Synthetic aperture radar equipment based on use of rotary antennae - overcomes range ambiguity by transmission of pulses having distinguishable characteristic in repetitive sequence

摘要

The radar equipment correlates (11) a received signal with reference functions generated (13) and stored in memory (12). A quadrature demodulator (8) of the IF signal delivers outputs in phase and quadrature for digitisation (9) and buffer storage (10). The correlator is clocked (6) for each individual range interval in common with a ring counter (5) which sets the periodicity of pulse transmission in sequences with progressively increased frequency or varied pulse shape (e.g. pseudo-noise encoded signal design). ADVANTAGE - Unambiguously distinguishable response signals can be received and processed even at long ranges with aid of different characteristics of successive pulses.