ais-json

A npm package about AIS (Automatic Identification System) text decoding.

Decode AIS text, then return JSON object.

npm address: https://www.npmjs.com/package/ais-json

Structure

Name | Description ---|--- index.js | main function (call decode.js and include verify ais text) encode.js | generate ascii6bit.json and num2char.json decode.js | decode ais text and return json (base on ascii6bit.json and num2char.json) ascii6bit.json | connect ascii to 6 bit code num2char.json | connect number to char

Install

npm install ais-json

Usage

In Terminal

npx ais '!AIVDM,1,1,,A,15Cgah00008LOnt>1Cf`s6NT00SU,0*3D'

Then, you will get:

{
  "MessageID": {
    "name": "消息ID",
    "data": 1,
    "info": "船位报告"
  },
  "DataIndicator": {
    "name": "转发指示符",
    "data": 0,
    "info": "默认"
  },
  "UserID": {
    "name": "用户ID(MMSI)",
    "data": 356248000,
    "info": 356248000
  },
  "NaviStatus": {
    "name": "导航状态",
    "data": 0,
    "info": "发动机使用中"
  },
  "ROT": {
    "name": "旋转速率",
    "data": "0°/min",
    "info": "0°/min"
  },
  "SOG": {
    "name": "地面航速",
    "data": "0节",
    "info": "0节"
  },
  "Accuracy": {
    "name": "地面航速",
    "data": 0,
    "info": "高(<10m)"
  },
  "Location": {
    "name": "坐标",
    "data": [118.07354333333333, 24.502496666666666],
    "info": "E 118°4.4126′ , N 24°30.1498′"
  },
  "COG": {
    "name": "地面航线",
    "data": "228.4°",
    "info": "228.4°"
  },
  "Heading": {
    "name": "实际航向",
    "data": "207°",
    "info": "207°"
  },
  "Second": {
    "name": "时戳",
    "data": 18,
    "info": "18 seconds past the minute"
  },
  "RegionalApplication": {
    "name": "特定操纵指示符",
    "data": 0,
    "info": "不可用"
  },
  "Spare": {
    "name": "备用",
    "data": 0,
    "info": "未使用"
  },
  "RAIM": {
    "name": "RAIM",
    "data": 0,
    "info": "RAIM未使用"
  },
  "CommunicationState": {
    "name": "通信状态",
    "data": "0000000100011100101",
    "info": "SOTDMA 4:57 UTC"
  },
  "text": "!AIVDM,1,1,,A,15Cgah00008LOnt>1Cf`s6NT00SU,0*3D"
}

In Project

Decode AIS Text

# const ais = require('ais-json')
import ais from 'ais-json'
let aisinfo = ais('!AIVDM,1,1,,A,15Cgah00008LOnt>1Cf`s6NT00SU,0*3D')

Open SerialPort

If you need it.

node-serialport

cd ais-json
node serialport

Default

Port: COM3
BaudRate: 38400

Encode Table

cd ais-json
node encode

Generate ascii6bit.json and num2char.json.

Intend

• [ ] CLI