FMCW系統下結合可調頻率機置之抗同頻干擾方法

論文，吾人針對FMCW雷達來研究排除頻率干擾之方法。首先，在干擾模型情境下先將基本的FMCW雷達模型建立好，再撰寫MATLAB程式以用來觀察收到干擾下之基本傳送訊號以及接收訊號。接著，吾人在傳送端多加入一跳頻混波器，目的是使其隨機選取額外混頻，使得在頻率上能夠產生移頻效果將干擾排除，準確地偵測到目標物，降低誤警報率；再使用MATLAB成功模擬排除干擾之訊號，並經由大量模擬結果來呈現在CA-CFAR以及CAGO-CFAR下的正確偵收率。最後，在對硬體複雜度做分析，使其能夠著實應用在硬體實現上。

關鍵字

跳頻； FMCW雷達

並列摘要

We investigate the adjustable frequency mechanism to eliminate the interference to frequency for FMCW radar by shifting frequency in this thesis. First, we construct the basic model of FMCW radar under the interference situation, then observe the performance of signals of transmitter and receiver with interfering signals by coding with MATLAB. However, it would raise the false alarm rate if our radar has the same frequency as the other radar does. Therefore, we add a frequency-hopping mixer at the transmitter to mix an extra frequency with the original carrier, then the interference would shift out of the bandwidth of low-pass filter so we can detect the goal accurately and lower the false alarm rate as well. Furthermore, through numerous simulations with CA-CFAR and CAGO-CFAR, we can successfully eliminate the interference by observing the results. As the final, we analyze and simplify the complex of hardware, so it can actually be used with hardware.

並列關鍵字

frequency-hopping ； FMCW radar

參考文獻

[1] P. E. Pace, Detecting and Classifying Low Probability of Intercept Radar, Artech House, Inc., 2004.

[2] A. G. Stove, “Linear FMCW radar techniques,” IEE Proc. F, vol. 139, no. 5, pp. 343-350, Oct. 1992.

[3] P. D. Beasley, et. al., “Solving the problems of a single antenna frequency modulated CW radar,” Record of the IEEE 1990 International Radar Conference, pp. 391-395, 1990.

[4] V. G. Hansen, and J. H. Sawyers, “Detectability loss due to “greatest of” selection in a cell-averaging CFAR,” IEEE Trans. Aerosp. Electron. Syst., vol. 16, no. 1, pp. 115-118, Jan. 1980.

[5] HERMANN ROHLING, “Radar CFAR Thresholding in Clutter and Multiple Target Situations,” IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS VOL. AES-19, NO. 4 JULY 1983

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FMCW系統下結合可調頻率機置之抗同頻干擾方法

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