SU1239646A1 - Device for checking serviceability of duplicated radio receivers - Google Patents

Abstract

The invention relates to radio engineering. The reliability of the control is enhanced when radio communication is maintained. The device contains r-1 control, signal, receiving antenna 2, keys 3-6, load el-7, analyzer (A) 8 for the presence of a useful signal, control unit. (BK) 9, indicator (I) 10, e-ti OR 1I, control unit 12, consisting of clock G 13, e-I AND 14 and counting trigger 15, controlled radio receivers 16, 17, A 8 contents g -p pulses, two pulse counters, rs-trigger.r, detector, limiter, zl-t and pulse shaper. BK 9 contains a pi, a kovy detector, two comparators, two reference voltage makers, and zl-t. RSHI. For monitoring, Gr.1 generates a test signal, for example. RF signal with the type of modulation used in the radio. The decision on the receiver's operability is made, BC 9, to-ry generally controls the determining parameters (sensitivity, selectivity, etc.) and when the latter exit from the border of the tolerances field, generates a failure signal that is displayed to AND 10. And 10 m. either simple, with sound and light indications of the fact of a failure, or at the same time to perform the functions of an automatic system sensor, a backup or another, hierarchically more complex system. we. 2 hp f-ly, 3 ill. (O (L ND CO so about 4 O Fi? 1

Description

The invention relates to radio engineering and can be used in automatic control systems for the technical condition of receiving communication channels with a duplicate set of radio receivers.

The purpose of the invention is to improve the reliability of the control while maintaining radio communication.

FIG. Figure 1 shows the structural electrical circuit of the device proposed; in fig. 2 - analyzer of the presence of the useful signal; in fig. 3 - control unit.

The device for monitoring the operability of duplicated radio receivers (Fig.) Contains the control signal generator 1, the receiving antenna 2, the first, second, third and fourth keys 3-6, the load element 7, the analyzer 8 the presence of the useful signal, the control unit 9, the indicator 10, the element OR 11, the control unit 12, consisting of the clock generator 13, the element. And 14 and the counting trigger 15, the first and second controlled radio receivers 1 6 and 1 7. .:

The analyzer 8 of the presence of the useful signal (Fig. 2) contains a pulse generator 18, first and second counters 19 and 20 pulses, RS flip-flop 21, detector 22, amplifier-limiter 23, Element 24 and pulse shaper 25, Control unit 9 ( Fig. 3) contains a peak detector 26, the first and second comparators 27 and 28, the first and second formers 29 and 30 of the reference voltage, and the element OR 31,

The device works as follows. . From the output of the clock generator 13, the control 12 (Fig. 1) pulses through the AND element 14, which, in the absence of a working signal in the reception channel, is opened by a signal from the output of the element OR 1, are passed to the counting input C of the counting trigger 15. With the arrival of the next pulse, the counting trigger 15. subsequently changes the state of its output, thereby switching the first, second, third, and fourth keys 3-6.

In the zero state of the output of the counting trigger 15 of the control unit 12, when there is no signal at the control inputs of all the keys, the test signal.

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srormirovanny generator h, cher ez normally for; The 1-pin contact of the second key 4 is fed to the input of the second receiver 17, the output of which is connected via a normally closed contact of the fourth key 6 to the control unit 9, which monitors the performance of this radio receiver. The output of the receiving antenna 2 through the contacts of the first key 3 is connected to the input of the radio receiver 16, the output of which through the normally closed contacts of the third key 5 is connected to the load element 7. Thus, in this cycle, the first radio receiver 16 is the main one the direct task is reception and processing of signals, and the second radio receiver 17 is under control and performs the function of a backup radio receiver,

 When the next clock pulse arrives at the counting input C of the counting trigger 15 of the control unit 12, a signal appears at its output, which, arriving at the control inputs of all the signals, switches them. Generator 1 is connected to the input of the first radio receiver 16, to the output of which is connected via the third key, 5 control unit 9, and the receiving antenna 2 and the load element 7 through the second and fourth keys 4 and 6 are connected to the second radio receiver 17, which during this cycle works in the main receiving mode.

Thus, alternate switching of the first and second radio receivers 16 and 17 is carried out from the main mode of operation - to the reserve with the control of the technical state of the backup in the given radio receiver clock cycle.

 implementing said monitoring, oscillator 1 generates a test signal, e.g. a high frequency signal with a modulation type, used in a radio receiver. The decision on the operability or inoperability of the monitored radio receiver is carried out by the control unit 9, which generally performs the pre-control, determining the parameters of the radio receiver (sensitivity, selectivity, etc.) and when the latter exit from the boundary of the tolerance field, it forms its signal at its output

The failure fault is displayed on the indicator 10. The latter, depending on the use of the device, can be either a simple indicator with a sound and light indication of the fact of failure, or simultaneously act as an automatic backup system sensor or. another hierarchically more complex system.

The test signal from the output of the corresponding radio receiver, converted into a constant voltage by a peak detector 26 (Fig. 3), is fed to one of the inputs of the first and, second, comparators 27 and 28, the other inputs of which have constant voltage levels, corresponding to the upper and lower limits of the tolerance field from the outputs of the first and second formers 29 and 30 of the reference voltage. When the monitored signal deviates beyond any border of the tolerances field, an error signal appears at the output of one of the comparators 27 and 28 the element OR 31 is fed to the output of the control unit 9. Thus, when a control is detected by the control unit 9, the failure signal from its output simultaneously with the indication goes through the OR I1 element to the input of the AND 14 element of the control unit 12,

Element I 14 is closed by a low level signal from the inverse output of the element OR 11, stopping the passage of pulses from the output of the clock generator 13 to the counting trigger 15, which blocks the tact switching of the first and second radio receivers from one mode to another, thereby eliminating the possibility of switching on in the next cycle inoperable radio in the main operating mode of operation.

Parallel to the load element 7, an analyzer 8 of the presence of a useful signal is turned on, the output of which is no signal in the absence of a useful signal at the output of the working radio receiver. If there is a useful signal at the output of a radio receiver operating in the main mode, the output of the analyzer 8 is a signal that arrives at the input of the element OR 11. At the inverse output of the latter, a low level signal is formed, the closing element AND 14, which is

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Restal pass pulses of the clock generator 13 to the input of the counting trigger 15.

Thus, the switching of the switching modes of the first and second radio receivers 14 and 15 during periods of receiving useful information is carried out, which results in switching from the operating mode to the monitoring mode only during pauses in the received useful signal.

Duplication of radio receivers, as a method of increasing reliability, is used, as a rule, in highly responsible communication systems, such as aeronautical. In these systems, speech is the main information signal.

The given embodiment of the analyzer 8 is the presence of a useful signal (FIG. 2) as applied to speech. The channel works as follows.

The signal from the output of the working radio receiver is fed to the input of the driver of 25 pulses, which at each transition of the input low-frequency signal through zero generates a pulse normalized in amplitude, the pulses formed by the driver of 25 are fed to the first 19 pulses of the pulse. At the same time, the second pulse counter 20 receives pulses with a constant period following from generator 18. The counting time of a fixed number of pulses n of the generator 18 by the second counter of 20 pulses is always constant, and the time of counting the same number of pulses and the first counter of 19 pulses is not constant and depends on the nature of the signal. The number n is chosen in such a way that when a noise is applied at the input of the analyzer 8, the first pulse counter 19 is filled before the second pulse counter 20, and when it is acted upon - later. Each of the pulse counters controls the reset of the other pulse counter to zero and changes the state of the RS flip-flop 21 so that the latter is in the one state when there is a speech signal at the analyzer input in the zero state otherwise,

The detector 22 and the amplifier-limiter 23 open the element And 24 in the presence at the input of the analyzer 8 any

signal (speech plus noise, noise) and closes it in the absence of the latter. Thus, at the output of the element I 24 and, consequently, at the output of the analyzer 8, the signal is only if both inputs of the element 24 have high-level signals, which is observed during transmission periods of the speech signal on the receiving channel.

Claims (2)

Formula of the invention I. Device for monitoring the operability of duplicated radio receivers, containing a control generator, a control unit, first, second, third and fourth keys, normally closed contacts of the first and second keys are connected to the inputs of the first and second controlled radio receivers, respectively. which are connected respectively to normally closed contacts of the third and fourth keys, the control unit whose output is connected to the control inputs of the first and second keys, characterized in that, in order to increase neither the reliability of the control when storing the radio connection, the receiving antenna, the load element, the indicator, the analyzer of the presence of the useful signal, the OR element are entered into it, and the control unit is made in the form of sequentially connected clock oscillator, the AND and hc trigger trigger, the output which is the output of the control unit, the input of which is the second input of the element I, the receiving antenna is connected to the normally closed contact of the first key and the normally open contact of the second key, normally open the contact of the first key and the normally closed contact of the second key are connected to the output of the control generator, the normally open contact of the third key is connected to the input of the control unit and the normally closed contact of the fourth key whose normally open contact is connected to the analyzer's input na0 five 5) 5 o l of the useful signal, the normally closed contact of the third key and the load element, the output of the control unit is connected to the indicator input - and the first input of the OR element, the second input and output of which are connected respectively to the analyzer output of the useful signal and to the input of the control unit whose output is connected to the control input is a third of its and fourth keys. 2. The device according to claim 1, about tl and - the fact that the analyzer of the presence of a useful signal contains a pulse shaper, - a pulse generator, the first and second pulse counters, RS-trigger, element And sequentially connected detector ц amplifier-limiter The output of which is connected to the first input of the element I, the second input of which is connected to the output of the RS flip-flop, the input of the pulse former is connected to the input of the detector, and the output is connected to the counting input of the first pulse pulse in the output of which is connected to the R input RS- trigger and input setting the zero of the second pulse counter, the counting input and output of which are connected by the corresponding output of the pulse generator, the S input of the short-circuit trigger and the input setting the zero of the first pulse counter, the input of the pulse generator and the output of the And element are respectively the input and output of the analyzer signal. 3, the device according to claim 1, characterized in that the control unit contains a peak detector, the first and second comparators, the first and second reference drivers, for example. and the OR element, the output of the peak detector is connected to the first inputs of the first and second comparators, the second inputs and outputs of which are connected respectively to the outputs of the reference voltage drivers and the inputs of the OR element whose output is the output of the control unit whose input is the peak input the detector. Editor N. Rogulich 3 Compiled by E, Golub Tehred M. Khodanych Order 3392/46 Circulation 728. Subscription VNISh State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 2 Proofreader A. Zimokosov