SU529564A1 - Radio communication system - Google Patents

Description

(54) RADIO COMMUNICATION SYSTEM

FIELD OF THE INVENTION The invention relates to radio communications and can be used for radio communications between correspondents both separately and simultaneously with discrete and analog information. Radio systems are known in which intermittent transmissions are periodically interrupted to enable automatic search for a suitable carrier frequency for the current conditions from the carrier frequency sequence l. At the master station, one of the signals arrives at the modulator through one ventilator and discrete information through the other. When one of the valves is turned on, the other is turned off. The selected carrier comes from a set of generators. Automatic search occurs at reduced signal powers of the master and slave stations. Reception of such signals by the slave station causes its transition to normal operation. Radio links are also known for transmitting discrete information on the main channels on sub-satellite frequencies with compression by full-length channels of frequency telegraphy 2j. Such radio links on the transmitting side in the main channel are serially connected discrete information source, a subcarrier switch, to the other inputs of which a subcarrier generator is connected to a carrier switch, to the other inputs of which two carrier generators, a power amplifier and an antenna-feeder device are connected on the Transmission, and to each generator of carrier frequencies there are connected in series an additional encoder and a manipulator, and on the receiving stop In the main channel there are serially connected antenna-phi-core device, common path of amplification and signal conversion, two-channel intermediate frequency path, through which the channel through the amplitude detector of the intermediate frequency envelope is connected to the first subtraction node, cbj-x channel path of subcarrier frequencies, each channel through the amplitude envelope detector of the subcarrier frequencies is connected to the second subtractive node, and the processing path and forming a signal of discrete information, and

The second spinning channel of the intermediate frequency channel is connected to a discrete information processing device of an additional channel containing an electronic key, the control input of which is connected to the amplitude detector of the intermediate frequency envelope of the corresponding channel through the Schmitt trigger connected in series, phase-shifting subcarrier frequency filter .

In the known Russian line, the shaper, made in the form of a Schmitt trigger, to reduce the level of interference from the main channels to the additional ones, controls the electronic channel of the additional channel, turning it off for the duration of the absence of the information signal. However, triggering (| x) of the lighter is carried out from a signal with a passive pause of the form of amplitude telegraphy (AT), which does not allow its high noise immunity, especially at the signal / shu ratio, when the pulses generated by it will be crushed and edge distortion When transmitting only one signal via an additional reception channel, false positives of the imager are also possible with the Small signal-to-noise ratio.

In addition, the rigid connection of an additional source of information with a single carrier part on the transmitting side does not allow the use of another unrealistic insistence, in the case when the first carrier frequency turns out to be susceptible to distortion. from-: - the existing station.

The purpose of the invention is the teka. increase noise immunity.

The goal is achieved by introducing an additional switch on the transmitting side to the mode switch, the inputs of which are connected to a co) frequency mutator of the subcarriers and a generator of subring frequencies, and ByhogasG with a combination of lying frequencies and an additional ground input; the switch, the corresponding inputs Koi oporo connect to sources

information, and the output is to the modulator, and to the additional receiver Sgoren, enter additional amplitude data centers, depots of lint-fi

the keys, the elements of AND and OR, with this, the output of each path of the gydnes frequencies through

therefore, the connected additional detector and the auxiliary key are connected to the OR input, the output of which is connected to the first inputs of the AND elements, the second inputs of which are connected to the outputs of the former, and connected to the control inputs of the corresponding keys.

Fig. 1 shows a structural electrical circuit of the transmitting side of the proposed radio communication system; in fig. 2 is an electrical electrical receiving receiver circuit of the proposed radio communication system.

The radio system on the transmitting side contains a source of discrete information 1, a switch of subcarrier frequencies 2, a generator of subcarrier frequencies 3, a switchboard of mode 4 and carrier frequencies 5, a master oscillator of carrier frequencies 6, a power amplifier 7, an antenna feeder device 8, a modulator 9, an additional switch 10 and information sources 11, and on the receiving side - antenna-feeder device 12, amplification and conversion path 13, intermediate frequency paths 14, amplitude detectors 1.5, first subtraction unit 16, pre-filter Subjects 17j subcarrier paths 18, actite detector detectors of subcarrier frequencies 19, second subtraction unit 2O, processing path and forming discrete information 21, keys 22, limit amplifiers 23, discriminators 24, low-pass filters 25, information processing paths 26, driver 27 , additional amplitude detectors 28, additional keys 29, element OR 30 and elements AND

31.

The radio system works as follows.

in a way.

When transmitting a message only from the source of discrete information 1, the switch receives subnet 2 frequencies that commutes two frequency subcarriers produced by 1 frequency subgenerator 3. When the information is transmitted, the binary code is pressed to the symbol Press one corresponding frequency generator of the subcarrier frequency and the Spin-out symbol is different. Further, the signals in the bursts of rectangular pulses through the mode switch 4 transit go to the carrier switch 5, which commits the carrier frequency oscillations produced by the driver of the carrier frequency generator 6. Naturally, the carrier switches comes with a frequency of subcarrier frequencies. From the output of the switch 5, oscillations through amplifiers with a power of 7 are positioned in the antenna-feeder device 8.

Claims (2)

1.Patent of France No. 212О092, cl. H 04 B 7/00, 1972, Patent of Great Britain No. 1267652, cl. H4 L, 1972 2. Avt.Sv. № 477548, M.kl. H 04B7 / 16, 1972 (prototype). We