| 摘要 |
PURPOSE:To compensate the Doppler effect through a simple constitution with excellent performance, by devising a countermeasure to Doppler effect only by a fixed body in a two-way communication system between the fixed body and a moving body such as a space or underwater sailing body, to eliminate a load on the moving body. CONSTITUTION:In the moving body communication system, a Doppler shift frequency of a communication wave due to the motion of the moving body 1 is detected on a fixed body side 4 or corresponding side and multiplied by the value obtained by dividing the transmission frequency of the moving body 1 by its specific frequency and the frequency obtained by subtracting the multiplied wave frequency from the specific frequency is transmitted to the moving body 1, so that the specific frequency is received on the side of the moving body 1 without devising any countermeasure to a Doppler shift. The transmit signal of the fixed body 4 after the influence of the Doppler effect is compensated is inputted to the moving body 1. Consequently, the need for compensation on the moving body side to the influence of the Doppler effect is eliminated completely and the communication system for a space or underwater sailing body wherein the restrictions on devices and operators are extremely sever is realized through the simple constitution with excellent performance. |
