SMALL AND LOW POWER CONSUMPTION SHORT PULSE RADAR HAVING TIME LAG BETWEEN TRANSMISSION AND RECEPTION ARBITRARILY VARIABLE WITH HIGH TIME RESOLUTION AND ITS CONTROL METHOD

摘要

A short pulse radar and its control method wherein the first level transition timing of a variable period pulse outputted from a variable period pulse generator including a direct digital synthesizer (DDS) after receiving an instruction of search is employed as a reference timing, a signal making a level transition at the reference timing or after a fixed time lag from the reference timing is generated and outputted as a transmission trigger signal, and a signal making a level transition with a time lag equal to a half of the period of the variable period pulse or an integral multiple of the period from the output timing of the transmission trigger signal is generated and outputted as a reception trigger signal. Time lag between the transmission trigger signal and the reception trigger signal can be made variable by previously making the frequency data of the DDS variable depending on the relation between the frequency data stored in a memory and the time lag between transmission and reception. Consequently, the time lag between transmission and reception can be made variable arbitrarily with high time resolution and low power consumption through a simple arrangement.