GB/T 43373-2023 (English Version)

Standard No.: GB/T 43373-2023
Language: Chinese, Available in English version
Release Date: 2023
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 43373-2023

Scope: The requirements for pseudo-code pattern, ground station uplink processing, spacecraft processing, and ground station downlink processing of deep space tracking and control regeneration/forwarding pseudo-code ranging are applicable to the design of spacecraft and ground tracking and control equipment, space-ground interface design using deep space tracking and control regeneration/forwarding pseudo-code ranging technology, and reference for near-ground tracking and control

Introduction

Interpretation of the National Standard of the People's Republic of China GB/T 43373—2023

1. Background and significance of standard formulation

High-precision radio ranging is crucial for deep space navigation and radio science research. Regenerative pseudo-code ranging technology effectively avoids ranging forwarding noise and significantly improves ranging accuracy in long-distance and weak signal environments. With the increasing complexity of deep space exploration missions, standardized and clear technical requirements have become the key to international cooperation and technical compatibility.

2. Comparison of standard frameworks

Technical requirements	Regenerated pseudo code ranging	Forwarded pseudo code ranging
Pseudo code pattern	T4B code, T2B code, high precision or fast capture required	Same as regenerated pseudo code requirements
Ground station processing flow	Uplink carrier tracking and signal demodulation, chip rate capture, etc.	Uplink ranging signal filtering and automatic gain control
Dynamic performance requirements	High-precision ranging, support for complex dynamic environments	Fast response, adapt to long-distance signal attenuation

3. Detailed explanation of core technology

Case: Baseband shaping and modulation of ranging pseudocode

The ranging pseudocode must meet one of the following conditions before baseband shaping:
a) The modulation index is lower than $0.3\mathrm{~rad}$
b) The chip rate is lower than $250\mathrm{kchip/s}$ and the modulation index is lower than $1.0\mathrm{rad}$

For example, the comparison of the first 10 chips of T4B code and T2B code before and after baseband shaping is shown in Figure A.1 (see Appendix A). After baseband shaping, the pseudocode is modulated on the uplink or downlink carrier to form a ranging signal.

4. Technological evolution and future prospects

With the advancement of deep space exploration missions, ranging technology will develop towards higher accuracy and lower energy consumption. Regenerative pseudo-code ranging will become the mainstream technology due to its high-precision characteristics. The design of T4B code and T2B code in the standard reflects the emphasis on adaptability to dynamic environments and rapid capture capabilities.

5. Implementation suggestions

Equipment R&D:Design and test in strict accordance with the pseudo-code code type, modulation index and chip rate requirements in the standard to ensure the consistency of the ground-ground interface.
System integration:Pay attention to the collaborative work of the ground station and the spacecraft transponder, especially in the optimization of ranging delay and jitter performance.
International cooperation:Actively participate in the formulation of international standards and promote the global compatibility of deep space tracking and control technology.

GB/T 43373-2023 Referenced Document

GB/T 42041 Space terminology—Space data and information transfer

GB/T 43373-2023 history

2023 GB/T 43373-2023 Technical requirements for pseudo-code ranging for deep space measurement and control of space data and information transmission systems