GPS测试仪，主要完成方位定位，经纬度，海拔，速度，时间-Positioning GPS tester to complete orientation, latitude, longitude, altitude, speed, time

实现一个科学计算器功能，并有帮助说明- order to maximize the sensitivity of the whole sensor, the resistance of the impedance-loaded sensor was adjusted to match the output impedance of the SAW interdigital transducer (IDT) by changing the resistivity of the Sb-dop