DEVICE FOR COMPENSATION OF DOPPLER FREQUENCY Russian patent published in 2006 - IPC G01S13/58 

FIELD: radiolocation, possible use in onboard impulse-Doppler radiolocation systems.

SUBSTANCE: device for compensating Doppler frequency, appearing in echo signal as a result of movement of carrier of impulse-Doppler radiolocation station contains first mixer, one of inputs of which is the signal input of the whole device, utilized for connection to output of second supporting heterodyne of radiolocation station. Output of mixer is connected to serially connected first filter, connected to one of inputs of second mixer, second filter and amplifier, output of which is the output of whole device and is one of inputs of phase detector of radiolocation station. In accordance to invention, additionally included are device for generation of controlling voltage, first heterodyne and second heterodyne. Output of first heterodyne is connected to second input of first mixer. output of second heterodyne is connected to second input of second mixer. output of device for generation of control voltage is connected to control input of first heterodyne. Input of device for generation of control voltage is the input of the whole device and is utilized for connection of output ten-byte signal of digital-analog converter. Device for generation of control voltage contains two parallel channels, each one of which consists of serially connected Doppler filter, detector and integrator. Frequency characteristics of Doppler filters are shifted relatively to zero of Doppler frequencies symmetrically for one quarter of repetition frequency. Common input of Doppler filters is the input of device for generation of control voltage. Outputs of channels are connected separately to device for computation of maximal value of signals energy at outputs of Doppler channels and their difference. Is of device are connected separately to appropriate inputs of divider of result of subtraction of aforementioned values by maximal one of these, output of which is connected to input of code-analog transformer, output of which is the output of device for generation of control voltage.

EFFECT: decreased error of Doppler frequency compensation due to selection of Doppler frequency, caused by movement of carrier, from echo-signal, reflected from under-stretched surface.

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