TrajectoryLite is a professional iOS track recording app that accurately records and manages GPS track data. The app uses the WGS-84 coordinate system for data storage and the GCJ-02 coordinate system for map display.

### Core Features
- **Real-time Track Recording**: High-precision GPS positioning, real-time location tracking
- **Multi-dimensional Data Collection**: Record longitude, latitude, altitude, speed, and timestamps
- **Historical Track Storage**: Local data persistence
- **Trajectory Visualization**: Real-time display and playback of track routes on a map
- **Data Export**: Supports GPX and CSV export formats
- **Intelligent Data Filtering**: Kalman filter algorithm optimizes GPS data accuracy

#### Positioning Technology
- High-precision GPS positioning (accuracy requirement ≤ 30 meters)
- Kalman filter algorithm for data smoothing
- Intelligent data validation and anomaly filtering
- Background positioning support

#### Data Management
- Real-time data caching and optimization
- Track statistics analysis (distance, speed, duration, etc.)