采取有效措施，测长仪能在恶劣的现场条件下可靠地工作。
By taking effective measures, this instrument can work reliably in bad field working conditions.
该文提出了在GPS检定工作中，不同型号测地型GPS接收机可以进行联合检测、联合数据处理的方法，这在GPS检定工作和测量工作中具有重要意义。
In this article the way of combined testing of different type surveying GPS Receivers and combined data-processing is put forward, which is significant in the GPS verification and surveying work.
详细地描述了它的主要部份——驱动装置，测角装置、红外光度计的工作原理和电路特点。
Its major parts-the operating principle and circuit feature of drivers, the equipment for measurement of telescope position and infrared photometer are introduced.
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