| 摘要 |
<p>A sensing system, for example a target sensor for a missile, comprises a radar transmitter in which the transmitter and transmitting antenna are operable to receive the radar return signal and to form in the transmitter an information bearing signal by the combination of transmitted and return signals, the radar receiver apparatus being operable to extract the combined signal from the transmitter. The transmitter can be a Gunn effect or Impatt type of device of which the non-linear impedance characteristic ensures generation of the required combined signal at a bias port of the transmitter. By extracting and making use of this combined signal, the overall system particularly its IF circuitry can be simplified. In effect, the transmitter becomes a common mixer for both the transmitter and receiver.</p> |
