Abstract: A radar apparatus which employs a pulse train containing an alternating sequence of first and second groups of pulses. The first group comprises a plurality of identical long pulses and the second group comprises a plurality of identical short pulses. The receiver has a single channel, the processing in which is successively adapted for the pulse returns of a group at any one time.

Abstract: A pulse radar apparatus is provided with a coherent transmitting and receiving unit (1) for the transmission of radar pulses, the reception of echo signals, and the conversion of the echo signals into signals of an intermediate frequency f.sub.if, which may be shifted through a Doppler frequency f.sub.d. The echo signals with frequency f.sub.if +f.sub.d are fed to a detector (7) for the coherent phase detection with a frequency f.sub.if +f.sub.c. The detected signals are fed to an analog-to-digital converter (10), which operates at a frequency of approximately 4f.sub.c. The pulse radar apparatus further includes accumulators (12, 13), alternately fed with the output signals of the analog-to-digital converter (10) each time for a given period, after which period the output signals of the accumulators (12, 13) are representative of the orthogonally detected components of the echo signals.