Differential jumping frequency G function construction method
A technology of differential frequency hopping and construction method, applied in the direction of electrical components, transmission systems, etc., can solve the problems of incomplete randomness, one-dimensional uniformity and two-dimensional continuity, insufficient performance, high system complexity, etc., to achieve Good anti-interception performance, simple structure, good anti-jamming effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0021] As shown in Fig. 2, the method of the present invention is realized by an FPGA chip and a DDS chip. The DDS chip is AD9854, the reference clock is 100 MHz, and the frequency control word is 48 bits to realize the function of a digital frequency combiner. 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 the differential frequency hopping signal f according to the input frequency control word K n ; The G function algorithm is a simple addition of the G function, and "The Performance Analysis of the 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. The one-to-one mapping relationship between frequency and frequency hopping code sequence, the G function algorithm is A in the present embodiment n =G(X n , A n-1 ). Simple addition G ...
Embodiment 2
[0028] Refer to FIG. 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 realizes the function of digital frequency combiner. 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 the differential frequency hopping signal f according to the input frequency control word K n . The G-function algorithm adopts the G-function with (6,1,5) systematic 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) systematic convolutional code structure, M sequence generator, register, modulo N addition, generation of 32bit frequency control word K, differential frequency hopping...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com