The Doppler frequency can be obtained as a heterodyne or beat effect.由于外差或频差效应,能够得到多普勒频率.That's a heterodyne receiver.那是外差式接收机.Function test and calibration self - heterodyne curve for direction finder on sea trial....
Exxon Mobil Corp. is betting big on China's seemingly endless hunger for fuel.埃克森美孚(ExxonMobil)正对中国似乎永无休止的对燃料的渴求押下重注.Primarily using the Lonworks technology of Echelon corp. and WEB technology of ASP, XML, SQL and.主...