Radar system with continuous wave frequency modulated transmission

摘要

A radar ranging system using a continuous wave frequency modulated transmission characteristic for the measurement of aircraft altitude or inter-vehicular distances in traffic employs a voltage regulated oscillator (15) which transmits a linear sweep frequency beam conforming to the cyclic frequency/time pattern of Figure 2 via an antenna (10). Target echoes are received by the same antenna via the synchronised switch (11) and by registering frequency differences related to the time of signal travel at the frequency counter (22) of a quartz (25) regulated controller (20) the range is derived. The method is inherently independent of drift caused by ageing or temperature and has a self-monitoring feature for stabilising the frequency/time sweep pattern.