RU2549117C1 - Method of transmission by the object of the secret information and device for its implementation - Google Patents

Abstract

FIELD: radio-engineering, communication.

SUBSTANCE: method of secret information transmission by the object means emission of the electromagnetic energy, where object is exposed by receiving-transmitting antennal (RTA1) of radar station (RS1)by continuous signal with frequency modulation under one-side saw-toothed linear law (NLFM signal) that is received by RTA2 of RS2 of the object, directed via two channels, and in one channel NLFM signal is delayed for time tz, and in another channel it passes through the coder generating different NLFM radio pulses with different width corresponding, for example, to dot, hyphen and pause from Morse alphabet, then NLFM signals are summed, reinforced as per power. And via RTA2 are re-transmitted towards RS1, where they are multiplied with the emitted LNLFM signal for further separation at RS1 of two signals with frequencies: Fpi=2DiFmdfm/C±2Vif/C and Fpj=2DiFmdfm/C±2Vif/C+B, where C and Vi are light velocity and speed of approach or divergence of RS1 and RS2; f, Fm and dfm are frequency, modulation frequency and frequency deviation of NLFM signal; B is part of frequency of difference signal due to delay of NLFM signal; Di is distance between radar , and separation of definite difference Δ=Fpi-Fpj=B upon which identification it is assumed that the object transmits the secret information.

EFFECT: expansion of assortment of devices used for information transmission.

2 cl

Description

The invention relates to systems for transmitting classified information.

It is a well-known method of transmitting information using radio pulses, the different durations of which correspond to dots and dashes from Morse code.

Obviously, the security of information transfer from declassification with this method of data transfer is negligible.

The aim of the invention is to expand the range of devices used to transmit information.

The goal is achieved by delaying the FM signal.

When transmitting secret information by an object, it is irradiated from a transmitting and receiving antenna (PPA1) of a radar station (RLS1) with a continuous signal with frequency modulation according to a one-sided sawtooth linear law (NLCM signal), which is received by PPA2 of a radar station of an object, sent through two channels and in one of they are delayed by the NLFM signal for a time t3, and in another they are transmitted through an encoder that generates radio pulses of different durations of NLFM corresponding, for example, to a point, dash and pause from Morse code, after which the NLFM signals comfort, amplified by power and re-emitted through PAPA2 towards RLS1, where they are multiplied with the radiated NLChM signal in order to further isolate two signals with frequencies at FPS1: Fpi = 2DiFmdfm / C ± 2Vif / C and Fpj = 2DiFmdfm / C ± 2Vif / C + B, where C and Vi are the speed of light and the speed of approach or divergence of radar1 and radar2; f, Fm and dfm are the frequency, modulation frequency and frequency deviation of the LFLM signal; B is the part of the frequency of the difference signal that occurs due to the delay of the NLFM signal; Di is the distance between the radar antennas and the allocation of the known difference Δ = Fpi-Fpj = B, upon detection of which it is believed that the object transmits classified information.

A device for transmitting classified information by an object contains a radar station 1 and a radar station 2 mounted on the object, while the radar station 1 contains an NLFM transmitter, the output of which is connected to the input of the transmitter 1, which is transmitting, and its low-power output, through the first mixer (SM1), to the inputs of the first and second differential frequency filters (PSF1 and PSF2), the second input SM1 is connected to the input of PSA1, which works at the reception, the outputs of PSF1 and PSF2, through SM2 and then through the PSP, is connected to the decoder, and radar2 contains PSA2, the input of which is working at the receive, through the encoder as well as through element h Derzhko, connected to the inputs of the adder, the output of which via the power amplifier (PA) connected to the input PPA2 running on it.

Consider the operation of a device for transmitting classified information by an object.

Radar1, containing a transmitter for NLFM signal, ППА1, СМ1, ФРЗ1 and ФРЗ2, is a frequency radio range finder in which the value of the frequency of the signal at the outputs of the ФРЧ corresponds to the range between ППА1 and ППА2. The emitted PAPA 1 NLFM signal is received by PAP2 at the facility, passed through an encoder (key) and converted into radio pulses with durations corresponding, for example, to points and dashes from Morse code, and pauses between them. In addition, the received radar NLCM signal is delayed by a delay element for a time tz. Next, the encoded and delayed NLFM signals are summed by the adder, amplified by PA, and re-emitted through PAP2 toward PAP1. The re-emitted NLFM radar signals received at RLS1 are multiplied with the emitted NLFM signal in SM1 and then the differential signals with frequencies Fpi and Fpj are extracted, which are multiplied into SM2 and then the known frequency difference Δ = Fpi-Fpj pulse representing the frequency difference Δ = Fpi-pulse representing B, representing durations corresponding to dots and dashes, which, passing through the HDF and the decoder, are decoded for further display.

Obviously, without knowing the delay time t3, it will not be possible to decrypt the transmitted information.

Claims (2)

1. The method of transmitting secret information by an object, which consists in emitting electromagnetic energy, characterized in that the object is irradiated from a transceiver antenna (PAP1) of a radar station (RLS1) with a continuous signal with frequency modulation according to a one-sided sawtooth linear law (NLFM signal), which is adopted PPA2 radar2 of the object is sent through two channels and in one of them they delay the NLFM signal for a time t3, and in the other they pass through an encoder that generates radio pulses of different durations of NLFM, corresponding, for example er, point, dash, and pause from the Morse code, after which the NLFM signals are summed up, amplified in power, and re-emitted through PAP2 towards RLS1, where they are multiplied with the emitted NLFM signal in order to further isolate two signals with frequencies: Fpi = 2DiFmdfm / C ± 2Vif / C and Fpj = 2DiFmdfm / C ± 2Vif / C + B, where C and Vi are the speed of light and the speed of approach or divergence of RLS1 and RLS2; f, Fm and dfm are the frequency, modulation frequency and frequency deviation of the LFLM signal; B is the part of the frequency of the difference signal that occurs due to the delay of the NLFM signal; Di is the distance between the radar antennas and the allocation of the known difference Δ = Fpi-Fpj = B, upon detection of which it is believed that the object transmits classified information. 2. A device for transmitting classified information by an object containing a radar station (RLS1) and RLS2 installed on an object, characterized in that the RLS1 contains a continuous signal transmitter with frequency modulation according to a one-sided sawtooth linear law (NLFM signal), the powerful output of which is connected to the input of the first a transmitter-receiver antenna (PAP1) operating on the transmission, and its low-power output, through the first mixer (CM1), to the inputs of the first and second difference frequency filters (PSF1 and PSF2), the second input CM1 is connected to the input of PPA1, operating at the reception, the outputs of the RFF1 and HPF2, through SM2 and further through the FedChZ, are connected to the decoder, and the radar2 contains the PAP2, the input of which, operating at the receive, through the encoder, as well as in parallel through the delay element, is connected to the inputs of the adder, the output of which, through a power amplifier, connected to the input of the PPA2, working on the transmission.