The Study Of Transmitting Signals Of Frequency Hopping Based On Spread Spectrum Communication

American solider had begun to research Spread Spectrum Communication since 1950's, Spread Spectrum Communication has applied in the fields of soldier communications, electronics antagonize, navigation, measure and so on. In the event of 1980's Spread Spectrum Communication is applied in the civilian communication. For satisfy the increasing needs of the civilian communication capacitance and making use of frequency band resources, all kinds of country put forward the digital honeycomb mobile communication, secondary planet mobile communication and the personal communication in the future, and these communications all make use of Spread Spectrum Communication . Spread Spectrum Communication has been widely used honeycomb phones, wireless phones, Microwave phones, wireless digital communication, measures, monitor and control, alarming and so on systems.Wireless communication often are made use of in the war communication because of its flexibility. But wireless communication in the old times work in the frequency that can not change, is easily found by counters, and easily influence, and in the end the communication lose the flexibility.The DDS(Direct Digital Frequency Synthesis ) technology developed in the several years. These technologies uses the theory and ways of advanced digital processes in the fields of signals synthesizing , All these let us know the third times of signals synthesizing. DDS(Direct Digital Frequency Synthesis) has many virtues , such as quick switching speed, the hign resolution, the hign speedy changing frequency, the characteristics of continuous in the time and phase,Signals that periods can change, and the breadth of signals can be set in advance, which can be called Signals Of Hopping Frequency. This technology is DDS(Direct Digital Frequency Synthesizer). The technology of DDS has many values, such as the speed Of hopping frequency is very high, the resolving power of frequency is also high.The technology of DDS developed in these two years. Its application is very wide in modern communication system, especially in the communication system of hopping frequency.In this paper, the program can be inputted into high-performance CMOS 8 bytes Microcomputer. When the program and hardware are all right, the design of signal of hopping frequency can be realized.The knowledge of software and hardware are introduced in detail in this paper by all kinds of table, chart and circuit diagram. In this design, the characteristics, pin configuration, and parallel/serial modes are given.In the practical application of the PCB CMOS chip, some intractable problems and its answers are given. In the conclusion of this paper, the graphics of signals of hopping frequency are introduced.