SU1425750A1 - Device for receiving information with time distribution of channels - Google Patents

Abstract

The invention relates to the field of information transmission and can be used in telemetry systems, in particular, in radio radar systems of the atmosphere. The aim of the invention is to increase noise immunity and simplify the device. The device contains a receiver 1, the distribution

Description

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 The invention relates to the field of information transmission and can be used in telemetry systems, IB in particular, in radionation systems of the atmosphere.

 The aim of the invention is to improve noise immunity and simplify the device.

Figure 1 shows the block diagram of the device; Fig. 2. Principle diagram of the pulse distributor; FIG. 3 is a circuit diagram of a pulse width to amplitude converter; FIG. 4 is a schematic block diagram of the multiplexers G of FIG. 3 — timing diagrams of operation of the device in the absence of interference; figure 6 - timing diagrams in the presence of interference.

The device contains (FIG. 1) receiver 1, pulse distributor 2, inverter 3, elements 2И 4, J-4, N, pulse width amplitude converters S.lrS.N, keys 6., N, elements 7.1-7 , N comparison, the element ZILI-I 8, the elements 2I 9.1-9.N, D- triggers 1Q.1-10.N, the element OR-NOT P block 12 multiplexers.

Distributor 2 pulses (FIG. 2) contains a shift register 13 and an element OR NOT 14O. Each of the Sl-SN converters (fIGoZ) includes a dongle 15, a resistor 16, a capacitor 17 and a dongle 18. Block 12 multiplexers (figure 4) multiplexers 19.1-19.N, Comparators block 20 contains elements 2И 4. 1-4.N, converters 5. 1-5.N pulse duration in amplitude, keys 6.1-6.N and elements 7.1- 7.N comparison

The device works as follows.

The information transmitted from the channel to the port is fed to the input of the receiver I, where the useful signals are allocated. At the output of receiver I, a sequence of rectangular pulses of a group telemetry signal is formed, the telemetry frame of which contains N channel pulses, and the informative parameter of the channel signal is the duration of the time interval between the positive edges of adjacent pulses (Figures 5 and 6).

One ns channel (s, for example, the first signal, has a minimum duration and is a reference (synchronization channel). From the output of receiver 1, a group message arrives at the input of the distributor 2, at the outputs of which rectangular pulses are formed, the duration of which is equal to

425750-4

Since the sequence of following channels is known, after finding the reference line NRL, it becomes possible to connect the outputs of the distributor 2 with the device outputs in such a way that the channels {s signals are located at the outputs of the device

tive time interval corresponding to a given sequence. Element

channel. Thus, distributor 2 divides the group telemetry message into channel signals.

The selected channel signals are successively received in time at the inputs of converters 5.1-5.N, where they are converted into voltage amplitudes. The output voltages of the converters 5,1-5, N are supplied to the keys 6.1-6.N, which connect the inverting inputs of the elements 7.1-7.N to them to them. Each comparison item .N compares the voltage of the corresponding channel with the voltage of that channel that is currently applied to the inverting input. At the outputs of the .7.1-7.N elements of the comparison, a code combination is formed, which consists of one logical unit, in case the voltage of the reference channel is applied to the inverting inputs. The results of comparing the reference channel with itself and with the previous one (which is discharged at this time) are unpredictable, therefore these signals in the code combination are blocked by the ZILI-KI element 8. This scheme also determines the moment of the occurrence of a code combination of logical units and gives the output in this case the level of logical units. This signal through the elements 2I 9.1-9.N enters the information inputs of the trigger 10.1-10.N. The recording in triggers 10.1-10.N is carried out on the leading edge of the pulses formed by the elements 2I 4.1-4.N. The level of the logical unit is formed at the output of the trigger .N, the number of which coincides with the output number of the splitter divider 2, on which the signal of the reference channel is present. Elements 2I 9ol-9.N are designed to eliminate inaccurate recording in case the previous channel signal before the reference signal is larger than the reference signal, but less than all the others.

0

five

0

35

dd; The IPI-HE 11 generates a signal used in processing the received information in case all the triggers 10.1 10.N are set to the logical zero state, which is a consequence of the synchronization failure. Additional signal blocking is accomplished by decoupling block 12 of multiplexers 12 at this moment.

Converters 5.1-5.N work as follows. Before the arrival of the channel signal to the control input of the charging switch 15, the capacitor 17 is discharged through the discharge switch 18. With the arrival of the channel signal, the charging switch 15 opens and the capacitor 17 starts to charge through the resistor 16 and the switch 15 from the constant source tension At the end of the channel signal, the key 15 is opened and the voltage and is stored on the capacitor 17, which is maintained until the next discharge pulse.

The increase in noise immunity is achieved by reducing the load on the outputs of the converters.

The detection time of the sync clock is reduced. So, if at worst, in the worst case, the detection time of 4Q clock synchronization is equal to the cycle

telemetry message, then in the proposed device it is reduced to one channel time interval, since in the prototype the full result of comparing the duration of the channel signals is formed per cycle of the telemetry body, and in the proposed device in the subsequent channel interval after the interference.

Claims (2)

1. A device for receiving information with a time division of channels, containing a receiver, the input of which is connected to the communication line, the output is connected to the inputs of the pulse distributor and the inverter, the output of the inverter is connected to the control input of the comparator unit the combined information inputs of the Gshok Comparators and the multi-p. Pexor block are connected to the corresponding outputs of the pulse distributor, the outputs of the multiplexer block are with the first outputs of the device, which is exactly the same as the noise immunity and simplification of the device , The elements AND, the element OR-ID D-triggers the element OR - NOT, the output of which p is the second output of the device, the first outputs of the comparators block under the first inputs of the corresponding elements OR of the OR elements are inserted into It and the third inputs of which are connected to the corresponding outputs of the pulse distributor, the output of the element; -triggers, synchronization inputs of which are connected to the second 1 output of the comparators block, direct outputs of D-flip-flops are connected to the control 1b " FIG. g 0 5 five to the lex inputs of the multiplexer unit and the corresponding inputs of the element OR NOT. 2. The device pop. 1, which differs from the fact that the comparators block contains AND elements, pulse-to-amplitude converters, keys and comparison elements, the first inputs of AND-keys, switches and pulse-to-amplitude converters are information inputs the block of comparators, the combined second inputs of the AND elements are the control input of the block, the output of each element AND is connected to the resetting input of the same pulse width to amplitude converter and is the second output of the com Arathor, pulse duration converters outputs the amplitude coupled with inputs of the corresponding straight elements and comparing with the second inputs of the respective keys, you moves all keys are coupled and connected to the inverted inputs of the respective comparator element whose outputs are the outputs of comparators and pervp block. I J .