SU1587557A1 - Device for reception of telemetering information - Google Patents

Abstract

The invention relates to telemetry and can be used to receive compressed messages, in which information about the telemetry function is contained in five typical signals (symbols) generated at clock points of time. One of these symbols indicates that the function achieves some predetermined value, four others indicate the presence of repeated or single positive and negative single increments, respectively. The purpose of the invention is to increase the reliability of information by automatically restoring the normal functioning of the device after possible failures and interruptions in communication, which eliminates the accumulation of a recovery error. The device contains an identifier of 1 characters, elements OR 2, 8, 9, triggers 4, 5, elements AND 6, 7, synchronization unit 3, reversible counter 10, memory unit 11, group of elements 12.1 - 12.N. 1 tab., 2 Il.

Description

.2

The invention relates to a technique for transmitting information and can be used in telemetry systems for receiving and retrieving compressed messages.

The technical task of the present invention is the restoration of the transferred function nq to received typical signals. This problem can be easily solved on the basis of the analysis of information determined by typical signals in accordance with the table, and also taking into account this fact that the time interval during which repeated unit positive increments take place is limited by the signals + Si and + So, and a time interval with repeating single negative increments of the signals-Si and-So.

The purpose of the invention is to increase the reliability of information. .

FIG. Figure 1a shows the structure of a compressed telemetry message; in fig. 16 view of the restored function I (tl); in fig. 2-functional diagram of the device for receiving telemetry information. The device contains the identifier 1 characters, the first element OR 2, the synchronization unit 3, the first 4 and second 5 triggers, the first 6 and second 7 elements AND, the second 8 and third 9 elements OR, the reversible counter 10, the memory block 11, the group of elements AND 121-12N.

The device works as follows.

The telemetry input signal of the type shown in FIG. 1a, enters the identifier 1 characters, where it is converted to. sequences of video pulses appearing at outputs 1-5. Pulse durations are the same and less than the time interval. The amplitudes of the pulses correspond to the logic level 1. Obviously, a pulse can occur only at one of the outputs at the same time, while at the first output the pulses correspond to the presence of a symbol with a recognized, ohm + Si, at the second output - a symbol with the sign + So, at the third output - to the symbol with the –S l sign, at the fourth output - to the symbol with the –So sign, at the fifth output - to the Symbol with the S sign. Pulses from five outputs go to the five-way element OR2. These pulses indicate the presence of any of the symbols and in their entirety form a series of clock pulses arriving at the input of synchronization unit 3, which, being synchronized with them, produces a periodic sequence of clock pulses.

From the first output of the identifier 1 symbols, the pulses also arrive at the first input of the first trigger 4, These pulses determine the beginning of the time intervals during which the transferred function has a number of repeated single positive increments and, on the first input of the trigger 4 (input ), set it to position 1. From the second output of the character identifier 1, the pulses arrive at the second input (input R) of the trigger 4. These pulses limit the time intervals during which the transferred function has a single positive when and return trigger 4 to position O. Thus, at the output of trigger 4, signals with a logic level 1 are generated, the duration of which corresponds to the duration of time intervals in which repeated positive increments of the transferred function occur. The signal from the output of trigger 4 goes to the first input of element 6, the second input of which receives clock pulses from the first output of block 3. At the output of element 6, a burst of clock pulses is formed, each of which passes through the element 8 first input of the reversible counter

10, increasing its content by one. Pulses from the second output of the identifier 1 characters can appear also at the moments of single positive single increments. Proceed to the second entrance trigger

4, these impulses do not violate the logic of its functioning. However, acting on the second input through the element OR 8 at the first input of the counter 10, they also increase its content by one unit.

The second processing channel, consisting of trigger 5, element AND 7 and element OR 9, and responding to pulses corresponding to the signals -Si and -So, operates in exactly the same way. With this impulses

from the output of the element OR 9 arrive at the second input of the reversible counter 10 and reduce its content by one.

The third input of the reversing counter 10 receives impulses from the fifth output of the identifier 1 symbols corresponding to the signals S. Each such pulse causes the number code I to be forcedly written to the counter 10 stored in memory block 11 and sent from its outputs to the installation inputs of the counter 10. The counter size of the counter 10 is determined by the maximum possible value of the restored function.

At the outputs of the counter 10 in this way

a code of the number A (ti) is generated, corresponding to the values of the recovered function at clock points. This code enters the outputs of the device through groups of elements 12, the second inputs of which receive read pulses from the second output of synchronization unit 3, which are delayed relative to the clock pulses at its first output for the time required to perform operations in the counter 10.

Thus, the additional introduction of new elements allows one to receive a compressed symbolic telemetric message and unambiguously restore the numerical value of the transmitted discrete-quantum function. In this case, the forced installation of the counter 10 by the signal S to the initial state corresponding to the code of the number I ensures the unambiguity of the restoration of the constant component with the account of the transferred function, which increases the reliability of the recovered information, since after possible failures and interruptions in communication the reception of the next character S. This also eliminates the possibility of accumulating the recovery error of the pb signals to the increments.

Claims (1)

Apparatus of the Invention A device for receiving telemetric information, comprising a symbol identifier, the input of which is the input of the device, first-fifth outputs connected to the corresponding inputs of the first element OR, the output of which is connected to the input of the synchronization unit, the second and third elements OR, the first inputs 5 of which are connected respectively to the second and fourth outputs of the character recognition, a group of elements AND whose outputs are the outputs of the device, characterized by that, in order to increase the reliability of the information, a reversible counter, triggers, AND elements and a memory block are entered into the device, the outputs of which are connected to the reversible counter installation inputs, the outputs the first and second inputs of the first trigger are connected respectively to the first and second outputs of the character identifier, the first and second inputs of the second trigger are connected respectively to the third and fourth outputs of the character identifier, the outputs of the first and second triggers are connected with the first inputs of the same elements And, the outputs of which are connected to the second inputs of the second and third elements, respectively, the outputs of which are connected respectively to the first and second in ormatsionnymi inputs of down counter, whose control input is connected to said fifth output identities of characters, first and second outputs respectively connected to the synchronization block of the first and second inputs of second AND gates and the second inputs of AND gates 5 groups. 0 five 0 Sign of the symbol Informational content S -Si -82 + Si + So the function has reached some predetermined sign The transferred function has several repeated negative unit increments. The transferred function has one negative unit increment (including the last in a series of repeating) The transferred function has several repeated positive single increments. The transferred function has one positive unit increment (including the last in a series of repeating) 5 -So "SoS-Sf -So fej 5 5o 5o