RU2723928C1 - Computer system for remote control of navigation systems for automated monitoring of environment in arctic conditions - Google Patents

Abstract

FIELD: physics.SUBSTANCE: disclosed system relates to the field of automated monitoring of the environment in Arctic conditions, specifically the state of the atmosphere and ice with simultaneous determination of the coordinates of the navigation systems own location and transmission of the received information over radio channels, and can be used as an environment monitoring device in the ice movement area for safe navigation of vessels along the northern sea route and provision of safety of oil-and-gas field objects and hydraulic engineering infrastructure on shelf and in coastal zone in Arctic seas and in conditions of ice cover, including drifting. Computer system for remote control of navigation systems for automated monitoring of the environment in Arctic conditions comprises a dispatcher station (DP), navigation systems (HKi, i = 1, 2, …, n) and satellite communication system (SC) space vehicles. Each transceiving device 1 (1.i) comprises control unit (2i), computer 3 (3.i), driving oscillator 4 (4.i), modulator code generator (5i) (5.i), phase manipulator 6 (6.i), first heterodyne 7 (7.i), first mixer 8 (8.i), amplifier 9 (9.i) first intermediate frequency, first power amplifier 10 (10.i), duplexer 11 (11.i), transceiving antenna 12 (12.i), second power amplifier 13 (13.i), second heterodyne 14 (14.i), second mixer 15 (15.i), amplifier 16 (16.i) a second intermediate frequency, multiplier 17 (17.i), band-pass filter 18 (18.i), phase detector 19 (19.i), receiving antenna 20.i, GPS signal receiver 21.i, ice thickness measurement unit 22.i, atmospheric state measurement unit 23.i, underwater navigation beacon 24.i, oscillatory circuit 25 (25.i), narrow-band filter 26 (26.i), amplitude detector 27 (27.i), threshold unit 28 (28.i) and switch 29 (29.i).EFFECT: technical problem of the invention is high selectivity, noise immunity and reliability of duplex radio communication between the control centre and navigation systems by suppressing false signals (interference) received over additional channels.1 cl, 4 dwg

Description

The proposed system relates to the field of automated environmental monitoring in the Arctic, namely the state of the atmosphere and ice with the simultaneous determination of the coordinates of the navigation system’s own location and the transmission of received information via radio channels, and can be used as a means of environmental monitoring in the ice movement zone for safe pilotage of vessels along the Northern Sea Route and ensuring the safety of oil and gas and hydraulic infrastructure facilities on the shelf and in the coastal zone in the arctic seas and under ice cover, including drift.

Known systems for monitoring the state of ice and the environment (ed. Certificate of the USSR No. 1.151.107, 1.341.594, 1.376.769, 1.788.487, 1.840.717; RF patents No. 2.080.620, 2.137.153, 2.196. 347, 2.251.128, 2.436.134, 2.449.326, 2.486.471, 2.487.365, 2.500.031, 2.583.234, 2.681.671; U.S. Patent Nos. 3,449,950, 4,231,039, 4,527,160, 4.608.568, 7.969.827; UK patents Nos. 1,494.582, 1.499.388, 2.122.834; French patents Nos. 2,384.218, 2,592.959; German patents Nos. 2,800.074, 2.802.918; Vaulin U .V. Et al. The navigation complex of an autonomous underwater robot and the features of its application in the Arctic. Navigation, control and communications, 2008, No. 1 (5), pp. 24-31 and others).

Of the known systems, the closest to the proposed one is “A computer system for remote control of navigation systems for automated environmental monitoring in the Arctic” (RF patent No. 2.681.671, G01C 21/00, 2017), which is chosen as a prototype.

The specified system provides the operational exchange of discrete information between the control center and navigation systems. This is achieved through duplex radio communications using complex phase-shift signals, computers and spacecraft of the satellite communications system as repeaters.

The composition of the known system includes superheterodyne receivers in which the same value of the second intermediate frequency ω _pr2 can be obtained by receiving signals at the following frequencies: ω ₁ , ω ₂ , ω _z1 , ω _z2 , i.e.

_np2 ω = ω ₁ -ω _{r1, np2} ω = ω -ω _{r1 P1,}

_np2 ω = ω _z2 -ω _2, ω = ω _{s2 np2 z2} -ω.

Therefore, if the tuning frequencies ω ₁ and ω _{2 are} taken as the main reception channels, then along with them there are mirror receiving channels, the frequencies ω _z1 and ω _{z2 of} which are located symmetrically (mirror) with respect to the frequencies ω _g1 and ω _{g2 of the} first and second local oscillators ( Fig. 4). The conversion of the mirror channels of the reception occurs with the same conversion coefficient K _ol that the main channels. Therefore, mirror reception channels most significantly affect the selectivity and noise immunity of superheterodyne receivers.

In addition to mirrored, there are other additional (combination) reception channels.

In general terms, any combination receive channel takes place when the following conditions are met:

ω _pr2 = | ± mω _ki ± nω _g1 |,

ω _pr2 = | ± mω _Kj ± nω _r2 |,

where ω _ki , ω _kj are the frequencies of the i-th and j-th Raman reception channels;

m, n, i, j are positive integers.

The most harmful combinational reception channels are those generated by the interaction of the first harmonic of the signal frequency with the harmonics of the frequencies of small local oscillators (second, third), since the sensitivity of the receivers on these channels is close to the sensitivity of the main channels.

So, four combinational reception channels with m = 1 and n = 2 correspond to frequencies:

ω _k1 = 2ω _{g1 -ω pr2} , ω _k2 = 2ω _g1 + ω _pr2 ,

_k3 = 2ω ω _z2 -ω _np2, ω _{z2 k4} = 2ω + ω _np2,

where 2ω _g1 , 2ω _g2 are the second harmonics of the frequencies of the first and second local oscillators.

The presence of false signals (interference) received via mirror and Raman channels leads to a decrease in the selectivity, noise immunity and reliability of duplex radio communication between the control center and navigation systems.

An object of the invention is to increase the selectivity, noise immunity and reliability of duplex radio communication between the control center and navigation systems by suppressing false signals (interference) received via additional channels.

The problem is solved in that a computer system for remote control of navigation systems for automated environmental monitoring in the Arctic, containing, in accordance with the closest analogue, at least three navigation systems, each of which is characterized by the presence of surface and underwater sections connected by cable, while the above-water part contains a control unit, a unit for determining coordinates by a satellite navigation system, a unit for determining the state of the atmosphere connected to a transceiver device, and the underwater part contains an underwater navigation beacon, control inputs of a unit for determining coordinates by a satellite navigation system, a unit for determining ice thickness, a determination unit the state of the atmosphere and the underwater navigation beacon are connected to the corresponding outputs of the control unit, a transceiver installed at the control center, and spacecraft of the satellite communication system, while each transceiver device is made in the form of a master oscillator, a phase manipulator, connected in series to the output of the computer control unit, the second input of which is connected to the second output of the computer, the first mixer, the second input of which is connected to the output of the first local oscillator, the amplifier of the first intermediate frequency, the first power amplifier, a duplexer, the input-output of which is connected to the transceiver antenna, the second power amplifier, the second mixer, the second input of which is connected to the output of the second local oscillator and the second intermediate frequency amplifier, series-connected multiplier, the second input of which is connected to the output of the first local oscillator, strip filter and phase detector, the second input of which is connected to the output of the second local oscillator, and the output is connected to a computer, the frequencies ω _r1 and ω _{r2 of the} local oscillators are spaced by the value of the second intermediate frequency

w _{r1 r2} -ω = ω _WP2,

the control unit transceiver emits complex signals with phase shift keying at a frequency

ω = ω ₁ = ω _{z2 pr1,}

where ω _pr1 - the first intermediate frequency, and takes on the frequency

ω ₂ = ω _pr3 = ω _g1 ,

where ω _CR3 is the third intermediate frequency, and the transceiver devices of the navigation systems, on the contrary, emit complex signals with phase shift keying at the frequency ω ₂ , and receive - at frequency ω ₁ , spacecraft of the satellite communication system relay complex signals with phase shift keying at frequencies ω ₁ and ω ₂ while maintaining phase relationships, differs from the closest analogue in that each transceiver is equipped with an oscillating circuit, a narrow-band filter, an amplitude detector, a threshold block and a key, and an oscillating circuit is connected in series to the output of the second power amplifier, the second input of which is connected to the output the first local oscillator, a narrow-band filter, an amplitude detector, a threshold block and a key, the second input of which is connected to the output of the amplifier of the second intermediate frequency, and the output is connected to the first input of the multiplier.

The geometrical layout of the control center (DP), navigation systems (HKi, I = 1, 2, ..., n) and spacecraft (SC) of the satellite communications system is shown in FIG. 1. The structural diagram of the transceiver device 1 installed on the control center DP, is presented in FIG. 2. The structural diagram of the transceiver device 1.i installed on the i-th navigation complex is shown in FIG. 3. A frequency diagram illustrating frequency conversion of signals is shown in FIG. 4.

Each transceiver 1 (1.i) is made in the form of series-connected control unit 2 (2.i), computer 3 (3.i), master oscillator 4 (4.i), phase manipulator 6 (6.i), the second the input of which through the generator 5 (5.i) of the modulating code is connected to the second output of the computer 3 (3.i), the first mixer 8 (8.i), the second input of which is connected to the output of the first local oscillator 7 (7.i), amplifier 9 (9.i) the first intermediate frequency, the first power amplifier 10 (10.i), the duplexer 11 (11.i), the input-output of which is connected to the transceiver antenna 12 (12.i), the second amplifier 13 (13.i) power, the second mixer 15 (15.i), the second input of which is connected to the output of the second local oscillator 14 (14.i), the amplifier 16 (16.i) of the second intermediate frequency, key 29 (29.i), the multiplier 17 (17. i), the second input of which is connected to the output of the first local oscillator 7 (7.i), the bandpass filter 18 (18.i) and the phase detector 19 (19.i), the second input of which is connected to the output of the second local oscillator 14 (14 .i), and the output is connected to the second input of computer 3 (3.i). An oscillatory circuit 25 (25.i) is connected in series to the output of the second power amplifier 13 (13.i), the second input of which is connected to the output of the first local oscillator 7 (7.i), a narrow-band filter 26 (26.i), and an amplitude detector 27 ( 27.i) and a threshold block 28 (28.i), the output of which is connected to the second input of the key 29 (29.i).

Block 2 (2.i) can be made on the basis of a microprocessor. Block 21.i determine the coordinates of the satellite navigation system can be performed on the basis of satellite navigation systems GPS and GLONASS and is a receiver 21.i GPS signals with a receiving antenna 20.i. The ice cover thickness measuring unit 22.i may be performed on the basis of an ultrasonic thickness gauge. As the unit 23.i measuring the state of the atmosphere can be used in the measuring unit of the weather balloon.

Preferably, the complex uses a power supply unit configured to recharge. In this case, the complex further comprises an electric energy generator connected to the input of the power supply unit. As the specified generator, a wind generator or a generator using a thermocouple can be used.

In some embodiments, an atmospheric condition determination unit 23.i is configured to determine wind speed, temperature, and air humidity.

The boom on which the underwater navigation beacon 24.i is mounted can be used as a means of measuring ice thickness. In addition, one of the thermocouple elements can be fixed on the rod (the second element is located above the ice surface), while the electric charge generated by the thermocouple enters the battery. The mast of the wind generator can be additionally used as an antenna of transceiver devices.

Each used complex has its own individual code (identification number - ID), which is given in all radiograms sent by the complex.

The joint use of at least three navigation systems provides orientation in the space of an underwater vehicle of any type.

Navigation systems provide the following functions:

- giving signals to underwater navigation;

- reception of signals from navigation satellite constellations;

- parallel measurements of ice thickness;

- transmission (via satellite channels) of the collected data on-line (at a given time);

- about own coordinates at present;

- about the thickness of the ice on which they are currently located;

- about wind speed, pressure and humidity and temperature (if necessary).

The installation and use of the complexes at a given distance provides the opportunity to create a network of information systems in the system for monitoring the movement of ice and its condition, for the safe escort of vessels along the Northern Sea Route and for ensuring the safety of oil and gas production and hydraulic infrastructure on the shelf and in the coastal zone in the arctic seas and in conditions ice cover, including drift. In addition, the installation and use of complexes at a given distance provide the ability to create a network of underwater navigation.

The main feature of the system created by using ice-mounted complexes is the ability to provide accurate technical control of the ice state and its thickness, which allows using special software products to accurately predict the time and quality of formation of hummocks, ice displacement and the formation of ice conditions impassable for the icebreaker fleet . In addition, the system of these complexes provides underwater navigation.

The proposed system works as follows.

In order to transmit the necessary control information to the selected navigation complex HKi (i = 1, 2, ..., n) at the control center DP 1, using the control unit 2 and computer 3, the master oscillator 4 is turned on, which generates a high-frequency harmonic oscillation

u _c (t) = U _c ⋅ Cos (ω _c t + ϕ _s ), 0≤t≤T _s ,

where U _c , ω _s , ϕ _s , T _s - amplitude, carrier frequency, initial phase and duration of harmonic oscillation, which is fed to the first input of the phase manipulator 6, the second input of which is supplied with the modulating code M ₁ (t) from the second output of the computer 3. The specified modulating code corresponds to the identification number of the requested navigation system. The output of the phase manipulator 6 produces a complex signal with phase shift keying (PSK)

u ₁ (t) = U ₁ ⋅ Cos [ω _c t + ϕ _k1 (t) + ϕ _s ], 0≤t≤T _s ,

where ϕ _k1 (t) = {0, π} is the manipulated phase component that displays the law of phase manipulation in accordance with the modulating code M ₁ (t), and ϕ _k1 (t) = const for Kτ _e <t <(k + 1) τ _e and can change abruptly at t = kτ _e , i.e. at the borders between elementary premises (k = 1, 2, ..., N-1); τ _e , N is the duration and number of chips that make up the signal with a duration of T _s (T _s = τ _e ⋅ N).

This signal is fed to the first input of the first mixer 8, the second input of which is supplied with the voltage of the first local oscillator 7

u _g1 (t) = U _g1 ⋅ Cos (ω _g1 t + ϕ _g1 ).

The output of the mixer 8 is formed voltage Raman frequencies. Amplifier 9 is allocated the voltage of the first intermediate (total) frequency

u _CR1 (t) = U _{CR1 ⋅} Cos [ω _CR1 t + ϕ _K1 (t) + ϕ _CR1 ], 0≤t≤T _c ,

ω _pr1 = ω _c + ω _g1 = ω ₁ - the first intermediate (total) frequency;

ϕ _pr1 = ϕ _s + ϕ _g1 ,

which, after amplification in the power amplifier 10 through the duplexer 11 enters the transceiver antenna 12, is radiated by it at the frequency ω ₁ into the air (in the direction of the navigation systems), through the KA-transponders, is captured by the transceiver antenna 12.i of the navigation complex and through the duplexer 11.i and the power amplifier 13.i is supplied to the first input of the mixer 15.i, to the second input of which the local oscillator voltage 14.i

u _g1 (t) = U _g1 ⋅ Cos (ω _g1 t + ϕ _g1 ).

At the output of the mixer 15.i, voltages of combination frequencies are generated. Amplifier 16.i isolates the voltage of the second intermediate (differential) frequency

u _CR2 (t) = U _{CR2 ⋅} Cos [ω _CR2 t + ϕ _K1 (t) + ϕ _CR2 ], 0≤t≤T _s ,

ω _pr2 = ω _{pr1 -ω g1} - the second intermediate (difference) frequency;

ϕ _ad2 = ϕ _ad1 -ϕ _g1 .

At the same time, the voltage u _pr1 (t) from the output of the power amplifier 13.i is supplied to the first input of the oscillating circuit 25.i, to the second input of which the local oscillator voltage 7.i

u _z2 (t) = U _r2 ⋅Cos (ω t + φ _{r2 r2).}

Tuning frequency ω _2n oscillation circuit 25.i and 26.i narrowband filter is selected equal to the frequency ω LO _r2 7.i (ω _2n = ω _z2). When the voltage u _pr1 (t) is _supplied to the first input of the oscillating circuit 25.i, a resonance phenomenon occurs in it.

The output voltage of the oscillating circuit 25.i is allocated by a narrow-band filter 26.i, detected by the amplitude detector 27.i and fed to the input of the threshold unit 28.i, where it is compared with the threshold voltage U _then .

When the output voltage of the oscillating circuit 25.i and the narrow-band filter 26.i resonate, they reach their maximum value, the output voltage of the amplitude detector 27.i also reaches the maximum value U _max and exceeds the threshold level U _then in the threshold block 28.i (U _max > U _then ) And only when the threshold level U _pores is exceeded, a constant voltage is generated in the threshold block 28.i, which is supplied to the control input of the key 29.i, opening it. In the initial state, the key 29.i is always closed. In this case, the voltage u _pr2 (t) from the output of the amplifier 16.i of the second intermediate frequency through the public key 29.i is supplied to the first input of the multiplier 17.i, the second input of which supplies the local oscillator voltage 7.i

u _z2 (t) = U _r2 ⋅Cos (ω t + φ _{r2 r2).}

At the output of the multiplier 17.i, a voltage is generated

u ₂ (t) = U ₂ ⋅ Cos [ω _g1 t-ϕ _k1 (t) + ϕ _g1 ], 0≤t≤T _s ,

w _{r1 r2} = ω -ω _WP2,

which is an FMN signal at a frequency ω _{g1 of the} local oscillator 14.i. This voltage is allocated by the bandpass filter 18.i and fed to the first (information) input of the phase detector 19.i, to the second (reference) input of which the voltage U _g1 (t) of the local oscillator 14.i is applied. A low-frequency voltage is generated at the output of the phase detector 19.i

u _н1 (t) = U _н1 ⋅ Cosϕ _к1 (t), 0≤t≤T _s ,

proportional to the modulating code M ₁ (t). This voltage goes to computer 3.i.

The frequencies ω _g1 and ω _g2 local oscillators are spaced by the value of the second intermediate frequency (Fig. 4)

w _{r1 r2} -ω = ω _WP2.

If the identification number M _and (t) of the requested navigation system corresponds to the modulating code M ₁ (t), then a command is generated in computer 3.i that, through the control unit 2.i, acts on the blocks 21.i, 22.i and 23.i including them. In this case, information from the indicated blocks is transmitted through the computer 3.i to the input of the generator 5.i of the modulating code, where the total modulating code is generated:

M _Σ (t) = M _and (t) + M ₂ (t) + M ₃ (t) + M ₄ (t),

where M _and (t) is the identification number of the navigation complex;

M ₂ (t) is a modulating code that displays the coordinates (longitude and latitude) of the navigation complex;

M ₃ (t) is a modulating code that displays the thickness of the ice;

M ₄ (t) is a modulating code that displays wind speed, temperature and humidity.

At the same time, the master oscillator 4.i is turned on, which generates a high-frequency harmonic oscillation

u _ci (t) = U _ci ⋅ Cos (ω _c t + ϕ _ci ), 0≤t≤T _ci ,

which arrives at the first input of the phase manipulator 6.i, the second input of which from the output of the generator 5.i of the modulating code receives the total modulating code M _Σ (t).

At the output of the phase manipulator 6.i, a complex PSK signal is formed

u _3i (t) = U _3i ⋅ Cos [ω _c t + ϕ _k2 (t) + ϕ _ci ], 0≤t≤T _ci ,

where ϕ _k2 (t) = {0, π} is the manipulated component of the phase, which displays the law of phase manipulation in accordance with the total modulating code M _Σ (t),

which goes to the first input of the mixer 8.i, to the second input of which the local oscillator voltage 7.i

u _z2 (t) = U _r2 ⋅Cos (ω t + φ _{r2 r2).}

At the output of the mixer 8.i, voltages of combination frequencies are generated. Amplifier 9.i isolates the voltage of the third intermediate frequency

u _pr3 (t) = U _{pr3 ⋅} Cos [ω _pr3 t-ϕ _k2 (t) + ϕ _pr3 ], 0≤t≤T _ci ,

_PR3 ω = ω _z2 -ω _with - third intermediate frequency;

_PR3 cp = φ -φ _{r2 ci,}

which after amplification in the power amplifier 10.1 through the duplexer 11.i enters the transceiver antenna 12.i, is radiated by it at the frequency ω ₂ into the air (in the direction of the spacecraft), re-emitted by it in the direction of the control center DP, is captured by the transceiver antenna 12 and through the duplexer 11 and the power amplifier 13 is supplied to the first input of the mixer 15, to the second input of which the voltage of the local oscillator 14

u _z2 (t) = U _r2 ⋅Cos (ω t + φ _{r2 r2).}

The output of the mixer 15 is formed voltage Raman frequencies. The amplifier 16 is allocated the voltage of the second intermediate (differential) frequency

u _CR4 (t) = U _{CR4 ⋅} Cos [ω _CR2 t + ϕ _K2 (t) + ϕ _CR2 ], 0≤t≤T _s ,

_np2 ω = ω _z2 -ω _PR3 - second intermediate (difference) frequency;

_WP2 cp = φ -φ _{r2 PR3.}

Simultaneously, the voltage u _CR3 (t) from the output of the power amplifier 13 is supplied to the first input of the oscillating circuit 25, the second input of which is the voltage of the local oscillator 7

u _g1 (t) = U _g1 ⋅ Cos (ω _g1 t + ϕ _g1 ).

The tuning frequency ω _{n1 of the} oscillating circuit 25 and the narrow-band filter 26 is chosen equal to the frequency ω _{g1 of the} local oscillator 7 (ω _n1 = ω _g1 ). When the voltage u _pr3 (t) is _supplied to the first input of the oscillating circuit 25, a resonance phenomenon arises in it.

The output voltage of the oscillating circuit 25 is extracted by a narrow-band filter 26, detected by the amplitude detector 27 and fed to the input of the threshold unit 28, where it is compared with the threshold voltage U _then .

At resonance, the output voltages of the oscillating circuit 25 and the narrow-band filter 26 reach a maximum value, the output voltage of the amplitude detector 27 also reaches a maximum value of U _max and exceeds the threshold level U _pores in the threshold unit 28 (U _max > U _pores ). And only when the threshold level U _then is exceeded in the threshold unit 28, a constant voltage is generated, which is supplied to the control input of the key 29, opening it. In the initial state, the key 29 is always closed. In this case, the voltage u _pr4 (t) from the output of the amplifier 16 of the second intermediate frequency through the public key 29 is supplied to the first input of the multiplier 17, the second input of which is supplied with the voltage u _g1 (t) of the local oscillator 7. A voltage is generated at the output of the multiplier 17

u ₄ (t) = U ₄ ⋅Cos [ω t + φ _{r2 k2} (t) + φ _r2] 0≤t≤T _s,

ω = ω _z2 -ω _{np2 r1;}

cp _r2 = φ -φ _{pr1 r1,}

which is allocated by a band-pass filter 18 and fed to the first (information) input of the phase detector 19, to the second (reference) input of which the voltage u _g2 (t) of the local oscillator 14 is supplied. A low-frequency voltage is generated at the output of the phase detector 19

u _n2 (t) = U _n2 ⋅ Cosϕ _k2 (t), 0≤t≤T _s ,

proportional to the total modulating code M _Σ (t). This voltage goes to computer 3.

The operation of superheterodyne receivers described above corresponds to the case of receiving useful PSK signals on the main channels at frequencies ω ₁ and ω ₂ (Fig. 4).

If a false signal (interference) enters the first mirror channel at a frequency of ω _s1

_Z1 u (t) = U _Z1 ⋅Cos (ω t + φ _{P1 P1),} 0≤t≤T _P1,

the output from the power amplifier 13.i it enters the first input oscillation circuit 25.i, the tuning frequency ω _2n is chosen equal to the frequency ω LO _r2 7.i (ω _2n = ω _z2). The frequencies ω _P1 and ω _z2 are spaced by twice the value of the second intermediate frequency ω _z2 -ω _P1 = 2ω _np2. Therefore, the resonance phenomenon does not occur in the oscillating circuit 25.i, the output voltage U of the amplitude detector 27.i does not exceed the threshold level in the threshold unit 28.i (U <U _pop ). The key 29.i does not open and the false signal (interference) u _s1 (t), arriving through the first mirror channel at a frequency ω _s1 , is suppressed.

If a false signal (interference) enters the second mirror channel at a frequency of ω _s2

u _s2 (t) = U _s2 ⋅Cos (ω t + φ _{s2 s2)} 0≤t≤T _s2,

then it comes from the output of the power amplifier 13 to the first input of the oscillating circuit 25, the tuning frequency ω _{n1 of} which is chosen equal to the frequency ω _{g1 of the} local oscillator 7 (ω _n1 = ω _g1 ). The frequencies ω _d1 and ω _s2 are spaced by twice the value of the second intermediate frequency ω _s2 = 2ω -ω _{r1 np2.} Therefore, the resonance phenomenon does not occur in the oscillating circuit 25, the output voltage U of the amplitude detector 27 does not exceed the threshold level U _then in the threshold unit 28 (U <U _then ). The key 29 does not open and a false signal (interference) arriving through the second mirror channel at a frequency ω _s2 is suppressed.

For a similar reason, false signals (interference) received on other additional (along the first ω _k1 , second ω _k2 , third ω _k3 , fourth ω _k4 combination) channels are also suppressed.

The proposed system provides the ability for remote automated environmental monitoring in large areas in the Arctic and the operational exchange of discrete information between the control center and navigation systems. This is achieved through duplex radio communications using complex signals with phase shift keying, computers and spacecraft satellite communications systems as repeaters.

Complex PSK signals have high energy and structural secrecy.

The energy secrecy of these signals is due to their high compressibility in time and spectrum with optimal processing, which reduces the instantaneous radiated power. As a result, a complex PSK signal at the receiving point may be masked by noise and interference. Moreover, the energy of a complex PSK signal is by no means small, it is simply evenly distributed over the time-frequency domain so that at each point in this region the signal power is less than the power of noise and interference.

The structural secrecy of complex PSK signals is caused by a wide variety of their forms and significant ranges of parameter changes, which makes it difficult to optimize or at least quasi-optimal processing of complex PSK signals of an a priori unknown structure in order to increase the sensitivity of receivers.

Thus, the proposed system in comparison with the prototype and other technical solutions for a similar purpose provides increased selectivity, noise immunity and reliability of duplex radio communications between the control center and navigation systems. This is achieved by suppressing false signals (interference) received via additional channels. Moreover, to suppress false signals (interference) received via mirror and Raman channels, oscillatory circuits that implement the resonance phenomenon are used.

It should be noted that the phenomenon of resonance is a fundamental principle of operation of many systems and devices of radio electronics.

Claims (7)

A computer system for remote control of navigation systems for automated environmental monitoring in the Arctic, containing at least three navigation systems, each of which is characterized by the presence of surface and underwater sections connected by a cable, while the surface part contains a control unit, an ice thickness thickness determination unit, a unit determining the state of the atmosphere connected to the transceiver device, and the underwater part contains an underwater navigation beacon, the control inputs of the coordinate determination unit for the satellite navigation system, the ice cover thickness determination unit, the atmosphere state determination unit and the underwater navigation beacon are connected to the corresponding outputs of the control unit, the transceiver installed at the control room and spacecraft of the satellite communication system, with each transceiver device made in the form of series-connected to the output of the unit the control of the computer, the master oscillator, the phase manipulator, the second input of which is connected to the second output of the computer through the generator of the modulating code, the first mixer, the second input of which is connected to the output of the first local oscillator, the amplifier of the first intermediate frequency, the first power amplifier, duplexer, the input-output of which is connected with a transceiver antenna, a second power amplifier, a second mixer, the second input of which is connected to the output of the second local oscillator and of the second intermediate frequency amplifier, multipliers connected in series, the second input of which is connected to the output of the first local oscillator, bandpass filter and phase detector, the second input of which is connected to the output the second local oscillator, and the output is connected to a computer, the frequencies ω _g1 and ω _g2 local oscillators are spaced by the value of the second intermediate frequency w _{r1 r2} -ω = ω _WP2, the control unit transceiver emits complex signals with phase shift keying at a frequency ω = ω ₁ = ω _{z2 pr1,} where ω _pr1 - the first intermediate frequency, and takes on the frequency ω ₂ = ω _pr3 = ω _g1 , where ω _CR3 is the third intermediate frequency, and the transceiver of the navigation systems, on the contrary, emits complex signals with phase shift keying at the frequency ω ₂ , and receives at frequency ω ₁ , spacecraft of the satellite communications system relay complex signals with phase shift keying at the frequency ω ₁ and ω ₂ with preserving phase relations, characterized in that each transceiver is equipped with an oscillating circuit, a narrow-band filter, an amplitude detector, a threshold block and a key, and an oscillatory circuit is connected in series to the output of the second power amplifier, the second input of which is connected to the output of the first local oscillator, narrow-band a filter, an amplitude detector, a threshold block and a key, the second input of which is connected to the output of the amplifier of the second intermediate frequency, and the output is connected to the first input of the multiplier.

Images