Contents
1 Introduction
1.1 Basic Concept of Spacecraft Autonomous Navigation System
1.1.1 Definition of Spacecraft Autonomous Navigation System
1.1.2 Necessity of Autonomous Navigation Systems
1.2 Three Main Types of Spacecraft Autonomous Navigation Systems
1.2.1 Inertial Navigation System
1.2.2 Celestial Navigation System
1.2.3 Navigation Satellite System
1.3 Review of X-Ray Pulsar-Based Navigation
1.3.1 Brief Introduction of Pulsar
1.3.2 Brief Introduction of X-Ray Pulsar-Based Navigation
1.3.3 Famous Programs on XPNAV
1.3.4 Progresses of Key Techniques
References
2 Fundamential of the X-Ray Pulsar-Based Navigation
2.1 Space-Time Reference Frame
2.1.1 Coordinate System
2.1.2 General Relativistic Time System
2.2 Timing Model
2.2.1 Time and Phase Model
2.2.2 Time Transfer Model
2.3 Spacecraft Orbital Dynamics and Attitude Dynamics Models
2.3.1 Spacecraft Orbital Dynamics Model
2.3.2 Spacecraft Attitude Dynamics Model
2.4 X-Ray Pulsar-Based Spacecraft itioning
2.4.1 Basic Principle
2.4.2 Working Flow
2.4.3 Analysis on the X-Ray Detector Configuration Scheme
2.5 X-Ray Pulsar-Based Spacecraft Time Keeping
2.5.1 Basic Principle
2.5.2 System Equation
2.5.3 Feasibility Analysis of Time-Keeping via the Observation of One Pulsar
2.6 X-Ray Pulsar-Based Spacecraft Attitude Determination
2.6.1 Basic Principle
2.6.2 Means of Realizing Direction via the Observation of Pulsar
References
3 X-Ray Pulsar Signal Processing
3.1 X-Ray Pulsar Signal Model
3.2 Profile Recovery
3.2.1 Epoch Folding
3.2.2 Period Search
3.2.3 Enhancing the Signal to Noise Ratio of Profile
3.3 Pulse TOA Calculation for Stationary Case
3.3.1 Pulse TOA Calculation Methods
3.3.2 Performance Analysis
3.4 Pulse TOA Calculation for Dynamics Case
3.4.1 Improved Phase Propagation Model
3.4.2 Linearized Phase Propagation Model
3.4.3 Estimation of Phase and Doppler Frequency
3.4.4 Silation Analysis
3.5 Data Processing of XPNAV-1 Data
3.5.1 Introduction of the Measured Data of XPNAV-
3.5.2 Data Processing for the Measured Data
3.6 Summary
References
4 Errors Within the Time Transfer Model and Compensation Methods for Earth-Orbing Spacecraft
4.1 Modeling of Error Sources Within Time Transfer Model
4.1.1 ition Error of Central Gravitational Body
4.1.2 ition Error of the Sun
4.1.3 ition Error of Other Celestial Bodies
4.1.4 Angular ition Error of Pulsar
4.1.5 Distance Error of Pulsar
4.1.6 Error Within Proper Motion Velocity of Pulsar
4.1.7 Error Within Spacecraft-Borne Atomic Clock
4.2 Impact of Error Sources
4.2.1 Impact of Error Sources on Time Transfer Model
4.2.2 Impact of Error Source on Template
4.2.3 Impact of Error Source on itioning Performance
4.3 Analysis of Propagation Property of Major Error Sources
4.3.1 Propagation Property of Planet Ephemeris Error
4.3.2 Propagation Property of Pulsar Angular ition Error
4.3.3 Propagation Property of Pulsar Distance Error
4.3.4 Propagation Property of Clock Error of Spacecraft-Borne Atomic Clock
4.4 Systematic Biases Compensation Method Based on Augmented State
4.4.1 Navigation System
4.4.2 Observability Analysis
4.4.3 Silation Analysis
4.5 Systematic Biases Compensation Method Based on Time-Differenced Measurement
4.5.1 Time-Differenced Measurement Model
4.5.2 Observability Analysis
4.5.3 Modified Unscented Kalman Filter
4.5.4 Silation Analysis
4.6 Summary
References
5 X-Ray Pulsar/ltiple Measurement Information Fused Navigation
5.1 XNAV/CNS Integrated Navigation Framework
5.1.1 Traditional Celestial Measurement Model
5.1.2 Information Fusion Method
5.1.3 Error Comp