微型机与应用
微型機與應用
미형궤여응용
MICROCOMPUTER & ITS APPLICATIONS
2012年
17期
25-27
,共3页
超声波测距%FPGA%温度补偿%DS18820%回波识别
超聲波測距%FPGA%溫度補償%DS18820%迴波識彆
초성파측거%FPGA%온도보상%DS18820%회파식별
ultrasonic distance measurement%FPGA%temperature compensation%DS18B20%echo identification
设计了一种基于FPGA的超声波测距模块。在时序和信号处理方面，采用CycloneII系列EP2C5T144C8芯片，通过设计时序发生器、高速计数、回波识别和可变门槛控制等逻辑电路模块可快速有序地对信号进行处理。在声速方面，加入了温度补偿模块，避免使用固定的声速值所引入的偏差，从而提高系统精度。该系统具有可靠性高、集成度高和响应速度快等特点，实验表明，在距障碍物600mm～3600mm时，相对误差在0．3％以内，测量精度得到很大提高。
設計瞭一種基于FPGA的超聲波測距模塊。在時序和信號處理方麵，採用CycloneII繫列EP2C5T144C8芯片，通過設計時序髮生器、高速計數、迴波識彆和可變門檻控製等邏輯電路模塊可快速有序地對信號進行處理。在聲速方麵，加入瞭溫度補償模塊，避免使用固定的聲速值所引入的偏差，從而提高繫統精度。該繫統具有可靠性高、集成度高和響應速度快等特點，實驗錶明，在距障礙物600mm～3600mm時，相對誤差在0．3％以內，測量精度得到很大提高。
설계료일충기우FPGA적초성파측거모괴。재시서화신호처리방면，채용CycloneII계렬EP2C5T144C8심편，통과설계시서발생기、고속계수、회파식별화가변문함공제등라집전로모괴가쾌속유서지대신호진행처리。재성속방면，가입료온도보상모괴，피면사용고정적성속치소인입적편차，종이제고계통정도。해계통구유가고성고、집성도고화향응속도쾌등특점，실험표명，재거장애물600mm～3600mm시，상대오차재0．3％이내，측량정도득도흔대제고。
This paper designes an FPGA-based high-precision ultrasonic ranging module. For chip timing and signal processing, the Cyclone II series EP2C5T144C8 is used to design logic circuit module such as timing generator, high-speed counting, echo identification, variable threshold control, which can process signal quickly and orderly. In the speed of sound, it adds temperature compensation module to avoid the bias values which are introduced by the use of the fixed velocity, thereby improving the system accuracy. The system has high reliability, high integration and fast response characteristics. Experiments show that the relative error is less than 0.3% away from the obstacle 600 mm to 3 600 ram, the measurement accuracy is greatly improved.
