| 摘要 |
PURPOSE:To eliminate the effect due to the fluctuation of amplitude, phase and frequency of an electromagnetic wave and to enhance ECCM performance by modulating digital information in the direction of polarization of a transmission electromagnetic wave and making communication while distinguishing the digital information depending on the polarization direction. CONSTITUTION:Digital information '1', '0' is modulated in the polarization direction of a transmission electromagnetic wave and the digital information is communicated while being distinguished depending on the polarization direction. For example, a carrier oscillator output is sent to positive, negative circularly polarized wave helical antennas 8, 9 in matching with '1', '0' of the digital data (serial) desired to be sent. On the other band, the signal received by the positive, negative circularly polarized wave helical antennas 47, 48 at the reception side is subjected to AM detection 45, 46 respectively, the level is compared by comparators 47, 48 and demodulated into '1', '0' serial digital data. In this case, since the output of the positive, negative circularly polarized wave helical antennas 41, 42 is inverted ASK output, the error bit is detected by taking the correlation of both. Then digital communication with noise immunity and high ECCM performance is always attained. |
