Abstract: A pulse compression control system uses a code sequence having a larger self correlation side lobe level compared with an ideal code sequence as a transmission code sequence and includes a modulating unit for modulating a pulse by the transmission code sequence in a first order modulation unit. The pulse is received in a demodulating unit where it is demodulated. A reception code sequence from the demodulation unit is modulated by a key code sequence in a second order modulation unit so as to convert it to the ideal code sequence. A self correlation processing unit processes the ideal code sequence for pulse compression.

Abstract: A method and apparatus for estimating the trajectory of a projectile using two interferometric radar antennas each producing a group of interferometric antenna lobes forming intersecting solid angles, and being directed at an elevation angle so that the projectile passes through each interferometric antenna lobe. Each radar antenna transmits a different frequency of pulsed RF power and receives pulsed RF signals reflected from the projectile whenever the projectile passes through the antenna lobes of the radar antennas. Based on the received signals of respective radar antennas, the range and time information for the projectile passing through the antenna lobes of the respective radar antennas can be obtained. From this range and time information, the three-dimensional coordinates, speed and acceleration at the points in the antenna lobes through which the projectile passes can be obtained.