Spread Spectrum Timing Pulse Stable Transfer Of Key Technologies

Spread-spectrum technology has anti-jamming, anti-noise, anti-multipath fading, with confidentiality, with the concealment and low probability of intercept can be multi-site reuse and arbitrary location, high-precision measurement, etc., are widely used in communications, positioning , ranging areas. In the electronic era of confrontation, spread-spectrum technology for communications, navigation and identification information integrated system, in order to conduct joint military command and provides the most advanced communications systems. Synchronous system in the spread-spectrum system plays a central role, its performance good or bad affect the entire system reliability and applicability, as well as functionality and performance indicators. The mid-eighties, SAW devices are developing rapidly and quickly applied to the field of radar communications. SAW matched filter to solve the most critical of the spread spectrum communication pseudo-code synchronization and greatly simplifies the design of spread-spectrum receiver.This paper analyzes a more stable timing pulses technology based on spread- spectrum mode. It analyzes the several major factors that impact the stability of the pulses transfer in detail, including the leading edge degrees of the steep pulse, multi- path echo interference, receiver channel non-linear, pulse amplitude and the decision threshold level of instability and other factors. Some innovative key technologies are proposed, such as low-noise preamplifier technology; high-speed, large dynamic in place design; fast synchronous settlement expansion technology; demi point detection techniques.Started with the basic principles of spread-spectrum modulation and demodula- tion of spread-spectrum mode choice, the choice of modulation, the choice of despreading method are given a detailed analysis and discussion in this paper. And the direct sequence spread spectrum, MSK modulation, SAW matched filter despreading of the overall program are ultimately decided to be used. The main research contents are included impulse jitter measurement techniques, pulse rising time and jitter measurement relations, spread-spectrum mode, the pulse jitter and RF input power relations, receiver front-end of the relationship between noise and jitter, broadband, high-speed, large dynamic in place technology; rapid simultaneous settlement expansion techniques; demi point detection technology; rapid judgments technology.In order to achieve the spread spectrum transceiver module performance indicators better, the receiver key indicators are analyzed and designed in this paper, including sensitivity, dynamic range line of careful, and gives each unit is in the design of the specific design ideas and the use of key technologies. This article also encountered in debugging the problem, conducted in-depth discussion and analysis are given root of the problem and take the appropriate solution and effect. Finally, this system's test results and in-kind photos, test results are analyzed based on an analysis of the conclusions and propose improvement plan the next step.This paper successfully implements large dynamic range in a stable pulse trans- mission time to time and is significant for to increase the measurement precision and accuracy of wireless distance.