根据体效应振荡器的变负载检波特性,提出了一种新体制的微波自差机——偏压自激微波脉冲自差机.其特点是振荡器为脉冲微波振荡,其偏压处于自激振荡状态,整机探测距离较大,且具有良好的抗干扰性能。文章较详细地分析了利用体效应振荡器的静态负微分电导产生偏压自激的过程,并讨论了该体制中的多卜勒信号的检测问题。 According to the characteristics of variable-load detection of body-effect oscillator, a new system of self-heating microwave bias device is proposed, which is characterized in that the oscillator is pulsed microwave oscillation whose bias voltage is in the self-excited Oscillation state, the whole detection distance larger, and has good anti-jamming performance. In this paper, the process of generating self-excited bias using static negative differential conductance of bulk effect oscillator is analyzed in detail, and the detection of Doppler signal in this system is discussed.