QX/T 417-2018 in English

Standard Background and Significance

As my country's first industry specification for the application of the BeiDou satellite navigation system in meteorology, this standard fills a gap in standards for meteorological data transmission in emergency communications scenarios. With the widespread adoption of BeiDou meteorological communication terminals, this standard provides a disaster-resistant communication solution for meteorological observation networks.

Analysis of the Core Transmission Mechanism

4.1 Information Classification System

5.1 Data Packetization Technology

The 106-byte length limit of BeiDou short messages has spawned an innovative packetization solution:

Key Technology Implementation

6.2 Intelligent Retransmission Mechanism

Data integrity is ensured through three levels of assurance:

1. The first and last packets are actively retransmitted at a 2-minute interval (up to 2 times)
2. A broadcast instruction is triggered when an intermediate packet is lost (format example: 020006030AA1)
3. Upon receiving the instruction, the sender initiates directional retransmission (up to 3 times)

Implementation Recommendations

Key Points for Equipment Selection

• Select a BeiDou-3 terminal that supports RDSS services
• Verify the compatibility of the maximum length of a single terminal packet with the standard 106 bytes
• Ensure authorization for group users with the broadcast function

Data Optimization Strategy

Transmission optimization solutions for common meteorological data types: