Infant bed health monitoring method based on millimeter wave radar

Abstract

The invention discloses a crib health monitoring method based on millimeter-wave radar, which belongs to the technical field of millimeter-wave radar, and comprises the following steps: electrifying and starting the millimeter-wave radar, and entering a detection mode; judging whether the baby is on the crib or not; when the baby is in the bed state, multi-frame accumulation is carried out; judging whether the heart rate of the current infant is normal; judging whether breathing of the current baby is normal or not; judging whether the baby moves greatly or not; when the infant meets the sleep threshold, the time unit starts sleep recording; performing sleep cycle analysis on the baby; the breathing health quality and the sleep quality of the baby are evaluated, and results are transmitted to mobile terminals of parents. Real-time vital sign monitoring of the baby by the baby crib is realized based on the millimeter wave radar, breathing and heartbeat data of the baby in the baby crib can be detected, whether the baby moves greatly or not can be monitored, the sleep condition of the baby can be recorded, and the monitoring capability of the baby crib in the actual use process can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of millimeter wave radars, and in particular to a method for monitoring the health of a baby crib based on millimeter wave radars. Background Art

[0002] Cribs are very common baby products. Traditional cribs are just reduced in size for infants and have a relatively low level of intelligence. Therefore, when the baby has abnormal breathing and heartbeat, parents cannot intervene quickly, which poses a great safety hazard.

[0003] Millimeter-wave radar is a common space detection sensor that can detect vital signs of the human body in space in a non-contact manner and collect vital signs such as breathing and heartbeat.

[0004] Although there are some methods available to obtain infants' physiological conditions and sleep status, there are relatively few research programs using millimeter-wave radar.

[0005] Based on this, the present invention designs a baby crib health monitoring method based on millimeter wave radar to solve the above problems. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a method for monitoring the health of a baby crib based on millimeter-wave radar.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A method for monitoring the health of a baby crib based on millimeter wave radar comprises the following steps:

[0009] Step 1: Power on the millimeter wave radar and enter the detection mode;

[0010] Step 2: The millimeter wave radar starts detection, and each frame of data gives the bed status value K, respiratory rate r_r, heart rate r_h and abnormal movement value N;

[0011] Step 3: judging whether the baby is in the crib according to the in-bed status value K of each frame of data;

[0012] Step 4, after entering the baby in bed state, perform multi-frame accumulation to obtain statistical values ​​s{R_h, V_h, R_r, V_r} in multiple intervals, multiple interval groups S = {s1, s2, s3, s4, s5, s6, s7, s8, s9, ... sm}, and the maximum number of intervals is M; wherein, by accumulating the heart rate r_h of each interval, the heartbeat average value R_h and the heartbeat variance V_h in the interval are calculated, and the respiratory rate r_r of each interval is accumulated, and the respiratory average value R_r and the respiratory variance V_r in the interval are calculated; at the same time, obtain multiple interval abnormal values ​​n{N_a, N_v}, multiple interval groups O = {n1, n2, ... nz}, wherein N_a represents the average value of the abnormal value N of each interval, and N_v represents the variance of the abnormal value N of each interval;

[0013] Step 5: Determine whether the baby's current heart rate is normal based on the obtained heart rate average value R_h. If abnormal, issue a heart rate alarm and send the alarm information to the parent's mobile terminal;

[0014] Step 6: Determine whether the current infant's breathing is normal by using the obtained breathing average value R_r. If abnormal, issue a breathing alarm and send the alarm information to the parent's mobile terminal;

[0015] Step 7: Determine whether the baby has moved significantly by using the average value N_a of the interval abnormal value N. If abnormal, issue a significant movement alarm and send the alarm information to the parent's mobile terminal;

[0016] Step 8: Determine whether the baby has reached the threshold for falling asleep;

[0017] Step 9: When the baby meets the threshold for falling asleep, the time unit starts sleep recording;

[0018] Step 10: The time unit records the duration of the baby falling asleep and being awake;

[0019] Step 11: Analyze the baby's sleep cycle;

[0020] Step 12: Evaluate the infant's respiratory health quality. If R_r and V_r continue to meet normal requirements after entering different sleep cycles and no respiratory alarm occurs, it means that the infant's respiratory health quality is good, otherwise it is not good.

[0021] Step 13, evaluating the infant's sleep quality;

[0022] Step 14: The infant's respiratory health quality evaluation results and sleep quality evaluation results are transmitted to the processor, and the processor transmits the information to the parent's mobile terminal through the communication module.

[0023] Further, in step 2, after 20 s of calculation, the first frame of data is output, and then data is output at a frame period of 50 ms;

[0024] The specific steps of step 3 are as follows:

[0025] When K = 0, it indicates that the baby gets out of bed in this frame, Tk = Tk + 1, and Tl = 0;

[0026] When K >= 1, it indicates that the baby is in bed in this frame, Tl = Tl + 1, and Tk = 0;

[0027] When Tl > T_max, the state switches to the baby-in-bed state; otherwise, the original state is maintained;

[0028] When Tk > T_max, the state switches to the baby-out-of-bed state; otherwise, the original state is maintained;

[0029] Among them, Tk represents the continuous out-of-bed judgment value, Tl represents the continuous in-bed judgment value, and T_max represents the state switching threshold.

[0030] Further, in step 4, within every 30 s interval, 600 frames of data of the subject are measured to obtain the statistical value s{R_h, V_h, R_r, V_r} in each interval, and it is cached; meanwhile, within every 2 s interval, 40 frames of data of the subject are measured to obtain the anomaly value n{N_a, N_v} in each interval.

[0031] Further, the specific steps of step 5 are as follows:

[0032] 5.1. After obtaining the average heart rate value R_h of a 30 s interval, compare it with the preset heart rate alarm threshold:

[0033] If R_h > H_max, the radar outputs a high heart rate alarm; where H_max represents the high heart rate alarm threshold;

[0034] If R_h < H_min, the radar outputs a low heart rate alarm; where H_min represents the low heart rate alarm threshold;

[0035] 5.2. Calculate the variance V_h of the average heart rate value R_h within M consecutive intervals S = {s1, s2, s3, s4, s5, s6, s7, s8, s9, s10…, sm};

[0036] If V_h > Vs, the radar outputs an alarm for excessive heart rate fluctuation; where Vs represents the heart rate fluctuation alarm threshold;

[0037] The alarm information is transmitted to the processor, and the processor transmits the information to the parent's mobile terminal for display through the communication module.

[0038] Furthermore, the specific steps of step 6 are as follows:

[0039] 6.1 After obtaining the average respiration value R_r in a 30s interval, compare it with the preset respiration alarm threshold:

[0040] If R_r > R_max, the radar outputs a rapid respiration alarm;

[0041] wherein, R_max represents the rapid respiration alarm threshold;

[0042] If R_r < R_min, the radar outputs a slow respiration alarm;

[0043] wherein, R_min represents the slow respiration alarm threshold;

[0044] If R_r < R_c and K >= 1, the radar outputs a suffocation alarm;

[0045] wherein, R_c represents the suffocation alarm threshold;

[0046] The alarm information is transmitted to the processor, and the processor transmits the information to the mobile terminal of the parent through the communication module for display.

[0047] Furthermore, the specific steps of step 7 are as follows:

[0048] If N_a > N_max, the radar outputs a large movement alarm;

[0049] where N_max represents the large abnormal movement threshold;

[0050] The alarm information is transmitted to the processor, and the processor transmits the information to the mobile terminal of the parent through the communication module for display;

[0051] In step 8, after simultaneously meeting all the following conditions, it is determined that the sleep threshold is reached;

[0052] Within the time length L1, N_a < N_1, R_r < R_r1, R_h < R_h1;

[0053] wherein, N_1 represents the sleep movement threshold, R_r1 represents the sleep respiration rate threshold, and R_h1 represents the sleep heart rate threshold.

[0054] Furthermore, the specific steps of step 10 are as follows:

[0055] When the baby meets the sleep threshold, the time unit starts to record the sleep duration tr;

[0056] After simultaneously meeting all the following conditions, it is determined that the wake threshold is reached, and the wake duration tx is recorded, otherwise the sleep duration tr is recorded;

[0057] a、N_a>N_0;

[0058] b. R_r>R_r0, and V_r>V_r0;

[0059] c. R_h>R_h0, and V_h>V_h0;

[0060] Among them, N_0 represents the awake abnormal movement threshold, R_r0 and V_r0 represent the awake breathing rate threshold and the awake sleeping breathing rate variance threshold respectively, R_h0 and V_h0 represent the awake heart rate threshold and the awake heart rate variance threshold respectively;

[0061] When the awake time length tx is greater than the awake time length L2, the time unit ends the sleep recording.

[0062] Furthermore, the specific steps of step 11 are:

[0063] 11.1, Sleeping period: meet the sleep threshold;

[0064] 11.2. Light sleep period: When all the following conditions are met at the same time, it is judged that the light sleep threshold is reached, and the light sleep duration tq is included, and the light sleep count C2 = C2 + 1;

[0065] a、N_v <N_v2;

[0066] b. V_r <V_r2;

[0067] c. R_h <R_h2;

[0068] Among them, N_v2 represents the variance threshold of light sleep abnormal movement, V_r2 represents the variance threshold of light sleep breathing rate, and R_h2 represents the light sleep heart rate threshold;

[0069] 11.3. Sound sleep / deep sleep period: When all the following conditions are met at the same time, it is judged that the deep sleep threshold is reached, and the deep sleep duration ts is counted, and the deep sleep count C3=C3+1;

[0070] a、N_v <N_v3;

[0071] b、N_a <N_a3;

[0072] c. V_r <V_r3;

[0073] d. R_h <R_h3;

[0074] Among them, N_v3 represents the deep sleep abnormal movement variance threshold, N_a3 represents the deep sleep abnormal movement threshold (close to 0), V_r3 represents the deep sleep breathing rate variance threshold, and R_h3 represents the deep sleep heart rate threshold;

[0075] 11.4, Rapid eye movement period: When all the following conditions are met at the same time, it is judged that the rapid eye movement threshold is reached, and the rapid eye movement duration tk is counted, and the rapid eye movement count C4=C4+1;

[0076] a. N_v4 <N_v<N_v5;

[0077] b. V_r4 <V_r<V_r5;

[0078] c. V_h4 <V_h<V_h5;

[0079] Among them, N_v4 and N_v5 represent the upper and lower thresholds of the REM variance, V_r4 and V_r5 represent the upper and lower thresholds of the REM respiratory rate variance, and V_h4 and V_h5 represent the upper and lower thresholds of the REM heart rate.

[0080] Furthermore, the specific steps of step 13 are as follows:

[0081] After the sleep period, if tq, ts, tk meet the following conditions, it is considered a complete sleep cycle and the baby's sleep quality is good, otherwise it is not good;

[0082] t1 <tq+ts+tk<t2;

[0083] ts>Ts;

[0084] c2, c3, c4 are all > 1;

[0085] Among them, t1 and t2 represent the upper and lower thresholds of the infant's sleep cycle length, Ts represents the deep sleep duration threshold, c2, c3, and c4 represent the counters of light sleep, deep sleep, and rapid eye movement period, respectively; when t2 is reached, c2, c3, and c4 are all reset to zero.

[0086] Furthermore, the millimeter-wave radar is installed at the head of the crib, and the extension line of the midline of the millimeter-wave radar passes through the chest of the tested baby, and the angle between the back of the millimeter-wave radar and the vertical board of the head of the crib is 60 degrees; the millimeter-wave radar is connected to the processor, and the processor is connected to the parent's mobile terminal through the communication module. The millimeter-wave radar transmits information to the processor, and the processor transmits the information to the parent's mobile terminal through the communication module for display.

[0087] Compared with the prior art, the present invention has the following beneficial effects:

[0088] The present invention realizes real-time vital sign monitoring of infants in the crib based on millimeter wave radar. It can detect the breathing and heartbeat data of infants in the crib, monitor whether the infants move significantly (or suddenly leave the crib), and issue an alarm when abnormalities are found; it can record the infants' sleep conditions, and evaluate the infants' respiratory health quality and sleep quality. The evaluation results can be transmitted to the parents' mobile terminal for display, making it easier to understand the infants' sleep conditions. The present invention can improve the monitoring capabilities of the crib during actual use, and reduce the care burden of parents and caregivers by monitoring the infants' health information in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0089] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0090] Figure 1 This is a flow chart of a method for monitoring the health of a baby crib based on millimeter wave radar according to the present invention;

[0091] Figure 2 This is a schematic diagram of the installation structure of the millimeter-wave radar on the crib. DETAILED DESCRIPTION

[0092] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0093] Embodiment 1

[0094] In some embodiments, please refer to the attached instructions. Figure 2 The millimeter-wave radar is installed at the head of the crib, and the extended line of the midline of the millimeter-wave radar passes through the chest of the tested baby. The angle between the back of the millimeter-wave radar and the vertical board of the head of the crib is 60 degrees.

[0095] Preferably, the millimeter wave radar is fixedly mounted on the movable end of the rotating bracket, and the fixed end of the rotating bracket is fixedly mounted at the head of the baby crib. The rotating bracket can adopt any commercially available structure that can achieve angle rotation;

[0096] Preferably, the distance between the bottom of the millimeter wave radar and the bed surface of the crib is 20 cm;

[0097] The conical area of ​​120° horizontally and 80° in pitch in front of the millimeter-wave radar (the detection FOV is 120° (+-60°) horizontally and 80° (+-40°) in pitch) can completely cover the baby's movement range.

[0098] Preferably, the millimeter-wave radar adopts 60GHz multi-transmit and multi-receive millimeter-wave radar hardware.

[0099] Preferably, the millimeter wave radar is connected to the processor, the processor is connected to the parent's mobile terminal through the communication module, the millimeter wave radar transmits information to the processor, and the processor transmits the information to the parent's mobile terminal through the communication module for display;

[0100] Please refer to the instruction manual Figure 1 , a method for monitoring the health of a baby crib based on millimeter wave radar, comprising the following steps:

[0101] Step 1: Power on the millimeter wave radar and enter the detection mode;

[0102] Step 2, the millimeter wave radar starts detection, outputs the first frame of data after 20 seconds of calculation, and then outputs data with a frame period of 50 ms. Each frame of data gives the bed status value K, respiratory rate r_r, heart rate r_h and abnormal value N;

[0103] Step 3: Determine whether the baby is in the crib based on the in-bed status value K of each frame of data. The specific steps are:

[0104] When K=0, it means that the baby leaves the bed in this frame, Tk=Tk+1, Tl=0;

[0105] When K>=1, it means that the baby is in bed in this frame, Tl=Tl+1, Tk=0;

[0106] When Tl>T_max, the state switches to the baby in bed state, otherwise it remains in the original state;

[0107] When Tk>T_max, the state switches to the baby leaving the bed state, otherwise it remains in the original state;

[0108] Wherein, Tk represents the continuous bed leaving judgment value, Tl represents the continuous bed staying judgment value, and T_max represents the state switching threshold.

[0109] Step 4. After entering the state where the baby is in the crib, perform multi-frame accumulation. Measure 600 frames of data for the subject within each 30-second interval to obtain the statistical values s{R_h, V_h, R_r, V_r} for each interval, and cache them. Multiple interval groups S = {s1, s2, s3, s4, s5, s6, s7, s8, s9, … sm}, with the maximum number of intervals being M; among them, by accumulating the heart rate r_h of each interval, calculate the average heart rate R_h and the heart rate variance V_h within the interval, accumulate the respiratory rate r_r of each interval, and calculate the average respiratory rate R_r and the respiratory variance V_r within the interval; meanwhile, measure 40 frames of data for the subject within each 2-second interval to obtain the movement value n{N_a, N_v} for each interval, and cache them. Multiple interval groups O = {n1, n2, … nz}, where N_a represents the average value of the movement value N for each interval, and N_v represents the variance of the movement value N for each interval;

[0110] Step 5. Based on the obtained average heart rate R_h, determine whether the current baby's heart rate is normal. In case of abnormality, give a heart rate alarm and send the alarm information to the parent's mobile terminal; the specific steps are as follows:

[0111] 5.1. After obtaining the average heart rate value R_h of a 30s interval, compare it with the preset heart rate alarm threshold:

[0112] If R_h > H_max, the radar outputs a high heart rate alarm; where H_max represents the high heart rate alarm threshold;

[0113] If R_h < H_min, the radar outputs a low heart rate alarm; where H_min represents the low heart rate alarm threshold;

[0114] 5.2. Calculate the variance V_h of the average heart rate R_h within consecutive M intervals S = {s1, s2, s3, s4, s5, s6, s7, s8, s9, s10…, sm};

[0115] If V_h > Vs, the radar outputs an alarm for excessive heart rate fluctuation; where Vs represents the heart rate fluctuation alarm threshold;

[0116] The alarm information is transmitted to the processor, and the processor transmits the information to be displayed on the parent's mobile terminal through the communication module;

[0117] Step 6. Based on the obtained average respiratory rate R_r, determine whether the current baby's breathing is normal. In case of abnormality, give a breathing alarm and send the alarm information to the parent's mobile terminal; the specific steps are as follows:

[0118] 6.1. After obtaining the average respiratory rate R_r of a 30s interval, compare it with the preset breathing alarm threshold:

[0119] If R_r > R_max, the radar outputs an alarm for too fast breathing;

[0120] wherein, R_max represents the alarm threshold for too fast breathing;

[0121] If R_r < R_min, the radar outputs an alarm for too slow breathing;

[0122] wherein, R_min represents the alarm threshold for too slow breathing;

[0123] If R_r < R_c and K >= 1, the radar outputs an asphyxia alarm;

[0124] wherein, R_c represents the asphyxia alarm threshold;

[0125] The alarm information is transmitted to the processor, and the processor transmits the information to be displayed on the mobile terminal of the parent through the communication module;

[0126] Step 7: Determine whether the baby makes a large movement (or suddenly gets out of bed) through the average value N_a of the interval movement value N. When it is abnormal, an alarm for large movement is given and the alarm information is sent to the mobile terminal of the parent; The specific steps are as follows:

[0127] If N_a > N_max, the radar outputs an alarm for large movement;

[0128] where N_max represents the threshold for too large movement amplitude;

[0129] The alarm information is transmitted to the processor, and the processor transmits the information to be displayed on the mobile terminal of the parent through the communication module;

[0130] Step 8: Determine whether the baby meets the falling asleep conditions. After all the following conditions are met simultaneously, it is determined that the falling asleep threshold is reached;

[0131] Within the time length L1, N_a < N_1, R_r < R_r1, R_h < R_h1;

[0132] wherein, N_1 represents the falling asleep movement threshold, R_r1 represents the falling asleep breathing rate threshold, and R_h1 represents the falling asleep heart rate threshold;

[0133] Step 9: When the baby meets the falling asleep threshold, the time unit starts sleep recording;

[0134] Step 10: The time unit records the falling asleep and waking up durations of the baby. The specific steps are as follows:

[0135] When the baby meets the falling asleep threshold, the time unit starts recording the sleep duration tr;

[0136] When all of the following conditions are met at the same time, it is judged that the wakefulness threshold is reached and counted as the wakefulness time tx, otherwise it is counted as the sleep time tr;

[0137] a、N_a>N_0;

[0138] b. R_r>R_r0, and V_r>V_r0;

[0139] c. R_h>R_h0, and V_h>V_h0;

[0140] Among them, N_0 represents the awake abnormal movement threshold, R_r0 and V_r0 represent the awake breathing rate threshold and the awake sleeping breathing rate variance threshold respectively, R_h0 and V_h0 represent the awake heart rate threshold and the awake heart rate variance threshold respectively;

[0141] When the awake time length tx is greater than the awake time length L2, the time unit ends the sleep recording.

[0142] Step 11: Analyze the baby's sleep cycle. The specific steps are as follows:

[0143] 11.1, Sleeping period: meet the sleep threshold;

[0144] 11.2. Light sleep period: When all the following conditions are met at the same time, it is judged that the light sleep threshold is reached, and the light sleep duration tq is included, and the light sleep count C2 = C2 + 1;

[0145] a、N_v <N_v2;

[0146] b. V_r <V_r2;

[0147] c. R_h <R_h2;

[0148] Among them, N_v2 represents the variance threshold of light sleep abnormal movement, V_r2 represents the variance threshold of light sleep breathing rate, and R_h2 represents the light sleep heart rate threshold;

[0149] 11.3. Sound sleep / deep sleep period: When all the following conditions are met at the same time, it is judged that the deep sleep threshold is reached, and the deep sleep duration ts is counted, and the deep sleep count C3=C3+1;

[0150] a、N_v <N_v3;

[0151] b、N_a <N_a3;

[0152] c. V_r <V_r3;

[0153] d. R_h <R_h3;

[0154] Among them, N_v3 represents the deep sleep abnormal movement variance threshold, N_a3 represents the deep sleep abnormal movement threshold (close to 0), V_r3 represents the deep sleep breathing rate variance threshold, and R_h3 represents the deep sleep heart rate threshold;

[0155] 11.4, Rapid eye movement period: When all the following conditions are met at the same time, it is judged that the rapid eye movement threshold is reached, and the rapid eye movement duration tk is counted, and the rapid eye movement count C4=C4+1;

[0156] a. N_v4 <N_v<N_v5;

[0157] b. V_r4 <V_r<V_r5;

[0158] c. V_h4 <V_h<V_h5;

[0159] Among them, N_v4 and N_v5 represent the upper and lower thresholds of the REM variance, V_r4 and V_r5 represent the upper and lower thresholds of the REM respiratory rate variance, and V_h4 and V_h5 represent the upper and lower thresholds of the REM heart rate.

[0160] Step 12: Evaluate the infant's respiratory health quality. If R_r and V_r continue to meet normal requirements after entering different sleep cycles and no respiratory alarm occurs, it means that the infant's respiratory health quality is good, otherwise it is not good.

[0161] Step 13: Evaluate the baby's sleep quality. The specific steps are as follows:

[0162] After the falling asleep period, if tq, ts, tk meet the following conditions, it is considered a complete sleep cycle and the baby's sleep quality is good, otherwise it is not good;

[0163] t1 <tq+ts+tk<t2;

[0164] ts>Ts;

[0165] c2, c3, c4 are all > 1;

[0166] Among them, t1 and t2 represent the upper and lower thresholds of the infant's sleep cycle length, Ts represents the deep sleep duration threshold, c2, c3, and c4 represent the counters of light sleep, deep sleep, and rapid eye movement period, respectively; when t2 is reached, c2, c3, and c4 are all reset to zero.

[0167] Step 14: transmitting the infant's respiratory health quality evaluation results and sleep quality evaluation results to the processor, and the processor transmits the information to the parent's mobile terminal through the communication module;

[0168] The present invention realizes real-time vital sign monitoring of infants in the crib based on millimeter wave radar. It can detect the breathing and heartbeat data of infants in the crib, monitor whether the infants move significantly (or suddenly leave the crib), and issue an alarm when abnormalities are found; it can record the infants' sleep conditions, and evaluate the infants' respiratory health quality and sleep quality. The evaluation results can be transmitted to the parents' mobile terminal for display, making it easier to understand the infants' sleep conditions. The present invention can improve the monitoring capabilities of the crib during actual use, and reduce the care burden of parents and caregivers by monitoring the infants' health information in real time.

[0169] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for monitoring the health of a baby bed based on millimeter wave radar, characterized in that: The following steps are involved: Step 1: Power on the millimeter wave radar and enter the detection mode; Step 2: The millimeter wave radar starts detection, and each frame of data gives the bed status value K, respiratory rate r_r, heart rate r_h and abnormal movement value N; Step 3: judging whether the baby is in the crib according to the in-bed status value K of each frame of data; Step 4, when the baby is in bed, multiple frames are accumulated to obtain statistical values ​​s{R_h, V_h, R_r, V_r} in multiple intervals, multiple interval groups S = {s1, s2, s3, s4, s5, s6, s7, s8, s9, ... sm}, and the maximum number of intervals is M; wherein, the heart rate r_h of each interval is accumulated, the heartbeat average value R_h and the heartbeat variance V_h in the interval are calculated, and the respiratory rate r_r of each interval is accumulated, and the respiratory average value R_r and the respiratory variance V_r in the interval are calculated; at the same time, multiple interval abnormal values ​​n{N_a, N_v} are obtained, multiple interval groups O = {n1, n2, ... nz}, wherein N_a represents the average value of the abnormal value N of each interval, and N_v represents the variance of the abnormal value N of each interval; Step 5: Determine whether the baby's current heart rate is normal based on the obtained heart rate average value R_h. If abnormal, issue a heart rate alarm and send the alarm information to the parent's mobile terminal; Step 6: Determine whether the current infant's breathing is normal by using the obtained breathing average value R_r. If abnormal, issue a breathing alarm and send the alarm information to the parent's mobile terminal; Step 7: Determine whether the baby has moved significantly by using the average value N_a of the interval abnormal value N. If abnormal, issue a significant movement alarm and send the alarm information to the parent's mobile terminal; Step 8: Determine whether the baby has reached the threshold for falling asleep; Step 9: When the baby meets the threshold for falling asleep, the time unit starts sleep recording; Step 10: The time unit records the duration of the baby falling asleep and being awake; Step 11: Analyze the baby's sleep cycle; Step 12: Evaluate the infant's respiratory health quality. If R_r and V_r continue to meet normal requirements after entering different sleep cycles and no respiratory alarm occurs, it means that the infant's respiratory health quality is good, otherwise it is not good. Step 13, evaluating the infant's sleep quality; Step 14: The infant's respiratory health quality evaluation results and sleep quality evaluation results are transmitted to the processor, and the processor transmits the information to the parent's mobile terminal through the communication module.

2. The method for monitoring the health of a baby crib based on millimeter wave radar according to claim 1, characterized in that: In step 2, the first frame of data is output after 20 seconds of calculation, and then data is output with a frame period of 50 ms; The specific steps of step 3 are: When K=0, it means that the baby leaves the bed in this frame, Tk=Tk+1, Tl=0; When K>=1, it means that the baby is in bed in this frame, Tl=Tl+1, Tk=0; When Tl>T_max, the state switches to the baby in bed state, otherwise it remains in the original state; When Tk>T_max, the state switches to the baby leaving the bed state, otherwise it remains in the original state; Wherein, Tk represents the continuous bed leaving judgment value, Tl represents the continuous bed staying judgment value, and T_max represents the state switching threshold.

3. The method for monitoring the health of a baby crib based on millimeter wave radar according to claim 2, characterized in that: In step 4, within each 30 - second interval, 600 - frame data of the subject under test is measured to obtain the statistical values s{R_h, V_h, R_r, V_r} for each interval, and they are cached; meanwhile, within each 2 - second interval, 40 - frame data of the subject under test is measured to obtain the abnormal change values n{N_a, N_v} for each interval.

4. The method for monitoring the health of a baby crib based on millimeter wave radar according to claim 3, characterized in that: The specific steps of step 5 are as follows: 5.

1. After obtaining the average heart rate value R_h of a 30 - s interval, compare it with the preset heart rate alarm threshold: If R_h > H_max, the radar outputs a high - heart - rate alarm; where H_max represents the high - heart - rate alarm threshold; If R_h < H_min, the radar outputs a low - heart - rate alarm; where H_min represents the low - heart - rate alarm threshold; 5.

2. Calculate the variance V_h of the average heart rate R_h within consecutive M intervals S = {s1, s2, s3, s4, s5, s6, s7, s8, s9, s10…, sm}; If V_h > Vs, the radar outputs an alarm for excessive heart - rate fluctuation; where Vs represents the heart - rate fluctuation alarm threshold; The alarm information is transmitted to the processor, and the processor transmits the information to the parent's mobile terminal for display through the communication module.

5. The method for monitoring the health of a baby crib based on millimeter wave radar according to claim 4, characterized in that: The specific steps of step 6 are as follows: 6.

1. After obtaining the average respiration value R_r of a 30 - s interval, compare it with the preset respiration alarm threshold: If R_r > R_max, the radar outputs a rapid - respiration alarm; where R_max represents the rapid - respiration alarm threshold; If R_r < R_min, the radar outputs a slow - respiration alarm; where R_min represents the slow - respiration alarm threshold; If R_r < R_c and K >= 1, the radar outputs a suffocation alarm; where R_c represents the suffocation alarm threshold; The alarm information is transmitted to the processor, and the processor transmits the information to the parent's mobile terminal for display through the communication module.

6. The method for monitoring the health of a baby crib based on millimeter wave radar according to claim 5, characterized in that: The specific steps of step 7 are as follows: If N_a > N_max, the radar outputs a large - movement alarm; where N_max represents the threshold for excessive abnormal movement; The alarm information is transmitted to the processor, and the processor transmits the information to the parent's mobile terminal for display through the communication module; In step 8, after simultaneously meeting all the following conditions, it is determined that the sleep threshold is reached; Within the time length L1, N_a < N_1, R_r < R_r1, R_h < R_h1; where N_1 represents the sleep abnormal - movement threshold, R_r1 represents the sleep respiration rate threshold, and R_h1 represents the sleep heart - rate threshold.

7. The method for monitoring infant bed health based on millimeter wave radar according to claim 6, characterized in that: The specific steps of step 10 are as follows: When the baby meets the sleep threshold, the time unit starts to record the sleep duration tr; After simultaneously meeting all the following conditions, it is determined that the wake - up threshold is reached, and the wake - up duration tx is recorded, otherwise the sleep duration tr is recorded; a. N_a > N_0; b. R_r > R_r0 and V_r > V_r0; c. R_h > R_h0 and V_h > V_h0; Among them, N_0 represents the awake abnormal movement threshold, R_r0 and V_r0 represent the awake breathing rate threshold and the awake sleeping breathing rate variance threshold respectively, R_h0 and V_h0 represent the awake heart rate threshold and the awake heart rate variance threshold respectively; When the awake time length tx is greater than the awake time length L2, the time unit ends the sleep recording.

8. The method for monitoring the health of a baby crib based on millimeter wave radar according to claim 7, characterized in that: The specific steps of step 11 are: 11.1, Sleeping period: meet the sleep threshold; 11.

2. Light sleep period: When all the following conditions are met at the same time, it is judged that the light sleep threshold is reached, and the light sleep duration tq is included, and the light sleep count C2 = C2 + 1; a、N_v <N_v2; b. V_r <V_r2; c. R_h <R_h2; Among them, N_v2 represents the variance threshold of light sleep abnormal movement, V_r2 represents the variance threshold of light sleep breathing rate, and R_h2 represents the light sleep heart rate threshold; 11.

3. Sound sleep / deep sleep period: When all the following conditions are met at the same time, it is judged that the deep sleep threshold is reached, and the deep sleep duration ts is counted, and the deep sleep count C3=C3+1; a、N_v <N_v3; b、N_a <N_a3; c. V_r <V_r3; d. R_h <R_h3; Among them, N_v3 represents the deep sleep abnormal movement variance threshold, N_a3 represents the deep sleep abnormal movement threshold (close to 0), V_r3 represents the deep sleep breathing rate variance threshold, and R_h3 represents the deep sleep heart rate threshold; 11.4, Rapid eye movement period: When all the following conditions are met at the same time, it is judged that the rapid eye movement threshold is reached, and the rapid eye movement duration tk is counted, and the rapid eye movement count C4=C4+1; a. N_v4 <N_v<N_v5; b. V_r4 <V_r<V_r5; c. V_h4 <V_h<V_h5; Among them, N_v4 and N_v5 represent the upper and lower thresholds of the REM variance, V_r4 and V_r5 represent the upper and lower thresholds of the REM respiratory rate variance, and V_h4 and V_h5 represent the upper and lower thresholds of the REM heart rate.

9. The method for monitoring infant bed health based on millimeter wave radar according to claim 8, characterized in that: The specific steps of step 13 are as follows: After the falling asleep period, if tq, ts, tk meet the following conditions, it is considered a complete sleep cycle and the baby's sleep quality is good, otherwise it is not good; t1 <tq+ts+tk<t2; ts>Ts; c2, c3, c4 are all > 1; Among them, t1 and t2 represent the upper and lower thresholds of the infant's sleep cycle length, Ts represents the deep sleep duration threshold, c2, c3, and c4 represent the counters of light sleep, deep sleep, and rapid eye movement period, respectively; when t2 is reached, c2, c3, and c4 are all reset to zero.

10. The method for monitoring infant bed health based on millimeter wave radar according to claim 8, characterized in that: The millimeter-wave radar is installed at the head of the crib, and the midline extension line of the millimeter-wave radar passes through the chest of the tested baby, and the angle between the back of the millimeter-wave radar and the vertical board of the head of the crib is 60 degrees; the millimeter-wave radar is connected to the processor, and the processor is connected to the parent's mobile terminal through the communication module. The millimeter-wave radar transmits information to the processor, and the processor transmits the information to the parent's mobile terminal through the communication module for display.

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