| 摘要 |
<p>PURPOSE:To make discovery by an enemy hard to occur, by performing a transmitted wave spectrum diffusion to minimize a transmitting power density per unit frequency band. CONSTITUTION:As for a downward direction of a flying object, an output of an oscillator 1 undergoes a spectrum diffusive modulation by an output of a first 1-bit delay circuit 22 in which an output of a first spectrum diffusion code generator is delayed by 1 bit to be transmitted at a first antenna 4a. As for an upward direction thereof, the output of the oscillator 1 undergoes a spectrum diffusive modulation by an output of a third 1-bit delay circuit in which an output of a second spectrum diffusion code generator is delayed by 1 bit to be transmitted at a second antenna 4b. Signals reflected of these signals from a target are received with third and fourth antennas 4c and 4d to be synthesized with a synthesizer. Then, the signals are mixed with a part of an output of the oscillator 1, thereby achieving a homodyne detection.</p> |
