| 摘要 |
PURPOSE:To accurately measure the speed of a high speed object, by calculating the phase difference vector of the receiving signal between continuous transmission pulses and further measuring the difference between the phase differences from two continuous phase difference vectors. CONSTITUTION:A receiving signal is inputted to a demodulator 10 to be demodulated into a real part and an imaginary part. The demodulation signal is inputted to an MTI filter 12 through an A/D converter 11. A delay element 13-1 and a self-correlation device 14-1 operate a phase difference vector and this phase difference vector is inputted to a Doppler frequency operator 18 through a delay element 13-2 to calculate Doppler frequency. The delay element 13-2 and a self-correlation device 14-2 operate the difference vector of phase difference to input the same to a difference Doppler frequency operator 15 to calculate difference Doppler frequency. The output of a difference Doppler frequency operator 15 is added to the output of the Doppler frequency operator 18 or delay element 13-3 give through a change-over device 17 by an adder 16 to calculate Doppler frequency. |
