SU738183A1 - Device for measuring probability characteristics of the processes of restoring synchronism by cycles - Google Patents

Description

(54) DEVICE FOR MEASUREMENT IN ROYAT US SUSHSZ & Kf

PROCESSES OF RISING OF SHNHYSHESH ON

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The invention relates to radio engineering and can be used in devices that ensure the synchronism of sources and receivers of information in systems for transmitting discrete messages and in systems with digital modulation methods of analog signals.

A device for measuring the likelihood characteristics of recovery processes is known. cycle synchronism, comprising: a sequentially connected control sequence generator and a pulse shaper, the prohibiting input of which is connected to the output of the counter 1 of the test number, & also a time signal generator and recorder 1. .

However, the known device has insufficient measurement accuracy and does not allow the measurement of such important characteristics of the frame synchronization device as the detection time of the absence of synchronism and false fixations of the state of synchronism.

The purpose of the invention is to improve the measurement accuracy.

For this, the device for measuring the probabilistic characteristics of the processes of rotational synchronization on cycles, containing successively educed formation units; Yprayl yuyoy sequence and a pulse shaper, prohibiting the input of which is connected to the output of the counter of the number of tests, as well as the shaper of the time signals and the register of the pattern, are in the block

10 false phasing detection unit, synchronization detection time detection unit, synchronism search time detection unit, permissible time setting unit

The synchronization recovery unit 15, the comparison unit and the OR element, the output of the pulse shaper, which is the output of the device, is connected to the input of the test number counter and to the combined first inputs of the comparison block, the false phasing detection unit and the time limit detection unit. synchronism, the second input

25 of which, being the device input, bridged by the second input of the false phasing detection unit and the first input of the Synchronism search time determining unit, the second input

thirty

738183

KoYBpbi o is connected to the output of the time signal generator and to the third input of the absence of synchronism detection time detection unit, the output of which is connected to the first input of the OR element, the second input of which is connected to the output of the synchronism search time detection unit, and the output of the definition unit Synchronism Failure Detection Time, Synchronism Recovery Time Alignment Unit, and OR element are connected to the corresponding inputs of the comparison unit, the output of which and the outputs of the obna- some time to come. There are no synchronic signals, a synchronization search time detection unit, a false phasing detection unit and an OR element connected to the corresponding recorder inputs, except that the false phasing detection unit contains a trigger with a remote start, which are the block inputs, and , the first and second inputs of which are connected respectively to the output and the second INPUT of the trigger, and the output of the AND element is the output of the block.

The drawing shows a structural electrical circuit of the proposed device,

A device for measuring the probabilistic characteristics of the cycle synchronization recovery processes contains a sequence control unit 1, a sequence control shaper, 2 failures, a counter 3 test numbers, a false phasing detection unit 4, an out of sync detection time unit 5, the unit b comparison, shaper 7 "time signals, block 8, determine the time of the search for synchronism. Element 9 OR, recorder 10, unit 11 USTAIN and Additional time in current sync: Nizma, unit 4 detecting false phasing contains trigger 12 - &; separate start and element 13 I.

The device works as follows ((5pbm,; .black01M 1 control sequence is formed). The 7th period certainly exceeds the recovery time of Cyclic Sync, it is applied to the input of the formaker 2 2 pulses, which ensures the formation of cfs, the number of which corresponds to the number of tests determined by counter 3 numbers ys yatyy. By filling the counter 3

a signal is issued which inhibits the further formation of pulses. The pulse pulse arrives by the sync transmitter changing its temporary position. In addition, under the condition of work, the false phasing detection unit 4, the OOS time detection unit 5, the comparison unit

Since the number of tests is known, and the number of tests is H8, and the number of time synchronization devices are set, then the number of false phasing detection unit 4 can be used to determine the number of Extra Synchro status indicator triggers recorded by the recorder 10.

The average synchronism recovery time and its components: the absence of synchronism detecting time and the time of searching and fixing synchronism are measured in normalized time intervals using block 5 OOS time determinants, block 8 determining the synchronism search time and element 9 OR, Through block 5 The OOS time and the block for determining the synchronism search time 8 are traversed by a number of time stamps, for example, pulses with a tracking frequency, cycles formed by the shaper 7 of time signals. For block 5, the OOS time is determined by the length of time from the moment the clock signal phase changes until the frame synchronization device leaves the synchronism state, i.e. before the synchronism indicator switches to search mode. The synchronization search timing block 8 generates the number of pulses corresponding to the length of time during which the synchronization status indicator indicates the search mode. The results obtained at the outputs of the OOS time detection unit 5 and the synchrophase detection time unit 8 are summed using the OR element 9 to obtain the number of labels corresponding to the total synchronization recovery time.

From the outputs of block 5 OOS time detection, block 8, timing synchronization search and element 9 OR time stamps, which are sorted by the synchronous synchronization process, are sent to recorder 10 and also to the comparison block, which is used to measure differential and integral the distribution functions of the total synchronization recovery time, the absence of synchronization detection time, ma, and the total synchronization recovery time -.

The distribution function is measured as follows.

With the help of block 11 for setting the permissible time of synchronization, the necessary number that corresponds to the argument of a d-sports or integral function is necessary. .

Depending on the established by the unit 11 setting the allowable recovery time of the binary number of normalized intervals at the output of the comparison block b, a certain number of pulses corresponding to the restoration of the lost synchronization appears for a strictly defined, or not exceeding it, number of normalized time intervals . recorder input 10,

The results thus obtained make it possible to obtain the integral and differential functions of the distribution of the unit b supplied to the comparison of the number of normalized time intervals from the outputs of the distribution unit 5 of the OOS time, the unit 8 for determining the search time of synchronization and the element 9 OR.

Using the proposed device, it is possible to detect the number of false commits of the synchronization state, measure the average values of the total time, restoration of synchronism, detection time of the absence of the synchronism state, search time and fixation of the synchronism state, as well as the differential and integral distribution functions of the specified times of the recovery process .

Claims (2)

1. A device for measuring the probabilistic characteristics of the cycle synchronism recovery process, comprising a series-connected control sequence generation unit and a failure pulse generator, the forbidden input of which is connected to the output of the test number counter, as well as the time signal generator and the recorder, In order to improve the accuracy of the measurements, a false phasing detection unit, a block for detecting the absence of synchronism, a detection unit ELENI search time matching unit TU-AnShki-dbpuye RVR Vremeni-Ii -voe- an isolator, an idle unit and an OR element, while the output of the failure pulse generator, which is the output of the device, is connected to the input of the test number counter and to the combined first inputs of the comparison unit, the false phasing detection unit, and the block for detection of the absence of synchronism, the second input of which, being the input of the device, is connected to the second input of the false phasing detection unit and the first input of the unit for a certain search time of the synchrony. ma, the second input of which is connected 5 with the output of the imaging unit, time signals and the third input of the absence of synchronism detection time detection unit, the output of which is connected to the first input of the OR element, the second input of which is connected to the output of the synchronism search time detection unit, whose output, as well as the outputs of the time detection unit Detection of 6 missing Suns of the unit, unit of installation of permissible time 5, synchronization recovery and the OR element are connected to the corresponding inputs of the comparison unit, the output of which and the outputs of the time determining unit. the detection of the absence of a syncronism, the block for determining the synchronism search time, the detection unit; J false phasing and the OR element are connected to the corresponding inputs of the recorder. five 2. The device according to .P.1, about tl and - chuck) is that the block for detecting the false phase of the optics contains a trigger with separate start, inputs. which are block inputs, and 0 element And, the first and second inputs  CBT Brogb is connected accordingly; with the output and the second input of the trigger, and the output of the AND element is the output of the block. five Information sources. Taken into consideration 1. USSR author's certificate 280526, cl. H 04 L 7/02, 1968 (prototype). 0