監(jiān)測接收機(jī)中突發(fā)信號(hào)檢測及AGC電路設(shè)計(jì)與實(shí)現(xiàn)
發(fā)布時(shí)間：2018-12-24 14:36
【摘要】：當(dāng)今無線電通信技術(shù)的發(fā)展日新月異,其應(yīng)用范圍也越來越廣,隨之而來的問題是各行各業(yè)對無線電頻譜資源的需求急速增長,同時(shí)也使得無線電通信環(huán)境日趨復(fù)雜。這種情況下對無線電頻譜資源的監(jiān)測管理勢在必行,監(jiān)測接收機(jī)作為頻譜監(jiān)測管理的核心設(shè)備,它對凈化電磁環(huán)境、提高無線電頻譜利用率具有不可替代的作用。隨著世界各國對于頻譜監(jiān)測管理工作的重視程度越來越高,監(jiān)測接收機(jī)的研制也有了長足進(jìn)步,對于監(jiān)測接收機(jī)的性能要求也越來越高。本文基于接收機(jī)動(dòng)態(tài)范圍這一指標(biāo)設(shè)計(jì)并在FPGA上實(shí)現(xiàn)了自動(dòng)增益控制系統(tǒng);基于如今突發(fā)通信機(jī)制的廣泛應(yīng)用,設(shè)計(jì)并在FPGA上實(shí)現(xiàn)了針對突發(fā)信號(hào)的突發(fā)信號(hào)檢測器。本文首先對自動(dòng)增益控制理論進(jìn)行了深入研究,然后結(jié)合本監(jiān)測接收機(jī)系統(tǒng)設(shè)計(jì)實(shí)現(xiàn)了自動(dòng)增益控制系統(tǒng)。本文設(shè)計(jì)實(shí)現(xiàn)的自動(dòng)增益控制系統(tǒng)包含射頻增益控制和基帶增益控制兩個(gè)部分。本接收機(jī)系統(tǒng)采用的射頻前端只提供了可變增益放大器卻沒有提供自動(dòng)增益控制功能,為了充分利用射頻前端,有效提高系統(tǒng)動(dòng)態(tài)范圍,采用直接計(jì)算和定步長相結(jié)合的方法在FPGA中設(shè)計(jì)實(shí)現(xiàn)了射頻增益控制系統(tǒng)。同時(shí)由于本接收機(jī)基帶帶寬可變且變化范圍大,不同帶寬下基帶信號(hào)的幅度變動(dòng)較大,針對這一特點(diǎn)本文采用誤差積分法設(shè)計(jì)實(shí)現(xiàn)了速度三檔可調(diào)、可適應(yīng)多種基帶帶寬的基帶自動(dòng)增益控制系統(tǒng)。針對突發(fā)通信越來越多的情況,本文在對突發(fā)信號(hào)檢測算法進(jìn)行深入研究之后,在FPGA中設(shè)計(jì)實(shí)現(xiàn)了適合本接收機(jī)系統(tǒng)的突發(fā)信號(hào)檢測器。該檢測器基于雙滑動(dòng)窗口法,采用雙門限設(shè)置,高門限與最大值檢測電路相結(jié)合檢測突發(fā)信號(hào)的起始位置,低門限與最小值檢測電路相結(jié)合檢測突發(fā)信號(hào)的結(jié)束位置。本文設(shè)計(jì)的基于雙滑動(dòng)窗口法的突發(fā)信號(hào)檢測器檢測具有以下特點(diǎn):門限可調(diào)、在中頻60MHz采樣率下可檢測的信號(hào)時(shí)長最小40?s且對突發(fā)信號(hào)起止位置的判斷精度能夠達(dá)到4?s,這對監(jiān)測接收機(jī)實(shí)現(xiàn)精確授時(shí)和GPS定位有直接幫助。
[Abstract]:Nowadays, with the rapid development of radio communication technology, its application scope is becoming more and more extensive. The following problems are the rapid growth of the demand for radio spectrum resources in various industries, and at the same time, the radio communication environment is becoming more and more complex. In this case, it is imperative to monitor and manage the radio spectrum resources. As the core equipment of spectrum monitoring and management, the monitoring receiver plays an irreplaceable role in purifying the electromagnetic environment and improving the radio spectrum efficiency. As more and more attention has been paid to spectrum monitoring and management in the world, the development of monitoring receivers has made great progress, and the performance requirements of monitoring receivers have become increasingly high. Based on the dynamic range of receiver, an automatic gain control system is designed and implemented on FPGA, and a burst signal detector for burst signal is designed and implemented on FPGA based on the wide application of burst communication mechanism. In this paper, the theory of automatic gain control is studied deeply, and then the automatic gain control system is designed and implemented in combination with the monitoring receiver system. The automatic gain control system designed in this paper consists of RF gain control and baseband gain control. The RF front end used in this receiver only provides variable gain amplifier but not automatic gain control function. In order to make full use of RF front end, the dynamic range of the system is improved effectively. The RF gain control system is designed and implemented in FPGA by the combination of direct calculation and fixed step size. At the same time, because the baseband bandwidth of the receiver is variable and the range of variation is large, the amplitude of the baseband signal varies greatly under different bandwidth. In view of this characteristic, the error integral method is used to design and realize the three-step adjustable speed. Baseband automatic gain control system can adapt to various baseband bandwidth. In view of more and more burst-mode communication, the burst signal detector is designed and implemented in FPGA after the research of burst signal detection algorithm. The detector is based on the double sliding window method, which uses double threshold setting, high threshold and maximum detection circuit to detect the starting position of burst signal, and low threshold and minimum detection circuit to detect the end position of burst signal. In this paper, the detection of burst signal based on double sliding window method has the following characteristics: the threshold is adjustable, At if 60MHz sampling rate, the minimum time length of the detected signal is 40 s and the accuracy of judging the starting and ending position of the burst signal can reach 4 s, which is of direct help to the precise timing and GPS positioning of the monitoring receiver.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN851
，
本文編號(hào)：2390754
[Abstract]:Nowadays, with the rapid development of radio communication technology, its application scope is becoming more and more extensive. The following problems are the rapid growth of the demand for radio spectrum resources in various industries, and at the same time, the radio communication environment is becoming more and more complex. In this case, it is imperative to monitor and manage the radio spectrum resources. As the core equipment of spectrum monitoring and management, the monitoring receiver plays an irreplaceable role in purifying the electromagnetic environment and improving the radio spectrum efficiency. As more and more attention has been paid to spectrum monitoring and management in the world, the development of monitoring receivers has made great progress, and the performance requirements of monitoring receivers have become increasingly high. Based on the dynamic range of receiver, an automatic gain control system is designed and implemented on FPGA, and a burst signal detector for burst signal is designed and implemented on FPGA based on the wide application of burst communication mechanism. In this paper, the theory of automatic gain control is studied deeply, and then the automatic gain control system is designed and implemented in combination with the monitoring receiver system. The automatic gain control system designed in this paper consists of RF gain control and baseband gain control. The RF front end used in this receiver only provides variable gain amplifier but not automatic gain control function. In order to make full use of RF front end, the dynamic range of the system is improved effectively. The RF gain control system is designed and implemented in FPGA by the combination of direct calculation and fixed step size. At the same time, because the baseband bandwidth of the receiver is variable and the range of variation is large, the amplitude of the baseband signal varies greatly under different bandwidth. In view of this characteristic, the error integral method is used to design and realize the three-step adjustable speed. Baseband automatic gain control system can adapt to various baseband bandwidth. In view of more and more burst-mode communication, the burst signal detector is designed and implemented in FPGA after the research of burst signal detection algorithm. The detector is based on the double sliding window method, which uses double threshold setting, high threshold and maximum detection circuit to detect the starting position of burst signal, and low threshold and minimum detection circuit to detect the end position of burst signal. In this paper, the detection of burst signal based on double sliding window method has the following characteristics: the threshold is adjustable, At if 60MHz sampling rate, the minimum time length of the detected signal is 40 s and the accuracy of judging the starting and ending position of the burst signal can reach 4 s, which is of direct help to the precise timing and GPS positioning of the monitoring receiver.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN851
，
本文編號(hào)：2390754
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