Interference Detection And Recognition Technology

As wireless communications technology development, wireless communication environment become more and more perplexed, more and more interference in wireless communication environment, jamming and anti-jamming technology to become an important research area. Reserch the anti-interference performance of a communication system, communication system can accurately detecting the interference signal at first, and then be able to take anti-jamming technology effectively; In Electronic Warfare, Investigation and anti-reconnaissance technology to be used in both of two sides; Identification the authorized signal in cognitive radio, which are inseparable from the interference detection technology. This article mainly studied several typical interference's (Single-tone interference , multi-tone interference , Partial-band interference)detection and identification technology, and take SDR hardware platforms and PC together, to achieve the interference detection and identifying system.Respectively in the Intermediate Frequency and Radio Frequency , test several typical interference's detection and identifying performance , the test results meet system requirements.Firstly,the article details the interference's detecting and identifying process, while the basic method of energy detection techniques and theories were analyzed, gives its performance evaluation of energy detection and its advantages and disadvantages, and analyzing both Consecutive Mean Excision and Forward Consecutive Mean Excision detecting algorithm's domain ideal and implementation steps.Based on the above thoughts, a statistical error rate based on sub-band interference detection algorithm is proposed. Secondly,this article study the jamming detection system based on the module design method, described the detection system timing control, data rate conversion, spectrum overlay design, spectrum output control. On this basis, designs a Jamming Detect System with silent period. Finally,Jamming Detection and Identification System's detection and recognition performance to single tone interference, multi-tone interference, narrowband interference under the IF and RF , while simulation the system's detection sensitivity of the above three jamming. Under both in the Gaussian white noise and Gaussian white noise and TDCS signals, analysis system's detection and recognition performance to single tone interference, multi-tone interference, narrowband interference.SDR test draw the following conclusions:IF under Gaussian white noise, for single-tone interference,four single tone interference, 2.4MHz Partial-Band interference,When Jamming-to-Noise power Ratio is respectively greater than -24dB, -21dB, -0.53dB,the system detection probability is greater than 99%;IF under TDCS,the single-tone interference,three single tone interference,When Jamming-to-Signal power Ratio is respectively greater than -32.2dB, -26.24dB, the system detection probability is greater than 99%;Under 400MHz RF, the single tone interference, four single tone interference, 2MHz Partial-Band interference,When JNR is respectively greater than -27.1dB, -19dB, -3.5dB,the System detection probability approaching 1;400MHz RF under TDCS,for the single-tone interference, when JSR is greater than -34dB, for two single tone interference, when JSR is greater than -30dB, for 150KHz Partial-Band interference, when JSR is greater than -20dB, the System detection probability approaching 1, better than the system requirements when JSR is greater than 0dB can accurately detect and identify interference.