Differential jumping frequency G function construction method
A technology of differential frequency hopping and construction method, applied in electrical components, transmission systems, etc., can solve the problems that randomness, one-dimensional uniformity and two-dimensional continuity cannot be fully satisfied, performance is not superior enough, and system complexity is high. Good anti-interception performance, simple structure, good anti-interference effect
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Embodiment 1
[0021] As shown in Fig. 2, the method of the present invention is implemented by an FPGA chip and a DDS chip. The DDS chip is AD9854, the reference clock is 100MHz, and the frequency control word is 48 bits to realize the digital frequency combiner function. Information sequence X n Enter the FPGA chip, the FPGA chip outputs a set of frequency control word K into the DDS chip AD9854, and the DDS chip outputs a differential frequency hopping signal f according to the input frequency control word K n ; G function algorithm is a simple addition of G function, "Performance Analysis of Shortwave CHESS Frequency Hopping System" (Liu Zhongying, Journal of PLA University of Science and Technology (Natural Science Edition), October 2000) has an introduction to this function, due to frequency hopping The one-to-one mapping relationship between frequency and frequency hopping code sequence, the G function algorithm in this embodiment is A n =G(X n , A n-1 ). Simple addition G function algori...
Embodiment 2
[0028] See Figure 5 for another practical example. Including FPGA chip and DDS chip, the DDS chip is AD9850, the reference clock is 10MHz, the frequency control word is 32 bits, and the digital frequency combiner function is realized. Information sequence X n Enter the FPGA chip, the FPGA chip outputs a set of frequency control word K into the digital frequency combiner, and the digital frequency combiner outputs a differential frequency hopping signal f according to the input frequency control word K n . The G function algorithm uses the G function with a (6, 1, 5) system convolutional code structure ("Analysis of Equivalent Convolutional Codes for Differential Frequency Hopping", Yang Baofeng, Journal of Jilin University (Information Science Edition), October 2006) , G function algorithm with (6, 1, 5) system convolutional code structure, M sequence generator, register, modulo N addition, 32bit frequency control word K generation, differential frequency hopping code sequence C n...
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