Human Activity and IdentityMulti-Task Recognition Based on Convolutional Neural Network Using Doppler Radar

Fig. 2. Radar time-frequency spectrograms of radar for six human activities. (a) Walking; (b) boxing; (c) crawling on the ground; (d) diving; (e) standing forward and jumping; (f) running

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Fig. 3. Structural diagram of SE module

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Fig. 4. Multi-task recognition model structure based on CNN

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Fig. 5. Diagram of joint loss function generation

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Fig. 6. Loss and accuracy curves. (a) Loss curves; (b) accuracy curves

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Table 1. Results of multi-task and single-task recognitions

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Table 1. Results of multi-task and single-task recognitions

Crossvalidationset No.	Recognitionrate of MR /%			Recognitionrate of SR /%
Crossvalidationset No.	HA	HD	HT	HA	HD	HT
1	99.94	98.78	98.74	99.70	95.99	95.72
2	99.94	98.80	98.77	99.88	96.70	96.93
3	99.97	98.90	98.89	99.90	97.91	97.84
4	100.00	99.93	99.93	99.96	99.37	99.34
Mean	99.96	99.10	99.08	99.86	97.49	97.38

Table 2. Recognition results of different network structures
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Table 2. Recognition results of different network structures
Model Recognition rate /%
HA HD HT
D-MSSE 99.98 99.62 99.61
D-MS 100 99.88 99.88
D-SE 99.99 90.47 90.47

Table 3. Recognition results of different loss optimization
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Table 3. Recognition results of different loss optimization
Loss Recognition rate /%
HA HD HT
L_E 99.99 99.74 99.73
L_E +L_M 99.99 99.86 99.86
L_E+L_C 100 99.87 99.86

Table 4. Recognition results under different STFT window lengths
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Table 4. Recognition results under different STFT window lengths
L /s Recognition rate /%
HA HD HT
0.2 97.99 78.59 77.68
0.4 99.75 89.25 89.13
0.6 99.91 92.47 92.44
0.8 99.98 99.73 99.71

Table 5. Recognition results under different N_SR
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Table 5. Recognition results under different N_SR
N_SR /dB Recognition rate /%
HA HD HT
-20 67.53 24.4 19.06
-10 96.91 77.63 76.49
0 99.91 90.8 90.75
10 99.99 99.5 99.49
+∞ 100 99.93 99.93

Table 6. Recognition results under different training data sizes
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Table 6. Recognition results under different training data sizes
Data size Recognition rate /%
HA HD HT
400 99.94 97.52 97.46
600 99.97 99.71 99.57
800 99.97 99.62 99.59
1000 99.99 99.76 99.75
1300 99.99 99.85 99.84
1500 100 99.93 99.93

Table 7. Comparison of results of algorithms
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Table 7. Comparison of results of algorithms
Algorithm Recognition rate /%
HA HD HT
PRGC 99.94 98.9 98.84
MRN 99.97 99.9 99.85.
MCNN 100 99.93 99.93

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Hou Chunping, Jiang Tianli, Lang Yue, Yang Yang. Human Activity and IdentityMulti-Task Recognition Based on Convolutional Neural Network Using Doppler Radar[J]. Laser & Optoelectronics Progress, 2020, 57(2): 21009

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