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Wideband digital channelized receiver and its key technologies

Author: CuiWei
Tutor: ChenTianZuo
School: University of Electronic Science and Technology
Course: Communication and Information System
Keywords: Electronic warfare receiver Digital channelized receiver Single-bit receiver Polyphase filter Filter bank FPGAs
CLC: TN851
Type: Master's thesis
Year: 2005
Downloads: 698
Quote: 4
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Modern electronic warfare signal environment compared to the 1980s, has been a significant change. Signal covering the whole band, all airspace; signal density, up to ten million pulses per second; forms of complex and volatile: as frequency agility signal chirp compressed signal, phase encoded signals, the pulse repetition frequency hopping signals, re-frequency uneven signals; the same time, the signal duration is shorter, the spectral width, the power spectral density is low, so that the signal having a low environmental intercepted low recognition probability. This demanding requirements of various institutional radar reconnaissance receiver. Ideal reconnaissance receiver must be within the whole band, a very high sensitivity and close to 100% probability of intercept to accurately detect the various signals, comprising detecting a plurality of signals arriving at the same time and a very weak signal, and can achieve real-time processing; simultaneously It should also take into account the small size, light weight, low price as well as a wide range of low power consumption requirements. Digital channelized receiver both discussed some of the above-mentioned requirements, has a high sensitivity and large dynamic range, a high probability of intercept receiver can digitize complex wideband modulated radar signal processing to achieve accurate measurements to improve the signal separation and identification. Excellent the separation ability of the signal environment of the high density, so that it is increasingly being applied to the accurate measurement of the environment of intensive pulse frequency. In this paper, the digital channelized receiver. Reference to the knowledge of the relevant literature and software radio theory, the key technologies of the digital channelized receiver, do the following analysis: application of the multi-phase structure optimization decimation filtering; uniform DFT filter bank tuning channel equalization and reduce The amount of computation to improve the calculation speed; using 2-fold interpolation filter output sampling rate, to increase the output bandwidth, in order to avoid in the adjacent channel between the measured frequency Fuzzy. The simulation results of the final validation of the above techniques to optimize the digital channelized receiver performance. Digital channelized receiver can not handle two simultaneous signals in the same channel, and the channel is divided into a limited number of frequency measurement accuracy is not high shortcomings in the broadband receiver, the feasibility of processing in the frequency channel after The method for study. Frequency channel after subsequent treatment program by comparing the single-bit receiver as the ideal performance. Digital channelized receiver of single-bit implementations. In a specific parameter,

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Receiver equipment, radio Radio > Receiver: the form of points
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