Safety Training Monitoring System of Ski Resort Based on Wireless Sensor Network

Table 3

Test data in the open area.

Transmission distance (m)	10	50	100	150	200	250	300	350	400	450	500
Signal strength (dBm)	−45	−57	−65	−69	−72	−75	−80	−86	−91	−95	−97
The amount of data packets sent	100
Receive data volume	100	100	100	99	98	96	94	92	90	54	8
Packet loss rate%	0	0	0	1	2	4	6	8	10	46	92