Long term monitoring of horizontal subject radar exposed to objects with large external temperature difference changes - installed in open wilderness, direct sunlight and sudden temperature change. How to ensure the accuracy and reliability of radar base level, it is necessary to continuously monitor the level of radar base for a long time. Each high-precision equipment is sensitive to temperature changes. The sudden change of temperature will affect the precision measurement, destroy and block the measurement process. The measurement task is to accurately and continuously monitor the level of the radar base and monitor the level of objects exposed to large changes in external temperature difference for a long time. The solution is to control the temperature change range. The working environment of the sensor should be carried out under the temperature control system. 1) the sensor itself is calibrated at 20 ° C. when the ambient temperature of the sensor is higher than 20 ℃, it will start automatically Dynamic cooling system: when the working ambient temperature of the sensor is lower than 20 ℃, the automatic start-up heating system 2) the sensor can be calibrated by special temperature in the laboratory before leaving the factory in the following two ways. If the working temperature of the sensor is constant at 50 ℃, the sensor will accept the temperature curve calibration of 50 ° C before leaving the factory. The sensor placement environment has the following functions, That is, the impact of the sudden temperature change received by the environment on the sensor is slow and evenly distributed to the whole sensor

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