SU1001457A1 - Pulse disriminator - Google Patents

Description

(54) TEMPORARY DISCRIMINATOR

The invention relates to a pulse technique and can be used in tracking systems for determining the temporal position of a pulse front, for example in range finders.

Devices are known that can measure the temporal position of a pulse front using a temporal discriminator comprising keys, detectors, a SENT device, and half-cube generators. The input pulse is predifferentiated 1.

The main disadvantage of this device is that when processing the input pulse in the presence of broadband noise, differentiation leads to a sharp increase in the high-frequency components of noise, and this entails an increase in the variance of the measurement error and reduces the accuracy of the time discriminator.

The closest to the proposed technical essence and the achieved result is a temporary discriminator containing a subtractive device, the output of which is connected to the output bus of the device, and the first and second inputs are connected to the series-connected, respectively

the first and second detectors and keys, the first inputs of which are connected to the input bus of the device, and the second inputs are connected to the outputs of the first and second strobe generators, respectively, the output of the first of which is connected to the input of the second, and the input to the start bus of the device 2.

This device allows the output signal to be output, the value of which is proportional to the mismatch between the center of the electrical pulse and the center of the two strobes (reference pulses). However, the introduction of a single15 or double differentiation to measure the temporal position of the front of the input pulse leads to the fact that such a time discriminator has a low accuracy.

20

The purpose of the invention is to improve the accuracy of the device, namely, to increase the accuracy in measuring the temporal deviation of the front of the input pulse relative to the gate pulses.

25

The goal is achieved by the fact that in a temporary discriminator containing a subtractive device, the output of which is connected to the output bus of the device, and the first and second

Claims (2)

30 inputs are connected to the outputs of the first and second detector respectively, the input of the first of which is connected to the output of the first switch, the first input of which is connected to the first input of the second key and the input bus of the device, and the second inputs of the first and second keys are connected to the outputs of the first and second gate drivers, respectively the input of the second generator of the gate is connected to the output of the first generator of the gate, the input (which is connected to the device startup bus, a third generator of the gate is inputted, the input of which is connected to the output of the device The strobe generator is output, and the output is connected to the output of the first strobe generator, and an amplifier whose input is connected to the output of the second key, and the electric drive is connected to the input of the second detector, and the duration of the strobe of the third strobe generator is equal to the duration of the strobe of the first strobe generator, and the coefficient The amplifier transfer factor is set equal to twice the ratio of the gate durations of the first and second gate generators. FIG. 1. shows the structural scheme of the temporary discriminator; in fig. 2 - time diagrams / those that show his work. The device contains the first and second keys 1 and 2 / the first and second generators 3 and 4 of the gate, the first and second detectors 5 and 6, the third generator 7. Gates, amplifier 8, subtractive device 9, input and output 10 and 11 tires and bus 12 launch. The device works as follows. After each pulse arriving at bus 12, generator 3, 4, and 7J, pulses 13, 14, and 15 are formed (Fig. 2a), the duration of which is, respectively, T, and TV ,. If the input pulse 16 arriving at bus 10 is shifted from right to left on the time axis At, i.e. If the input pulse is differently misaligned relative to the pulse center 14, then at the outputs of the detectors 5 and 6, the voltage will change as indicated in FIG. 26 and 2c, respectively {in this case, generators with a reset are considered as detectors). The output voltage on bus 11 will vary, as indicated in FIG. 2g. If you perform the tr tr- relations and set the gain of the amplifier to 8 K 2 7;:, / T r t, the zero of the discriminating characteristic (Fig. 2d) will coincide with the im- center. pulse 14 generator 4 gate. Thus, the time discriminator in a certain range (the duration of the input pulse must be greater than the sum of the durations of the gate pulses) produces a voltage whose magnitude and sign are proportional to the magnitude and sign of the mismatch of the front of the input pulse relative to the center of the second pulse of the gate. To avoid restarting the second pulse generator from the output of the third strobe generator, it is necessary that the recovery time of the half-grid generators is commensurate with the pulse following period; For the same purpose, an OR element can be used in the second input circuit of the first key. The proposed device allows to increase the accuracy of the measurement of the error between the gates and the front of the input pulse by eliminating the need for its preliminary differentiation, which increases the intensity of broadband noise. The zero position of the time discriminator does not depend on the amplitude of the input pulse. The symmetric discriminatory characteristic makes it possible to get rid of the device zero imbalance in terms of noise. This device can also be used when working with a given front (decay) of the input pulse. Claims of the Invention A time discriminator containing a subtractive device whose output is connected to the output needle of the device, and the first and second inputs are connected to the outputs of the first and second detectors, respectively, the input of the first of which is connected to the output of the first key, the first input of which is connected to the first input of the second key and with the input bus of the device, and the second inputs of the first and second keys are connected to the outputs of the first and second gate generators, respectively, and the input of the second gate generator is connected to the output of the first strobe generator, the input of which is connected to the device startup bus, characterized in that, in order to improve accuracy, a third strobe generator is introduced into it, the input of which is connected to the output of the second generator, and the output is connected to the output of the first generator of the strobe, and the input of which is connected to the output of the second key, and the output is connected to the input of the second detector, the gate duration of the third gate generator being chosen equal to the gate duration of the first gate generator, and the transmission coefficient y ilitel set equal to twice the ratio of the durations of the first and second Gates strobe generators. Sources of information taken into account in the examination 1. Barton D. Radar sietemy. Per. from English, edited by KNN.Trofimova. N., Voenizdat, 1967, p. 372. 2. Pervachev S.V. et al. Statistical dynamics of radio engineering research systems. M., Sov. radio, 1973, p. 24 (prototype). af 0l fug. I