Device for serviceability check of superheterodyne receiver

FIELD: radio communications.

SUBSTANCE: pulse noise is detected upon conversion of signal received into intermediate frequency, noise active time is determined, information signal is disconnected from amplifier incorporated in superheterodyne receiver, noise-affected part of information signal is recovered by eliminating simulator signals during extrapolation, and superheterodyne receiver is checked for serviceability at intermediate frequency.

EFFECT: enhanced precision of superheterodyne receiver serviceability check.

1 cl, 1 dwg

 

The invention relates to radio communications and can be used to monitor the health of a superheterodyne radio receivers moving objects without interruption in the reception of analog signals when exposed to pulsed interference from electronic devices, radar, and navigation.

A device to monitor the health superheterodyne radio receiver containing sequentially connected to simulator input signal, the key and the gate, the input of which is connected with the information input superheterodyne receiver, connected in series to the first switching unit and an output amplifier connected in series to the second switching unit and extrapolator, connected in series power quality assessment and indicator the item, OR (see speaker of the USSR №1418920, CL H 04 3/46, 1984).

The disadvantage of this device is the low accuracy of the control. The purpose of the invention is improving the accuracy of monitoring the health of a superheterodyne radio receiver.

To achieve this goal in the device to monitor the health superheterodyne radio receiver containing sequentially connected to simulator input signal, the key and the gate, connected in series to the first switching unit and an output amplifier connected in series to the second switching unit and the extras is pastor, connected in series power quality assessment and indicator element OR added N blocks detection of pulsed interference (PI)whose inputs are connected to the output of the monitored receiver and the outputs to the inputs of the OR element, a differentiating unit, an input connected to the OR gate's output and the output with the inputs of the control key, the first and second blocks of the switch, the second output of the second switch unit is connected to the input of the evaluation unit quality output extrapolator connected to the input of the first shift unit.

The drawing shows a structural electrical diagram of the device.

Device to monitor the health superheterodyne receiver contains consistently United simulator 1 input key 2 and the valve 3, the output of which is connected with the information input controlled superheterodyne receiver 4, N block 9 detection FE, each of which consists of series-connected filter 12, the amplitude detector 13, the threshold unit 14, a driver 15 pulses, and the input of the filter 12 is connected to the output intermediate frequency (if) controlled superheterodyne receiver 4, connected in series to the first switching unit 5, and an output amplifier 6, the output of which is input receive the I information connected in series, the second block 7 switching and extrapolator 8, the output of which is connected to another information input of the first switching unit 5, connected in series OR element 10, the inputs of which are connected to the outputs of the shaper 15 pulses blocks 9.1,...,9.N detection FE, and the differential unit 11, the output of which is connected to the control inputs of the first key 2, the first 5 and second units 7 switch, connected in series block 16 quality assessment, an input connected to other information the release of the second unit 7 switch and indicator 17.

The principle of the proposed device is based on the detection of impulse noise on the output of the intermediate frequency controlled superheterodyne radio receiver, resulting from the action of radio engineering devices radar and radio navigation, and formation instead of the FE signal simulator that is compatible with the information signal of the monitored receiver. At the same time disabling the analog outputs (phone, mode FM) radio from the recipient information and the recovery information signal is by using extrapolation methods.

The principle of compensation pulse interference by extrapolation, see the Analysis and optimization of one method of suppressing impulse the th interference, auth. Bykhov M.A., Terekhov A.S. /proceedings of the R & d No. 4. - M, Radio and communications. 1986

The device operates as follows. Information signal, exposed to impulse noise output intermediate frequency (if) of the controlled receiver arrives at the inputs of N units 9.1-9.N detection of FE. The number of units 9.1-9.N is selected depending on the accuracy of the detection Ipfilter 12 units 9.1-9.N detect IE set to a certain frequency spectrum of the information signal, the most exposed to impulse noise. From the output of the filter 12, the signal of a certain frequency passes through the amplitude detector 13 and a threshold unit 14 to the input of the pulse shaper 15. The new signal at the output of the threshold unit 14 positive polarity runs shaper 15 pulses. The pulse duration at the output of the driver 15 is equal to the duration of the impulse noise and is selected based on a priori information about the sources of FE see Knyazev A.D. elements of theory and practice of ensuring EMC. - M.: Radio and communication, 1984, 336 S.

In the presence of FE in at least one of the units 9.1-9.N discovery IP output item OR 10, you receive the pulse signal. The positive pulse from the output of the differentiating unit 11 via the first switching unit 5 connects the output of extrapolator 8 to the input of the output amplifier 6. Extrapolator sushestvam recovery of the affected IP section of the information signal. Using the second unit 7 switching information output of the monitored receiver 4 is disconnected from the input extrapolator 8 (this is necessary to improve the accuracy of the extrapolation of extrapolator 8 by eliminating the extrapolation of signals simulator 1) and is connected to the input unit 16 quality assessment. This unit is designed for the classification of the technical condition of the monitored receiver 4. The principle of operation of the unit 16 based on the measurement of signal level simulator 1 (see Davydov PS Technical diagnostics REU and C. - M.: Radio and communication, 1988. - 256 S.).

In addition, the signal of the differentiating unit 11 opens the key 2 and the signal simulator 1, with the level of sensitivity of the controlled receiver to the input of the receiver. On termination of IE at the output of the differentiating unit 11 is formed a signal of negative polarity, which closes the key 2, preventing the passage of the signal simulator 1 to the input of the controlled receiver 4. In addition, this signal using the first switching unit 5 connects the information output (phone output mode FM) receiver 4 to the input of the output amplifier LSI by using the second unit 7 switch connects the information output of the receiver to the input of extrapolator 8, thus disabling the block 16 quality assessment. The valve 3 is designed for the of avoiding the hit signal simulator 1 in the circuit AFD. Extrapolator 8 and the output amplifier canstruction are part of the controlled receiver.

Technical appraisal and economic benefits of the proposed device in comparison with the device of the prototype are to increase the accuracy of testing superheterodyne receiver. The application of the proposed device for monitoring the technical condition of VHF FM radio stations moving objects will allow for 2...5% increase in the number of Pracovni compared with the device prototype. In addition, 1.1-1.2 times reduced length checking.

Device to monitor the health superheterodyne radio receiver containing sequentially connected to simulator input signal, the key and the gate, the output of which is connected to an informational campaign superheterodyne receiver, connected in series to the first switching unit and an output amplifier connected in series to the second switching unit and extrapolator, connected in series power quality assessment and indicator element OR, characterized in that, to improve the accuracy of control, inputs of N blocks detection of transients, each of which consists of series-connected filter, peak detector, a threshold unit and the pulse shaper, the input block is s detection of impulse noise connected with the output of the intermediate frequency superheterodyne radio receiver, information (by phone), the output of which is connected to the inputs of the first and second switch blocks, the outputs of blocks detection of impulse noise are connected to the inputs of the OR element, the output of which is connected to the input of a differentiating unit, an input connected to the OR gate's output and the output with the inputs of the control key and the first and second blocks of the switch, the second output of the second switch unit is connected to the input of the evaluation unit quality output extrapolator connected to the input of the first shift unit.



 

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FIELD: radio communications.

SUBSTANCE: pulse noise is detected upon conversion of signal received into intermediate frequency, noise active time is determined, information signal is disconnected from amplifier incorporated in superheterodyne receiver, noise-affected part of information signal is recovered by eliminating simulator signals during extrapolation, and superheterodyne receiver is checked for serviceability at intermediate frequency.

EFFECT: enhanced precision of superheterodyne receiver serviceability check.

1 cl, 1 dwg

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