Detection of Respiratory Signal Based on Depth Camera Body Tracking

Systematic Literature Review Regarding Heart Rate and Respiratory Rate Measurement by Means of Radar Technology

“…In 74 studies, both the heart rate and the respiratory rate were measured [2,5,10,12,. In 14 studies, only the respiratory rate was considered [3,11,13,[84][85][86][87][88][89][90][91][92][93][94], and in 26 studies, only the heart rate . Table 2 shows the number of acquisitions of the vital parameters considered in the experiments in relation to the radar type.…”

“…The number of test persons in the studies ranged from one test person [10,12,24,42,43,49,60,[85][86][87]108] to 212 test persons [98,99]. Five of the experiments were conducted with children and babies [17,45,84,88,89], eleven with miscellaneous patient groups [5,17,21,39,41,51,88,89,91,93,112] and one with animals [38], while seven experiments additionally measured a model [37,42,44,60,85,97] and two exclusively measured a model [90,92]. In 74 studies [2,3,[10][11][12][13]16,17,20,[22]…”

“…The test persons' positions relative to the radar were as follows: lying in 36 studies [2,3,5,13,17,23,28,29,[31][32][33][34]44,45,50,51,53,55,58,62,77,82,84,88,91,93,94,99,[104][105][106][107]110,112,114,120]; sitting in 60 studies [3,10,11,14-17,19,20,22,24,25,31,36,40,42,46-49,52-54,56,58-61,63,65,66,68-76, 78-80,83,85,86,88,89,96,97,100-103,109-111,113,117,118]; standing in 14 studies [3,21,26,27,39,57,72,76,81,87,110,113,…”

“…The distance between the test persons and the radar varied between 0.15 and 30 m. In 72 studies, measurements were performed at a distance of up to 1 m [2,5,10-14, 16-19,22,23,25-27,30,33-40, 42-45,48,51,55,57-59,61,63-65,70,74-80,80-84,86,92,93,95-97,100-103,107-111,113,115-117,120]. In 39 studies, the distance was between 1 and 10 m [3,10,15,20,24,31,32,37,44,[46][47][48][49][50]53,56,59,60,62,66,68,69,[71][72][73]76,79,81,85,87,88,90,91,93,94,109,112,115,119], and in 3 studies, it exceeded 10 m [31,49,81]. A total of 13 studies did not contain any information on the distance [21,28,41,54,…”

“…In five studies, radars with a central frequency in the range of <1 GHz were used [12,25,29,32,87]. In 57 studies, the radars employed used a central frequency in the range of 1-10 GHz [5,[10][11][12]15,16,19,20,22,24,27,[30][31][32]34,35,38,39,41,43,[46][47][48][49][51][52][53][54][55][57][58][59]68,69,83,[85][86][87][88][89][90][91][92][93][94]…”