| 摘要 |
In a pulse radar ranging system, directional coupling means are configured to convey transmit pulses to be transmitted via an antenna to a target and to convey target echoes received by the antenna to a signal mixer that generates an intermediate frequency signal. To embed a reference measurement into the target measurement, the directional coupling means include a four-port circulator with an additional port arranged between a port receiving the transmit pulses and a port coupled to the antenna. A reference line is coupled to the additional port for generating reference echo pulses in response to input pulses. The circulator is configured to split a portion of the transmit pulses to the reference line and to convey there reference echo pulses to the antenna.
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