液面雷達電路之鎖相迴路設計

PLL Circuit Design of Level Radar

賴慶仁(Ching-Jen Lai)

指導教授 ： 瞿大雄

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2007年)

https://doi.org/10.6342/NTU.2007.00406

摘要

摘要

液面雷達係使用於量測貯存槽之液面距離，從而得知所貯存物質之存量。本論文是以頻率調變連續波雷達的基本原理，設計並研製液面雷達電路。頻率調變連續波雷達係發射連續訊號，且其載波頻率隨基頻訊號振幅而改變，可由接收訊號得知目標物之距離。設計電路係使用鎖相迴路產生一穩定的頻率調變訊號，經過倍頻器升頻後發射，雷達回波信號與發射信號混波後，測得其中頻訊號，經計算可得反射之液面距離，容器之存量即可得知。
論文之第一章導論係簡介液面雷達系統。第二章敘述頻率調變連續波雷達的基本原理及電路規劃。第三章則敘述電路所使用元件之特性、電路設計與佈局，以及低雜訊放大器、功率分配器、衰減器、電阻性分配器之電路製作與元件量測結果。第四章敘述各階段之測試與量測結果，以及電路整合之實測結果。第五章結論，對電路設計及量測結果予以探討。

關鍵字

液面雷達 ； 頻率調變連續波 ； 鎖相迴路

並列摘要

Abstract

Level radar is used to measure the distance of liquid level in chemical tanks, and thereby counts the amount of the content. The content of this thesis is based on the principle of FMCW radar to design and implement the level radar circuits. FMCW the signal continuously transmits to the target with frequency modulated and the target distance can be deduced from the received signal. The radar RF signal is generated from a phase-lock-loop with stabled frequencies then through a multiplier to the antenna for radiation then the radar received signal is mixed with the transmitted signal to give an intermediate frequency signal for calculating the distance. The capacitor of chemical tanks is then derived.
Chapter1 introduces the radar system of level meter and the system structure. Chapter 2 gives the description on the FMCW radar principle and the schematics of level radar. Chapter 3 then describes the characteristics of each component, circuit design, layout, circuit implementation, and measurement results of the circuits involved in the level radar. In Chapter 4 , the test and measurement results of each circuit in the system, and the measured results of a distant object are presented. Chapter 5 is the conclusion to discuss the circuit design and measurement results.

並列關鍵字

Level radar ； FMCW ； phase-lock-loop

參考文獻

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[4]陳立偉,“頻率調變連續波面雷達電路設計”,國立台灣大學電信工程學研究所碩士論文, 2005年6月。

[6] Advanced Design System Fundamentals, Agilent Technologies.

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[9]Thomas Musch, Ilona Rolfes, and Burkhard Schiek, A highly Linear Frequency Ramp Generator Based on a fractional Divider Phase-Locked-Loop, IEEE Transactions on Instrumentation and Measurement,Vol.48,No.2, Aril 1999.