Implement Galileo E1B I/NAV navigation decoding

tests/navigation/test_navigation_store.py

@@ -0,0 +1,17 @@
+from __future__ import annotations
+
+from galileo_rx.navigation.navigation_store import NavigationStore
+from tests.navigation.test_ephemeris_assembler import _health, _word
+
+
+def test_navigation_readiness_requires_four_complete_healthy_satellites() -> None:
+    store = NavigationStore()
+    for prn in range(1, 5):
+        store.update_word(_health(prn))
+        for kind in (1, 2, 3, 4):
+            store.update_word(_word(prn, kind, prn, prn * 10 + kind))
+    assert store.navigation_ready(minimum_satellites=4, require_time=True)
+    assert store.navigation_ready(minimum_satellites=4, require_time=False)
+    assert store.get_time_solution() is not None
+    assert store.has_complete_ephemeris(4)
+    assert store.get_clock_parameters(2) is not None