Research Of Ka & Millimeter Wave Communication Interference Technology

This dissertation conducts correlative research on confrontation technology against the wide-band and high-speed FH communication systems using Ka & Millimeter Wave frequency.This dissertation has made the following main research results and innovations:1. The transmission features of Ka & Millimeter electromagnetic waves under all kinds of climate conditions have been detailed studied, and a mechanism of using evaporation duct to implement the Ka & Millimeter Wave interference over the horizon detection has been put forward.2. The influence of part-time resident interference on the synchronic capture and tracking of FH and FH/DS communication systems has been detailed studied firstly and the conclusion of remarkable influence has been drawn.3. Based on the theory of part-time resident interference, an interfering method of comb-shape spectrum with faster hopping speed has been put forward, which can achieve an effective interference against FH and FH/DS communication systems with lower power.4. Based on analyzing the chaos feature of common FH codes, the conclusion that the common FH codes have chaos feature has been drawn. Therefore, an assumption to use the chaos theory to predict frequency of FH communication system to guide the interference has been suggested. This method can lower the interference power and ensure interference effectiveness.5. A predicting method based on relevance degree has been proposed. This method is applicable to the guidance of interference with FH communication systems and is more accurate than the chaos predicting method of the nearest points in phase space based on the traditional Euclid distance.6. According to the predicting method based on relevance degree, the method of multiple-step predicting has been put forward to shorten the predicting time.7. The capability of the predicting method based on relevance degree in the condition of partial data absence has been analyzed in details, and the negative influence conclusion of data absence has been drawn. And a solution to replace the miss data with a predicted value has been suggested.