SU673977A1 - Time interval measuring device - Google Patents

Description

multipath propagation through the ionosphere.

The described device contains a decoding device 1, a fbirover 2 "pulse trains, a distributor 3, L-elements I 4 / L counters 5, p .; Elements K 6 and block 7 registrami, except Toi-o, the device includes a generator 8 reference frequency, divider frequency 9, trigger 10, elements I, li and 12 and input buses 13, 14 and 15.

On the transmitting side there is a sounding signal consisting of three starting combinations, S mediating signals and evil signals: from the current pulse duration of the order of 100200 ISS. The time t between probe pulses should be no less than 3-4 ml. S (the maximum cost is between {{ca} between the first and last ray reflected from the ionosphere for real paths). When this signal is received, the trigger combinations from the receiver demodulator output go through the input tiMHe 14 to the input of the decoding device 1, and eondi {} receive pulses from the receiver output through the logarithmic amplifier and integrator (not shown) fto the input bus 13 enters the input of the And element four.

 Before the start of the cycle, the change in the signal coming from the input bus 15 is triggered to the state in which the element 11 is open and the element 12 is closed. When the first start-up combination is received, the signal from the output of the decorating device 1 causes the divider 9 to exit, starts the shaper 2 shaper pulses, and HaSjto trigger 10, which closes the Element 11 and opens the Element 11, through the And 11 element. In addition, the signal from the output by the elements 11 is fed to the input of the counters 5, and they are reset to their original state. Divider 9 divides the frequency of the pulse coming from the generator 8 etyloynoy frequency, to the frequency of the next probe pulses. SigalGs output divider 9 is fed to the FBI URS5 5 in order to form a burst of pulses, next synchronously with the pulses of sounding.

  The synchronism is ensured by starting the driver and resetting the divider 9 yyalbm from the gate of the decoding device 1 when receiving a combination

Each impulse from the imaging unit 2 triggers the splitter 3, which, by means of the impulses coming from the generator 8, successively opens the item And 4.

Thus, the image of the curve is extended over time by the period of the probe pulses by. parts.

Since all the counters 5 are reset, the resolving potential is fed from the outputs of their outputs to the inputs of the elements AND 4, and a prohibitive function is fed from the other outputs of these counters to the inputs of the elements And b. The pulses coming from the input bus 13, depending on the time of their arrival, are recorded in that or another counter 5. Since the delays between the beams formed by Each of the probe pulses when they are reflected from the ionosphere, are the same for all the pulses, the pulses corresponding to A beam with a given delay, from each probing impulse, is recorded in the same counters, while the pmesh impulses, and due to their random x & ractor, are recorded in different counters. Upon receipt of tn (where m bl) pulses, the counters 5 overflow, and the corresponding element AND 4 is closed and the corresponding element AND b is opened. And the completion of one or another counter 5 indicates the presence of a beam with a delay corresponding to this counter, the counter, and the number of overflowed counters - the number of received rays. When receiving the second start-up combination, the signal from the output of the decoder through an open element And 12 produces a message of elements And 6 k, in block 7 of the registration, information on the number of received beams and the corresponding delays.

If the first start-up combination is not accepted due to dictation, then the Measurement of production is performed on the second one, and the registration is recorded on the third starting combination.

Claims (1)

Formula of inventions  A time interval measurement device containing a decoding device, a reference frequency generator, Frigger, a measuring counter, a recording unit, and logical Q elements AND so that, in order to improve the noise immunity of the device, into it A frequency divider, a burster of pulses and a distributor are entered, and the number of measuring counters is brought to / t, and the output of the decoder is sent to the control input of the pulse builder, the reset bar of the frequency generator and the inputs of the first and second elements; 0 combo And, the other inputs of which are connected to the trigger, whose input should be connected to the first input bus and the other to the output of the PSI element, clock inputs: frequency divider and distributor connected to the output of the reference generator, j outputs of the distributor connected to the inputs of elements AND , the second inputs of which are connected to the second input bus, the outputs - to the inputs of the p- measuring counters, and three , these - to the outputs of these meters, the outputs of the CBtMO queue, are connected to the inputs of other AND elements, the second inputs of which are connected to the output of the second element and, and the outputs - to the BYAoyu registration. / J ffff fs TH flucffoSaa poploinaci Jlk -L1. 7 On (rig.1 , 3o ffup {/ fOUffff UAffTf / lbft / ШЮ1