Vital sign signal enhancement method and device, extraction method and device based on millimeter wave radar
A technology of millimeter-wave radar and vital signs, which is applied in the field of signal processing, can solve problems such as reducing the signal-to-noise ratio of radar receiving echoes and affecting detection accuracy, and achieve the effect of enhancing vital signs signals
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Embodiment 1
[0105] In this embodiment, a radar with 4 antennas is used to receive the echoes of the radar transmission signals from the target, and a 4-channel Kalman smoothing model is constructed to enhance the echo signals. The specific steps are:
[0106] A. Set the simulation target, its breathing frequency f r 0.27Hz, heartbeat frequency f h 1.16Hz, use 4-antenna radar to detect the target, get 4-channel echo, the signal-to-noise ratio of the four channels is set to -5dB, 0dB, 5dB and 10dB respectively.
[0107] Such as image 3 Shown is the waveform diagram of the echo signal received by the second antenna, which contains a large number of interference signals.
[0108] B. Perform zero-notch filtering on the 4-channel signals. In this embodiment, the pole distance parameter μ is 0.01.
[0109] C, build the 4-channel Kalman smoothing model, its processing data block size N=100, promptly the 100 echo signals that radar is received continuously are enhanced, wherein the nth echo s...
Embodiment 2
[0121] In this embodiment, on the basis of Embodiment 1, jitter is added to the simulated target to simulate the jitter state of the human body. The jitter signal is a triangle wave, and the expression is as follows:
[0122]
[0123] Wherein m represents the number of time units with body shaking, the ratio r=20% of the total duration and the duration of the simulated signal, T 1 ,...,T m are the duration of each unit, which are set to 4 in this example; A 1 ,...,A m They are the maximum jitter amplitude of each unit, which is set to a random value in this example, the amplitude is between [0, 10]mm, and the signal-to-noise ratio of each channel is 5dB, 10dB, 15dB, and 20dB.
[0124] Figure 7 It is the waveform diagram of the echo signal received by the second antenna.
[0125] After performing zero-notch filtering on the echo signal, two 4-channel Kalman smoothing models were constructed to extract the respiratory frequency and heartbeat frequency respectively. Two ...
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