| 摘要 |
<p>An optical space communication apparatus for performing communication by propagating a light signal in a free space, comprising a multiplexing device for multiplexing a first pilot signal with a transmission signal, a first converting device for converting a first electric signal from the multiplexing device into a first light signal, a transmitting optical system for transmitting the first light signal to a party apparatus, a receiving optical system for receiving a second light signal including a second pilot signal, having been transmitted from the party apparatus, a second converting device for converting the second light signal into a second electric signal, a first band-pass filter having a pass region including a frequency of the second pilot signal, a first detecting device for detecting the second electric signal having passed through the first band-pass filter, a second band-pass filter having a pass region not including the frequency of the second pilot signal, a second detecting device for detecting the second electric signal having passed through the second band-pass filter, an adjusting device for adjusting an angle of the receiving optical system, a control device for controlling the adjusting device, and a frequency variable device for making variable a cut-off frequency of a servo system loop filter for the control device, based on signals from the first detecting device and the second detecting device. <IMAGE></p> |
