The High Accuracy Clock Source Adopts In The Synchronous Data Concentrated Of Application

The ocean homework of the electromagnetism probe into the bottom of the sea, sink several instruments to different points follow the measure line of the sea surface. Every instrument works lonely by the procedure which have set. In addition, set out the far reference stand in the land or island far from the measure area, collect data with the instrument of the bottom of sea synchronously. About measuring in land, install GPS antenna for every instrument, the lord controls unit of the instrument receive the clock signal of satellite at any time and adjust the internal clock consistent with the satellite clock, in order to let every instrument consistent with each other in the acquisition time. But the measuring in the sea, the huge thick sea water layer has to shield a function to the GPS signal, the instrument of bottom of sea can't receive the GPS signal which the satellite send out. Therefore, the instrument only have one chance to aim at the clock with GPS, then while account by itself after descend the sea.The problem of the High accuracy clock electric circuit is the stability of the crystal flap, but he stability mainly under the influence of environment temperature. The crystal flap under the condition of the changing temperature, the frequency will immediately change and result in error. On the sea homework, the deck temperature is sometimes up to 40 degrees above, instrument just drive throw in the sea, temperature of the sea surface about more than ten degree, but in the bottom of sea, water temperature only 3℃, it is thus clear that, if have no repair measure, the accuracy of the system clock is hard and assuring. One of the method which controls temperature is to place crystal at the constant temperature slot inside. The instrument adopted to take to repair of crystal flap a technique.