{
  "id": "agriculture_planting_001",
  "industry": "农业",
  "domain": "种植业",
  "task_type": "农机协作失败诊断",
  "label": "GPS信号干扰导致导航失效",
  "input": "联合收割机在田间运行时，突然出现导航漂移，无法保持直线行进，作业轨迹紊乱。",
  "cot_steps": [
    "导航系统依赖GPS/RTK定位实现高精度路径控制。",
    "轨迹漂移说明定位模块数据异常。",
    "检查发现田间附近设有高压变电站，可能产生强电磁干扰。",
    "RTK基站数据丢失或延迟，系统自动切换至低精度GPS。",
    "导航误差累计，导致直线控制失效。"
  ],
  "answer": "为GPS/RTK信号受干扰引发导航控制偏移，应加设信号屏蔽和辅助路径识别。",
  "key_variables": [
    "GPS信号",
    "RTK状态",
    "电磁干扰",
    "导航漂移"
  ],
  "difficulty": "中等",
  "source": "农机导航系统运维记录"
}