SU777608A1 - Device for checking balance-type phase-responsive detector of doppler velocity sensor - Google Patents

Description

is cast into the first stable position corresponding to the value of "fit.

Then the signal from the second arm of the balanced phase-sensitive detector of the Doppler speed sensor is fed through the switching device 3 to the first input of the comparator 6. The previously set reference signal level from source 2 is fed through the switching device 3 to the input of the divider 4, set so that the difference between the input and output levels signal equal to the required imbalance. From the output of divider 4, the signal is applied to the second input of comparator 6.

If the signal level from the second arm of the balanced detector I supplied to the first input of the comparator 6 is equal to or less than the signal level from the divider 4 to the second input 2 of the comparator 6, then from the output of the comparator 6 to the input of the circuit with two stable states and sets it to the second stable position corresponding to the value “unfit.

If the signal level from the second shoulder of the balanced detector of the Doppler speed sensor applied to the first input of the comparator 5 is higher than the signal from the divider 4 to the second input of the comparator 6, then the signal from the output of the comparator 6 does not come to the circuit input with two stable states and it remains in the first stable position corresponding to the value of "fit."

To determine the upper limit of the signal from the second arm of the balanced detector 1, the signal is fed through the switching device 3 to the input of the divider 4, from which the signal is fed to the second input of the comparator 6. The first input of the comparator 6 is supplied with the reference signal level from the source 2 through the switching device 3 .

If the level of the signal from the second arm of the ba, lance detector 1 fed through LT, coil 4 to the second input of the comparator 6, is equal to or greater than the level of the reference signal supplied from the source of the reference signal level to the first input of the comparator 6, then from the output of the comparator 6 to the input circuits with two stable states

the signal comes and sets it to the second stable position corresponding to the value “not suitable.

If the signal level from the second arm of the balanced detector 1, supplied through

the divider 4 to the second input of the comparator 6, less than the level of the reference signal supplied from the source 2 to the first input of the comparator 6, then from the output of the comparator 6 to the input of the circuit with two stable states, the signal does not enter, and it remains in the first stable position corresponding to the value of "fit. This completes the unbalance check.

The use of the device makes it possible to shorten the time for checking the unbalance of the phase sensitivity: a foot detector.

Claims (1)

Invention Formula A device for monitoring a balanced phase-sensitive detector of a Doppler velocity sensor, containing comparators whose outputs are connected to a circuit with two stable states, and a source of a reference signal level, characterized in that, in order to improve the performance of the device by reducing the monitoring time, introduced a divider and switching device, with the first input the first comparator is connected to one shoulder of the controlled balanced detector, and the output of the source of the reference signal level is connected to a switching device, to which the second shoulder of the balanced detector, the second input of the first comparator, the first input of the second comparator and the input of the divider are also connected, the output of which is connected to the second input of the second comparator. Information sources, taken into account during the examination 1. Patent of Germany No. 2364186, cl. G 01 R 19/16, 1976.