In order to rationally arrange wireless underground sensor networks ( WUSN) nodes in wheat field，this paper studies the
transmission characteristics of 433MHz wireless underground sensor network during the four main growth periods of wheat． Besides，three－
dimensional surface of ＲSSI is built in four wheat growing periods through Matlab，whose fitting model and goodness of fit of ＲSSI are
obtained，and the model verification is conducted through SPASS software． In the tillering stage experiment，the minimum of goodness of fit
Ｒ2 is 0．741，the maximum is 0．927． Ｒoot mean square error is in the range of 1．518 ～ 3．372 dBm． In the jointing stage experiment，the
minimum of goodness of fit Ｒ2 is 0．664，the maximum is 0．986． Ｒoot mean square error is in the range of 0．571～ 3．491 dBm． In the heading
stage experiment，the minimum of goodness of fit Ｒ2 is 0．673，the maximum is 0．888，Ｒoot mean square error is in the range of 1．569～ 4．372
dBm． In the watery stage experiment，the minimum of goodness of fit Ｒ2 is 0．665，the maximum is 0．784． Ｒoot mean square error is in the
range of 4． 062 ～ 4． 842 dBm． The model can better predict the received signal strength under different conditions through － the － earth
communication and provide the technical support for sensor network node deployment and the establishment of the system in soil information
acquisition．
YU Xiao-qing, ZHANG Zeng-lin, GENG Yan-bin.
Ｒesearch on the Communication Characteristics of Wireless
Sensor Network in Wheat Different Breeding Stages[J].China Rural Water and Hydropower, 2019(11): 45-49
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