Implement Galileo E1B I/NAV navigation decoding

tests/integration/test_multisat_navigation_collection.py

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+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import pytest
+
+
+@pytest.mark.signalsim
+def test_four_satellites_are_navigation_ready_without_truth_inputs() -> None:
+    path = Path("reports/navigation_run/inav_collection_report.json")
+    if not path.is_file():
+        pytest.skip("SignalSim multi-satellite navigation collection report is unavailable")
+    report = json.loads(path.read_text(encoding="utf-8"))
+    assert report["decoder_truth_inputs"] == []
+    ready = [
+        item for item in report["satellites"].values()
+        if item["complete_ephemeris"] and item["clock_parameters"] and item["health_valid"] and item["data_valid"]
+    ]
+    assert len(ready) >= 4
+    assert report["galileo_time"]["valid"] is True
+    assert report["navigation_ready"] is True

tests/integration/test_signalsim_inav_ephemeris.py

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+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import pytest
+
+
+@pytest.mark.signalsim
+def test_signalsim_decoded_ephemerides_match_rinex_truth_within_quantization() -> None:
+    path = Path("reports/inav_truth_comparison.json")
+    if not path.is_file():
+        pytest.skip("post-decode SignalSim truth-comparison report is unavailable")
+    report = json.loads(path.read_text(encoding="utf-8"))
+    assert report["truth_injected_into_decoder"] is False
+    assert report["overall_pass"] is True
+    assert len(report["satellites"]) >= 4
+    assert all(item["pass"] for item in report["satellites"].values())
+    assert report["galileo_time"]["pass"] is True
+    assert report["galileo_time"]["time_of_week_absolute_error_s"] <= 1

tests/integration/test_signalsim_inav_pages.py

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+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+
+from galileo_rx.navigation.decoder_diagnostics import load_prompt_epochs
+from galileo_rx.navigation.inav_pipeline import InavNavigationPipeline
+
+
+@pytest.mark.signalsim
+def test_signalsim_prompts_produce_crc_valid_inav_pages() -> None:
+    path = Path("verification/navigation/signalsim_navigation_multisat/prn_01/prompt_epochs.npz")
+    if not path.is_file():
+        pytest.skip("SignalSim navigation prompt artifact is unavailable; run collect-navigation first")
+    decoded = InavNavigationPipeline(1).process(load_prompt_epochs(path, 1))
+    assert len(decoded.pages) == 15
+    assert all(page.sync_valid and page.fec_valid and page.crc_valid for page in decoded.pages)
+    assert {word.word_type for word in decoded.words} == {1, 2, 3, 4, 5, 6}

tests/integration/test_signalsim_inav_symbols.py

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+from __future__ import annotations
+
+from pathlib import Path
+
+import numpy as np
+import pytest
+
+from galileo_rx.navigation.decoder_diagnostics import load_prompt_epochs
+from galileo_rx.navigation.e1b_symbol_sync import E1BSymbolSynchronizer
+
+
+@pytest.mark.signalsim
+def test_signalsim_prompt_artifact_recovers_soft_and_hard_symbols() -> None:
+    path = Path("verification/navigation/signalsim_navigation_multisat/prn_01/prompt_epochs.npz")
+    if not path.is_file():
+        pytest.skip("SignalSim navigation prompt artifact is unavailable; run collect-navigation first")
+    prompts = load_prompt_epochs(path, 1)
+    symbols = E1BSymbolSynchronizer(8, 0.1).process_many(prompts)
+    soft = np.asarray([item.soft_value for item in symbols], dtype=np.float64)
+    assert soft.dtype == np.float64
+    assert len(symbols) == 8044
+    assert np.count_nonzero([item.valid for item in symbols]) > 7500
+    assert {item.hard_value for item in symbols} == {0, 1}