230 lines
8.2 KiB
Python
230 lines
8.2 KiB
Python
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import struct
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import socket
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import time
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import random
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SHIP_MMSIS = [random.randint(200000000, 299999999) for _ in range(10)]
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YANGTZE_ESTUARY_LAT = 31.23
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YANGTZE_ESTUARY_LON = 122.47
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RANGE_NM = 5 # 5海里范围
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def generate_random_position():
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"""生成随机船只位置(基于长江口基准坐标)"""
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# 1海里=1.852公里≈0.0166667度(纬度)
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lat = YANGTZE_ESTUARY_LAT + (random.random() - 0.5) * RANGE_NM * 0.0166667
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lon = YANGTZE_ESTUARY_LON + (random.random() - 0.5) * RANGE_NM * 0.0166667
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# 转换为度分格式*10000000
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longitude = int(lon * 10000000) # 东经为正数
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latitude = int(lat * 10000000) # 北纬为正数
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return longitude, latitude
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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 = 359 # 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():
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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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# 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 = random.choice(SHIP_MMSIS) # 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 = 124.5 + (random.random() - 0.5) * RANGE_NM * 0.0166667 # 经度 (28 bits) - 东经120.5°
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latitude = 30.5 + (random.random() - 0.5) * RANGE_NM * 0.0166667 # 纬度 (27 bits) - 北纬30.5°
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cog = 900 # 地面航线 (12 bits) - 90.0°
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true_heading = 90 # 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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"""持续发送AIS和GPS数据到指定端口"""
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host = 'localhost'
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port = 8082
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# 无连接型
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with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as s:
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print(f"模拟发送数据到 {host}:{port} (UDP)")
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while True:
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try:
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# 生成并发送AIS报文
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demod_content = encode_demod_fields()
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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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s.sendto(ais_packet, (host, port))
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print("AIS报文:")
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print_binary(ais_packet)
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print("已发送AIS报文")
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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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s.sendto(gps_packet, (host, port))
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print("\nGPS报文:")
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print_binary(gps_packet)
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print("已发送GPS报文")
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# 等待1秒
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time.sleep(3)
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except KeyboardInterrupt:
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print("\n停止发送数据")
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break
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except Exception as e:
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print(f"发送数据时出错: {e}")
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break
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if __name__ == "__main__":
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send_data_continuously()
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