77GHz Radar Module for Resipiration and Heartbeat Monitoring, IR77BHM1

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Product serial number

7777783

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IoT

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INTRODUCTION

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 rhythm. 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.

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FEATURE

● Radar detection based on FMCW signal

● Respiration and heartbeat detection range 0.1-2m

● MIMO antenna with 2 transmitters and 4 receivers

● Output power is low, whitch is harmless to human body

● Synchronous perception of human respiratory rate and heart rhythm

● This module can observe the distance information from human body to radar

● This module can detect human respiratory rate(PR) and heart rhythm(RESP) in real time

● Not affected by environmental factors like temperature, humidity, noise, airflow, dust, light and etc

OPERATING MODE

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.

PRECAUTIONS

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.

PARAMETERS

Parameters	Min	Typ	Max
Operating Performance
Detection Distance(Chest)	0.1m		2m
Detection Distance(Back)	0.05m		0.5m
Measurement Accuracy of Respiration		90%
Measurement Accuracy of Heartbeat		90%
Refresh Time	1s		60s
Observation Construction Time		20s
Operating Parameters
Operating Voltage (VCC)	4.6V	5V	6V
Operating Current (ICC)		250mA	300mA
Operating Temperature (T_OP)	-20℃		60℃
Storage Temperature (T_st)	-40℃		80℃
Parameters of Transmission
Operating Frequency (fTX)		77	78
Transmitting Power (Pout)	8	10	12
Parameters of Antenna
Antenna Gain (GANT)		12
Horizontal Beam (-3dB)	-40		40
Vertical Beam (-3dB)	-20		20

I/O PIN ASSIGNMENT

	Pin	Description	Remarks
1	CRX	Configuration sending port	This port is the control port of the upper computer to the radar, which can be omitted. The radar works according to the default parameters.
2	CTX	Configuration receiving port
3	MD	Data output port	Radar data output port
4	+5V	Input +5.0 Power Supply	Radar power input terminal, radar working current ≥ 600mA
5	V33	Output +3.3V	External power supply port, current ≤ 150mA