發(fā)布時(shí)間：2018-05-26 06:33

  本文選題：隔離 + 采集��； 參考：《中北大學(xué)》2015年碩士論文

【摘要】：在航天測試領(lǐng)域，通過監(jiān)測并分析各個(gè)測量信號(hào)數(shù)據(jù)，工作人員可以深入了解飛行器的各工作環(huán)境數(shù)據(jù)與工作狀態(tài)，為分析飛行器工作性能與故障檢驗(yàn)提供了依據(jù)，這些測量參數(shù)對后續(xù)提高飛行器性能所做的改進(jìn)設(shè)計(jì)異常重要。本設(shè)計(jì)要求采集并存儲(chǔ)多路模擬信號(hào)與PCM串行數(shù)據(jù)信號(hào)，并且多路信號(hào)之間要求彼此隔離，互不干涉，從而得到該飛行器測量所需重要參數(shù)。 將“信號(hào)全隔離”的設(shè)計(jì)思想應(yīng)用在課題設(shè)計(jì)之中，重點(diǎn)對信號(hào)和電源這兩大部分進(jìn)行隔離。對于在自檢模式下地面測試設(shè)備輸入或者整機(jī)聯(lián)試模式下系統(tǒng)輸出的六路模擬電壓速變量信號(hào)，使用線性光耦芯片對模擬信號(hào)構(gòu)成光耦隔離電路進(jìn)行隔離。其中，一路PCM數(shù)字量信號(hào)與六路模擬電壓信號(hào)必須隔離，六路模擬信號(hào)內(nèi)部亦彼此隔離。六路模擬電壓信號(hào)進(jìn)入測量裝置后先經(jīng)過隔離電路、再由A/D變換與采樣數(shù)據(jù)信息，將其存儲(chǔ)于FLASH中。與此同時(shí)，PCM數(shù)字量碼流數(shù)據(jù)全程存儲(chǔ)于FLASH中，并且兩組數(shù)據(jù)互不干擾。對于電源供電模塊，課題為測量裝置設(shè)計(jì)了一種智能選擇供電的方式，提供了遙測系統(tǒng)外部供電和存儲(chǔ)裝置自帶鋰電池供電這兩種方法。為了避免諸如落地瞬間或其他突發(fā)狀況對飛行器造成較大沖擊，從而導(dǎo)致系統(tǒng)整體瞬間斷電，破壞采集存儲(chǔ)裝置整個(gè)工作過程正常供電的需求，課題除了依靠飛行器遙測系統(tǒng)向其提供二次供電外，特別設(shè)計(jì)添加了鋰電池自供電電源模塊。將不帶電常開觸點(diǎn)信號(hào)“控制解�！弊鳛闇y量裝置鋰電池自供電模塊的工作啟動(dòng)信號(hào)，同外部電源供電模塊一齊保障了測量裝置整體機(jī)智能供電切換的實(shí)現(xiàn)。 為采集飛行器落地瞬間六路電壓參數(shù)與一路PCM碼流數(shù)據(jù)參數(shù),在電源隔離的同時(shí)，擬設(shè)計(jì)一種基于線性光耦HCNR201和A/D模數(shù)轉(zhuǎn)換器ADS8365的新型采集存儲(chǔ)測量裝置，用于實(shí)現(xiàn)六路模擬電壓直流信號(hào)的采集和PCM數(shù)字量信號(hào)的接收，并在FLASH中存儲(chǔ)有效數(shù)據(jù)。這里應(yīng)用光耦隔離芯片HCNR201構(gòu)成光耦隔離電路用于隔離六路0~5V模擬電壓信號(hào)，由Xilinx公司生產(chǎn)的FPGA控制A/D模數(shù)轉(zhuǎn)換器ADS8365對其采編，采用RS-422異步串行接口電路接收一路PCM數(shù)字量碼流信號(hào)，將模擬量與數(shù)字量數(shù)據(jù)進(jìn)行數(shù)模混合編幀后轉(zhuǎn)存寫入FLASH中。文章重點(diǎn)闡述了采集存儲(chǔ)測量裝置的關(guān)鍵技術(shù)解決方案、系統(tǒng)硬件電路設(shè)計(jì)以及FPGA代碼邏輯設(shè)計(jì)。實(shí)際測試所采集的模擬量波形穩(wěn)定，所存儲(chǔ)數(shù)據(jù)完整可靠。 實(shí)踐證明,該系統(tǒng)可以成功隔離并采集到多路信號(hào),滿足設(shè)計(jì)需求。
[Abstract]:In the field of spaceflight testing, by monitoring and analyzing the data of each measurement signal, the staff can deeply understand the working environment data and the working state of the aircraft, which provides the basis for analyzing the performance and fault inspection of the aircraft. These measurement parameters are very important to improve the design of aircraft performance. This design requires the acquisition and storage of multi-channel analog signals and PCM serial data signals, and the multi-channel signals should be isolated from each other and non-interference with each other, so that the important parameters needed for the aircraft measurement can be obtained. The design idea of "complete signal isolation" is applied to the design of the subject, with the emphasis on the isolation of the signal and the power supply. For the six-channel analog voltage and velocity variable signal output from the ground test equipment input or the whole machine combined test mode, a linear optical coupling chip is used to isolate the analog signal to form the optocoupler isolation circuit. One PCM digital signal must be isolated from the six-channel analog voltage signal, and the six-channel analog signal must also be isolated from each other. The six-channel analog voltage signal enters the measuring device and passes through the isolation circuit first, then transforms and samples the data information by the A / D, and stores it in the FLASH. At the same time, the digital bitstream data is stored in FLASH all the time, and the two groups of data do not interfere with each other. For the power supply module, an intelligent power supply mode is designed for the measuring device, and two methods are provided for the external power supply of the telemetry system and the lithium battery power supply for the storage device. In order to avoid the impact on the aircraft, such as landing moment or other sudden situation, which results in the whole system being cut off in an instant, the demand of normal power supply for the whole working process of the acquisition and storage device is destroyed. In addition to providing secondary power supply to aircraft telemetry system, a lithium battery self-powered power supply module is specially designed. The "control unprotected" signal is used as the working start signal of the lithium battery self-supply module of the measuring device, and the realization of intelligent power supply switch of the whole measuring unit is guaranteed together with the external power supply module. In order to collect the parameters of six voltages and one PCM stream data at landing moment, a novel acquisition and storage device based on linear optocoupler HCNR201 and A / D converter ADS8365 is designed while the power source is isolated. It is used to realize the acquisition of six analog voltage DC signals and the reception of PCM digital signals, and to store effective data in FLASH. In this paper, the optocoupler isolation circuit (HCNR201) is used to isolate six analog voltage signals of 0 ~ 5V, which is compiled by FPGA controlled A / D converter (ADS8365) produced by Xilinx Company. The RS-422 asynchronous serial interface circuit is used to receive one PCM digital bitstream signal, and the analog and digital data are mixed into frames and then transferred to FLASH. This paper focuses on the key technical solution of the acquisition and storage measurement device, the design of the hardware circuit of the system and the logic design of the FPGA code. The measured analog waveform is stable and the stored data is complete and reliable. Practice shows that the system can isolate and collect multiple signals successfully and meet the design requirements.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：V416.8

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