Importance

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Abstract

A moving doppler radar unit capable of separating the incoming doppler signal into its respective frequency components by means of frequency translation techniques and fixed frequency filters is disclosed. When the radar platform vehicle and target vehicle are both moving, the received doppler signal is a complex wave having frequency components related to the ground speed of the platform vehicle and the relative speed of the platform and target vehicles with respect to each other. Separation of the received doppler signal into its respective frequency components is accomplished by frequency translating the received doppler signal to a preselected reference frequency, discriminating between the frequency translated platform speed and target speed frequency components by means of a narrow band filter and a band pass filter, and frequency translating the separated frequency components downward to provide speed signals representative of the ground speed of the radar platform vehicle and the ground speed of the target vehicle. These speed signals are then converted into digital speed information which can be conventionally displayed. A lock detection circuit is included to inhibit the speed computation if the received doppler signal is not properly frequency translated to the reference frequency.

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First Claim