Research On Key Techniques For High Dynamic DS/FH Spread Spectrum Communication And Its FPGA Design

High-altitude platform has found important applications in military communications, particularly suitable for high dynamic applications.Based on deep research on the principle of DS/FH hybrid spread spectrum communication system, this thesis focuses on the key techniques for DS/FH system under the high dynamic circumstance. The main works of the thesis are as follows:1. Based on high dynamic DS/FH hybrid spread spectrum communication system.a scheme with anti-jamming and anti-interception capabilities suitable for high-altitude platform applications is given.2. The direct sequences and frequency hopping sequences applied to the system are designed,and a multi-user scheme is proposed.3. An acquisition and tracking algorithm of the high dynamic DS/FH hybrid spread spectrum signal is designed. Simulations show that when the SNR is at-19dB and the terminal has an acceleration of lOg and an initial speed of1270m/s,the signal’s capture and tracking can be completed.4. The FPGA design and timing simulations of capture and carrier tracking in the receiver are implemented. Techniques, such as parallel process and pipeline architecture are adopted to speed up the whole module.