| Autor: |
Lei LI, Zhen-wei ZHAO, Zhen-sen WU, Le-ke LIN, Yuan LEI, Rui ZHANG |
| Jazyk: |
čínština |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
Tongxin xuebao, Vol 37, Pp 81-87 (2016) |
| Druh dokumentu: |
article |
| ISSN: |
1000-436X |
| DOI: |
10.11959/j.issn.1000-436x.2016095 |
| Popis: |
The present worst-month prediction model,however,cannot reflect the me ical characteristics of tro-poscatter propagation accurately.Hence,based on the worst-month prediction models introduced in the recommendation ITU-R P.617-3 and ITU-R P.841-4 respectively,a conversion model of annual statistics to worst-month statistics of tro-poscatter was presented.The corresponding relation between the conversion of annual statistics to worst-month statistics of troposcatter and the refractivity Nsat the earth's surface was derived with the rational n erical calculation and opti-mization method.This model not only solves the disadvantages of the ITU models mentioned above,but also has a better practicability and applicability.Then,using the new model and the trans-horizon propagation loss data banks released by the international telecommunication union(ITU),the worst-month transmission loss for the non-exceedance time percen-tages(50%,90%,99%)of interest are calculated.The prediction results are compared with the recommendation ITU-R P.841 and the trans-horizon propagation loss data banks.The conclusions are helpful for the development and the applica-tion of the troposcatter propagation. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
