Fast Lookup Method Of Finding The Illegal Radio Transmitters In Kunming Based On Radio Transmission Model

Illegal radio means without the approval of the radio management departments and departments of radio and television,and allowed to set up illegal radio station broadcast on radio frequency by social publicity In recent years,the criminals set without illegal radio,wantonly selling drugs,fake,fraud and other criminal activities,not only disrupt social order,causing serious disruption to the civil aviation safety and legal radio,but also on people's health caused some harm."12th Five-Year" period,the national radio management institutions were investigated and dealt with more than 6500 radio interference,including more than 3300 illegal radio case;Yunnan illegal radio mainly concentrated around Kunming City,has handled more than 70 illegal radio equipment,other city and the relatively illegal radio is relatively small,Nujiang and Diqing did not find the illegal radio.Combined with the practical work to find the illegal radio in the downtown areas of Kunming,the illegal radio cause,harm,principle,development trend,search methods are introduced in detail;the data dealt with in illegal radio,studied the transmission characteristics of Kunming illegal transmission,selected radio transmission model for Kunming city according to the actual illegal radio station seized the location,emission parameters,the Okumura-Hata transmission model was optimized,joined the building density factor is modified,and the applicability of the new model was verified with the transceiver;the reciprocity theorem,the new model was applied to the actual work to find the illegal radio.Not only improves the positioning accuracy,but also save the technical personnel of the radio monitoring of search time,locate and illegal radio provides the technical support to achieve The utility model has good effect and has certain application value.The article also combined with the actual Kunming region of the ultrashort wave monitoring network construction and future wireless control tube facing the new situation and new requirements,suggestions on the radio monitoring network layout of the next stage,the forward-looking and certain exploration.