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The respiratory and heartbeat monitoring radar IR77BHM1 works in the 77GHz millimeter wave band, which is a radar detection module to realize the real-time perception and measurement of human respiratory frequency and heart rate. This module detects the radar echo reflected by human body surface through FMCW radar system, and realizes the detection of human ECG by calculating the change of target distance information and body surface micro motion information in unit time.
Relevant manual about this product on Library
● Radar detection based on FMCW signal
1) 77GHz Radar Module for Resipiration and Heartbeat Monitoring, IR77BHM1*1pc
When the radar works, the working surface of the radar shall be facing the chest or back of the tested person as far as possible, and the distance from the human body to the radar surface shall be ≤ 2m.
1. Start Time
When the module starts to work when it is initially powered on, it is necessary to completely reset the internal circuit of the module and fully evaluate the environmental noise to ensure the normal operation of the module. Therefore, when the module is initially powered on, it needs a startup stability time of ≥30s to ensure the validity of subsequent output parameters.
2. Limitations on Heartbeat Monitoring
Since this module is a respiratory and heartbeat detection radar, the detection distance should not be too far, and the appropriate distance is 0.1m-2m.
When there are objects with stronger reflectivity than the measured target around the measured target, the radar may track the strongly reflected target during operation. At this time, the radar detection parameters are abnormal and the radar position needs to be adjusted.
At present, the radar module can only measure a single target, and multi-target measurement is temporarily unavailable. Therefore, when multiple people are located in the radar detection area, the detection parameters are disordered, which needs attention.
3. Radar biological detection performance
Because human biological characteristics belong to ultra-low frequency and weak reflection characteristic signals, radar processing requires a relatively long cumulative processing. During the cumulative process, many factors may affect the radar parameters, so occasional detection failure is normal.
4. Power
The radar module requires higher power quality than conventional low frequency circuits. When powering the module, it is required that the power supply has no threshold glitches or ripples and that it effectively shields the power supply noise caused by accessory equipment.
The radar module needs to be well grounded. Due to the ground noise brought by other circuits, the performance of the radar module may even be reduced or even work abnormally; the most common cause is a shorter detection distance or an increased false alarm rate.
In order to ensure the normal operation of the VCO circuit inside the module, the power supply requirement for this module is + 5V- + 9V power supply, voltage of power supply no less than 5V. The external power supply must provide sufficient current output capability and transient response capability.
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