| 摘要 |
<p>PURPOSE:To suppress the influence due to multipulse and to improve height measurement precision by finding the mean value of received signals against transmitting pulse signals with specific different frequencies, estimating direct waves, and making a measurement of height. CONSTITUTION:Route length difference DELTAR between indirect and direct waves are found from the range between a target and a radar obtained from a range finder in a target tracking state, and two transmission frequencies which satisfy the frequency difference DELTAf shown by an equation are set. A transmitter outputs transmit pulse signals of those two transmitting frequencies successively. Received power signals P1 and P2 as corresponding reflected signals are composed of indirect waves fI1 and FI2, and direct waves fD1 and fD2 on vector basis, so they are averaged to estimate the power of the direct waves fD1 and fD2; and the elevation to the direct waves are found and the height is measured from the elevation and range information.</p> |
