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標題: | 具降低偵測錯誤率之77-GHz長距離汽車雷達收發機 A 77-GHz Long-rang Automotive Radar Transceiver With False Alarm Reduction |
作者: | Tang-Nian Luo 羅棠年 |
指導教授: | 陳怡然(Yi-Jan Chen) |
關鍵字: | 77 GHz,CMOS,偵測錯誤,積體化收發機,連續波頻率調變,干擾,毫米波汽車雷達, 77 GHz,CMOS,false alarm,FMCW,integrated transceiver,interference,millimeter-wave automotive radar, |
出版年 : | 2013 |
學位: | 博士 |
摘要: | 安全,無疑的是汽車運輸的主要議題。因為可以在白天、夜晚以及大多數的天氣狀況下良好運作,毫米波雷達有優於其他如超聲波、紅外線和雷射雷達技術的特性。毫米波長距離雷達操作在76到77 GHz,提供150公尺的自適應巡航控制範圍。自適應巡航控制系統可感測與目標的距離和相對速度,以保持足夠制動距離。由於具有比頻移鍵控式和脈衝式雷達較高的效能成本比,長距離汽車雷達最常使用的訊號類型是連續波頻率調變。隨著CMOS製程技術的發展,因為其低成本且高整合度的特性,使得CMOS毫米波電路變得更具有優勢。這使得汽車雷達可能更加普及。因為越來越多的汽車雷達在同一個鄰近區域裡操作,干擾將成為一個問題。這提高了偵測錯誤率,導致虛假目標偵測。在本論文中,我們設計了一個具有降低互相干擾之全積體化77 GHz長距離汽車雷達收發機。和直接數位頻率合成器比較,使用分數型頻率合成器產生連續波頻率調變訊號,具有小面積以及低功耗的優點。採用跳頻隨機掃頻連續波頻率調變,可以降低因互相干擾所導致的偵測錯誤率。調變使用跳頻、改變頻寬以及掃描時間的方式,使得干擾訊號在降頻之後,有如同雜訊般的響應,主要訊號得以辨認。電路使用TSMC 65奈米製程研製。晶片面積為,長1030 μm寬940 μm。接收機增益以及雜訊指數分別為23 dB以及14.8 dB。發射機的輸出功率為6.4 dBm。在1/64的輸出頻率下,多變的連續波頻率調變使用訊號分析儀的類比解調功能測試。電路總功率消耗為275毫瓦。 Safety is undoubtedly one of the most important issues of automotive transportation. The millimeter-wave (MMW) radars which can be operated well at day, night and most weather conditions are superior to the other radar technologies such as the ultrasonic, infrared and laser radars. The MMW long-range radar (LRR) which this dissertation focuses on operated at 76–77 GHz for range detection up to 150 m is used for ACC. The ACC system senses the distance and relative speed of the object vehicle in front of the sensing vehicle to adjust acceleration and deceleration of the latter to ensure safe stopping distance. Due to the high performance-to-cost ratio when compared to frequency-shift keying (FSK) and pulse radars, the most commonly used LRR is frequency-modulated continuous wave (FMCW) radar. With the development of advanced CMOS technology, CMOS has become a favorable technology for MMW circuits because of low cost and high level of integration. The availability of low cost CMOS radar transceiver is a key to wide spread adoption of 77-GHz automotive LRRs. Interference will be a serious issue when automotive radars become popular. The radar signals of the vehicles in the adjacent lanes on highway may cause interference and ghost target detection. In this dissertation, an integrated 77-GHz CMOS long-range automotive radar transceiver with the capability of mutual interference reduction is presented. A fractional-N frequency synthesizer is chosen for FMCW generation since it has the advantages of small area occupation and low power consumption compared with direct digital frequency synthesizer (DDFS) when the fine frequency tuning is required. The frequency-hopping random chirp FMCW technique is developed to lower the possibility of false alarm by making mutual interference noise-like. The center frequency of the frequency sweep may hop to another frequency at the end of every sweep cycle. Moreover, the chirp bandwidth (frequency sweep range) and slope of frequency sweep can be altered every cycle. The modulation scheme makes the interference signals less likely to be correlated to the desired signal and results in noise-like frequency response for the mutual interference after received signal is demodulated. The integrated transceiver circuit was implemented in TSMC 65-nm CMOS technology with 1P9M and the occupied silicon area is 1030 μm by 940 μm. The measured receiver gain and noise figure are 23 dB and 14.8 dB respectively. The output power delivered by the transmitter is 6.4 dBm. The frequency-hopping random chirp FMCW function is tested by using analog demodulation function of the signal analyzer after the output signal is divided by 64. The total power consumption of integrated transceiver is 275 mW. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/15557 |
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顯示於系所單位: | 電子工程學研究所 |
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