| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a helicopter-mounted reception device which is immune to transmission interference by making decoding possible even if a signal of a frame that does not suffer from rotor interference, is deteriorated.SOLUTION: An interference property caused by disturbance of ambient variation upon a reception signal on which phase shift modulation has been performed, and equalization that is modulation error correction for a rotation term of rotary blades, an interference period and the interference property are learnt by transmitting a preamble signal during a conventional dummy period that is longer than the rotation term of the rotary blades. The reception signal is equalized into which a low-speed data signal is iteratively inserted into a first half of a preceding frame and a second half of a following frame. From the reception signal of the preceding frame, the reception signal of the following frame and a reception signal resulting from combining the reception signal of the preceding frame and the reception signal of the following frame in a maximum ratio, a reception signal in an excellent reception state is selected for each symbol for a modulation error correction unit, for each word of a unit of error correction using a parity bit or for each packet of a unit of error correction using a parity word. The selected reception signals are demodulated, combined and error-corrected, thereby outputting the low-speed data signal.</p> |
