316 lines
11 KiB
Python
316 lines
11 KiB
Python
import struct
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import socket
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import time
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import random
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from random import uniform, randint
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import math
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SHIP_MMSIS = [random.randint(336295939, 336295969) for _ in range(10)]
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SHIP_STATUS = {}
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# 生成包含30艘船信息的列表（MMSI、纬度、经度、航向）
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SHIP_LIST = [
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(
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336295939 + i, # MMSI号
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round(random.uniform(30.0, 34.0), 6),
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round(random.uniform(123.5, 126.0), 6),
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random.randint(0, 359)
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) for i in range(30)
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]
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# 初始化船只状态
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for ship in SHIP_LIST:
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mmsi, init_lat, init_lon, heading = ship
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SHIP_STATUS[mmsi] = {
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'current_lat': init_lat,
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'current_lon': init_lon,
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'heading': heading,
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'speed': 280.24 #加速100倍用于演示
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}
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YANGTZE_ESTUARY_LAT = 31.23
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YANGTZE_ESTUARY_LON = 123.87
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RANGE_NM = 5 # 5海里范围
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current_lat = YANGTZE_ESTUARY_LAT # 当前纬度
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current_lon = YANGTZE_ESTUARY_LON # 当前经度
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own_heading = 90 # 固定航向 (50度)
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def generate_random_position():
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"""生成船只位置(基于当前位置和航向计算)"""
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global current_lat, current_lon, own_heading
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# 速度为10.24节(来自GPS报文设置)
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speed_knots = 300.24 #加速100倍用于演示
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# 转换为公里/小时 (1节 = 1.852公里/小时)
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speed_kmh = speed_knots * 1.852
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# 转换为公里/秒 (发送间隔为1秒)
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speed_kmps = speed_kmh / 3600
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# 计算1秒内移动的距离(公里)
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distance_km = speed_kmps * 1
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# 将航向转换为弧度
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heading_rad = math.radians(own_heading)
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# 计算纬度和经度变化
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# 1度纬度 ≈ 111公里
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delta_lat = distance_km / 111.0 * math.cos(heading_rad)
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# 1度经度 ≈ 111公里 * cos(纬度)
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delta_lon = distance_km / (111.0 * math.cos(math.radians(current_lat))) * math.sin(heading_rad)
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# 更新当前位置
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current_lat += delta_lat
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current_lon += delta_lon
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# 转换为度分格式*10^7
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longitude = int(current_lon * 10000000)
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latitude = int(current_lat * 10000000)
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return longitude, latitude
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def generate_ship_position(mmsi):
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"""根据船只MMSI生成当前位置"""
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global SHIP_STATUS
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ship = SHIP_STATUS[mmsi] #获取全局船只中的一个进行修改
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speed_knots = ship['speed']
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speed_kmh = speed_knots * 1.852
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speed_kmps = speed_kmh / 3600
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distance_km = speed_kmps * 1
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# 航向转弧度
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heading_rad = math.radians(ship['heading'])
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# 计算经纬度变化
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delta_lat = distance_km / 111.0 * math.cos(heading_rad)
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delta_lon = distance_km / (111.0 * math.cos(math.radians(ship['current_lat']))) * math.sin(heading_rad)
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# 更新船只状态
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ship['current_lat'] += delta_lat
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ship['current_lon'] += delta_lon
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# 返回新位置
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return ship['current_lon'], ship['current_lat']
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def create_tcp_packet(packet_type, content):
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"""创建符合VDES TCP协议的报文"""
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# 报文帧头 (4字节)
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header = b'####'
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# 报文类型 (4字节，大端)
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type_field = struct.pack('>I', packet_type)
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# 报文长度 (4字节，大端，内容长度)
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length = len(content)
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length_field = struct.pack('>I', length)
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# 构建完整报文
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packet = header + type_field + length_field + content
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return packet
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def create_gps_packet():
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"""创建GPS解析数据报文(类型7)的内容"""
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# 模拟GPS数据 (表11定义)
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lon, lat = generate_random_position()
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utc_time = 1680000000 # UTC时间 (8字节)
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longitude = lon # 经度 (4字节，东经120.5度)
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latitude = lat # 纬度 (4字节，北纬30.5度)
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altitude = 50 # 海拔高度 (4字节，50米)
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used_sats = 10 # 定位使用的卫星数 (2字节)
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gps_sats = 8 # GPS卫星数 (2字节)
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beidou_sats = 7 # 北斗卫星数 (2字节)
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gps_status = 1 # GPS状态 (1字节，单点定位)
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position_mode = 3 # 定位模式 (1字节，3D定位)
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hdop = 2550 # 水平精度因子 (4字节，25.5米)
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speed = 1024 # 运动速度 (4字节，10.24节)
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direction = own_heading # 运动方向 (4字节，359度)
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# 打包为二进制 (大端字节序)
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content = struct.pack(
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'>QiiiHHHBBIII', # 格式: Q(8),i(4),i(4),i(4),H(2),H(2),H(2),B(1),B(1),I(4),I(4),I(4)
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utc_time,
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longitude,
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latitude,
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altitude,
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used_sats,
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gps_sats,
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beidou_sats,
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gps_status,
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position_mode,
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hdop,
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speed,
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direction
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)
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return content
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def create_ais_info_packet(demod_content):
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"""创建解调信息报文(类型12)的内容"""
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# 模拟解调信息数据
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message_type = 12 # 消息类型 (1字节)
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satellite_id = 1 # 卫星ID (1字节)
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demodulator_id = 0 # 解调器编号 (1字节)
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demod_slot = 1234 # 解调时隙 (2字节)
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receive_delay = 5678 # 接收延迟 (2字节，单位us)
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snr = 25.75 # 信噪比 (2字节，dB)
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# 处理信噪比 (高8位整数部分，低8位小数部分)
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snr_int = int(snr)
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snr_frac = int((snr - snr_int) * 100) # 转换为0-99的小数部分
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snr_packed = (snr_int & 0xFF) << 8 | (snr_frac & 0xFF)
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# 打包为二进制 (大端字节序)
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content = struct.pack(
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'>BBBHHH', # 格式: B(1),B(1),B(1),H(2),H(2),h(2)
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message_type,
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satellite_id,
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demodulator_id,
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demod_slot,
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receive_delay,
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snr_packed
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)
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return content + demod_content
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def encode_demod_fields(SHIP_MMSI, lat, lon, heading):
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"""编码解调信息字段并打印解码结果"""
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# 初始化二进制位列表
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bits = []
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print(SHIP_MMSI, lat, lon, heading)
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# 示例数据
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message_id = 1 # 消息ID (6 bits)
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repeat_indicator = 0 # 转发指示符 (2 bits)
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user_id = SHIP_MMSI # 用户ID/MMSI (30 bits)
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navigation_status = 8 # 导航状态 (4 bits) - 航行中
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rot = -128 # 旋转速率 (8 bits) - 无信息
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sog = 102 # 地面航速 (10 bits) - 10.2节
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position_accuracy = 1 # 位置准确度 (1 bit) - 高
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longitude, latitude = lon, lat # 经纬度
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cog = heading # 地面航线 (12 bits) - 90.0°
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true_heading = heading # 实际航向 (9 bits) - 90°
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timestamp = 30 # 时戳 (6 bits) - UTC秒
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special_maneuver = 0 # 特定操纵指示符 (2 bits)
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spare = 0 # 备用 (3 bits)
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raim_flag = 0 # RAIM标志 (1 bit)
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comm_state = 0 # 通信状态 (19 bits)
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# 添加各个字段（按照协议顺序）
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bits.append(format(message_id, '06b')) # 消息ID
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bits.append(format(repeat_indicator, '02b')) # 转发指示符
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bits.append(format(user_id, '030b')) # 用户ID
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bits.append(format(navigation_status, '04b')) # 导航状态
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# 旋转速率 (8位有符号整数)
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rot_bits = rot & 0xFF
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bits.append(format(rot_bits, '08b'))
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# 地面航速 (10位)
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bits.append(format(min(sog, 1023), '010b'))
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# 位置准确度 (1位)
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bits.append(str(position_accuracy))
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# 经度 (28位)
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# 转换为1/10,000分钟单位
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longitude_min = int(longitude * 60 * 10000)
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bits.append(format(longitude_min & 0x0FFFFFFF, '028b'))
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# 纬度 (27位)
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latitude_min = int(latitude * 60 * 10000)
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bits.append(format(latitude_min & 0x07FFFFFF, '027b'))
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# 地面航线 (12位)
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bits.append(format(min(cog, 3600), '012b'))
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# 实际航向 (9位)
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bits.append(format(min(true_heading, 511), '09b'))
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# 时戳 (6位)
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bits.append(format(min(timestamp, 63), '06b'))
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# 特定操纵指示符 (2位)
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bits.append(format(special_maneuver, '02b'))
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# 备用 (3位)
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bits.append(format(spare, '03b'))
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# RAIM标志 (1位)
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bits.append(str(raim_flag))
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# 通信状态 (19位)
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bits.append(format(comm_state, '019b'))
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# 合并所有位
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bit_string = ''.join(bits)
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# 验证总位数
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total_bits = len(bit_string)
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if total_bits != 168:
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print(f"警告: 总位数应为168，实际为{total_bits}")
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# 将位字符串转换为字节
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binary_int = int(bit_string, 2) # 将二进制字符串转换为整数
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byte_length = (len(bit_string) + 7) // 8 # 计算需要的字节数
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binary_data = binary_int.to_bytes(byte_length, 'big') # 转换为字节
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return binary_data
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def print_binary(data):
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"""打印二进制数据"""
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print("十六进制表示:", data.hex())
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print("二进制表示:", ' '.join(format(byte, '08b') for byte in data))
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def send_data_continuously():
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"""启动Socket服务端"""
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host = '127.0.0.1' # 监听所有网络接口
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port = 10
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with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
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s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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s.bind((host, port))
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s.listen(1)
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print(f"Socket服务端已启动，监听 {host}:{port}")
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while True:
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try:
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conn, addr = s.accept()
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print(f"客户端连接来自: {addr}")
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while True:
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# 接收客户端数据
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data = conn.recv(4096) # 接收客户端数据
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if data:
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print(f"收到VDES客户端消息: {data.hex()}")
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# 向客户端发送数据
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try:
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# 生成并发送AIS报文
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selected_ship = random.choice(SHIP_LIST)
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mmsi = selected_ship[0]
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lon, lat = generate_ship_position(mmsi)
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heading = SHIP_STATUS[mmsi]['heading']
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demod_content = encode_demod_fields(mmsi, lat, lon, heading)
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ais_data = create_ais_info_packet(demod_content)
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ais_packet = create_tcp_packet(12, ais_data)
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conn.sendall(ais_packet)
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# 生成并发送GPS报文
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gps_content = create_gps_packet()
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gps_packet = create_tcp_packet(7, gps_content)
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conn.sendall(gps_packet)
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time.sleep(0.5)
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except (ConnectionResetError, BrokenPipeError):
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print("客户端断开连接")
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break
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except KeyboardInterrupt:
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print("\n服务端已停止")
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break
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except Exception as e:
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print(f"服务端错误: {e}")
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if __name__ == "__main__":
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send_data_continuously() |