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Design and Realization of RF Front-end for Survival Receiver

Author: JiaoJian
Tutor: WangWei
School: Harbin Engineering University
Course: Navigation,Guidance and Control
Keywords: Radio life-saving system RF front-end Superheterodyne The LO signal source AGC
CLC: TN851
Type: Master's thesis
Year: 2011
Downloads: 51
Quote: 0
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Abstract


Disaster and accident rescue, the radio life-saving device has a pivotal role. Beidou satellite navigation based on spread spectrum radio life-saving system can timely access to victims and positioning information for the rescue operation for their time. Examples of the RF front-end receiver is an important component of the rescue system, its good performance can help to improve the overall performance of the receiver, so their design and implementation of the theory has important significance. This design and implementation of the \The signal processing platform. Firstly, according to the working environment of the rescue receiver parameters, combined with free-space propagation model proposed receiver RF front-end should satisfy the requirements of the technical indicators. For the indicator through the superheterodyne front end structure analysis and discussion, the paper introduces two down-conversion superheterodyne architecture and two digital automatic gain control (AGC) circuit of the overall solution. The program ensures that the receiver has good stability, effectively improve the receiver's image rejection ratio and dynamic range. On this basis, and based on the selected chip design parameters of the indicators are analyzed and applied RF front-end simulation software for the whole simulation, prove the feasibility of this. Then, the front-end hardware circuit design and digital AGC algorithms are studied. Hardware circuit includes amplifier circuit, the inverter circuit, a digital AGC circuit and the filter four parts, each part of the analysis of design theory given after the concrete implementation. Digital AGC algorithm is mainly divided into digital demodulation algorithm and attenuation control algorithm in two parts. Detection algorithm in the digital part, based on Hilbert transform, FFT and quadrature sampling of the three current major quadrature detection algorithms are analyzed, from detection accuracy, detection time, and hardware implementation complexity, three aspects were compared. In a combination of various factors, the proposed use of detection time is shorter, simpler hardware implementation based on orthogonal sampling detection algorithm for extracting IF signal amplitude information. Attenuation control algorithm in part, through the extracted amplitude information is compared with a threshold value to obtain the desired end attenuation control signal, thereby regulating the digital AGC circuit digital attenuator front of the main channel of the amount realized gain control. In the study of the digital AGC algorithm based on FPGA implementation of the algorithm is given and verified through a software simulation correctness of the design. Finally, the front-end circuit board test. Through the analysis of test results to prove the correctness of the hardware circuit design, the design of the RF front-end to achieve the desired functionality.

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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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