350 lines
13 KiB
Python
350 lines
13 KiB
Python
import struct
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import math
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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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utc_time = 1680000000 # UTC时间 (8字节)
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longitude = 1205000000 # 经度 (4字节，东经120.5度)
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latitude = 305000000 # 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 = 123456789 # 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 = 120.5 # 经度 (28 bits) - 东经120.5°
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latitude = 30.5 # 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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# 生成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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# print("完整报文字节长度:", len(final_packet))
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# print("二进制表示:")
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# print(final_packet)
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# print(' '.join(f'{b:02x}' for b in final_packet))
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# print('----------------------------------/n')
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# 生成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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# 打印二进制报文
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# print("完整报文字节长度:", len(gps_packet))
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# print("二进制表示:")
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# print(gps_packet)
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# print(' '.join(f'{b:02x}' for b in gps_packet))
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def get_tcp_data(packet_data):
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#判断帧头是否符合卓研
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if packet_data[:4].decode('ascii') == '####':
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print("开始解析报文帧")
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packet_type = struct.unpack('>I', packet_data[4:8])[0] #获取报文类型 7为gps， 12为ais
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packet_lenth = struct.unpack('>I', packet_data[8:12])[0]
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packet_content = packet_data[12:]
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if packet_type == 7:
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print(f"GPS内容长度: {packet_lenth} 字节")
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data = get_gps_data(packet_content)
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print(data)
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elif packet_type == 12:
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print(f"AIS内容长度: {packet_lenth} 字节")
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data = get_ais_data(packet_content)
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print(data)
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def get_gps_data(packet_content):
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fields = struct.unpack('>QiiiHHHBBIII', packet_content)
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res = {}
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res['utc_time'] = fields[0] # UTC时间 (8字节)
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res['longitude'] = fields[1]/10000000 # 经度 (4字节，东经120.5度)
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res['latitude'] = fields[2]/10000000 # 纬度 (4字节，北纬30.5度)
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res['altitude'] = fields[3] # 海拔高度 (4字节，50米)
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res['used_sats'] = fields[4] # 定位使用的卫星数 (2字节)
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res['gps_sats'] = fields[5] # GPS卫星数 (2字节)
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res['beidou_sats'] = fields[6] # 北斗卫星数 (2字节)
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res['gps_status'] = fields[7] # GPS状态 (1字节，单点定位)
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res['position_mode'] = fields[8] # 定位模式 (1字节，3D定位)
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res['hdop'] = fields[9]/10 # 水平精度因子 (4字节，25.5米)
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res['speed'] = fields[10]/100 # 运动速度 (4字节，10.24节)
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res['direction'] = fields[11] # 运动方向 (4字节，359度)
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return res
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def get_ais_data(packet_content):
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res ={}
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demod_packet = packet_content[:9]
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demod_data = packet_content[9:]
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fields = struct.unpack('>BBBHHH', demod_packet)
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res['message_type'] = fields[0]
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res['satellite_id'] = fields[1]
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res['demodulator_id'] = fields[2]
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res['demod_slot'] = fields[3]
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res['receive_delay'] = fields[4]
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snr_packed = fields[5]
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# 解析SNR
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snr_int = (snr_packed >> 8) & 0xFF
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snr_frac = snr_packed & 0xFF
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res['snr'] = snr_int + snr_frac / 100.0
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print(demod_data)
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res['demod_data'] = get_demod_data(demod_data)
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return res
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def get_demod_data(bit_string):
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# 如果输入是字节类型，先转换为二进制字符串
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if isinstance(bit_string, bytes):
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bit_string = ''.join(format(byte, '08b') for byte in bit_string)
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pos = 0
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decoded = {}
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decoded['message_id'] = int(bit_string[pos:pos+6], 2) # 消息ID (6 bits)
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pos += 6
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decoded['repeat_indicator'] = int(bit_string[pos:pos+2], 2) # 转发指示符 (2 bits)
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pos += 2
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decoded['user_id'] = int(bit_string[pos:pos+30], 2) # 用户ID/MMSI (30 bits)
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pos += 30
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decoded['navigation_status'] = int(bit_string[pos:pos+4], 2) # 导航状态 (4 bits)
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pos += 4
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# 旋转速率 (8位有符号整数)
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rot_value = int(bit_string[pos:pos+8], 2)
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if rot_value > 127:
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rot_value -= 256
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decoded['rot'] = rot_value
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pos += 8
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decoded['sog'] = int(bit_string[pos:pos+10], 2) # 地面航速 (10 bits)
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pos += 10
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decoded['position_accuracy'] = int(bit_string[pos], 2) # 位置准确度 (1 bit)
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pos += 1
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# 经度 (28位)
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longitude_value = int(bit_string[pos:pos+28], 2)
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decoded['longitude'] = longitude_value / (60 * 10000) # 转换为度
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pos += 28
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# 纬度 (27位)
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latitude_value = int(bit_string[pos:pos+27], 2)
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decoded['latitude'] = latitude_value / (60 * 10000) # 转换为度
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pos += 27
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decoded['cog'] = int(bit_string[pos:pos+12], 2) # 地面航线 (12 bits)
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pos += 12
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decoded['true_heading'] = int(bit_string[pos:pos+9], 2) # 实际航向 (9 bits)
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pos += 9
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decoded['timestamp'] = int(bit_string[pos:pos+6], 2) # 时戳 (6 bits)
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pos += 6
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decoded['special_maneuver'] = int(bit_string[pos:pos+2], 2) # 特定操纵指示符 (2 bits)
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pos += 2
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decoded['spare'] = int(bit_string[pos:pos+3], 2) # 备用 (3 bits)
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pos += 3
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decoded['raim_flag'] = int(bit_string[pos], 2) # RAIM标志 (1 bit)
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pos += 1
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decoded['comm_state'] = int(bit_string[pos:pos+19], 2) # 通信状态 (19 bits)
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return decoded
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get_tcp_data(ais_packet)
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# def get_demod_data(bit_string):
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# pos = 0
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# message_id = int(bit_string[pos:pos+6], 2) # 消息ID (6 bits)
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# pos += 6
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# repeat_indicator = int(bit_string[pos:pos+2], 2) # 转发指示符 (2 bits)
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# pos += 2
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# user_id = int(bit_string[pos:pos+30], 2) # 用户ID/MMSI (30 bits)
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# pos += 30
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# navigation_status = int(bit_string[pos:pos+4], 2) # 导航状态 (4 bits) - 航行中
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# pos += 4
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# rot_value = int(bit_string[pos:pos+8], 2)
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# # 转换为有符号整数
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# if rot_value > 127:
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# rot_value -= 256
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# rot = rot_value # 旋转速率 (8 bits) - 无信息
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# pos += 8
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# sog = int(bit_string[pos:pos+10], 2) # 地面航速 (10 bits) - 10.2节
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# pos += 10
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# position_accuracy = int(bit_string[pos], 2) # 位置准确度 (1 bit) - 高
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# pos += 1
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# longitude_value = int(bit_string[pos:pos+28], 2)
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# # 转换为度
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# longitude_deg = longitude_value / (60 * 10000)
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# longitude = longitude_deg # 经度 (28 bits) - 东经120.5°
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# pos += 28
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# latitude_value = int(bit_string[pos:pos+27], 2)
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# # 转换为度
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# latitude_deg = latitude_value / (60 * 10000)
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# latitude = latitude_deg # 纬度 (27 bits) - 北纬30.5°
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# pos += 27
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# cog = int(bit_string[pos:pos+12], 2) # 地面航线 (12 bits) - 90.0°
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# pos += 12
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# true_heading = int(bit_string[pos:pos+9], 2) # 实际航向 (9 bits) - 90°
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# pos += 9
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# timestamp = int(bit_string[pos:pos+6], 2) # 时戳 (6 bits) - UTC秒
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# pos += 6
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# special_maneuver = int(bit_string[pos:pos+2], 2) # 特定操纵指示符 (2 bits)
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# pos += 2
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# spare = int(bit_string[pos:pos+3], 2) # 备用 (3 bits)
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# pos += 3
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# raim_flag = int(bit_string[pos], 2) # RAIM标志 (1 bit)
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# pos += 1
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# comm_state = int(bit_string[pos:pos+19], 2) # 通信状态 (19 bits)
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