| 摘要 |
<p>This invention relates to a diplexed multi-frequency CW radar for use in the measurement of range and relative velocities between two vehicles. The radiated signal is modulated so that several frequencies are transmitted on a time-sharing basis. Doppler signals resulting from the reception of energy reflected from a target are gated to produce two composite doppler signals. Range to the target is proportional to the phase angle between the composite doppler tones and range rate is proportional to the frequency of the composite signal. The composite doppler signal can be represented as the vectorial summation of two component signals. The phase relationship between the two composite signals establishes range for all target ranges. However, the composite vectors are reduced to zero at a preselected maximum range and become ambiguous beyond that range. This provides range cut-off for the system. Ambiguous signals existing because of reflections from targets beyond the maximum range are below the threshold level of the system, and therefore, are of no consequence to the system.</p> |
