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JT/T 1276-2019: Technical specification on the use of binary information of automatic identification system in China
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Basic data

Standard ID JT/T 1276-2019 (JT/T1276-2019)
Description (Translated English) Technical specification on the use of binary information of automatic identification system in China
Sector / Industry Highway & Transportation Industry Standard (Recommended)
Classification of Chinese Standard R28
Classification of International Standard 03.220.40
Word Count Estimation 69,622
Date of Issue 2019
Date of Implementation 2019-10-01
Issuing agency(ies) Ministry of Transport
Summary This standard specifies the structure, classification and coding rules of automatic identification system (AIS) Chinese regional binary application information. This standard applies to related equipment and systems that use AIS system to broadcast or receive binary message information in coastal waters of China.

JT/T 1276-2019: Technical specification on the use of binary information of automatic identification system in China


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Technical specification on the use of binary information of automatic identification system in China

Contents

Foreword Ⅱ 1 Scope 1 2 Normative references 1 3 Abbreviations 1 4 binary message structure 1 5 Binary Application Information Type 4 6 Binary application information coding requirements 5 Appendix A (informative) Serial statement requirements 55 Appendix B (Informative) Chinese Specification 62 References 66 JT/T 1276-2019

Foreword

This standard is in accordance with GB/T Draft the rules given in 1-2009. This standard is proposed by and under the jurisdiction of the Technical Committee for Transportation Aerial Survey Standardization. This standard was drafted. Tianjin Maritime Safety Administration of the People's Republic of China, Beijing Shengcheng Ebon Communication Technology Co., Ltd. The main drafters of this standard. Shen Zhijiang, Hu Wei, Hou Anjian, Yao Gaole, Zhang Sanxi, Fu Chunyu, Zhang Xin, Geng Xiongfei, and Zhang Mingrui. JT/T 1276-2019 Automatic Identification System (AIS) China Regional Binary Information Technology Specification

1 Scope

This standard specifies the structure, classification, and coding rules of binary application information for the Automatic Identification System (AIS) in China. This standard applies to related equipment and systems in China's coastal waters that use the AIS system to broadcast or receive binary message information.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. IEC 61162⁃1..2010 Digital interface for marine navigation and radio communication equipment and systems-Part 1. Single-channel microphones and multiple channels Microphone (Single Talker and Mulliples Listers) ITUZR M. 1371 ~ 5 Technical characteristics of automatic identification system using time division multiple access in the VHF maritime mobile band (Technical chracteristics for an mobil band

3 Acronyms

The following abbreviations apply to this document. ABK. Addressing Binary Broadcast Acknowledgment (Adreed Bind Acknowledgement) ABM. Addressing Binary Security-Related Messages (Adrysed Message) AIS. Automated Ship Identification System (Automatic Identification System) AI. Application identifier (Applicator Identifier) BBM. Broadcast Binary Message (Broadcast Message) CRC. Cyclic Redundancy Check DAC. Assigned Area Code DGPS. Differential Global Positioning System (Global Positioning System) FI. Function Identifier HDLC. Advanced Data Link Control (Higzvelve Data Link Controll) IMO. International Maritime Organization (Marginium Organza) MSI. Maritime Mobile Communication Service Identification Code (Maritime Mobile Service IDenty) RBN. Radio Beacon VDM. VHF Data Link Message (VHF Datagram) VDO. VHF data link own ship message (VHF Data @ link Onsel Vessel Message) VHF. Very High Frequency (Very High Frequency)

4 binary message structure

4． 1 General Binary messages refer to ITUR M. Messages 6 and 8 as defined by 1371⁃5. Message 6 is a binary addressing message, message 8 JT/T 1276-2019 The text is a binary broadcast message, and its message format should conform to ITUR M. Provisions of 1371 ~ 5. The serial data interface between the binary information systems shall meet the requirements of IEC 6116⁃1..2010. For the requirements of serial statements, see Appendix A. 4． 2 Binary message format A binary message consists of three parts. --- Standard AIS data frame format; --- Application Identifier (AI); --- Application data (variable length). The combination of the application identifier and the application data constitutes binary application information. The format of No. 6 message is shown in Table 1, and the format of No. 8 message is shown in Table 2. Table 16 Message Format Message format parameter number of bits (bit) Data frame header of standard AIS Rising Phase 8 Synchronization sequence 24 Frame start bit 8 according to HDLC (7Eh) Message ID 66 Message identifier; fixed to 6 Forward indicator 2 Used by the repeater to indicate how many times the message has been forwarded. 0. default value; 3. no longer forward Source ID 30 MSI number of source station Serial number 2 0⁃3 Destination ID 30 The MSI number of the destination station Retransmission flag 1 The retransmission flag should be set according to the retransmission situation. 0. default value; 1. retransmitted Spare fill bit 1 is not used. Should be set to zero. Reserved for future use Binary application information Application identifier 16 Application data Data frame tail of standard AIS Check digit 16 CRC check End-of-frame bit 8 according to HDLC (7Eh) Buffer bits 24-bit padding, distance delay, repeater delay, and jitter Table 2 Message format 8 Message format parameter bit number (bit) rules Data frame header of standard AIS Rising Phase 8 Synchronization sequence 24 Frame start bit 8 according to HDLC (7Eh) Message ID 68 Message identifier; fixed to 8 Forward indicator 2 Used by the repeater to indicate how many times the message has been forwarded. 0. default value; 3. no longer forward JT/T 1276-2019 Table 2 (continued) Message format parameter bit number (bit) rules Data frame header of standard AIS Source ID 30 MSI number of source station Spare fill bit 2 is not used. Should be set to zero. Reserved for future use Binary application information Application identifier 16 Application data Data frame tail of standard AIS Check digit 16 CRC check End-of-frame bit 8 according to HDLC (7Eh) Buffer bits 24-bit padding, distance delay, repeater delay, and jitter 4． 3 Application identifier 4． 3． 1 AI AI identifies the type of binary application information, consisting of DAC and FI, with a total length of 16 bits, of which DAC is 10 bits and FI For 6bit. 4． 3． 2 DAC DAC is a field of 10 bits in length. According to IMO regulations, the DAC allocated to China is 412, 413, and 414. 4． 3． 3 FI FI is a 6 bit field that indicates the type of binary application information. 4． 4 Slot occupation requirements The number of time slots of a binary message is determined by the length of the binary message (including the application identifier and application data). Use fewer timeslots and take full advantage of the length of the data bytes. The number of timeslots occupied by No. 6 and No. 8 messages should conform to ITURM. 1371 ~ 5 requirements. See the requirements for the number of timeslots in message 6 Table 3 and Table 8 refer to Table 4 for the number of timeslot occupation requirements. Table 3 Number of time slots occupied by No. 6 message Number of time slots maximum binary data bytes (B) JT/T 1276-2019 Table 4 Number of time slots occupied by No. 8 message Number of time slots maximum binary data bytes (B)

5 binary application information types

Table 5 shows the 22 types of binary application information types defined in China. Table 5 Types of binary application information in China DAC FI Application Information Type Message No. 6 Message No. 8 412 00 spare spare spare 412 01 Marine weather forecast support 412 02 Marine Environment Forecast Support 412 03 Marine weather warning support 412 04 Hydrological and Meteorological Forecasting Support 412 05 Navigation support working status support 412 06 Obstacle information support 412 07 Support for water and underwater activities 412 08 Marine towing support support 412 09 Support for military activities 412 10 Ship distress support 412 11 Delineated area (circular, rectangular) Supported 412 12 Demarcation area (irregular) Support Support 412 13 Meteorological information collection support is not supported 412 14 Route recommendation (ship request) Supported Not supported 412 15 Route recommended support not supported 412 16 Route weather (ship request) Supported Not supported 412 17 Route weather support is not supported 412 18 Expansion of ship static data and navigation-related information (report request) Supported Not supported 412 19 Ship report support not supported 412 20 ～ 24 Spare Spare Spare 412 25 Beacon Telemetry Remote Control Support Not Supported 412 26 ~ 63 Standby Standby JT/T 1276-2019 Table 5 (continued) DAC FI Application Information Type Message No. 6 Message No. 8 413 01 14-bit Chinese encoding support support 413 02 13-bit Chinese encoding support support 413 03 ～ 63 Standby Standby 414 000 to 63

6 binary application information coding requirements

6. Message No. 16 6. 1． 1 Marine weather forecast 6. 1． 1． 1 Table 6 shows the coding rules for marine weather forecasting. The main meteorological elements are. weather phenomenon, wind speed, wind direction, temperature, pressure, visibility. According to this rule, each message can release weather forecast information for a maximum of 14 locations. Table 6 Coding rules for marine weather forecast Parameter bit number (bit) rule DAC 10 412 FI 6 01 Forecast time 50 ～ 23, with the whole time as the forecast point Weather Phenomena # 1 5 The coding range of weather phenomena is 1 to 31 (see Table 7). Longitude # 1 13 Unit. minute, applicable range. 60 ° E to 180 ° E, the base is 60 ° E, and the interval is 1 ′ Latitude # 1 13 Unit. minute, applicable range. 50 ° S to 70 ° N, base is 50 ° S, interval is 1 ′ Wind speed # 17 7 Unit. knots, applicable range. 0kn ~ 120kn, it is invalid to exceed 120kn Wind direction # 19 Unit. Degree, Applicable range. 0 °--359 °, invalid beyond the range Temperature # 1 11 Unit. Celsius, Application range.-60. 0 ℃ ～ 60. 0 ° C, with an interval of 0. 1 ° C, invalid beyond the range Pressure # 19 Unit. 100 Pa, Applicable range. 800hPa ~ 1200hPa, the base is 800hPa, and the interval is 1hPa Visibility # 18 8 Unit. nautical miles, scope of application. 0n mille ~ 25. 0n mille with an interval of 0. 1n mille Weather Phenomena # 25 5 The coding range of weather phenomena is 1 to 31 (see Table 7). Longitude # 2 7 Incremental method, taking longitude # 1 as the base and 1 ′ as an increment unit, taking +1 to +59, others are invalid, The first bit is a flag, 0 is positive, 1 is negative Latitude # 27 7 adopts the incremental method, taking latitude # 1 as the base and 1 ′ as an increment unit, taking +1 to +59, the others are invalid Wind speed # 27 7 Unit. knots, applicable range. 0kn ~ 120kn, it is invalid to exceed 120kn Wind direction # 29 9 Unit. degree, applicable range. 0 ° ~ 359 °, beyond the range is invalid Temperature # 2 11 Unit. Celsius, Application range.-60. 0 ℃ ～ 60. 0 ° C, with an interval of 0. 1 ° C, invalid beyond the range Pressure # 29 Unit. 100 Pa, Applicable range. 800hPa ~ 1200hPa, the base is 800hPa, and the interval is 1hPa Visibility # 28 8 Unit. nautical miles, scope of application. 0. 0n mille ~ 25. 0n mille with an interval of 0. 1n mille JT/T 1276-2019 Table 6 (continued) Parameter bit number (bit) rule Weather phenomenon #n 5 The weather phenomenon code range is 1 to 31 (see Table 7), beyond the range is invalid Longitude #n 7 Incremental method, with longitude #n-1 as the base and 1 ′ as an increment unit, take +1 to +59, others invalid Latitude #n 7 Incremental method, with latitude #n-1 as the base and 1 ′ as an increment unit, take +1 to +59, others invalid Wind speed #n 7 Unit. knots, applicable range. 0k ~ 120kn, more than 120kn is invalid Wind direction #n 9 Unit. degree, applicable range. 0 ° to 359 °, invalid beyond the range Temperature #n 11 Unit. Celsius, Application range.-60. 0 ℃ ～ 60. 0 ° C, with an interval of 0. 1 ° C, invalid beyond the range Pressure #n 9 Unit. 100 Pa, Applicable range. 800hPa ～ 1200hPa, the base is 800hPa, and the interval is 1hPa Visibility #n 8 Unit. nautical miles, scope of application. 0. 0n mille ~ 25. 0n mille with an interval of 0. 1n mille Source of information 31 1. China Meteorological Administration, 2. China Ocean Administration, 3. China Maritime Safety Administration, 4-8 Spare padding bits 0 to 7 are set to 0 when they are padded, and are dynamically padded by the value of n. Not used for whole bytes. Total number of bits 99 + (n-1) × 63 + (0 to 7) 0 < n < 5 occupies 2 time slots; 5≤n ＜ 8 occupy 3 time slots; 8≤n ＜ 12 occupy 4 time slots; 12≤n ＜ 15 occupy 5 time slots Note. There is no special note, negative numbers are expressed in two's complement. 6. 1． 1． 2 Table 7 shows the coding rules for weather phenomena. Table 7 Coding rules for weather phenomena Code weather phenomenon 1 sunny 12 heavy rain 23 moderate to heavy rain 2 Cloudy 13 Heavy rain 24 Heavy rain 3 Overcast 14 Snow showers 25 Heavy rain to heavy rain 4 showers 15 light snow 26 heavy rain to extreme rain 5 Thunder showers 16 Medium snow 27 Light to medium snow 6 Thunder showers with hail 17 Heavy snow 28 Heavy snow 7 Sleet 18 Blizzard 29 Heavy snow to blizzard 8 light rain 19 fog 30 dust 9 moderate rain 20 freezing rain 31 sand 10 heavy rain 21 sand storm 11 heavy rain 22 light rain to moderate rain 6. 1． 2 Marine Environment Forecast 6. 1． 2． 1 Table 8 gives the coding rules for the marine environment forecast. The main meteorological elements are. velocity, flow direction, wave height, wave direction, and sea temperature. root JT/T 1276-2019 According to this rule, each message can release weather forecast information for a maximum of 16 locations. Table 8 Coding rules for marine environment prediction Parameter bit number (bit) rule DAC 10 412 FI 6 02 Forecast time 5 Take the whole time as the forecast point, take 0 ～ 23 Longitude # 1 13 Unit. minute, applicable range. 60 ° E ~ 180 ° E, interval is 1 ′, base is 60 ° E Latitude # 1 13 Unit. minute, applicable range. 50 ° S to 70 ° N, interval is 1 ′, base is 50 ° S Velocity # 18 Unit. knots, scope of application. 0. 0kn ~ 25. 0kn with an interval of 0. 1kn, invalid beyond the range Flow direction # 19 Unit. Degree, Applicable range. 0 ° to 359 °, beyond the range is invalid Wave height # 18 Unit. meter, applicable range. 0. 0m to 25. 0m, with an interval of 0. 1m, invalid beyond the range Wave direction # 19 Unit. Degree, Applicable range. 0 ° ~ 359 °, it is invalid beyond the range SST # 1 11 Unit. Celsius, Scope of Application.-10. 0 ℃ ～ 60. 0 ° C, with an interval of 0. 1 ° C, invalid beyond the range Longitude # 27 Uses the incremental method, taking longitude # 1 as the base and 1 ′ as an increment unit, taking +1 to +59, and the others are invalid Latitude # 27 7 adopts the incremental method, taking latitude # 1 as the base and 1 ′ as an increment unit, taking +1 to +59, the others are invalid Flow rate # 28. 0kn ~ 25. 0kn with an interval of 0. 1kn, invalid beyond the range Flow direction # 29 9 Unit. Degree, Applicable range. 0 ° ~ 359 °, invalid beyond the range Wave height # 28 Unit. meter, applicable range. 0. 0m to 25. 0m, with an interval of 0. 1m, invalid beyond the range Wave direction # 29 9 Unit. degree, applicable range. 0 ° to 359 °, beyond the range is invalid SST # 2 11 Unit. Celsius, Scope of Application.-10. 0 ℃ ～ 60. 0 ° C, with an interval of 0. 1 ° C, invalid beyond the range Longitude #n 7 Incremental method, with longitude #n-1 as the base and 1 ′ as an increment unit, take +1 to +59, others invalid Latitude #n 7 Incremental method, with latitude #n-1 as the base and 1 ′ as an increment unit, take +1 to +59, others invalid Flow rate #n 8 Units. knots, scope of application. 0. 0kn ~ 25. 0kn with an interval of 0. 1kn, invalid beyond the range Flow direction #n 9 Unit. degree, applicable range. 0 ° to 359 °, invalid beyond the range Wave height #n 8 Unit. meter, applicable range. 0. 0m to 25. 0m, with an interval of 0. 1m, invalid beyond the range Wave direction #n 9 Unit. Degree, Applicable range. 0 ° to 359 °, beyond the range is invalid SST #n 11 Unit. Celsius, Scope of application.-10． 0 ℃ ～ 60. 0 ° C, with an interval of 0. 1 ° C, invalid beyond the range Source of information 31 1. China Meteorological Administration, 2. China Ocean Administration, 3. China Maritime Safety Administration, 4-8 Spare padding bits 0 to 7 are set to 0 when they are padded, and are dynamically padded by the value of n. Not used for whole bytes. Total number of bits 95 + (n-1) × 59 + (0 to 7) 0 < n < 5 occupies 2 time slots; 5≤n ＜ 9 occupy 3 time slots; 9≤n ＜ 12 occupy 4 time slots; 12≤n ＜ 16 occupy 5 time slots JT/T 1276-2019 6. 1． 3 Marine Meteorological Warning 6. 1． 3． 1 Table 9 shows the coding rules for marine meteorological warnings. The main types of meteorological warnings are. tropical cyclones, high wind warning, and big wave warning. Police, fog early warning, storm surge, ice condition early warning, cold wave early warning. Table 9 Codes for marine meteorological warnings Parameter bit number (bit) rule DAC 10 412 FI 6 03 Early warning type 4 1 to 15.0 Not used, 1. tropical cyclone; 2. early warning of high winds; 3. early warning of big waves; 4. early warning of fog; 5. storm surge; 6. Early warning of ice conditions; 7. Early warning of cold waves Early warning description 96 See Table 10 for tropical cyclone coding rules; The gale warning code rules are shown in Table 12; The big wave early warning coding rules are shown in Table 13; The fog early warning coding rules are shown in Table 14. The storm surge warning code rules are shown in Table 15; See Table 16 for ice condition warning coding rules; Cold wave early warning coding rules are shown in Table 17. Early warning time 20 Month, day, hour, and minute. Unnecessary units are filled with 0 placeholders; 0 to 3 digits. monthly range 1 to 12 (13 to 15 are not used); 4 to 8 digits. daily range 1 to 31 (32 not used); 9 to 13 digits. hour range 0 to 23 (24 to 31 are not used); 14 to 19 digits. minute range 0 to 59 (60 to 63 are not used) Early warning time limit 6 Unit. hour, applicable range. 0h to 48h Source of information 31 1. China Meteorological Administration; 2. China Ocean Administration; 3. China Maritime Administration; 4 to 8 Reserved Spare padding 5's complement code, set to 0 Total number of bits 150 occupies 2 time slots 6. 1． 3． 2 Table 10 shows the tropical cyclone coding rules. Table 10 Tropical cyclone coding rules Parameter bit number (bit) rule Center position longitude 23 Unit. minute, applicable range. longitude 60 ° E ~ 180 ° E, interval is 0..2001 ′, the base is 60 ° E Center position latitude 23 Unit. minute, applicable range. latitude 50 ° S ~ 70 ° N, interval is 0..2001 ′, the base is 50 ° S Cyclone Type 3 See Table 11 for coding rules for cyclone types Class 8 wind circle radius 9 Unit. km, Applicable range. 1km to 500km, invalid for more than 500km Class 10 wind circle radius 9 Unit. km, applicable range. 1km to 500km, invalid for more than 500km Movement speed 6 Unit. km/h, Applicable range. 1km/h to 63km/h, invalid for more than 63km/h Direction of movement 9 Unit. degree, applicable range. 0 ° to 359 °, exceeding the range is considered invalid JT/T 1276-2019 Table 10 (continued) Parameter bit number (bit) rule Maximum wind near the center 5 units. level, take level 1 to level 20, exceeding the range is considered invalid Central pressure 9 Unit. 100 Pa, take 800 hPa ~ 1.200 hPa, the base is 800 hPa, and the interval is 1 hPa Total number of bits 96 6. 1． 3． 3 Table 11 shows the coding rules for cyclone types. Table 11 Cyclone type coding rules Code Tropical Cyclone Class Maximum average wind speed near the center of the ground floor (M/s) Maximum wind near the center of the ground floor (level) 1 Tropical depression (TD) 8 to 17. 16 to 7 2 Tropical Storms (TS) 2 to 24. 4 8 ～ 9 3 Severe Tropical Storm (STS) 24. 5 to 32. 6 10 ～ 11 4 Typhoon (TY) 7 to 41. 4 12 ～ 13 5 Strong Typhoon (STZ) 41. 5 to 50. 9 14 ～ 15 6 Super typhoon (SuperTQ) ≥ 51. 0 16 or above 6. 1． 3． 4 Table 12 shows the coding rules for gale warning. Table 12 Gale warning coding rules Parameter bit number (bit) rule Center position longitude 23 Unit. minute, applicable range. longitude 60 ° E ~ 180 ° E, interval is 0..2001 ′, the base is 60 ° E Center position latitude 23 Unit. minute, applicable range. latitude 50 ° S ~ 70 ° N, interval is 0..2001 ′, the base is 50 ° S Radius 8 Unit. nautical miles, Applicable range. 1n milli to 250n milli, invalid for 250n milli or more Minimum wind 5 units. level, take level 1 to level 20, exceeding the range is considered invalid Maximum wind 5 units. level, take level 1 to level 20, exceeding the range is considered invalid Wind direction 4 Take 1 to 8, 1. East wind, 2. Southeast wind, 3. South wind, 4. Southwest wind, 5. West wind, 6. Northwest wind, 7. North wind, 8. East North wind Fill in 28 Fill in 28 Total number of bits 96 6. 1． 3． 5 Table 13 shows the rules for coding the big wave warning. Table 13 Big Wave Early Warning Coding Rules Parameter bit number (bit) rule Center position longitude 23 Unit. minute, applicable range. longitude 60 ° E ~ 180 ° E, interval is 0..2001 ′, the base is 60 ° E Center position latitude 23 Unit. minute, applicable range. latitude 50 ° S ~ 70 ° N, interval is 0..2001 ′, the base is 50 ° S JT/T 1276-2019 Table 13 (continued) Parameter bit number (bit) rule Radius 8 Unit. km, Applicable range. 1n mille to 250km, invalid for more than 250km Wave height 5 Unit. meter, applicable range. 1m to 31m, beyond the range is considered invalid Wave period 13 Unit. second, applicable range. 1s to 3600s, exceeding the range is considered invalid Complement 24 complement 24 Total number of bits 96 6. 1． 3． 6 Table 14 gives the rules of the fog early warning coding. Table 14 Fog warning coding rules Parameter bit number (bit) rule Center position longitude 23 Unit. minute, applicable range. 60 ° E ~ 180 ° E, interval is 0..2001 ′, the base is 60 ° E Center position latitude 23 Unit. minute, applicable range. 50 ° S ~ 70 ° N, interval is 0..2001 ′, the base is 50 ° S Radius 9 Unit. km, take 1km to 500km, it is invalid for more than 500km Visibility 8 Unit. nautical miles, take 0. 0n mille ~ 25. 0n mille with an interval of 0. 1n mille Fill in 33 Fill in 33 Total number of bits 96 6. 1． 3． 7 Table 15 shows the coding rules for storm surge warning. Table 15 Codes for storm surge warning codes Parameter bit number (bit) rule Center position longitude 23 Unit. minute, applicable range. longitude 60 ° E ~ 180 ° E, interval is 0..2001 ′, the base is 60 ° E Center position latitude 23 Unit. minute, applicable range. latitude 50 ° S ~ 70 ° N, interval is 0..2001 ′, the base is 50 ° S Radius 9 Unit. Nautical miles, take 1n mille to 500n mille, 500n mille or more is invalid Add 9 units of water. cm, take 1cm to 500cm, beyond the range will be considered invalid Tide level 10 Unit. cm, take 1cm to 1000cm, beyond the range is considered invalid Wave period 13 Unit. second, take 1s ~ 3600s, beyond the range is considered invalid Complement 9 complement 9 0 Total number of bits 96 6. 1． 3． 8 Table 16 shows the rules for coding ice warnings. Table 16 Ice condition early warning coding rules Parameter bit number (bit) rule Center position longitude 23 Applicable range. longitude 60 ° E ~ 180 ° E, with an interval of 0..2001 ′, the base is 60 ° E Center position latitude 23 Applicable range. latitude 50 ° S ~ 70 ° N, interval is 0..2001 ′, the base is 50 ° S Radius 9 Unit. km, take 1km to 500km, it is invalid if it is more than 500 JT/T 1276-2019 Table 16 (continued) Parameter bit number (bit) rule Sea ice thickness 5 units. cm, take 1cm to 30cm, if it exceeds 30cm, it will be regarded as invalid Fill 36 Fill 36 Total number of bits 96 6. 1． 3． 9 Table 17 gives the cold wave prediction coding rules. Table 17 Coding rules for cold wave forecast Parameter bit number (bit) rule Center position longitude 23 Applicable range. longitude 60 ° E ~ 180 ° E, with an interval of 0..2001 ′, the base is 60 ° E Center position latitude 23 Applicable range. latitude 50 ° S ~ 70 ° N, interval is 0..2001 ′, the base is 50 ° S Radius 9 Unit. km, take 1km to 500km, it is invalid if it is more than 500 Cold wave level 31 1. blue; 2. yellow; 3. orange; 4. red 38's complement 38's Total number of bits 96 6. 1． 4 Hydrological and meteorological forecast 6. 1． 4． 1 Table 18 gives the hydrometeorological forecasting coding rules, which mainly include tide and hydrological information. The tide provides the high tide and low tide time. Table 18 Hydrometeorological forecast coding rules Parameter bit number (bit) rule DAC 10 412 FI 6 04 Forecast time 5 Take the whole time as the forecast point, take 0 ～ 23 Longitude # 1 13 Units. minutes, take 60 ° E ~ 180 ° E, the i...

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