A reflecting laser velocimetry for measuring the projectile velocity is designed.

In this article, we use the approximate formula abtained to analyze the relation of projectile velocity with obliquity of trajectory during a section of time after the trajectory top quantitatively.

According to the limitation of traditional method for measuring projectile velocity,this paper proposes a new technology for measuring projectile velocity which is combined with digital laser screen and a cross-correlation velocity measurement algorithm.

Study of bullet velocity measurement system at any direction incidence;

The principle of bullet velocity measurement based upon the cross-correlation techniques is demonstrated.

A bullet velocity measuring system is composed of photoelectric target,microchip and PC is in- troduced and its operational principle as well.

Using the documentary datum and comparative method, the author studies some technology factors of Chinese-foreign long jumpers at the absolute speed, run-up speed, rate of the speed usage, take-off ability, etc, and analyses the existing diversity, based of these, the author makes some proposal for solving questions and increasing achievement.

A query algorithm with a high absolute speed costing low I/O based on set theory is given, and a query algorithm of high response speed based on parallel process is presented.

The paper expounds briefly the absolute speed of ru n -up rhythm etc ,and attempts to improve sportsmen s long jump marks.

This paper discusses how the dynamic points and the dynamic reference system are selscted in composite movement and how the relative motion paths influence the computational points absolute velocity and absolute acceleration.

It was found that apart from his absolute velocity obviously lower than his opponents’, Huang Geng s velocity of the last 10m run up was also lower because of the influence of the absolute velocity.