本文選題：遙測(cè) + 軟件無線電��； 參考：《西南科技大學(xué)》2017年碩士論文

【摘要】：遙測(cè)是將測(cè)量信息通過無線通信傳輸給遠(yuǎn)距離終端的一種技術(shù),該技術(shù)被廣泛應(yīng)用于導(dǎo)彈衛(wèi)星等飛行器的飛行測(cè)試任務(wù)中。隨著遙測(cè)技術(shù)的高速發(fā)展,未來遙測(cè)系統(tǒng)的技術(shù)特點(diǎn)主要向多調(diào)制體制、高速率等方向發(fā)展,而目前國內(nèi)遙測(cè)系統(tǒng)整體表現(xiàn)為功能單一、設(shè)備兼容性差,不能夠適應(yīng)未來遙測(cè)任務(wù)的發(fā)展。針對(duì)以上現(xiàn)狀,軟件無線電(Software Defined Radio,SDR)技術(shù)提供了一種有效的解決方法,其核心思想是利用統(tǒng)一硬件平臺(tái),采用軟件方式實(shí)現(xiàn)各通信功能。本研究基于SDR設(shè)計(jì)思想,利用全數(shù)字化方法設(shè)計(jì)了一種多調(diào)制模式中頻數(shù)字遙測(cè)發(fā)射機(jī),以適應(yīng)目前及未來遙測(cè)任務(wù)的需求。本文首先對(duì)遙測(cè)信道的非線性特性和帶限特性進(jìn)行了研究分析,結(jié)合信道特性和國際遙測(cè)標(biāo)準(zhǔn)IRIG 106,選取了PCM/FM、QPSK及SOQPSK調(diào)制體制作為研究對(duì)象,并對(duì)PCM/FM、QPSK和SOQPSK的調(diào)制解調(diào)算法進(jìn)行了分析研究,仿真分析了各調(diào)制解調(diào)技術(shù)的相位特性、誤碼率和頻譜效率。針對(duì)傳統(tǒng)的PCM/FM相干解調(diào)算法載波恢復(fù)較難的缺陷,給出了一種不需要恢復(fù)載波的解調(diào)方法,可降低系統(tǒng)實(shí)現(xiàn)復(fù)雜度;同時(shí),由于現(xiàn)有SOQPSK調(diào)制信號(hào)的帶外頻譜衰減較慢,本文通過優(yōu)化其頻率脈沖函數(shù),給出了一種改進(jìn)的SOQPSK調(diào)制方法,通過仿真結(jié)果,證明了改進(jìn)后的SOQPSK調(diào)制信號(hào)具有更快的帶外衰減特性。此外,本文在加性高斯白噪聲信道環(huán)境下,對(duì)自適應(yīng)調(diào)制中的關(guān)鍵參數(shù)—信噪比,進(jìn)行了估計(jì)分析。針對(duì)幾種現(xiàn)有典型的非數(shù)據(jù)輔助信噪比估計(jì)算法存在估計(jì)精度差和估計(jì)范圍窄的缺點(diǎn),提出了一種改進(jìn)的信噪比估計(jì)算法。通過仿真說明了改進(jìn)算法的信噪比估計(jì)性能優(yōu)于原有算法,為多調(diào)制遙測(cè)系統(tǒng)的自適應(yīng)調(diào)制提供了依據(jù)。最后,本研究利用Verilog硬件描述語言編寫了各調(diào)制算法的FPGA實(shí)現(xiàn)代碼,完成了Modelsim功能仿真驗(yàn)證與實(shí)際測(cè)試,測(cè)試結(jié)果驗(yàn)證了本設(shè)計(jì)的有效性。
[Abstract]:Telemetry is a technology that transmits measurement information to remote terminals through wireless communication. It is widely used in flight test missions of missile satellites and other aircraft. With the rapid development of telemetry technology, the technical characteristics of the future telemetry system mainly develop in the direction of multi-modulation system and high speed. At present, the whole domestic telemetry system is characterized by a single function and poor equipment compatibility. Unable to adapt to the development of future telemetry missions. In view of the above situation, the software radio Defined radio SDR (Software Radio Defined) technology provides an effective solution. Its core idea is to use the unified hardware platform and software to realize the communication functions. Based on the design idea of SDR, a multi-modulation mode intermediate frequency digital telemetry transmitter is designed by using all-digital method to meet the needs of current and future telemetry tasks. In this paper, the nonlinear characteristics and band limit characteristics of telemetry channel are studied and analyzed. Combining the channel characteristics and the international telemetry standard IRIG 106, PCM / FM QPSK and SOQPSK modulation system are selected as the research objects. The modulation and demodulation algorithms of PCM / FM QPSK and SOQPSK are analyzed, and the phase characteristics, bit error rate and spectrum efficiency of each modulation and demodulation technology are simulated and analyzed. Aiming at the disadvantage of the traditional PCM/FM coherent demodulation algorithm, a demodulation method without carrier recovery is proposed, which can reduce the complexity of the system. At the same time, the out-of-band spectrum attenuation of the existing SOQPSK modulation signal is slow. This paper presents an improved SOQPSK modulation method by optimizing its frequency pulse function. The simulation results show that the modified SOQPSK modulation signal has faster out-of-band attenuation. In addition, the signal to noise ratio (SNR), a key parameter in adaptive modulation, is estimated and analyzed in additive Gao Si white noise channel. A modified SNR estimation algorithm is proposed to overcome the disadvantages of poor estimation accuracy and narrow estimation range in several typical non-data-aided SNR estimation algorithms. The simulation results show that the performance of the improved algorithm is better than that of the original algorithm, which provides a basis for adaptive modulation of multi-modulation telemetry systems. Finally, the FPGA implementation code of each modulation algorithm is compiled by using Verilog hardware description language, and the Modelsim function simulation and actual test are completed. The test results verify the validity of the design.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN911.3

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