Design And Implementation Of Frequency-hopping Station Transmitter End

At present, the wireless communication has got rapid development and is also essential inpeople’s daily life.Nowadays the electromagnetic environment is more and more complicated, theinterference between the communicating equipments is more serious;the available resource ofwireless frequency spectrum is limited and the crowded-band contradiction has becomeincreasingly prominent.So in order to solve the two problems of the interference and the frequencyspectrum resource, the frequency-hopping technique has been presented and the development offrequency-hopping communication has got more and more attention. Because of the excellentabilities of keeping secret, anti-jamming and multi-address communication, so that thefrequency-hopping communication has get widely used in the military field and civil areas.Atpresent frequency-hopping transceiver has become a focus in today’s military communication andhas great value in research and development.This subject comes from the VHF frequency-hopping transceiver and studies for thefrequency-hopping transmitter end-circuit. According to the technical requirements of thefrequency-hopping transmitter, this paper determines the structure of the frequency-hoppingtransmitter end-circuit. Through analysising and comparing several common solutions fortransmitters, then determines the transmitter end-circuit structure.The circuit structure includesfrequency-hopping filter, power amplifier and some auxiliary circuits such as attenuator, block filter,detection circuit, sending and receiving switch and so on. The innovation of this topic lies in thedesign of frequency-hopping filter which adopts analog filter circuit and digital terminal unitcontrolling together to achieve the frequency-hopping function, making rapidly frequency-hoppingand strongly anti-jamming.Firstly this paper introduces the background, the principle, the present situation and thedeveloping trend of frequency-hopping communication, then introduces the performanceparameters of the transmitter and implementation scheme, after contrasting and analysising theschemes, determines the end-circuit’s structure of transmitter. The third chapter firstly introducesthe principle, the classification and the performance parameters of filter; then by means of thecomparation and analysis about the implementation scheme of designing frequency-hopping filter,determines the design scheme, and introduces the design of frequency-hopping filters in detail anduses Agilent ADS simulation software to simulate and optimize the circuit and verify the feasibilityof the circuit. The fourth chapter introduces the performance index, the basic theory and designmethod of the power amplifier, and uses the ADS simulation software to simulate and optimize the circuit. The fifth chapter introduces and analysises auxiliary circuits (attenuator, block filter,detection circuit, sending and receiving switch and so on). The sixth chapter debugs the system andanalysises the test results, through the analysis of the results, the designed system meets therequirements of technical indexes. Finally analyses the problems in design and presents thesolutions.