Application of DPX in Wideband Signal Detection

In the circumstance of complex electromagnetism, the systems for signal detection need the abilities of wideband collection and processing, high probability of intercept and capture, and meanwhile fast and exact analysis. Then, the wideband signal detection approach based on Digital phosphor technology (DPX) is proposed in this paper for complex electromagnetic environment. This method analyzes the DPX image of the received signal, and can accurately measure the frequency domain signal parameters of multiple signals. Also, the method for signal detection based on cumulative spectrum, which was made for DPX after FMM, is introduced. Furthermore, the performance of detecting the emitter signals using this method is systematically analyzed under different conditions - single signal, double signals and multiple signals existing in the same receiver band. When there is more than one signal, the relationship of frequency position is divided into separation, cross and containing. All the resolvent for every situation are particularly explained at the same time. Next, the corresponding simulation tests are presented, where the accumulation time of DPX is set as 100ms. There are three broadband signals in the frequency band. One of them doesn´t match the frequency mask and the other two signals do. The frequency of the two matching signals crosses to each other. Every 100 tests are done under the SNR of 5dB, 10dB, 15dB and 20dB, respectively. Finally, the result analysis and conclusion are discussed followed. The simulating results has demonstrated that the multiple signals existing in the same time period can be analyzed effectively by adopting the method proposed in this paper, which improves the capability of detection.