This paper introduces a method for the artillery location radar to detect the low Doppler velocity target by using a special filter and CFAR process to obtain a detecting threshold, which can improve the detecting capability of the radar.

Since there is a Doppler frequency shift exists in ground object background clutter,the spectrum is spread,the frequency domain difference between the target and the clutter is small so as to increase difficulty to detect the low-velocity targets.

The use of the radial velocity to improve the performance of target tracking;

The radial velocity of flow field in hydrocyclones has great influence on the particle radial movement, which decides the degree of resisting particle radial movement and the diameter of the minimum particles the hydrcyclone can separates.

Results show that the distribution of radial velocity of wide spaced two jet and four jet impinging streams has relation to d/L , the maximum radial velocity has relation to u 0 d/L , and the radial distance of the position of the maximum radial velocity is directly proportional to L .