| 1. | Acoustic position reference system
声定位参照系 |
| 2. | Acoustic positioning system
音响测位装置 |
| 3. | Acoustic position indicator
水声定位仪 |
| 4. | A method has been developed to calibrate the positions of the transducer and the transponder in the ultra - short baseline acoustic position system ( usbl )
摘要提出了超短基线水声定位系统( usbl )的校准方法，并用模拟数据进行了验证。 |
| 5. | Acoustic positioning system has wide application in ocean scientific field . however , existing systems have disadvantages of bulkiness , perplexing operation , limited position range and low precision , resulting in their incompetence of satisfying many application needs
水声定位系统在海洋科学领域应用广泛，但原有系统大多或设备庞大、操作复杂，或定位范围小、精度低，很难真正下满足使用需求。 |
| 6. | Active underwater acoustic positioning / tracking systems locate target by measuring the range from object to receiving sensors . usually the target - receiver range can be got by the propagating time of a signal pulse . if this propagating time is larger than the pulse repetition period , it will mean that more than one signal pulse are on propagation
主动水声跟踪定位系统通过测量脉冲信号的传播时延可以测得目标相对接收机的距离，当此传播时延大于系统同步周期时，时延测量就会呈现不确定性，可能相差若干个重复周期，导致定位解多值，称之距离模糊现象。 |
