| 摘要 |
<p>A range detection apparatus comprising means for generating high frequency energy over a finite frequency range and for frequency modulating over a limited range of bandwidth the generated signal. A first path (130) provides a phase reference (132) while a second path (160) provides for transmitting and receiving the signal. Along one of the paths, the frequency modulated signal is phase shifted (130) at a plurality of predetermined frequency values over a finite frequency range of bandwidth and at a predetermined plurality of phase-shifting values and at combinations of phase-shifting and frequency values to improve the relative range resolution. Additionally, a temperature compensated one port Z-network (162) is provided to generate a voltage of equal magnitude and opposite sign so that of the voltage reflected from the antenna (120).</p> |
