I-ALiRT - Test decom for HIT CCSDS

imap_processing/ialirt/l0/process_hit.py

@@ -0,0 +1,220 @@
+"""Functions to support HIT processing."""
+
+import logging
+
+import numpy as np
+import xarray as xr
+
+logger = logging.getLogger(__name__)
+
+
+# HIT prefixes as defined by Table 37 of the HIT Algorithm Document.
+HIT_PREFIX_TO_RATE_TYPE = {
+    "FAST_RATE_1": [
+        f"{prefix}_{i:02d}"
+        for i in range(15)
+        for prefix in ["L1A_TRIG", "IA_EVNT_TRIG", "A_EVNT_TRIG", "L3A_TRIG"]
+    ],
+    "FAST_RATE_2": [
+        f"{prefix}_{i:02d}"
+        for i in range(15)
+        for prefix in ["L1B_TRIG", "IB_EVNT_TRIG", "B_EVNT_TRIG", "L3B_TRIG"]
+    ],
+    "SLOW_RATE": [
+        "L1A",
+        "L2A",
+        "L3A",
+        "L1A0AHG",
+        "L1B0AHG",
+        "L1C0AHG",
+        "L4IAHG",
+        "L4OAHG",
+        "SLOW_RATE_08",
+        "SLOW_RATE_09",
+        "SLOW_RATE_10",
+        "L1A0BHG",
+        "L1B0BHG",
+        "L1C0BHG",
+        "L4IBHG",
+        "L4OBHG",
+        *[f"IALRT_RATE_{i}" for i in range(1, 21)],
+        "TRIG_IA_EVNT",
+        "TRIG_IB_EVNT",
+        "NASIDE_IALRT",
+        "NBSIDE_IALRT",
+        *[f"ERATE_{i}" for i in range(1, 6)],
+        "L12A",
+        "L123A",
+        "PENA",
+        "L12B",
+        "L123B",
+        "PENB",
+        "SLOW_RATE_51",
+        "SLOW_RATE_52",
+        "SLOW_RATE_53",
+        "SLOW_RATE_54",
+        "H_06_08",
+        "H_12_15",
+        "H_15_70",
+        "HE4_06_08",
+        "HE4_15_70",
+    ],
+}
+
+
+def find_groups(data: xr.Dataset) -> xr.Dataset:
+    """
+    Find all occurrences of the sequential set of 60 values 0-59.
+
+    If a value is missing, or we are starting/ending
+    in the middle of a sequence we do not count that as a valid group.
+
+    Parameters
+    ----------
+    data : xr.Dataset
+        HIT Dataset.
+
+    Returns
+    -------
+    grouped_data : xr.Dataset
+        Grouped data.
+    """
+    subcom_range = (0, 59)
+
+    data = data.sortby("hit_sc_tick", ascending=True)
+
+    # Use hit_subcom == 0 to define the beginning of the group.
+    # Find hit_sc_tick at this index and use it as the beginning time for the group.
+    start_sc_ticks = data["hit_sc_tick"][(data["hit_subcom"] == subcom_range[0])]
+    start_sc_tick = start_sc_ticks.min()
+    # Use hit_subcom == 59 to define the end of the group.
+    last_sc_ticks = data["hit_sc_tick"][([data["hit_subcom"] == subcom_range[-1]][-1])]
+    last_sc_tick = last_sc_ticks.max()
+
+    # Filter out data before the first subcom=0 and after the last subcom=59.
+    grouped_data = data.where(
+        (data["hit_sc_tick"] >= start_sc_tick) & (data["hit_sc_tick"] <= last_sc_tick),
+        drop=True,
+    )
+
+    # Assign labels based on the hit_sc_tick start times.
+    group_labels = np.searchsorted(
+        start_sc_ticks, grouped_data["hit_sc_tick"], side="right"
+    )
+    # Example:
+    # grouped_data.coords
+    # Coordinates:
+    #   * epoch    (epoch) int64 7kB 315922822184000000 ... 315923721184000000
+    #   * group    (group) int64 7kB 1 1 1 1 1 1 1 1 1 ... 15 15 15 15 15 15 15 15 15
+    grouped_data["group"] = ("group", group_labels)
+
+    return grouped_data
+
+
+def create_l1(
+    fast_rate_1: xr.DataArray,
+    fast_rate_2: xr.DataArray,
+    slow_rate: xr.DataArray,
+) -> dict[str, float]:
+    """
+    Create L1 data dictionary.
+
+    Parameters
+    ----------
+    fast_rate_1 : xr.DataArray
+        Fast rate 1 DataArray.
+    fast_rate_2 : xr.DataArray
+        Fast rate 2 DataArray.
+    slow_rate : xr.DataArray
+        Slow rate DataArray.
+
+    Returns
+    -------
+    l1 : dict
+        Dictionary containing parsed L0 packet data.
+    """
+    fast_rate_1_dict = {
+        prefix: value
+        for prefix, value in zip(
+            HIT_PREFIX_TO_RATE_TYPE["FAST_RATE_1"], fast_rate_1.data
+        )
+    }
+    fast_rate_2_dict = {
+        prefix: value
+        for prefix, value in zip(
+            HIT_PREFIX_TO_RATE_TYPE["FAST_RATE_2"], fast_rate_2.data
+        )
+    }
+    slow_rate_dict = {
+        prefix: value
+        for prefix, value in zip(HIT_PREFIX_TO_RATE_TYPE["SLOW_RATE"], slow_rate.data)
+    }
+
+    l1 = {**fast_rate_1_dict, **fast_rate_2_dict, **slow_rate_dict}
+
+    return l1
+
+
+def process_hit(xarray_data: xr.Dataset) -> list[dict]:
+    """
+    Create L1 data dictionary.
+
+    Parameters
+    ----------
+    xarray_data : dict(xr.Dataset)
+        Dictionary of xarray data including a single
+        set for processing.
+
+    Returns
+    -------
+    hit_data : dict
+        Dictionary final data product.
+    """
+    hit_data = []
+    grouped_data = find_groups(xarray_data)
+    unique_groups = np.unique(grouped_data["group"])
+
+    for group in unique_groups:
+        # Subcom values for the group should be 0-59 with no duplicates.
+        subcom_values = grouped_data["hit_subcom"][
+            (grouped_data["group"] == group).values
+        ]
+
+        # Ensure no duplicates and all values from 0 to 59 are present
+        if not np.array_equal(subcom_values, np.arange(60)):
+            raise ValueError(
+                f"Group {group} does not contain all values from 0 to "
+                f"59 without duplicates."
+            )
+
+        fast_rate_1 = grouped_data["hit_fast_rate_1"][
+            (grouped_data["group"] == group).values
+        ]
+        fast_rate_2 = grouped_data["hit_fast_rate_2"][
+            (grouped_data["group"] == group).values
+        ]
+        slow_rate = grouped_data["hit_slow_rate"][
+            (grouped_data["group"] == group).values
+        ]
+        met = int(grouped_data["hit_met"][(grouped_data["group"] == group).values][0])
+
+        l1 = create_l1(fast_rate_1, fast_rate_2, slow_rate)
+
+        hit_data.append(
+            {
+                "met": met,
+                "hit_lo_energy_e_A_side": l1["IALRT_RATE_1"] + l1["IALRT_RATE_2"],
+                "hit_medium_energy_e_A_side": l1["IALRT_RATE_5"] + l1["IALRT_RATE_6"],
+                "hit_high_energy_e_A_side": l1["IALRT_RATE_7"],
+                "hit_low_energy_e_B_side": l1["IALRT_RATE_11"] + l1["IALRT_RATE_12"],
+                "hit_medium_energy_e_B_side": l1["IALRT_RATE_15"] + l1["IALRT_RATE_16"],
+                "hit_high_energy_e_B_side": l1["IALRT_RATE_17"],
+                "hit_medium_energy_H_omni": l1["H_12_15"] + l1["H_15_70"],
+                "hit_high_energy_H_A_side": l1["IALRT_RATE_8"],
+                "hit_high_energy_H_B_side": l1["IALRT_RATE_18"],
+                "hit_low_energy_He_omni": l1["HE4_06_08"],
+                "hit_high_energy_He_omni": l1["HE4_15_70"],
+            }
+        )
+
+    return hit_data

imap_processing/ialirt/packet_definitions/ialirt.xml

@@ -557,16 +557,16 @@
 			</xtce:Parameter>
 			<!-- CoDICE LO -->
 			<!-- HIT -->
-			<xtce:Parameter name="HIT_SC_TICK" parameterTypeRef="uint32">
-				<xtce:LongDescription>Spacecraft tick</xtce:LongDescription>
+			<xtce:Parameter name="HIT_MET" parameterTypeRef="uint32">
+				<xtce:LongDescription>Mission elapsed time</xtce:LongDescription>
 			</xtce:Parameter>
 			<xtce:Parameter name="HIT_STATUS" parameterTypeRef="instrument_status">
 				<xtce:LongDescription>1 = nominal, 0 = off-nominal</xtce:LongDescription>
 			</xtce:Parameter>
-			<xtce:Parameter name="HIT_RESERVED" parameterTypeRef="uint1">
-				<xtce:LongDescription>Reserved</xtce:LongDescription>
+			<xtce:Parameter name="HIT_SPARE" parameterTypeRef="uint1">
+				<xtce:LongDescription>Spare</xtce:LongDescription>
 			</xtce:Parameter>
-			<xtce:Parameter name="HIT_COUNTER" parameterTypeRef="uint6">
+			<xtce:Parameter name="HIT_SUBCOM" parameterTypeRef="uint6">
 				<xtce:LongDescription>Seconds counter</xtce:LongDescription>
 			</xtce:Parameter>
 			<xtce:Parameter name="HIT_FAST_RATE_1" parameterTypeRef="uint16">
@@ -717,10 +717,10 @@
 					<xtce:ParameterRefEntry parameterRef="COD_LO_SPARE_0"/>
 					<!-- CoDICE LO -->
 					<!-- HIT -->
-					<xtce:ParameterRefEntry parameterRef="HIT_SC_TICK"/>
+					<xtce:ParameterRefEntry parameterRef="HIT_MET"/>
 					<xtce:ParameterRefEntry parameterRef="HIT_STATUS"/>
-					<xtce:ParameterRefEntry parameterRef="HIT_RESERVED"/>
-					<xtce:ParameterRefEntry parameterRef="HIT_COUNTER"/>
+					<xtce:ParameterRefEntry parameterRef="HIT_SPARE"/>
+					<xtce:ParameterRefEntry parameterRef="HIT_SUBCOM"/>
 					<xtce:ParameterRefEntry parameterRef="HIT_FAST_RATE_1"/>
 					<xtce:ParameterRefEntry parameterRef="HIT_FAST_RATE_2"/>
 					<xtce:ParameterRefEntry parameterRef="HIT_SLOW_RATE"/>