基于幅度調制的連續(xù)微波雷達測距研究
doi: 10.11999/JEIT140238 cstr: 32379.14.JEIT140238
基金項目:
國家自然科學基金(51078369)和中央高校基本科研業(yè)務費科研專項項目(CDJXS10120002)資助課題
Investigation on Ranging of the Continuous Microwave Radar Based on Amplitude Modulation
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摘要: 為實現實時快速的全天候、高精度、大范圍測距，該文提出了基于幅度調制的微波雷達測距方法。在分析主要微波雷達特點的基礎上，深入探討了該方法測尺頻率和測距范圍、精度之間的數學關系，并利用調制在高頻載波的低頻信號滿足大范圍測距需求，采用基于測時技術的高精度測相方法實現高精度與高速度測距，并基于混頻器、測時芯片TDC-GP2等器件搭建了雷達實驗系統(tǒng)。實驗表明，基于TDC-GP2測相單元的測相精度達(2.7110-4)，并在2.4 GHz載波、150 kHz調制信號的條件下，對3.0～4.1 m內目標的測距實驗證明了系統(tǒng)具有1000 m大范圍測距的可行性，且目標處于3.0 m時測距精度為0.0187 m，系統(tǒng)單次平均測距時間為0.02～0.03 s。Abstract: In order to meet the needs of high speed and real-time, all-weather, high-precision and large-scale ranging, the method of continuous microwave radar with amplitude modulation is proposed. Based on the analysis of the characteristics of the main microwave radar ranging methods, the mathematical relationships among the modulation frequency, measurement range and its accuracy are deeply discussed in the method, in which the low single frequency signal modulated on high frequency carrier signal is adopted to get large-scale ranging and also the time-measurement technology with high precision is used to achieve high precision and high speed ranging. Finally, the experimental radar system is set up by the mixer and the time-measurement chip TDC-GP2 etc. The experiments of the phase difference measurement unit based on TDC-GP2 show its accuracy is2.7110-4degrees. When the frequency of carrier signal is 2.4 GHz and that of modulation signal is 150 kHz, the experimental results under the distance from 3.0～4.1 m verify the effectiveness that the radar system could achieve large-scale ranging of 1000 m, and show that the ranging accuracy is 0.0187 m of distance of 3.0 m. Moreover, the average ranging time for single measuring point is about 0.02～0.03 s.
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Key words:
- Microwave radar /
- Ranging /
- Phase measurement /
- Time measurement technology /
- Amplitude modulation
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