SU769484A2 - Device for measuring time-related position of a pulse - Google Patents

Description

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The invention relates to radio engineering and can be used in receivers of pulsed-phase radio navigation systems.

According to the main author. St. No. 370578, a device for measuring the pulse temporal position is known, comprising a series-connected band-pass filter, a notch filter, a signal measuring point forming circuit and a time position meter, as well as an amplifier-limiter and an amplitude detector, a notch filter connected in addition to the measuring points through series-connected amplifiers j5 limiter, input correction filter and amplitude detector {1.

However, the measurement accuracy of the known device is not sufficient.

The aim of the invention is to increase go measurement accuracy.

For this purpose, the device for measuring the temporal position of the pulse, containing a series-connected bandpass filter, a 25-point signal shaping circuit, a temp-position meter, an amplifier-limiter and an amplitude detector, a notch filter is additionally connected to the counting point formation circuit through a series

a coupled amplifier-limiter, an introduced correction filter and an amplitude detector, are in series connected a delay unit, a pulse shaper and a switch, to the second input of which a bypass element is connected, the output of the commentator is connected to the second input of the notch filter and the output of the time position meter is connected to the input block delay.

The drawing shows a structural electrical circuit of the proposed device for measuring the temporal position of the pulse.

The device for measuring the time position of the pulse contains a band-pass filter 1, a notch filter 2, a signal reference point forming circuit 3, a time position meter 4, an amplifier limiter 5, an amplitude detector 6, a correction filter 7, a delay block 8, a pulse shaper 9, and a switch 10 shunt element 11.

A device for measuring the temporal position of the pulse operates as follows.

At the input of the device from the antenna receives a mixture of useful pulse signals and interference. Out-of-band interference is filtered by .. g / t

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The ground filter 1. Suppression of in-band interference is performed by a notch filter 2, due to which narrowband the signal duration at its output increases. There is an imposition of a falloff of the signal to the leading edge of the next signal in the burst. As a result, the temporal position of the reference point of the signal changes. It receives an offset by the time, which determines the measurement error of the signal's temporal position. After the timing diagrams with the error of the signal temporal position are synchronized in the meter 4, the following gates from the meter 4 arrive at the delay block 8, where the gates are delayed for this time. The delayed gates arrive at the shaper 9, at the output of which pulses are generated, which, acting on the control input of the switch 10, open it, connecting to the notch filter 2 a shunt element AND for the duration of the action of these pulses. In this way, the loop of the notch filter 2 is bridged, its bandwidth is extended and the duration of the transient process is shortened, thereby eliminating the measurement error caused by the inertia of the notch filter 2. The delay time is chosen so that the informative

the part of the leading edge of the pulse was not distorted when it was shunted by gates coming from the imager 9.

In the proposed device for measuring the temporal position of a pulse, the duration of the transient process does not exceed 300-400 MCS. Since the pulse period in a burst is 1000 ISS, the mixing of the reference point is completely absent and the measurement accuracy is improved.

Claims (1)

1. USSR author's certificate №. 3,70578, cl. G 04F 10/00 1971 (prototype).