JT/T 377-2020 in English
VALIDBroadcasting standards of marine radio beacon-differential global navigation satellite system
- Issued on:2020-12-30
- Implemented on:2021-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
Price(USD)：
$340.00
$330.00
$330.00
| Standard No: | JT/T 377-2020 |
| Document status: | VALID |
| Title in English: | Broadcasting standards of marine radio beacon-differential global navigation satellite system |
| Title in Chinese: | 沿海无线电指向标-差分全球卫星导航系统播发标准 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-12-30 |
| Implemented on: | 2021-03-01 |
| Superseding: |
JT/T 377-1998 Broadcasting standards of marine radio beacon -- Differential global positioning system
|
| Professional Classification: | JT-Transport |
| Related Topics: | Navigation System
satellite navigation radio standard radio standardization difference pointer difference+ Global Engineering Frontiers 20 Global Engineering Frontiers Standard Power Generation System coastal navigation Satellite standard solder |
Introduction
Standard Evolution and Technology Upgrade
| Technical Dimensions | 1998 Edition (DGPS) | 2020 Edition (DGNSS) | Upgrade Highlights |
|---|---|---|---|
| System Architecture | Single GPS Differential | Beidou/GPS Dual Mode | New Message Types 41/42/43 Support BDS |
| Station Composition | Base Station + Transmitter Station | Base Station + Transmitter Station +Integrity Monitoring Station | Dual-machine hot backup requirements |
| Message types | 6 types | 11 types | New types 27/41-43/59 |
Analysis of core technical requirements
1. Station architecture
Chapter 4 of the standard stipulates that a station consists of a reference station, a transmitter and a integrity monitoring station. The key indicators include:
- Equipment redundancy: dual-machine hot backup design is recommended
- Coverage: 300km radius at sea (signal field strength ≥75μV/m)
- Time and frequency reference: Beijing time, coordinate system is CGCS2000
2. Message Protocol
Chapter 5 specifies 11 types of message formats, including Beidou-related message characteristics:
| Message type | Content | Beidou-specific parameters |
|---|---|---|
| 41 | BDS pseudorange correction number | BDS system ID (0110), signal ID (7 types), IOD algorithm |
| 43 | BDS constellation health status | Carrier-to-noise ratio 25-55dB-Hz, health status warning |
Implementation Suggestions
1. Station Construction
- Give priority to integer frequencies of 285-325kHz (such as 301.5/307.5kHz)
- Transmission characteristics must meet the following requirements: MSK modulation, 200bps rate, phase noise <-80dBc/Hz
- Integer monitoring stations should be deployed independently, with an alarm time of ≤2s
2. User Terminals
The principles for selecting stations according to Appendix B:
- Give priority to stations with a distance of ≤300km and the strongest signal
- Switch stations when HDOP≥2.3
- Pseudorange corrections must be reinitialized if they exceed 30 seconds
Sample only — not a preview of JT/T 377-2020
Loading PDF document...
Error loading PDF. Please make sure the file is valid and try again.
We also recommend
-
JT/T 428.1-2000 in English
Specification for manual and electric barriers.Part 1:Electric barriers
2000-10-27 -
JT/T 765.4-2016 in English
Developing Standard for Electronic Navigational Chart of the Changjiang River - Part 4: Validation Checks
2016-04-08 -
JT/T 1440-2022 in English
Operation requirements for unmanned aircraft logistics distribution
2022-09-13
