Measure distance of moving objects

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to measure distance with radar we need modulation.

Transmitting on two frequencies allows us to measure the phase of a moving object.

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It is a low cost range measurement and can support multiple target processing.

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We call this FSK ranging (frequency shift keying) because we are switching between two different transmit frequencies.

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Combining multiple receive antennas we can track the object over range and angle.

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Measure distance of static objects

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measuring static objects requires a continuous modulation of the transmit frequency. We call it FMCW processing (frequency modulated continuous wave)

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Digital signal processing extracts the targets from the analog radar signals.

A controller with DSP functions is needed.

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To get low error measurements the requirements on the analog hardware are more demanding than for CW or FSK sensors.

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