其他的室内定位系统尝试通过使用无线电，超声波或者红外信号来给用户定位。
Other indoor positioning systems try to find a user's position using radio, ultrasound or infrared signals.
由于室内无线传播环境的噪声随机性干扰比较大，在设计射频识别室内定位应用系统时，高精度定位算法的研究显得十分重要。
In the design of RFID indoor location system, due to the existence of serious random interference in indoor radio environment, it is very important to have location algorithms with high accuracy.
由于室内无线传播环境的噪声随机性干扰比较大，在设计射频识别室内定位应用系统时，高精度定位算法的研究显得十分重要。
In the design of RFID indoor location system, due to the existence of serious random interference in indoor radio environment, it is very important to have location algorithms with high accuracy.
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