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| """
舱内雷达生命体征监测
提取呼吸和心跳频率
"""
import numpy as np
from scipy import signal
class RadarVitalSignsMonitor:
"""
雷达生命体征监测器
"""
def __init__(self):
self.center_freq = 60e9
self.sample_rate = 1000
self.breathing_band = (0.2, 0.5)
self.heart_rate_band = (1.0, 2.3)
def process_radar_signal(
self,
radar_data: np.ndarray
) -> dict:
"""
处理雷达信号，提取生命体征
Args:
radar_data: (N,) 雷达相位信号
Returns:
{
'breathing_rate': float, # 次/分钟
'heart_rate': float, # 次/分钟
'presence_detected': bool
}
"""
phase = np.angle(radar_data)
phase_unwrapped = np.unwrap(phase)
phase_detrended = signal.detrend(phase_unwrapped)
sos_breathing = signal.butter(
4, self.breathing_band, btype='band', fs=self.sample_rate, output='sos'
)
breathing_signal = signal.sosfilt(sos_breathing, phase_detrended)
sos_heart = signal.butter(
4, self.heart_rate_band, btype='band', fs=self.sample_rate, output='sos'
)
heart_signal = signal.sosfilt(sos_heart, phase_detrended)
breathing_rate = self._find_dominant_freq(
breathing_signal, self.sample_rate, self.breathing_band
)
heart_rate = self._find_dominant_freq(
heart_signal, self.sample_rate, self.heart_rate_band
)
signal_energy = np.var(phase_detrended)
presence_detected = signal_energy > 0.01
return {
'breathing_rate': breathing_rate * 60,
'heart_rate': heart_rate * 60,
'presence_detected': presence_detected
}
def _find_dominant_freq(
self,
signal_data: np.ndarray,
fs: float,
freq_band: tuple
) -> float:
"""找到主频率"""
n = len(signal_data)
freqs = np.fft.fftfreq(n, 1/fs)
fft_result = np.abs(np.fft.fft(signal_data))
pos_mask = freqs > 0
freqs = freqs[pos_mask]
fft_result = fft_result[pos_mask]
band_mask = (freqs >= freq_band[0]) & (freqs <= freq_band[1])
if np.any(band_mask):
dominant_freq = freqs[band_mask][np.argmax(fft_result[band_mask])]
else:
dominant_freq = 0
return dominant_freq
class MultiTargetRadarCPD:
"""
多目标雷达 CPD 系统
检测车内多个生命体
"""
def __init__(self):
self.vital_monitor = RadarVitalSignsMonitor()
self.num_tx = 2
self.num_rx = 4
self.angle_resolution = 15
def scan_cabin(self, radar_frame: np.ndarray) -> list:
"""
扫描舱内，检测所有生命体
Args:
radar_frame: (num_rx, num_samples) 雷达数据帧
Returns:
[
{
'position': (range, angle),
'breathing_rate': float,
'heart_rate': float,
'type': 'adult' | 'child' | 'pet'
},
...
]
"""
range_angle_map = self._form_range_angle_map(radar_frame)
targets = self._detect_targets(range_angle_map)
results = []
for target in targets:
vital_signs = self.vital_monitor.process_radar_signal(
target['signal']
)
if vital_signs['heart_rate'] > 120:
target_type = 'child'
elif vital_signs['heart_rate'] > 100:
target_type = 'pet'
else:
target_type = 'adult'
results.append({
'position': target['position'],
'breathing_rate': vital_signs['breathing_rate'],
'heart_rate': vital_signs['heart_rate'],
'type': target_type
})
return results
def _form_range_angle_map(self, radar_frame):
"""形成距离-角度图"""
pass
def _detect_targets(self, range_angle_map):
"""检测目标"""
pass
|