| 摘要 |
<p>PURPOSE:To enable outputting of a fixed amount of received signal data regardless of variations in off-nadir angle at all times, by selecting an observation area for a distance-wise received signal according to a command signal from the ground. CONSTITUTION:A frequency generating section 1 generates a frequency signal (a) and a reference signal (f) and a chirp pulse generating section 2 inputs the signal (a) to generate a chirp pulse signal (b) and a synchronous signal (c). A transmitting section 3 amplifies the signal (b) up to a specified level and outputs a transmission signal (k) to an antenna section 5. On the other hand, a receiving section 6 amplifies a received signal (d) supplied through an isolator 4 from the antenna section 5 up to a specified level to output a video signal (e). Then, a signal processing section 7 has a function that the signals (c), (e) and (f) are inputted to hold the amount of the received data at a preset fixed value by a command signal (h) from the ground. This enables always maintaining of the received data constant by varying the contents of the signal (h) even when the off-nadir angle changes between the immediate downward way of a flying object and the direction of the center of an antenna beam.</p> |
