Research On DRFM Technology And Its Application

With the development of radar anti-interference technology,it is necessary for electronic countermeasure to have superior performance.Comparing with traditional jammer,Digital Radio Frequency Memory(DRFM)reach up to higher fidelity in storing the radar Radio Frequency signal,which can remedy the traditional jammer with the deficiency functionally and provide enhanced capabilities for modern electronic-countermeasures.It has been the indispensable subsystem for the modern jammer.This paper compare and analyze the DRFM principle,structure and important parameters,and explain how what have been analysed the impact on performance of digital radio frequency.In the end,this paper puts forward the key technology to make DRFM have high performance.The concrete content of the thesis includes:1.The fist part has expounded purpose and significance that the problem studies and DRFM technology present situation and main DRFM application field,have built a theory and technology background.2.The second part briefly introduces the history and current of electronic countermeasure and radar interference,the radar signal environment has been analyzed via being modeled.quantifies the modern radar and opposes the signal environment through modeling,have put forward the modern electron performance demand for interfering with the apparatus to the radar signal environment.3.The paper expatiate the necessity for jammer to guide frequency,and analyzed several traditional guide frequency technologies,and then discussed their technological characteristic,structure,advantage and disadvantage.4.Having analyzed the function,principle of the DRFM,and analyzed several kinds of typical structure.Mainly analyzed and compared amplitude quantization and phase quantization principle of DRFM,pointed out one's own advantage and disadvantage.In the end,briefly introduce several kinds of own performance parameters of investing DRFM employed abroad. 5.Based on various structure and quantization number,mainly analyzes instantaneous bandwidth,dynamic range,quantization noise,spurious singal level, frequency and phase error,etc.According to the analysis conclusion,points out the measure to enhance the DRFM performance.6.Mainly analyzes how system clock,local frequency drifting and sampling period affect the coherence,and analyzes how pure quantization noise,input noise and timing and synchronous frequency shifting affect the signal-noise-ratio(SNR).In the end,analyzes the coherence and SNR how to effect on interfering result.7.The 7th chapter has set forth the design process being 3 bit of phase quantization DRFM of core owing to CPLD component.Be aimed at the index applying concretely mainly,union main body of a book the analysis conclusion that self own gets,has made clear that system scheme,technology approach and system design the key technology should think mainly,has analysed the function and advantage simulating wiring design software Altium Designer 6.0 sums figures wiring design software ISE 8.2 i main part,has analysed system clock circuit,the way simulating circuit and circuital realization of figure.Have given the testing designing that originally out result as well as system simulates and have tested wave form finally.