add time tag to CSS measurement message

docs/source/Support/bskReleaseNotes.rst

@@ -46,6 +46,7 @@ Version |release|
 - The fuel tank module is refactored to remove the limitation of a only being able to have a single instance of a
   specific tank model type.
 - Update Basilisk documentation build system to use latest version of ``sphinx`` and ``sphinx_rtd_theme``
+- Added time tag to :ref:`CSSArraySensorMsgPayload`
 
 
 Version 2.3.0 (April 5, 2024)

src/architecture/msgPayloadDefC/CSSArraySensorMsgPayload.h

@@ -25,6 +25,7 @@
 
 /*! @brief Output structure for CSS array or constellation interface.  Each element contains the raw measurement which should be a cosine value nominally */
 typedef struct {
+    double timeTag;                         //!< [s]   Current vehicle time-tag associated with measurements
     double CosValue[MAX_NUM_CSS_SENSORS];   //!< Current measured CSS value (ideally a cosine value) for the constellation of CSS sensors
 }CSSArraySensorMsgPayload;
 

src/simulation/sensors/coarseSunSensor/coarseSunSensor.cpp

@@ -427,6 +427,7 @@ void CSSConstellation::UpdateState(uint64_t CurrentSimNanos)
         this->outputBuffer.CosValue[itp - this->sensorList.begin()] = it->sensedValue;
 
     }
+    this->outputBuffer.timeTag = (double) (CurrentSimNanos * NANO2SEC);
     this->constellationOutMsg.write(&this->outputBuffer, this->moduleID, CurrentSimNanos);
 }