SU1307557A1 - Time interval-to-noise-like signal converter - Google Patents

Abstract

The invention relates to a pulse technique and can be used in signal processing systems with an intense level of interference. The aim of the invention is to increase the reliability and simplify the device. To achieve this goal, an And 3 element, two dividers 2 and 5 frequencies are introduced into the device, of which divider 5 is with a variable division factor, and generator 7 of a noise-like signal. The device also contains an input bus 1, a generator of 4 pulses and a counter of 6 pulses. At the output of the device, a noise-like signal is formed, the period of the correlation function of which is proportional to the average value of the time interval at the input of the device. 2 Il. and (L s -o about the joint venture JF Fi. g

Description

The device relates to a pulse technique and can be used in signal processing systems with an intense level of interference.

The purpose of the invention is to increase reliability while simplifying.

FIG. 1 shows an electrical functional diagram of the device; in fig. 2 - time diagrams that show his work.

The time interval converter into the noise-like signal contains an input busbar 1 connected to the input of a divider 2 frequency and the first input of an AND 3 element, the second input of which is connected to the output of a generator of 4 pulses and a counting input of the divider & frequencies with a variable division factor, and the output - with the counting input of the counter 6 pulses, the setup input of which is connected to the output of frequency divider 2 and the recording input of frequency divider 5, and the outputs - with information inputs of frequency divider 5, the output of which is connected through the noise generator 7 with the output bus.

The essence of the proposed technical solution is that the lengths p of the input time intervals are averaged and converted into a proportional period of a noise-like signal, for example, a signal based on the M-sequence 1110100, which allows, by correlation processing, to extract the useful signal against the background noise that exceeds it amplitude. At the same time, a change in the period of the noise-like signal corresponds to a proportional change in the period between the peaks of the correlation function, which is not sensitive to the effects of interference, 1.5–2 times the amplitude of the noise-like signal.

The period of the noise-like signal is modulated by changing the frequency of the pulses arriving at the shift input of the noise-like signal generator, which can be implemented on the basis of feedback shift registers.

Pa figs. 2a, b show timescales of averaged time intervals of various durations; in fig. 2c, d are the corresponding noise-like signals formed on the basis of the M-sequence 1110100; in fig. 2e, e are the graphs of the corresponding correlation functions; in fig. 2g, 3 - time spans of the additive sum corresponding to their noise-like signals and interference, 5–2 times greater than their amplitude; in fig. 2i, k are graphs of the corresponding correlation functions, confirming the possibility of measuring the period of a noise-like signal against the background of interference.

The device works as follows.

The time intervals are fed to the input of the splitter 2 frequency, the output of which pos0

five

After the arrival of p time intervals, a short pulse is formed along the rise front of a unit potential of the last p-th time interval, and the content is recorded along the rising edge of which

the counter 6 to the divider 5 with a variable division factor; and on the decay front, the counter 6 is reset to the zero state.

The unit potential of each i-ro time interval,, 2, ..., p, opens element I 3, through which the pulses from the output of generator 4 arrive at the clock input of counter 6 and stack in it with the previously accumulated sum of codes corresponding to the duration previous (i-1) x time intervals. Simultaneously pulses with

5 outputs of the generator 4 with the frequency fo are fed to the clock input. divider 5, the division factor of which K is equal to the average value of the durations p of time intervals received at the input of the converter during the previous conversion cycle. The pulses from the output of the divider 5, which follow with frequency, arrive at the shift input of the generator 6 of the noise-like signal, as a result of which a noise-like signal is continuously formed at its output, the period T of which is proportional to the value K:

t N K1 -G, t g

1d10

where N is the number of M-signal symbols.

After the arrival of p time intervals on the rising edge of the pulse from the output

the divider 2 changes the conversion factor K of the divider 5, which becomes equal to the new average value of the durations p of time intervals, which leads to a corresponding change in the period of the BW noise-like signal.

In the future, the device works in a similar way.

Thus, a noise-like signal is formed at the output of the device, the period of the correlation function of which is proportional to the average value of the time interval at the input of the device.

Claims (1)

Invention Formula A time interval transducer in a 1 like signal containing an input bus, a pulse generator, a counter, an output bus, characterized in that, in order to increase reliability while simplifying the transducer, an And element is inserted into it, two frequency dividers, one of which with a variable division factor , a noise-like signal generator, the output of which is connected to the output bus, and the input is connected to the output of a frequency divider with a variable coefficient de0 five 0 five 0 five The information inputs of which are connected to the counter outputs, the recording input is with the installation input of the counter and the output of the frequency divider, and the counting input is with the output of the pulse generator and the first input of the And element whose output is connected to the counting input of the counter, and the second input is with the input frequency divider and input bus. but 6 d w and t f FIG. 2