53 lines
1.6 KiB
Python
53 lines
1.6 KiB
Python
import struct
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def create_demod_info_packet():
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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
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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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# 使用示例
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demod_info_content = create_demod_info_packet()
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demod_info_packet = create_tcp_packet(12, demod_info_content)
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# 打印结果
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