# Post-Launch Monitoring Checklist

## Overview
Comprehensive monitoring checklist for spacecraft post-launch operations including trajectory verification, system health monitoring, abort procedures, and contingency planning.

## 1. Trajectory Verification

### Immediate Post-Launch (T+0 to T+30 minutes)
- [ ] **Launch Vehicle Separation Confirmation**
  - Verify mechanical separation signals
  - Confirm solar array deployment
  - Check communication system activation
  
- [ ] **Initial Orbit Determination**
  - First orbit determination via ground station tracking
  - Compare achieved vs. predicted orbital parameters
  - Velocity vector verification
  - Altitude and inclination confirmation

### Early Orbit Phase (T+30min to T+24h)
- [ ] **Orbital Parameter Tracking**
  - Semi-major axis: [ ] Within ±0.1% of target
  - Eccentricity: [ ] Within design tolerance
  - Inclination: [ ] Within ±0.01°
  - RAAN: [ ] Within tolerance
  - Argument of perigee: [ ] Confirmed

- [ ] **Ground Track Verification**
  - [ ] Verify ground station pass windows
  - [ ] Confirm coverage areas match predictions
  - [ ] Validate eclipse periods

### Station Keeping Phase
- [ ] **Orbital Maintenance**
  - [ ] Daily orbital parameter updates
  - [ ] Drift analysis (≤ 0.1° per day)
  - [ ] Maneuver planning for corrections
  - [ ] Fuel budget tracking

## 2. System Status Monitoring

### Power System
```python
def power_system_check(telemetry_data):
    """Monitor power system health metrics"""
    checks = {
        'solar_array_output': {
            'current': telemetry_data.get('solar_current', 0),
            'voltage': telemetry_data.get('solar_voltage', 0),
            'status': 'OK' if 28 <= telemetry_data.get('solar_voltage', 0) <= 35 else 'WARNING'
        },
        'battery_health': {
            'charge_level': telemetry_data.get('battery_percent', 0),
            'temperature': telemetry_data.get('battery_temp', 0),
            'status': 'OK' if 20 <= telemetry_data.get('battery_percent', 0) <= 95 else 'WARNING'
        },
        'power_consumption': {
            'total_load': telemetry_data.get('total_power', 0),
            'margin': telemetry_data.get('power_margin', 0),
            'status': 'OK' if telemetry_data.get('power_margin', 0) > 0 else 'CRITICAL'
        }
    }
    return checks
```

### Communication System
- [ ] **UHF/S-Band Link**
  - [ ] Uplink signal strength: [ ] > -120 dBm
  - [ ] Downlink signal strength: [ ] > -115 dBm
  - [ ] Bit error rate: [ ] < 10^-6
  - [ ] Command reception verification

- [ ] **High-Gain Antenna**
  - [ ] Pointing accuracy: [ ] ±0.1°
  - [ ] Data rate verification
  - [ ] Link budget validation

### Attitude Control System
- [ ] **Sensor Health**
  - [ ] Star tracker: [ ] Operational
  - [ ] Sun sensor: [ ] Operational
  - [ ] Gyroscope: [ ] Calibrated
  - [ ] Magnetometer: [ ] Within range

- [ ] **Actuator Status**
  - [ ] Reaction wheels: [ ] Speed within limits
  - [ ] Magnetorquers: [ ] Current normal
  - [ ] Thrusters: [ ] Pressure adequate

### Thermal System
```python
def thermal_monitoring(thermal_data):
    """Monitor thermal subsystem health"""
    thermal_limits = {
        'electronics_bay': {'min': -10, 'max': 50, 'optimal': 20},
        'battery_pack': {'min': 0, 'max': 40, 'optimal': 15},
        'solar_arrays': {'min': -40, 'max': 85, 'optimal': 25},
        'propulsion': {'min': -20, 'max': 60, 'optimal': 20}
    }
    
    alerts = []
    for component, temps in thermal_data.items():
        if component in thermal_limits:
            limits = thermal_limits[component]
            if temps['current'] < limits['min'] or temps['current'] > limits['max']:
                alerts.append(f"CRITICAL: {component} temperature out of bounds")
            elif abs(temps['current'] - limits['optimal']) > 10:
                alerts.append(f"WARNING: {component} temperature suboptimal")
    
    return alerts
```

## 3. Abort Procedures

### Immediate Abort Scenarios
```python
class AbortProcedures:
    def __init__(self):
        self.abort_conditions = {
            'CAT_1': [  # Catastrophic - Immediate action required
                'total_power_loss',
                'complete_communication_failure', 
                'uncontrolled_spin_rate>10_deg/s',
                'structural_integrity_compromised'
            ],
            'CAT_2': [  # Critical - Action within 5 minutes
                'primary_comms_failure',
                'attitude_control_failure',
                'critical_system_overheat',
                'fuel_leak_detected'
            ],
            'CAT_3': [  # Warning - Action within 30 minutes
                'secondary_system_failure',
                'degraded_performance',
                'approaching_resource_limits'
            ]
        }
    
    def execute_abort(self, category, condition):
        """Execute appropriate abort procedure"""
        if category == 'CAT_1':
            return self.emergency_abort()
        elif category == 'CAT_2':
            return self.critical_abort(condition)
        elif category == 'CAT_3':
            return self.warning_abort(condition)
    
    def emergency_abort(self):
        """Emergency spacecraft shutdown and safe mode"""
        actions = [
            'SHUTDOWN_ALL_NON_ESSENTIAL_SYSTEMS',
            'ENTER_SAFE_MODE_ATTITUDE',
            'ACTIVATE_EMERGENCY_BEACON',
            'TRANSMIT_LAST_KNOWN_TELEMETRY',
            'ATTEMPT_GROUND_STATION_CONTACT'
        ]
        return actions
    
    def critical_abort(self, condition):
        """Critical but recoverable situation"""
        actions = [
            'SWITCH_TO_REDUNDANT_SYSTEMS',
            'REDUCE_POWER_CONSUMPTION',
            'OPTIMIZE_COMMUNICATION_WINDOWS',
            'ENABLE_DIAGNOSTIC_MODE'
        ]
        return actions
```

### Safe Mode Operations
- [ ] **Safe Mode Entry Triggers**
  - [ ] Power system anomaly
  - [ ] Attitude control loss
  - [ ] Communication failure
  - [ ] Thermal excursion

- [ ] **Safe Mode Configuration**
  - [ ] Minimum power consumption state
  - [ ] Sun-pointing attitude
  - [ ] Emergency beacon activation
  - [ ] Ground station search mode

## 4. Contingency Planning

### Failure Scenario Response Matrix

| Scenario | Detection | Immediate Response | Recovery Actions | Success Criteria |
|----------|-----------|-------------------|------------------|------------------|
| **Solar Array Failure** | Power drop >50% | Switch to battery power | Attempt array redeployment, reconfigure power distribution | Stable power from remaining arrays |
| **Computer Reset** | Telemetry interruption | Enter safe mode | Computer reboot, system health check, service restoration | Full telemetry restoration |
| **Thruster Failure** | Attitude control degradation | Switch to reaction wheels | Orbit adjustment planning, fuel conservation | Attitude control maintained |
| **Memory Corruption** | Data validation errors | Switch to redundant memory | Memory dump, system restart, data recovery | System恢复正常操作 |
| **Antenna Pointing Loss** | Communication degradation | Enter antenna search mode | Repointing attempts, backup antenna activation | Communication restored |

### Resource Contingency Planning
```python
def resource_contingency_monitor():
    """Monitor and plan for resource constraints"""
    contingency_plan = {
        'fuel_reserves': {
            'current': 85.2,  # percentage
            'critical_threshold': 20,
            'warning_threshold': 40,
            'actions': [
                'prioritize_essential_maneuvers_only',
                'optimize_trajectory_planning',
                'consider_alternative_station_keeping'
            ]
        },
        'battery_health': {
            'cycles_remaining': 45000,
            'critical_threshold': 5000,
            'warning_threshold': 10000,
            'actions': [
                'reduce_charge_discharge_cycles',
                'optimize_power_management',
                'plan_for_battery_replacement_mission'
            ]
        },
        'data_storage': {
            'available_space': 12.5,  # GB
            'critical_threshold': 2,
            'warning_threshold': 5,
            'actions': [
                'prioritize_critical_data_downlink',
                'compress_non_essential_data',
                'delete_cached_duplicate_data'
            ]
        }
    }
    return contingency_plan
```

## 5. Monitoring Automation

### Automated Alert System
```python
import datetime

class MonitoringSystem:
    def __init__(self):
        self.alert_levels = {
            'INFO': 'green',
            'WARNING': 'yellow', 
            'CRITICAL': 'orange',
            'EMERGENCY': 'red'
        }
        self.monitoring_intervals = {
            'telemetry': 1,  # seconds
            'orbit_determination': 300,  # 5 minutes
            'system_health': 60,  # 1 minute
            'resource_consumption': 3600  # 1 hour
        }
    
    def check_system_health(self, telemetry):
        """Comprehensive system health check"""
        health_status = {
            'overall_status': 'NOMINAL',
            'alerts': [],
            'recommendations': []
        }
        
        # Power system check
        if telemetry.get('battery_percent', 100) < 30:
            health_status['alerts'].append({
                'level': 'CRITICAL',
                'message': 'Battery level below 30%',
                'timestamp': datetime.datetime.now().isoformat()
            })
            health_status['overall_status'] = 'DEGRADED'
        
        # Communication check
        if telemetry.get('last_contact_minutes', 0) > 60:
            health_status['alerts'].append({
                'level': 'WARNING', 
                'message': 'No communication for >60 minutes',
                'timestamp': datetime.datetime.now().isoformat()
            })
        
        return health_status
```

## 6. Daily Operations Checklist

### Standard Daily Checks
- [ ] **Morning Operations Brief**
  - [ ] Review overnight telemetry
  - [ ] Check scheduled contacts
  - [ ] Review system health status
  - [ ] Verify orbit predictions

- [ ] **System Health Verification**
  - [ ] Power system parameters
  - [ ] Communication link quality
  - [ ] Attitude control status
  - [ ] Thermal system balance
  - [ ] Propulsion system pressures

- [ ] **Data Management**
  - [ ] Download priority data
  - [ ] Verify data integrity
  - [ ] Clear storage buffers
  - [ ] Archive critical datasets

### Weekly Reviews
- [ ] **Performance Analysis**
  - [ ] Trend analysis for all subsystems
  - [ ] Resource consumption projections
  - [ ] Maneuver planning updates
  - [ ] Contingency plan review

- [ ] **Maintenance Tasks**
  - [ ] System calibration verification
  - [ ] Backup system testing
  - [ ] Software patch management
  - [ ] Documentation updates

## 7. Emergency Contact Protocol

### Escalation Matrix
1. **Level 1: On-Call Engineer** - Initial response (15 min response time)
2. **Level 2: Mission Operations Manager** - Escalated issues (10 min response time)
3. **Level 3: Mission Director** - Critical emergencies (5 min response time)
4. **Level 4: Executive Team** - Mission-threatening events (Immediate)

### Communication Templates
```python
def generate_emergency_report(severity, issue, timestamp, data):
    """Generate standardized emergency report"""
    report = {
        'alert_level': severity,
        'issue_type': issue,
        'timestamp': timestamp,
        'telemetry_snapshot': data,
        'immediate_actions': [],
        'escalation_required': severity in ['CRITICAL', 'EMERGENCY'],
        'ground_station_contact': 'REQUIRED' if severity == 'EMERGENCY' else 'SCHEDULED'
    }
    return report
```

## 8. Training and Simulation

### Required Training
- [ ] **Abort Procedure Drills** - Quarterly
- [ ] **Failure Scenario Simulations** - Monthly
- [ ] **Emergency Communication Protocols** - Bi-annually
- [ ] **System Recovery Procedures** - Quarterly

### Simulation Scenarios
1. Total power loss recovery
2. Communication system failure
3. Attitude control system malfunction
4. Orbital deviation correction
5. Thermal system emergency

---

**Implementation Status**: Complete
**Last Updated**: 2026-02-05
**Version**: 1.0
**Next Review**: 2026-03-05