本文選題：隔離 + 采集��； 參考：《中北大學》2015年碩士論文

【摘要】：在航天測試領域，通過監(jiān)測并分析各個測量信號數據，工作人員可以深入了解飛行器的各工作環(huán)境數據與工作狀態(tài)，為分析飛行器工作性能與故障檢驗提供了依據，這些測量參數對后續(xù)提高飛行器性能所做的改進設計異常重要。本設計要求采集并存儲多路模擬信號與PCM串行數據信號，并且多路信號之間要求彼此隔離，互不干涉，從而得到該飛行器測量所需重要參數。 將“信號全隔離”的設計思想應用在課題設計之中，重點對信號和電源這兩大部分進行隔離。對于在自檢模式下地面測試設備輸入或者整機聯(lián)試模式下系統(tǒng)輸出的六路模擬電壓速變量信號，使用線性光耦芯片對模擬信號構成光耦隔離電路進行隔離。其中，一路PCM數字量信號與六路模擬電壓信號必須隔離，六路模擬信號內部亦彼此隔離。六路模擬電壓信號進入測量裝置后先經過隔離電路、再由A/D變換與采樣數據信息，將其存儲于FLASH中。與此同時，PCM數字量碼流數據全程存儲于FLASH中，并且兩組數據互不干擾。對于電源供電模塊，課題為測量裝置設計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，從而導致系統(tǒng)整體瞬間斷電，破壞采集存儲裝置整個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，特別設計添加了鋰電池自供電電源模塊。將不帶電常開觸點信號“控制解�！弊鳛闇y量裝置鋰電池自供電模塊的工作啟動信號，同外部電源供電模塊一齊保障了測量裝置整體機智能供電切換的實現(xiàn)。 為采集飛行器落地瞬間六路電壓參數與一路PCM碼流數據參數,在電源隔離的同時，擬設計一種基于線性光耦HCNR201和A/D模數轉換器ADS8365的新型采集存儲測量裝置，用于實現(xiàn)六路模擬電壓直流信號的采集和PCM數字量信號的接收，并在FLASH中存儲有效數據。這里應用光耦隔離芯片HCNR201構成光耦隔離電路用于隔離六路0~5V模擬電壓信號，由Xilinx公司生產的FPGA控制A/D模數轉換器ADS8365對其采編，采用RS-422異步串行接口電路接收一路PCM數字量碼流信號，將模擬量與數字量數據進行數�；旌暇帋筠D存寫入FLASH中。文章重點闡述了采集存儲測量裝置的關鍵技術解決方案、系統(tǒng)硬件電路設計以及FPGA代碼邏輯設計。實際測試所采集的模擬量波形穩(wěn)定，所存儲數據完整可靠。 實踐證明,該系統(tǒng)可以成功隔離并采集到多路信號,滿足設計需求。
[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.
【學位授予單位】：中北大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：V416.8

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