SU951214A2 - Device for measuring time position of a pulse - Google Patents

Description

The invention relates to radio engineering, can be used; al synchronization of signals using radio engineering means.

According to the main auth. No. 576553, a device for measuring a pulse temporal position, comprising a series-connected band-pass filter, a notch filter, a reference point generating unit and a recorder connected in series by a signal parameter error sign analyzer, a drive and a switch, with the signal analyzer sign analyzer input connected to the output unit reference point, the switch output is connected to the control input of the reference point generation unit, and the control inputs alizatora sign skew parameter signal and the switch are connected to corresponding outputs 1 registrar.

However, the known device has insufficient accuracy over a wide range of input level variations.

The purpose of the invention is to improve the accuracy in a wide range of "level of input signals.

The goal is achieved by the fact that a first attenuator and a first switch connected to the input of a band-pass filter, a second attenuator connected in series, a second switch, a third attenuator and a third switch are connected in series to a well-known device for measuring the temporal position of the pulse.

10 connected between the output of the notch filter and the input of the forming point forming unit, the second input of each switch is connected to the input of the corresponding attenuator, the signal parameter error level analyzer including the series-connected sampling unit, the accumulator and the comparator unit are entered to the second input

20 of which is connected to the output of the source of reference voltages, the storage unit and the decision unit, the analyzer input level of the signal parameter mismatch is connected to the output of the 25 filter notch, and the outputs are connected to the control inputs of the second and third switches and the decision block memory entry

30 blocks, the second output is from the control INPUT of the first switchboard, the call to the remembering block is connected to the third input of the decision block, and one of the recorder outputs is connected to the control input of the level analyzer: error, signal parameters and the second memory input. block. The drawing shows the cTpyscxyp electrical circuit of the proposed device. The device contains a band-pass filter 1, a notch filter 2, a reference point forming unit 3, a recorder 4, an analyzer 5 x1 1k of the signal parameter mismatch, a drive 6, a switch 7, a first attenuator 8, a first co. 9, a second attenuator 10, the second switch 11, the third attenuator 12, the third when the memory block 14, the decisive block 15 and aka.peduagor 16 level of signal parameters mismatch, including the accumulator 17, the sampling block 18, the comparator block G9 and the source 20 reference stresses. The device operates as follows. A mixture of signals and interference is fed through the normally closed contacts of the controller 9 to the device input. Next, the interference is filtered in the band 1 and notch filters 2. From the output of the notch filter 2, signals are sent to the analyzer 16 for calculating the signal parameters, which is the simplest; -. In the case of a model, the sample of the sampling unit 18 is controlled by the control unit. My gateway is kmpulsag / w from pe1: str..g ;; ra 4, naprmer, at the time of the positive half-wave signal,: - opitel 17 and block 19 comparato ;;: s with a source of 20 onopiirax strain. The received selections are sent to the accumulator 17, which is made com- municable by the same strobe pulses from the arrival of signals from the corresponding station. The entire dynamic / dynamic DX1 band of input signals is divided into N levels, the number of which is determined by the path gain and linearity of the band 1 and notch 2 filters, as well as the unit 3 of the formation of a reference point. In reality, the range of 120 dB is enough to develop by three UOVN. for example, O - 60 dB 60 90 dB 90 - 12C dB. If the value of the signal at the input of the device exceeds the first level, then the commands to the switches 9, 11 13 are not received and the attenuators 8, 10 and 12 are disconnected. The logical decision unit 15 fixes the code state as follows: .. attL att.2 att. With an increase in the amplitude of the signal from any station of the first level, the comparators block 19 receives a command to the switch 13, which switches on the third attenuator 12 between the notch filter 2 and the block 3 to form the reference point for the signal time of this station. The logic of resolving the block 15 at the same time fixes the state of at. 1 at. 2 at. 3 OO1. If the signal exceeds the second level, the comparators receive a command to the switch 11, which turns on the second attenuator 10 between the notch filter and the reference point forming unit 3. In this case, the logical decision block 15 receives a logical command at the input of the operational storage unit 14 and the logical unit for that station whose signal exceeds the second level is recorded in its memory, and the choice of the station is determined by the fact that the second input of the operational storage unit The identification gates are supplied for the duration of the signals from this station. From the entry point of the operational memory of its block 14, the fixed logical unit enters the logical decision block 15 ,. fixing its state a gt, 1 att.2 att. 3 111 In this case, from its output, a command is sent to the switch 9, including the first attenuator 8 at the output of the device. Subsequently, as the signal is removed from the station and decreases below the third level, the state of the att, 1 at.2, att.3 101 and the second attenuator is turned off is fixed in the logic solver block. The first and the third remain on. Finally, when the amplitude of the signal is below the second level, there are no commands at the output of block 19 of the comparators, the logical decider 15 closes the operational memory of block 14 and records the state att.1 at.2 att.3000 shutting down the caNtJM first attenuator 8. Thus, the device allows you to quickly monitor the level of the input signal of each station and to ensure the linearity of the path throughout its dynamic range.

This makes it possible to eliminate the possibility of occurrence or drastically reduce the accuracy of its correction and, consequently, the accuracy of the measurement of time intervals.

Quantitative estimates are obtained for commonly encountered nonlinear distortions, expressed when a cathode ray tube is observed on the screen to show that the input signal envelopes differ in positive and negative ordinates. In this case, we can assume that a certain e is applied to the input of the reference point forming unit 3 (t), unequal to zero, for example, only for positive values of e (t). However, if

  en (t) s (t). sin), where S (t) is an envelope, then vn (t) 0.5 En (t) Cl-s ign l (t) sin (u)) here E (t) is slowly varying within the leading edge function

The output voltage of the unit for forming the reference point now, in addition to the useful component, also contains a unipolar pulsation caused by non-linearity with a period of To 0.5T, where T is the high frequency period of the signal, which is Uy, (t) ln (tT) + kl (t). In the absence of non-linearities, the amplitudes of the half-waves of the generated signal are equal. If the value of Ef is only 1% of the ordinate, then the temporal position of the reference point is 2Tv, which for a frequency of 100 kHz is 2 µs or corresponds to a decrease in the reliability of elimination of ambiguity. Approximately CO, 99 to O, 92.

The introduction of an automatic adjustment of the signal level reduces the nonlinearity to 0.1%, which leads to a decrease in the time departure of the reference point 2 s to 0.2 MCS.

Claims (1)

1. USSR author's certificate number 576553, cl. G 01 S 3/10, 1976 (prototype).