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| """
NXP NCJ29D6 双模式: 数字钥匙 + CPD
时间分割方案:
- 车辆行驶中: 数字钥匙待机 + CPD雷达模式
- 车辆停泊后: 纯CPD雷达检测
- 接近车辆时: 数字钥匙测距激活
"""
class NCJ29D6Controller:
"""
NCJ29D6 UWB 控制器模拟
管理数字钥匙和CPD两种模式的时间调度
"""
CHANNEL_CONFIG = {
'channel_5': {'band': '6.5 GHz', 'bandwidth': '500 MHz', 'use': 'digital_key'},
'channel_6': {'band': '6.5 GHz', 'bandwidth': '500 MHz', 'use': 'digital_key'},
'channel_8': {'band': '7.5 GHz', 'bandwidth': '500 MHz', 'use': 'cpd_radar'},
'channel_9': {'band': '8.0 GHz', 'bandwidth': '500 MHz', 'use': 'cpd_radar'},
}
MODES = {
'PARKED_CPD': {
'description': '车辆停泊后的CPD检测模式',
'cycle_ms': 1000,
'pulse_duration': '2ms',
'sleep_duration': '998ms',
'detection_range': '1.5m',
'power_consumption': '< 10mW',
},
'DRIVING_KEY': {
'description': '行驶中数字钥匙待机',
'cycle_ms': 100,
'listening_duration': '5ms',
'sleep_duration': '95ms',
'detection_range': '3m',
'power_consumption': '< 50mW',
},
'APPROACH_KEY': {
'description': '检测到手机接近时的主动测距',
'cycle_ms': 20,
'ranging_duration': '10ms',
'sleep_duration': '10ms',
'detection_range': '3m',
'power_consumption': '< 200mW',
},
'CPD_ALERT': {
'description': 'CPD检测到存在后的持续监控',
'cycle_ms': 200,
'pulse_duration': '4ms',
'sleep_duration': '196ms',
'detection_range': '1.5m',
'power_consumption': '< 30mW',
}
}
def __init__(self):
self.current_mode = 'PARKED_CPD'
self.cpd_detected = False
self.phone_detected = False
def run_cycle(self, vehicle_state: str, phone_rssi: float):
"""
运行一个工作周期
Args:
vehicle_state: 'driving' | 'parked' | 'approaching'
phone_rssi: 手机UWB信号强度(dBm), None表示无信号
"""
if vehicle_state == 'driving':
self.current_mode = 'DRIVING_KEY'
elif vehicle_state == 'parked':
if phone_rssi is not None and phone_rssi > -70:
self.current_mode = 'APPROACH_KEY'
else:
if self.cpd_detected:
self.current_mode = 'CPD_ALERT'
else:
self.current_mode = 'PARKED_CPD'
self.cpd_detected = self._perform_cpd_scan()
elif vehicle_state == 'approaching':
self.current_mode = 'APPROACH_KEY'
return self.MODES[self.current_mode]
def _perform_cpd_scan(self) -> bool:
"""
执行CPD雷达扫描
UWB雷达检测原理:
1. 发射超宽带脉冲
2. 接收反射信号
3. 多普勒分析检测微动（呼吸/心跳）
4. 与静态背景对比
"""
import random
return random.random() > 0.95
def get_alert_level(self) -> dict:
"""获取警报等级"""
if not self.cpd_detected:
return {'level': 'none', 'action': 'none'}
return {
'level': 'warning',
'action': 'send_notification',
'message': '检测到车内有生命体征，请检查后座',
'channels': ['app_push', 'horn', 'hazard_lights'],
'escalation_delay': '30s后升级为报警'
}
if __name__ == "__main__":
controller = NCJ29D6Controller()
scenarios = [
('driving', None, '正常行驶'),
('parked', -45, '停泊，手机在附近'),
('parked', None, '停泊，无手机信号'),
('approaching', -55, '用户走向车辆'),
]
for state, rssi, desc in scenarios:
mode = controller.run_cycle(state, rssi)
print(f"\n场景: {desc}")
print(f" 模式: {controller.current_mode}")
print(f" 功耗: {mode['power_consumption']}")
print(f" 周期: {mode['cycle_ms']}ms")
print(f" 范围: {mode['detection_range']}")
if controller.cpd_detected:
alert = controller.get_alert_level()
print(f" ⚠️ CPD警报: {alert['message']}")
|