Abstract
For the purpose of measuring the miss distance between a flying body and a target, DOPPLER type MDI (Miss Distance Indicator) is populanly used because of its theoretically high accuracy of measurement and simplicity of the system. However, this system has one drawback in that its accuracy is reduced when the flying body changes its velocity as it passes by near the target.
Possibility of a measuring system free from this drawback while retaining high measunement accuracy of the original system was investigated, which resulted in a system that provides measurement of miss distance by the use of time integration data of DOPPLER frequency only even When the flying body is flying at a fixed acceleration.
The measurement error was also investigated and it was found that operating radiowave length error, DOPPLER frequency integration error, DOPPLER frequency integration time error and other factons responsible for the measurement error are all negligibly small. Numerical calculations conducted to verify feasibility of this measurement system demonstrated that this system has significantly improved measurement accuracy over conventional system and that it can provide accurate miss distance measurement of flying bodies even when they are flying at changing velocity.
