SU439071A1 - RADIOTELEMETRIC LINE - Google Patents

Description

one

The invention relates to methods and devices for demodulation, namely to radio telemetry lines of the decimeter wave band, can be used for transmitting multi-channel telemetry information in crypto-resistant radio telemetry lines.

A known radio telemetry line containing n information sources connected through the n inputs of the channel switch, starting from the second, and its first output to the input unit of the formation of personnel pulses, clock generator, the course of which is simultaneously connected to the first input of the signal conditioning unit with time-pulse by modulation and through the first input and second output of the channel switch to the second input of the signal conditioning unit with time-pulse modulation, the output of which is via the amplitude modulator Inen to the nerve input of a radio transmitter connected by its output to a transmitting antenna; a receiving antenna connected through the linear part of the receiver, a video detector, a video amplifier, a minimum and maximum limiter to the first input of the information separation unit by channels, to the second and third inputs of which, respectively, the output of the resetting pulse shaping unit and the output of the generating unit of clock pulses, to whose inputs at the same time, the first output of the master oscillator is connected, and its second output is connected via the first input and output of the PLL unit to its input, with n outputs of the separation unit and Information on the channels connected to the inputs of the corresponding n recipients of information.

The purpose of the invention is to increase the cryptographic strength of the line while maintaining the reliability of the transmitted information - is achieved by the fact that in the proposed line the output of the unit of formation of personnel pulses is connected to the second input of the radio transmitter through a series-connected pseudo-random sequence generator and phase manipulator, and the output of the receiver linear part is connected to the second input the PLL unit through the first input and output of the block suppressing the amplitude of information pulses above the level of the personnel signal and an input and output of the matched filter, and the limiter output for the minimum and maximum is connected to the second input of the suppression unit for exceeding the amplitude of information pulses above the frame signal level.

FIG. 1 shows a block diagram of the proposed radio telemetry line; FIG. 2-

time diagrams of stresses at characteristic points.

The line contains a transmitting device 1 with information sources 2, a channel switch 3, a VIM signal generation unit 4, a clock pulse generator 5, a personnel emulation unit 6, a pseudo-random sequence generator (PSP) 7, a phase handler 8, a radio transmitter 9, an amplitude module torus 10, receiving device 11 with linear part 12, video detector 13, video amplifier 14, limiter to the minimum and maximum 15, unit 16 for dividing information by channels, block 17 suppressing the amplitude of information Discount pulses above the frame signal, the matched filter 18, the PLL unit 19, the master oscillator 20, reset pulse generating unit 21, clock generating unit 22 imiulsov.

In the transmitting device 1, information sources 2 through a switch of channels 3 are connected via a common line to the input of a VIM signal generating unit 4, the second input of which and one of the switch inputs are connected together and connected to the output of the clock generator 5. The other output of the switch is connected through serially connected blocks forming personnel pulses generator PSP 7 and phase manipulator 8 is connected to one of the inputs of the radio transmitter 9, and the output of the block f is connected to its second input through the amplitude manipulator 10 Setting up a vim signal 4.

In the receiving device 11, the output of the linear part of the receiver 12 is via a serially connected video detector 13, a video amplifier 14 and a limiter for the minimum and maximum 15 connected to one of the inputs of the channel information separation unit 16. The output of the linear part is additionally connected to one of the inputs of block 17 for suppressing the amplitude of information pulses above the frame signal, to the other input of which the output of limiter 15 is connected, and the output of block 17 through matched filter 18 is connected to the input of PLL 19, which is interconnected with the driver the generator 20, and the output of the latter is connected respectively to the inputs of the pulse shaping unit 21 and the clock shaping unit 22, the outputs of which are connected to the corresponding inputs of the block 16 p Thousands separator information channels.

Works telemetry line as follows.

In transmitting device 1, information source 2 signals using a switch of channels 3 are successively converted into a LIMA signal, which comes from the general output of the switch to the input of a VIM signal forming unit 4. To synchronize the operation of blocks 3 and 4, generator 5 generates clock pulses NFo frequency (N-number of information sources, FQ - frequency of polling channels). Unit 6 generates frame pulses that synchronize the operation of the generator PSP 7. The phase manipulator (for example, the manipulator) 8 according to the PSP law controls the phase of the continuous low-power radio signal emitted by the radio transmitter 9.

In order to increase the secrecy of the transmission of a personnel signal (SRP) and, consequently, increase the reliability of the communication line, the length of the SRP must be sufficiently large. The time for its transmission can take several channel intervals and even the entire telemetry frame.

Combined transmission of a personnel signal and information pulses in this case occurs as follows. At the moment the information signal arrives from the output of the amplitude modulator 10, the radio transmitter 9 increases the radiated power in a pulse by m times without changing the phase of the carrier frequency. In the receiving device 11

the selection of information pulses and a personnel signal from the common telemetric signal occurs using two channels. From the output of the linear part of the receiver 12 telemetry signal through the video detector 13

and the video amplifier 14 enters the limiter on the minimum and maximum, 15.

Since the minimum level of restriction is chosen to be significantly greater than the amplitude of the personnel signal (SRP), then at the output of the limiter information pulses are extracted, which enter the information-sharing unit 16 by channel. In addition, they are controlling for block 17 suppression of the amplitude of information pulses above the frame signal level (SRP), the controlled telemetry signal to the input of which is also fed from the output of the linear part of the receiver 12. Due to the fact that the control information pulses synchronously act a full telemetric signal from the output of block 17 is removed, the signal bandwidth, in which the amplitude of information pulses is suppressed to the level of the memory bandwidth without phase distortion

PSP filling frequency. The matched filter 18 generates frame synchronization pulses at the end (before the beginning of the next) frame when it arrives at its input, which are used in the block

PLL 19 for generating the frequency control signal of the master oscillator 20. The oscillator 20 generates a voltage equal to the switching frequency of the N-Fo channels, from which, in block 21, a reset pulse is generated, the frequency of which is equal to the frame synchronization pulse frequency. These pulses, together with the clock pulses taken from the output of block 22, are used in block 16 to divide information into channels.

Subject invention

The radio telemetry line of the decimeter wave band, containing n information sources connected through the n inputs of the channel switch, starting from the second, and its first output to the input of the personnel pulse shaping unit, the clock generator, the output of which is simultaneously connected to the first input of the signal conditioning unit with time - pulse modulation and through the first input and the second output of the channel switch to the second input of the signal conditioning unit with a time-pulse modulus, the output of which through the amplitude the modulator is connected to the first input of the radio transmitter connected by its output to the transmitting antenna; a receiving antenna connected through the linear part of the receiver, a video detector, a video amplifier, a minimum and maximum limiter to the first input of the information separation unit by channels, to the second and third inputs of which, respectively, the output of the resetting pulse shaping unit and the output of the generating unit of clock pulses, to whose inputs at the same time, the first output of the master oscillator is connected, and its second output is connected via the first input and output of the PLL unit to its input, and n outputs of the separation unit Channels are connected to the inputs of the respective n recipients of information, characterized in that, in order to increase the robustness while maintaining the reliability of the transmitted information, the output of the unit of formation of personnel pulses is connected to the second input of the radio transmitter through serially connected pseudo-random sequence generator and phase manipulator, and the output the linear part of the receiver is connected to the second input of the PLL through the first input and the output of the amplitude information block nnyh pulses above the frame signal and the matched filter input and an output, the second input of the amplitude information exceeding the suppression pulses above the frame signal output limiter coupled to the minimum and maximum.

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