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报文模拟解析/地检设备模拟/bk_local_inspection.py Normal file
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import struct
import socket
import time
import random
from random import uniform, randint
import math
import threading
from vdes_message_unpack import VdesMessageUnpack
SHIP_MMSIS = [random.randint(336295939, 336295969) for _ in range(10)]
SHIP_STATUS = {}
# 生成包含30艘船信息的列表（MMSI、纬度、经度、航向）
SHIP_LIST = [
(
336295939 + i, # MMSI号
round(random.uniform(30.0, 34.0), 6),
round(random.uniform(123.5, 126.0), 6),
random.randint(0, 359)
) for i in range(30)
]
# 初始化船只状态
for ship in SHIP_LIST:
mmsi, init_lat, init_lon, heading = ship
SHIP_STATUS[mmsi] = {
'current_lat': init_lat,
'current_lon': init_lon,
'heading': heading,
'speed': 280.24 #加速100倍用于演示
}
YANGTZE_ESTUARY_LAT = 31.23
YANGTZE_ESTUARY_LON = 123.87
RANGE_NM = 5 # 5海里范围
current_lat = YANGTZE_ESTUARY_LAT # 当前纬度
current_lon = YANGTZE_ESTUARY_LON # 当前经度
own_heading = 90 # 固定航向 (50度)
def generate_random_position():
"""生成船只位置(基于当前位置和航向计算)"""
global current_lat, current_lon, own_heading
# 速度为10.24节(来自GPS报文设置)
speed_knots = 300.24 #加速100倍用于演示
# 转换为公里/小时 (1节 = 1.852公里/小时)
speed_kmh = speed_knots * 1.852
# 转换为公里/秒 (发送间隔为1秒)
speed_kmps = speed_kmh / 3600
# 计算1秒内移动的距离(公里)
distance_km = speed_kmps * 1
# 将航向转换为弧度
heading_rad = math.radians(own_heading)
# 计算纬度和经度变化
# 1度纬度 ≈ 111公里
delta_lat = distance_km / 111.0 * math.cos(heading_rad)
# 1度经度 ≈ 111公里 * cos(纬度)
delta_lon = distance_km / (111.0 * math.cos(math.radians(current_lat))) * math.sin(heading_rad)
# 更新当前位置
current_lat += delta_lat
current_lon += delta_lon
# 转换为度分格式*10^7
longitude = int(current_lon * 10000000)
latitude = int(current_lat * 10000000)
return longitude, latitude
def generate_ship_position(mmsi):
"""根据船只MMSI生成当前位置"""
global SHIP_STATUS
ship = SHIP_STATUS[mmsi] #获取全局船只中的一个进行修改
speed_knots = ship['speed']
speed_kmh = speed_knots * 1.852
speed_kmps = speed_kmh / 3600
distance_km = speed_kmps * 1
# 航向转弧度
heading_rad = math.radians(ship['heading'])
# 计算经纬度变化
delta_lat = distance_km / 111.0 * math.cos(heading_rad)
delta_lon = distance_km / (111.0 * math.cos(math.radians(ship['current_lat']))) * math.sin(heading_rad)
# 更新船只状态
ship['current_lat'] += delta_lat
ship['current_lon'] += delta_lon
# 返回新位置
return ship['current_lon'], ship['current_lat']
def create_tcp_packet(packet_type, content):
"""创建符合VDES TCP协议的报文"""
# 报文帧头 (4字节)
header = b'####'
# 报文类型 (4字节，大端)
type_field = struct.pack('>I', packet_type)
# 报文长度 (4字节，大端，内容长度)
length = len(content)
length_field = struct.pack('>I', length)
# 构建完整报文
packet = header + type_field + length_field + content
return packet
def create_gps_packet():
"""创建GPS解析数据报文(类型7)的内容"""
# 模拟GPS数据 (表11定义)
lon, lat = generate_random_position()
utc_time = 1680000000 # UTC时间 (8字节)
longitude = lon # 经度 (4字节，东经120.5度)
latitude = lat # 纬度 (4字节，北纬30.5度)
altitude = 50 # 海拔高度 (4字节，50米)
used_sats = 10 # 定位使用的卫星数 (2字节)
gps_sats = 8 # GPS卫星数 (2字节)
beidou_sats = 7 # 北斗卫星数 (2字节)
gps_status = 1 # GPS状态 (1字节，单点定位)
position_mode = 3 # 定位模式 (1字节，3D定位)
hdop = 2550 # 水平精度因子 (4字节，25.5米)
speed = 1024 # 运动速度 (4字节，10.24节)
direction = own_heading # 运动方向 (4字节，359度)
# 打包为二进制 (大端字节序)
content = struct.pack(
'>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)
utc_time,
longitude,
latitude,
altitude,
used_sats,
gps_sats,
beidou_sats,
gps_status,
position_mode,
hdop,
speed,
direction
)
return content
def create_ais_vdes_info_packet(demod_content, Demodulator_id):
"""创建解调信息报文(类型12)的内容"""
# 模拟解调信息数据
message_type = 12 # 消息类型 (1字节)
satellite_id = 1 # 卫星ID (1字节)
demodulator_id = Demodulator_id # 解调器编号 (1字节)
demod_slot = 1234 # 解调时隙 (2字节)
receive_delay = 5678 # 接收延迟 (2字节，单位us)
snr = 25.75 # 信噪比 (2字节，dB)
# 处理信噪比 (高8位整数部分，低8位小数部分)
snr_int = int(snr)
snr_frac = int((snr - snr_int) * 100) # 转换为0-99的小数部分
snr_packed = (snr_int & 0xFF) << 8 | (snr_frac & 0xFF)
# 打包为二进制 (大端字节序)
content = struct.pack(
'>BBBHHH', # 格式: B(1),B(1),B(1),H(2),H(2),h(2)
message_type,
satellite_id,
demodulator_id,
demod_slot,
receive_delay,
snr_packed
)
return content + demod_content
def encode_ais_demod_fields(SHIP_MMSI, lat, lon, heading):
"""编码AIS解调信息字段"""
# 初始化二进制位列表
bits = []
# 示例数据
message_id = 1 # 消息ID (6 bits)
repeat_indicator = 0 # 转发指示符 (2 bits)
user_id = SHIP_MMSI # 用户ID/MMSI (30 bits)
navigation_status = 8 # 导航状态 (4 bits) - 航行中
rot = -128 # 旋转速率 (8 bits) - 无信息
sog = 102 # 地面航速 (10 bits) - 10.2节
position_accuracy = 1 # 位置准确度 (1 bit) - 高
longitude, latitude = lon, lat # 经纬度
cog = heading # 地面航线 (12 bits) - 90.0°
true_heading = heading # 实际航向 (9 bits) - 90°
timestamp = 30 # 时戳 (6 bits) - UTC秒
special_maneuver = 0 # 特定操纵指示符 (2 bits)
spare = 0 # 备用 (3 bits)
raim_flag = 0 # RAIM标志 (1 bit)
comm_state = 0 # 通信状态 (19 bits)
# 添加各个字段（按照协议顺序）
bits.append(format(message_id, '06b')) # 消息ID
bits.append(format(repeat_indicator, '02b')) # 转发指示符
bits.append(format(user_id, '030b')) # 用户ID
bits.append(format(navigation_status, '04b')) # 导航状态
# 旋转速率 (8位有符号整数)
rot_bits = rot & 0xFF
bits.append(format(rot_bits, '08b'))
# 地面航速 (10位)
bits.append(format(min(sog, 1023), '010b'))
# 位置准确度 (1位)
bits.append(str(position_accuracy))
# 经度 (28位)
# 转换为1/10,000分钟单位
longitude_min = int(longitude * 60 * 10000)
bits.append(format(longitude_min & 0x0FFFFFFF, '028b'))
# 纬度 (27位)
latitude_min = int(latitude * 60 * 10000)
bits.append(format(latitude_min & 0x07FFFFFF, '027b'))
# 地面航线 (12位)
bits.append(format(min(cog, 3600), '012b'))
# 实际航向 (9位)
bits.append(format(min(true_heading, 511), '09b'))
# 时戳 (6位)
bits.append(format(min(timestamp, 63), '06b'))
# 特定操纵指示符 (2位)
bits.append(format(special_maneuver, '02b'))
# 备用 (3位)
bits.append(format(spare, '03b'))
# RAIM标志 (1位)
bits.append(str(raim_flag))
# 通信状态 (19位)
bits.append(format(comm_state, '019b'))
# 合并所有位
bit_string = ''.join(bits)
# 验证总位数
total_bits = len(bit_string)
if total_bits != 168:
print(f"警告: 总位数应为168，实际为{total_bits}")
# 将位字符串转换为字节
binary_int = int(bit_string, 2) # 将二进制字符串转换为整数
byte_length = (len(bit_string) + 7) // 8 # 计算需要的字节数
binary_data = binary_int.to_bytes(byte_length, 'big') # 转换为字节
return binary_data
def encode_vdes_demod_fields(Type, Fragment_num, MMSI, Payload):
"""编码VDES解调信息字段"""
source_id = 12345678 # 信源电台ID
satellite_id = 1 # 卫星ID
session_id = 100 # 会话ID
dest_id = MMSI # 目的地电台ID
fragment_num = Fragment_num # 片段编号
binary_payload = Payload # 载荷内容
# 计算载荷大小 (字段3到8的大小)
payload_size = 4 + 1 + 1 + 4 + 2 + len(binary_payload)
# 打包为二进制 (大端字节序)
content = struct.pack(
'>B H I B B I H', # 格式: B(1),H(2),I(4),B(1),B(1),I(4),H(2)
Type, # 类型 (1字节)
payload_size, # 载荷大小 (2字节)
source_id, # 信源电台ID (4字节)
satellite_id, # 卫星ID (1字节)
session_id, # 会话ID (1字节)
dest_id, # 目的地电台ID (4字节)
fragment_num # 片段编号 (2字节)
)
return content + binary_payload # 添加载荷内容
def print_binary(data):
"""打印二进制数据"""
print("十六进制表示:", data.hex())
print("二进制表示:", ' '.join(format(byte, '08b') for byte in data))
def send_data_continuously():
"""启动Socket服务端"""
host = '127.0.0.1' # 监听所有网络接口
port = 10
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind((host, port))
s.listen(1)
print(f"Socket服务端已启动，监听 {host}:{port}")
while True:
try:
conn, addr = s.accept()
print(f"客户端连接来自: {addr}")
unpacker = VdesMessageUnpack()
mmsi: int
fragment_num = 0
while True:
# 接收客户端数据
data = conn.recv(65536) # 接收客户端数据
if data:
print(f"收到VDES客户端消息: {data.hex()}")
try:
frame_type, message = unpacker.unpack_tcp_packet(data)
mmsi = unpacker.get_mmsi()
if frame_type == 0: # 起始片段
Type = 30
fragment_num += 1
elif frame_type == 1: # 延续片段
Type = 31
fragment_num += 1
elif frame_type == 2: # 结束片段
Type = 32
fragment_num += 1
vdes_demod_content = encode_vdes_demod_fields(Type, fragment_num, mmsi, message)
vdes_data = create_ais_vdes_info_packet(vdes_demod_content, 0) #0-3代表vdes解调器
vdes_packet = create_tcp_packet(12, vdes_data)
conn.sendall(vdes_packet)
time.sleep(0.5)
if not unpacker.get_unpack_statu():
fragment_num = 0 # 重置片段编号
print("解析消息完成")
except ValueError as e:
print(f"报文解析错误: {e}")
# 向客户端发送数据
# try:
# # 生成并发送AIS报文
# selected_ship = random.choice(SHIP_LIST)
# mmsi = selected_ship[0]
# lon, lat = generate_ship_position(mmsi)
# heading = SHIP_STATUS[mmsi]['heading']
# ais_demod_content = encode_ais_demod_fields(mmsi, lat, lon, heading)
# ais_data = create_ais_vdes_info_packet(ais_demod_content, 4) #4-5代表ais解调器
# ais_packet = create_tcp_packet(12, ais_data)
# conn.sendall(ais_packet)
# # 生成并发送GPS报文
# gps_content = create_gps_packet()
# gps_packet = create_tcp_packet(7, gps_content)
# print(f"发送GPS报文: {gps_packet.hex()}")
# conn.sendall(gps_packet)
# time.sleep(0.5)
# except (ConnectionResetError, BrokenPipeError):
# print("客户端断开连接")
# break
except KeyboardInterrupt:
print("\n服务端已停止")
break
except Exception as e:
print(f"服务端错误: {e}")
if __name__ == "__main__":
send_data_continuously()