        calib_path_edit.setPlaceholderText("calibration_envelope.npy")
+    except Exception:
+        pass
+    calib_path_row = QtWidgets.QHBoxLayout()
+    calib_path_row.setContentsMargins(0, 0, 0, 0)
+    calib_path_row.setSpacing(4)
+    calib_path_row.addWidget(calib_path_edit)
+    calib_pick_btn = QtWidgets.QPushButton("Файл...")
+    calib_path_row.addWidget(calib_pick_btn)
+    calib_group_layout.addLayout(calib_path_row)
+    calib_buttons_row = QtWidgets.QHBoxLayout()
+    calib_buttons_row.setContentsMargins(0, 0, 0, 0)
+    calib_buttons_row.setSpacing(4)
+    calib_save_btn = QtWidgets.QPushButton("Сохранить текущую")
+    calib_load_btn = QtWidgets.QPushButton("Загрузить")
+    calib_buttons_row.addWidget(calib_save_btn)
+    calib_buttons_row.addWidget(calib_load_btn)
+    calib_group_layout.addLayout(calib_buttons_row)
     try:
         settings_layout.addWidget(QtWidgets.QLabel("Настройки"))
     except Exception:
         pass
-    settings_layout.addWidget(calib_cb)
+    settings_layout.addWidget(calib_group)
     settings_layout.addWidget(bg_compute_cb)
     settings_layout.addWidget(bg_subtract_cb)
     settings_layout.addWidget(fft_bg_subtract_cb)
@@ -223,6 +250,8 @@ def run_pyqtgraph(args) -> None:
     bg_compute_enabled = True
     bg_subtract_enabled = False
     fft_bg_subtract_enabled = False
+    status_note = ""
+    status_dirty = True
     fixed_ylim: Optional[Tuple[float, float]] = None
     if args.ylim:
         try:
@@ -270,8 +299,49 @@ def run_pyqtgraph(args) -> None:
             img_fft.setRect(0, d_min, max_sweeps, d_max - d_min)
             p_spec.setRange(xRange=(0, max_sweeps - 1), yRange=(d_min, d_max), padding=0)
 
-    def normalize_sweep(raw: np.ndarray, calib: np.ndarray) -> np.ndarray:
+    def resolve_curve_xs(size: int) -> np.ndarray:
-        return normalize_by_calib(raw, calib, norm_type=norm_type)
+        if size <= 0:
+            return np.zeros((0,), dtype=np.float32)
+        if runtime.current_freqs is not None and runtime.current_freqs.size == size:
+            return runtime.current_freqs
+        if runtime.current_freqs is not None and runtime.current_freqs.size > 1:
+            return np.linspace(
+                float(runtime.current_freqs[0]),
+                float(runtime.current_freqs[-1]),
+                size,
+                dtype=np.float64,
+            )
+        if runtime.ring.x_shared is not None and size <= runtime.ring.x_shared.size:
+            return runtime.ring.x_shared[:size]
+        return np.arange(size, dtype=np.float32)
+
+    def set_status_note(note: str) -> None:
+        nonlocal status_note, status_dirty
+        status_note = str(note).strip()
+        status_dirty = True
+
+    def get_calib_file_path() -> str:
+        try:
+            path = calib_path_edit.text().strip()
+        except Exception:
+            path = ""
+        return path or "calibration_envelope.npy"
+
+    def recompute_current_processed_sweep(push_to_ring: bool = False) -> None:
+        if runtime.current_sweep_raw is not None and calib_enabled and runtime.calib_envelope is not None:
+            runtime.current_sweep_norm = normalize_by_envelope(runtime.current_sweep_raw, runtime.calib_envelope)
+        else:
+            runtime.current_sweep_norm = None
+
+        runtime.current_fft_db = None
+        if not push_to_ring or runtime.current_sweep_raw is None:
+            return
+
+        sweep_for_processing = runtime.current_sweep_norm if runtime.current_sweep_norm is not None else runtime.current_sweep_raw
+        ensure_buffer(runtime.current_sweep_raw.size)
+        runtime.ring.push(sweep_for_processing, runtime.current_freqs)
+        runtime.current_distances = runtime.ring.distance_axis
+        runtime.current_fft_db = runtime.ring.last_fft_db
 
     def set_calib_enabled() -> None:
         nonlocal calib_enabled
@@ -279,10 +349,74 @@ def run_pyqtgraph(args) -> None:
             calib_enabled = bool(calib_cb.isChecked())
         except Exception:
             calib_enabled = False
-        if calib_enabled and runtime.current_sweep_raw is not None and runtime.last_calib_sweep is not None:
+        if calib_enabled and runtime.calib_envelope is None:
-            runtime.current_sweep_norm = normalize_sweep(runtime.current_sweep_raw, runtime.last_calib_sweep)
+            set_status_note("калибровка: огибающая не загружена")
-        else:
+        recompute_current_processed_sweep(push_to_ring=False)
-            runtime.current_sweep_norm = None
+        runtime.mark_dirty()
+
+    def pick_calib_file() -> None:
+        start_path = get_calib_file_path()
+        try:
+            selected, _ = QtWidgets.QFileDialog.getSaveFileName(
+                main_window,
+                "Файл калибровки",
+                start_path,
+                "NumPy (*.npy);;All files (*)",
+            )
+        except Exception as exc:
+            set_status_note(f"калибровка: выбор файла недоступен ({exc})")
+            runtime.mark_dirty()
+            return
+        if not selected:
+            return
+        try:
+            calib_path_edit.setText(selected)
+        except Exception:
+            pass
+
+    def save_current_calibration() -> None:
+        if runtime.current_sweep_raw is None or runtime.current_sweep_raw.size == 0:
+            set_status_note("калибровка: нет текущего raw-свипа")
+            runtime.mark_dirty()
+            return
+        try:
+            envelope = build_calib_envelope(runtime.current_sweep_raw)
+            saved_path = save_calib_envelope(get_calib_file_path(), envelope)
+        except Exception as exc:
+            set_status_note(f"калибровка: не удалось сохранить ({exc})")
+            runtime.mark_dirty()
+            return
+
+        runtime.calib_envelope = envelope
+        runtime.calib_file_path = saved_path
+        runtime.last_calib_sweep = None
+        try:
+            calib_path_edit.setText(saved_path)
+        except Exception:
+            pass
+        recompute_current_processed_sweep(push_to_ring=False)
+        set_status_note(f"калибровка сохранена: {saved_path}")
+        runtime.mark_dirty()
+
+    def load_calibration_file() -> None:
+        path = get_calib_file_path()
+        try:
+            envelope = load_calib_envelope(path)
+        except Exception as exc:
+            set_status_note(f"калибровка: не удалось загрузить ({exc})")
+            runtime.mark_dirty()
+            return
+
+        normalized_path = path if path.lower().endswith(".npy") else f"{path}.npy"
+        runtime.calib_envelope = envelope
+        runtime.calib_file_path = normalized_path
+        runtime.last_calib_sweep = None
+        try:
+            calib_path_edit.setText(normalized_path)
+        except Exception:
+            pass
+        recompute_current_processed_sweep(push_to_ring=False)
+        set_status_note(f"калибровка загружена: {normalized_path}")
         runtime.mark_dirty()
 
     def set_bg_compute_enabled() -> None:
@@ -317,6 +451,9 @@ def run_pyqtgraph(args) -> None:
 
     try:
         calib_cb.stateChanged.connect(lambda _v: set_calib_enabled())
+        calib_pick_btn.clicked.connect(lambda _checked=False: pick_calib_file())
+        calib_save_btn.clicked.connect(lambda _checked=False: save_current_calibration())
+        calib_load_btn.clicked.connect(lambda _checked=False: load_calibration_file())
         bg_compute_cb.stateChanged.connect(lambda _v: set_bg_compute_enabled())
         bg_subtract_cb.stateChanged.connect(lambda _v: set_bg_subtract_enabled())
         fft_bg_subtract_cb.stateChanged.connect(lambda _v: set_fft_bg_subtract_enabled())
@@ -531,29 +668,7 @@ def run_pyqtgraph(args) -> None:
             runtime.current_sweep_raw = calibrated["I"]
             runtime.current_aux_curves = aux_curves
             runtime.current_info = info
-
+            recompute_current_processed_sweep(push_to_ring=True)
-            channel = 0
-            try:
-                channel = int(info.get("ch", 0)) if isinstance(info, dict) else 0
-            except Exception:
-                channel = 0
-
-            if channel == 0:
-                runtime.last_calib_sweep = runtime.current_sweep_raw
-                runtime.current_sweep_norm = None
-                sweep_for_processing = runtime.current_sweep_raw
-            else:
-                if calib_enabled and runtime.last_calib_sweep is not None:
-                    runtime.current_sweep_norm = normalize_sweep(runtime.current_sweep_raw, runtime.last_calib_sweep)
-                    sweep_for_processing = runtime.current_sweep_norm
-                else:
-                    runtime.current_sweep_norm = None
-                    sweep_for_processing = runtime.current_sweep_raw
-
-            ensure_buffer(runtime.current_sweep_raw.size)
-            runtime.ring.push(sweep_for_processing, runtime.current_freqs)
-            runtime.current_distances = runtime.ring.distance_axis
-            runtime.current_fft_db = runtime.ring.last_fft_db
         if drained > 0:
             update_physical_axes()
         return drained
@@ -569,7 +684,7 @@ def run_pyqtgraph(args) -> None:
         pass
 
     def update() -> None:
-        nonlocal peak_ref_window
+        nonlocal peak_ref_window, status_dirty
         if peak_calibrate_mode and any(edit.hasFocus() for edit in c_edits):
             return
         if peak_search_enabled and peak_window_edit is not None and peak_window_edit.hasFocus():
@@ -584,26 +699,34 @@ def run_pyqtgraph(args) -> None:
             except Exception:
                 bg_fft_for_line = None
 
-        if redraw_needed and runtime.current_sweep_raw is not None:
+        if redraw_needed and (runtime.current_sweep_raw is not None or runtime.calib_envelope is not None):
-            xs = None
+            xs = resolve_curve_xs(
-            if runtime.current_freqs is not None and runtime.current_freqs.size == runtime.current_sweep_raw.size:
+                runtime.current_sweep_raw.size if runtime.current_sweep_raw is not None else runtime.calib_envelope.size
-                xs = runtime.current_freqs
+            )
-            elif runtime.ring.x_shared is not None and runtime.current_sweep_raw.size <= runtime.ring.x_shared.size:
+            displayed_calib = None
-                xs = runtime.ring.x_shared[: runtime.current_sweep_raw.size]
-            else:
-                xs = np.arange(runtime.current_sweep_raw.size)
 
-            curve.setData(xs, runtime.current_sweep_raw, autoDownsample=True)
+            if runtime.current_sweep_raw is not None:
-            if runtime.current_aux_curves is not None:
+                curve.setData(xs[: runtime.current_sweep_raw.size], runtime.current_sweep_raw, autoDownsample=True)
-                avg_1_curve, avg_2_curve = runtime.current_aux_curves
+                if runtime.current_aux_curves is not None:
-                curve_avg1.setData(xs[: avg_1_curve.size], avg_1_curve, autoDownsample=True)
+                    avg_1_curve, avg_2_curve = runtime.current_aux_curves
-                curve_avg2.setData(xs[: avg_2_curve.size], avg_2_curve, autoDownsample=True)
+                    curve_avg1.setData(xs[: avg_1_curve.size], avg_1_curve, autoDownsample=True)
+                    curve_avg2.setData(xs[: avg_2_curve.size], avg_2_curve, autoDownsample=True)
+                else:
+                    curve_avg1.setData([], [])
+                    curve_avg2.setData([], [])
             else:
+                curve.setData([], [])
                 curve_avg1.setData([], [])
                 curve_avg2.setData([], [])
 
-            if runtime.last_calib_sweep is not None:
+            if runtime.calib_envelope is not None:
-                curve_calib.setData(xs[: runtime.last_calib_sweep.size], runtime.last_calib_sweep, autoDownsample=True)
+                if runtime.current_sweep_raw is not None:
+                    displayed_calib = resample_envelope(runtime.calib_envelope, runtime.current_sweep_raw.size)
+                    xs_calib = xs[: displayed_calib.size]
+                else:
+                    displayed_calib = runtime.calib_envelope
+                    xs_calib = resolve_curve_xs(displayed_calib.size)
+                curve_calib.setData(xs_calib, displayed_calib, autoDownsample=True)
             else:
                 curve_calib.setData([], [])
 
@@ -613,8 +736,8 @@ def run_pyqtgraph(args) -> None:
                 curve_norm.setData([], [])
 
             if fixed_ylim is None:
-                y_series = [runtime.current_sweep_raw, runtime.last_calib_sweep, runtime.current_sweep_norm]
+                y_series = [runtime.current_sweep_raw, displayed_calib, runtime.current_sweep_norm]
-                if runtime.current_aux_curves is not None:
+                if runtime.current_aux_curves is not None and runtime.current_sweep_raw is not None:
                     y_series.extend(runtime.current_aux_curves)
                 y_limits = compute_auto_ylim(*y_series)
                 if y_limits is not None:
@@ -627,7 +750,7 @@ def run_pyqtgraph(args) -> None:
 
             sweep_for_fft = runtime.current_sweep_norm if runtime.current_sweep_norm is not None else runtime.current_sweep_raw
             distance_axis = runtime.current_distances if runtime.current_distances is not None else runtime.ring.distance_axis
-            if sweep_for_fft.size > 0 and distance_axis is not None:
+            if sweep_for_fft is not None and sweep_for_fft.size > 0 and distance_axis is not None:
                 if runtime.current_fft_db is None or runtime.current_fft_db.size != distance_axis.size or runtime.plot_dirty:
                     runtime.current_fft_db = compute_fft_row(sweep_for_fft, runtime.current_freqs, distance_axis.size)
                 fft_vals = runtime.current_fft_db
@@ -735,16 +858,23 @@ def run_pyqtgraph(args) -> None:
             else:
                 img.setImage(disp, autoLevels=False)
 
-        if changed and runtime.current_info:
+        if redraw_needed or status_dirty:
             try:
-                status_payload = dict(runtime.current_info)
+                status_payload = dict(runtime.current_info) if runtime.current_info else {}
                 if peak_calibrate_mode and runtime.current_peak_width is not None:
                     status_payload["peak_w"] = runtime.current_peak_width
                 if peak_calibrate_mode and runtime.current_peak_amplitude is not None:
                     status_payload["peak_a"] = runtime.current_peak_amplitude
-                status.setText(format_status_kv(status_payload))
+                base_status = format_status_kv(status_payload) if status_payload else ""
+                if status_note:
+                    status.setText(f"{base_status} | {status_note}" if base_status else status_note)
+                else:
+                    status.setText(base_status)
             except Exception:
                 pass
+            status_dirty = False
+
+        if changed and runtime.current_info:
             try:
                 chs = runtime.current_info.get("chs") if isinstance(runtime.current_info, dict) else None
                 if chs is None:

rfg_adc_plotter/processing/__init__.py

@@ -1,10 +1,13 @@
 """Pure sweep-processing helpers."""
 
 from rfg_adc_plotter.processing.calibration import (
+    build_calib_envelope,
     calibrate_freqs,
     get_calibration_base,
     get_calibration_coeffs,
+    load_calib_envelope,
     recalculate_calibration_c,
+    save_calib_envelope,
     set_calibration_base_value,
 )
 from rfg_adc_plotter.processing.fft import (
@@ -20,6 +23,7 @@ from rfg_adc_plotter.processing.formatting import (
 )
 from rfg_adc_plotter.processing.normalization import (
     build_calib_envelopes,
+    normalize_by_envelope,
     normalize_by_calib,
 )
 from rfg_adc_plotter.processing.peaks import (
@@ -30,6 +34,7 @@ from rfg_adc_plotter.processing.peaks import (
 
 __all__ = [
     "build_calib_envelopes",
+    "build_calib_envelope",
     "calibrate_freqs",
     "compute_auto_ylim",
     "compute_distance_axis",
@@ -41,9 +46,12 @@ __all__ = [
     "format_status_kv",
     "get_calibration_base",
     "get_calibration_coeffs",
+    "load_calib_envelope",
+    "normalize_by_envelope",
     "normalize_by_calib",
     "parse_spec_clip",
     "recalculate_calibration_c",
     "rolling_median_ref",
+    "save_calib_envelope",
     "set_calibration_base_value",
 ]

rfg_adc_plotter/processing/calibration.py

@@ -2,11 +2,13 @@
 
 from __future__ import annotations
 
+from pathlib import Path
 from typing import Any, Mapping
 
 import numpy as np
 
 from rfg_adc_plotter.constants import SWEEP_FREQ_MAX_GHZ, SWEEP_FREQ_MIN_GHZ
+from rfg_adc_plotter.processing.normalization import build_calib_envelopes
 from rfg_adc_plotter.types import SweepData
 
 
@@ -79,3 +81,44 @@ def calibrate_freqs(sweep: Mapping[str, Any]) -> SweepData:
         "F": freqs_cal,
         "I": values_cal,
     }
+
+
+def build_calib_envelope(sweep: np.ndarray) -> np.ndarray:
+    """Build the active calibration envelope from a raw sweep."""
+    values = np.asarray(sweep, dtype=np.float32).reshape(-1)
+    if values.size == 0:
+        raise ValueError("Calibration sweep is empty")
+    _, upper = build_calib_envelopes(values)
+    return np.asarray(upper, dtype=np.float32)
+
+
+def validate_calib_envelope(envelope: np.ndarray) -> np.ndarray:
+    """Validate a saved calibration envelope payload."""
+    values = np.asarray(envelope, dtype=np.float32).reshape(-1)
+    if values.size == 0:
+        raise ValueError("Calibration envelope is empty")
+    if not np.issubdtype(values.dtype, np.number):
+        raise ValueError("Calibration envelope must be numeric")
+    return values
+
+
+def _normalize_calib_path(path: str | Path) -> Path:
+    out = Path(path).expanduser()
+    if out.suffix.lower() != ".npy":
+        out = out.with_suffix(".npy")
+    return out
+
+
+def save_calib_envelope(path: str | Path, envelope: np.ndarray) -> str:
+    """Persist a calibration envelope as a .npy file and return the final path."""
+    normalized_path = _normalize_calib_path(path)
+    values = validate_calib_envelope(envelope)
+    np.save(normalized_path, values.astype(np.float32, copy=False))
+    return str(normalized_path)
+
+
+def load_calib_envelope(path: str | Path) -> np.ndarray:
+    """Load and validate a calibration envelope from a .npy file."""
+    normalized_path = _normalize_calib_path(path)
+    loaded = np.load(normalized_path, allow_pickle=False)
+    return validate_calib_envelope(loaded)

rfg_adc_plotter/processing/normalization.py

@@ -108,6 +108,52 @@ def normalize_sweep_projector(raw: np.ndarray, calib: np.ndarray) -> np.ndarray:
     return out
 
 
+def resample_envelope(envelope: np.ndarray, width: int) -> np.ndarray:
+    """Resample an envelope to the target sweep width on the index axis."""
+    target_width = int(width)
+    if target_width <= 0:
+        return np.zeros((0,), dtype=np.float32)
+
+    values = np.asarray(envelope, dtype=np.float32).reshape(-1)
+    if values.size == 0:
+        return np.full((target_width,), np.nan, dtype=np.float32)
+    if values.size == target_width:
+        return values.astype(np.float32, copy=True)
+
+    x_src = np.arange(values.size, dtype=np.float32)
+    finite = np.isfinite(values)
+    if not np.any(finite):
+        return np.full((target_width,), np.nan, dtype=np.float32)
+    if int(np.count_nonzero(finite)) == 1:
+        fill = float(values[finite][0])
+        return np.full((target_width,), fill, dtype=np.float32)
+
+    x_dst = np.linspace(0.0, float(values.size - 1), target_width, dtype=np.float32)
+    return np.interp(x_dst, x_src[finite], values[finite]).astype(np.float32)
+
+
+def normalize_by_envelope(raw: np.ndarray, envelope: np.ndarray) -> np.ndarray:
+    """Normalize a sweep by an envelope with safe resampling and zero protection."""
+    raw_arr = np.asarray(raw, dtype=np.float32).reshape(-1)
+    if raw_arr.size == 0:
+        return raw_arr.copy()
+
+    env = resample_envelope(envelope, raw_arr.size)
+    out = np.full_like(raw_arr, np.nan, dtype=np.float32)
+
+    finite_env = np.abs(env[np.isfinite(env)])
+    if finite_env.size > 0:
+        eps = max(float(np.median(finite_env)) * 1e-6, 1e-9)
+    else:
+        eps = 1e-9
+
+    valid = np.isfinite(raw_arr) & np.isfinite(env) & (np.abs(env) > eps)
+    if np.any(valid):
+        with np.errstate(divide="ignore", invalid="ignore"):
+            out[valid] = raw_arr[valid] / env[valid]
+    return np.nan_to_num(out, nan=np.nan, posinf=np.nan, neginf=np.nan)
+
+
 def normalize_by_calib(raw: np.ndarray, calib: np.ndarray, norm_type: str) -> np.ndarray:
     """Apply the selected normalization method."""
     norm = str(norm_type).strip().lower()

rfg_adc_plotter/state/runtime_state.py

@@ -21,6 +21,8 @@ class RuntimeState:
     current_sweep_norm: Optional[np.ndarray] = None
     current_fft_db: Optional[np.ndarray] = None
     last_calib_sweep: Optional[np.ndarray] = None
+    calib_envelope: Optional[np.ndarray] = None
+    calib_file_path: Optional[str] = None
     current_info: Optional[SweepInfo] = None
     bg_spec_cache: Optional[np.ndarray] = None
     current_peak_width: Optional[float] = None

tests/test_processing.py

@@ -1,11 +1,24 @@
 from __future__ import annotations
 
+import os
+import tempfile
 import numpy as np
 import unittest
 
-from rfg_adc_plotter.processing.calibration import calibrate_freqs, recalculate_calibration_c
+from rfg_adc_plotter.processing.calibration import (
+    build_calib_envelope,
+    calibrate_freqs,
+    load_calib_envelope,
+    recalculate_calibration_c,
+    save_calib_envelope,
+)
 from rfg_adc_plotter.processing.fft import compute_distance_axis, compute_fft_mag_row, compute_fft_row
-from rfg_adc_plotter.processing.normalization import build_calib_envelopes, normalize_by_calib
+from rfg_adc_plotter.processing.normalization import (
+    build_calib_envelopes,
+    normalize_by_calib,
+    normalize_by_envelope,
+    resample_envelope,
+)
 from rfg_adc_plotter.processing.peaks import find_peak_width_markers, find_top_peaks_over_ref, rolling_median_ref
 
 
@@ -39,6 +52,32 @@ class ProcessingTests(unittest.TestCase):
         self.assertTrue(np.any(np.isfinite(simple)))
         self.assertTrue(np.any(np.isfinite(projector)))
 
+    def test_file_calibration_envelope_roundtrip_and_division(self):
+        raw = (np.sin(np.linspace(0.0, 8.0 * np.pi, 128)) * 50.0 + 100.0).astype(np.float32)
+        envelope = build_calib_envelope(raw)
+        normalized = normalize_by_envelope(raw, envelope)
+        resampled = resample_envelope(envelope, 96)
+
+        self.assertEqual(envelope.shape, raw.shape)
+        self.assertEqual(normalized.shape, raw.shape)
+        self.assertEqual(resampled.shape, (96,))
+        self.assertTrue(np.any(np.isfinite(normalized)))
+        self.assertTrue(np.all(np.isfinite(envelope)))
+
+        with tempfile.TemporaryDirectory() as tmp_dir:
+            path = os.path.join(tmp_dir, "calibration_envelope")
+            saved_path = save_calib_envelope(path, envelope)
+            loaded = load_calib_envelope(saved_path)
+            self.assertTrue(saved_path.endswith(".npy"))
+            self.assertTrue(np.allclose(loaded, envelope))
+
+    def test_load_calib_envelope_rejects_empty_payload(self):
+        with tempfile.TemporaryDirectory() as tmp_dir:
+            path = os.path.join(tmp_dir, "empty.npy")
+            np.save(path, np.zeros((0,), dtype=np.float32))
+            with self.assertRaises(ValueError):
+                load_calib_envelope(path)
+
     def test_fft_helpers_return_expected_shapes(self):
         sweep = np.sin(np.linspace(0.0, 4.0 * np.pi, 128)).astype(np.float32)
         freqs = np.linspace(3.3, 14.3, 128, dtype=np.float64)