The wireless link connection with the spatial signal separation

 

(57) Abstract:

The wireless link connection with the spatial separation of the signal relates to the field of discrete information transmission and can be used in radio channels to transmit information in communication with moving objects, and Vice-duplex radio control and packet radio networks operational command transmission in unprotected areas. Technical result achieved - increased noise immunity and secrecy of the transmitted information. This wireless link connection comprises a generator of oscillations of the carrier and clock frequencies, the pseudo-random sequence generator (HPG), the shaper orthogonal SRP (FOPP), two devices phasing, four multipliers, two phase shifter 90, the phase manipulator, power splitter, anti-phase amplifier, the first and second irradiators transmitting antenna, a phase detector, the first and second agents of the receiving antenna, the device rotation of polarization, adder, subtractive device, narrowband low-pass filter, the amplitude limiter, a synchronous detector, the first and second correlators, mixer and local oscillator. 3 Il.

The proposed device on the I transfer information in connection with moving objects, and in reverse duplex radio control and packet radio networks operational command transmission in unprotected areas.

Known communication systems with noise-like signals, such as and.with. N 651492, which serves for transmission of discrete information.

The main disadvantage of this system is the low immunity in conditions of interference with a concentrated spectrum, which is caused by neoptimalizovat algorithm signal processing with respect to such interference.

Also known broadband communication system with PSS (see L. E. Varakin "communication Systems with noise-like signals", M, "P and C", 1985, page 16, Fig. 1.7), intended for the transmission of discrete messages. Since this device is a consistent filter, this unit is practically possible only incoherent reception of orthogonal signals that lead to low noise immunity information, because the higher the immunity provided for coherent reception and use of orthogonal signals. In addition, the practical implementation of the matched filter at the large bases of the signal represents a technical challenge.

Functional diagram of the device of the prototype is shown in Fig. 1, where we have introduced the following notation:

1 is a generator of oscillations of the carrier and clock frequencies;

2 - shaper orthogonal pseudo-random sequence;

3 is a pseudo - random sequence generator;

4 - unit phasing;

5, 6, the first and second multiplier;

7 - Phaser 90o;

8 - phase manipulator;

9 is a diagram of the addition;

10, 11, the first and second multiplier products;

12 - shaper orthogonal pseudo-random sequence;

13 - reference generator pseudo-random sequence;

14 - device phasing;

15 - device synchronization;

16, 17, the first and second bandpass filters;

18 is a phase detector.

The device prototype has the following functional relationships. On the transmitting side of the generator carrier and clock frequencies GNTC one output connected to the first inputs of the former (orthogonal SRP - POP and pseudo-random sequence generator - GP, the second inputs of which are connected to the outputs of block phasing 4, the outputs POP and GP respectively through the first 5 and Voronin with the second input of the first multiplier 5, and through phase arm 8 to the second input of the second multiplier 6; at the receiving side, the receiver input is connected to the input of the synchronizer 15 and inputs the first 10 and second 11 multiplier products, the output of the synchronizer 15 is connected to the inputs FOPP and GAP, the second inputs of which are connected to the outputs of block 14 phasing, the outputs of the first 10 and second 11 multiplier products respectively through the first 16 and second 17 bandpass filters connected to the inputs of phase detector 18, the output POP connected with the second input of the first multiplier 10, and the output GAP connected to the second input of the second multiplier 11.

Function prototype as follows.

In the transmitter GNTC generates two frequencies: a clock for POP and GPP and the carrier frequency signal. Clocked output GNTC arrives at the inputs of POP and GPP that produce binary pseudo-random sequence - SRP. These SRP represent sets of bipolar pulses of direct current of the same magnitude duration, which is determined by the clock frequency. The laws of formation of the SRP shall be such to ensure low cross-correlation between the pseudo-random sequences FOPP and GPP when either the division and suppression of the echo signals in the receiver.

The device phasing 4 sets shift registers POP and GPP in the same initial state, so that the communication phase of their pseudorandom sequences. The device phasing 4 consists of decoders initial States FOPP and GPP and pulse phasing scheme, which provides a combination of initial conditions in phase. Binary SRP output FOPP is supplied to the multiplier 5. To the second input of the multiplier through the phase shifter 90o7 output GNTC comes oscillation of the carrier frequency, which in the multiplier 5 multiplies the binary SRP. As a result, the output of the multiplier 5 is formed a signal representing the oscillation of the carrier frequency with a constant amplitude, phase modulated 180oby law, the binary SRP.

Binary SRP output GPP is supplied to the multiplier 6, the second input is through the phase manipulator 8 output GNTC comes oscillation of the carrier frequency. At the output of the multiplier 6 is formed a signal representing the oscillation of the carrier frequency with a constant amplitude shift keyed phase by 180oby law, the binary SRP. Depending on the sign of the transmitted information phase arm 8 carries on the 0 or 180o. Thus, depending on the sign of information transmitted carrier frequencies of these signals are shifted from each other in phase.

From the outputs of the multipliers 5 and 6, the signal at the circuit adding 9, which forms an output signal representing the oscillation of the carrier frequency with a constant amplitude shift keyed phase at 0o, 90o, 180oand 270oand moments of manipulation and the order of these values of the phases are determined by the ratio of the signs of the elements of the binary SRP POP and GPP and transmitted phase difference.

With schema adding 9 signal enters the high-frequency transmitter and radiated in the air.

The received signal output from the high frequency receiver is fed to the multipliers 10 and 11, similar to the multipliers 5 and 6 of the transmitter. In the multiplier 10 a received signal is multiplied by a binary SRP, which produces FOPP similar POP transmitter. The output signal from the multiplier 10 is supplied to the bandpass filter 16, which allocates the oscillation of the carrier frequency signal. In the multiplier 11 and the received signal is multiplied by a binary SRP, which forms GAP similar GPP transmitter. The output signal from the multiplier 11 is supplied to paloalto phasing 14, similar to the device phasing 4 transmitter provides connection phase output sequences FOPP and GOP appropriate communication phase sequences FOPP and GPP transmitter. Binary SRP produced by the generators in the receiver is synchronized with the binary SRP received signal using the synchronization device 15. As a synchronization device 15 can be used the known device, ensure the synchronism of the local signal of the receiver with one of the strongest rays of the received multipath signal on the basis of the analysis of the function of cross correlation between the received and local signals.

As is known, when using broadband signals can be provided effective suppression of interfering rays or the addition of several selected the strongest rays, and the suppression of concentrated interference.

The oscillation of the carrier frequency from the outputs of bandpass filters 16 and 17 is supplied to a phase detector 18, which measures the information of the phase difference between them.

The disadvantage of this device prototype is a low immunity, since the information signal is transmitted on one polarization and the enemy easily moregames on the transmitting side of the generator carrier and clock frequencies (GNTC), one of the outputs connected to first inputs FOP and GPP, respectively, the second inputs of which are connected to the outputs of block phasing output FOPP connected to the first input of the first multiplier, a second input connected to the output of the phase shifter 90othe GPP output connected to the first input of the second multiplier, a second input connected to the output of the phase manipulator, the inputs of the phase shifter 90oand photomanipulators interconnected with the second output HNTC; at the receiving side device phasing and phase detector, characterized in that it introduced on the transmission side of the power splitter, the input connected to the output of the second multiplier, the third and fourth multipliers, the first inputs of which are connected respectively to the two outputs of the power splitter, and the second inputs of these multipliers connected respectively to the two outputs of opposite phase amplifier, whose input is connected to the output of the first multiplier, the outputs of the third and fourth multipliers connected respectively with the first and second horn of the transmitting antenna; at the receiving side of the first and second agents of the receiving antenna.

They are attached respectively to two of the ora, and the two inputs of subtractive device, the output of the adder through the amplitude limiter connected to the inputs of the synchronous detector and one of the inputs of the second correlator, the output of a synchronous detector connected to the first input of the first correlator and through a narrow-band low-pass filter with a control input of the rotation of polarization, the second inputs of the first and second correlators connected respectively to the outputs of the device phasing, the output of the first correlator connected to the first input of the mixer, the second input of which is connected to the output of the local oscillator and the mixer output is connected to the first input of the phase detector, the output of the second correlator through the phase shifter 90oconnected to the second input of the phase detector, the second output of the second correlator is connected to the third input of the first correlator.

In Fig. 2 shows a functional diagram of the proposed device, where we have introduced the notation:

1 is a generator of oscillations of the carrier and clock frequencies;

2 - shaper orthogonal SRP;

3 - generator SRP;

4 - unit phasing;

5, 6, the first and second multipliers;

7 - Phaser 90o;

8 - phase manipulator;

9 - splitter power;

10, 12 - the third and Thursday is;

14 - device phasing;

16 - transmitting antenna;

17 - reception antenna;

18 phase detector;

19, 20, the first and second agents of the receiving antenna.

21 - device rotation polarization;

22 - adder;

23 - subtractive device;

24 - narrowband low-pass filter;

25 - amplitude limiter;

26 - synchronous detector;

27, 28, the first and second correlators;

29 - mixer;

30 - heterodyne;

31 - Phaser 90o.

The proposed device has the following functional relation.

The transmitting device generator carrier and clock frequencies GNTC one output connected to the first inputs of the former (orthogonal SRP - POP and generator SRP - GP, the second inputs of which are connected to the outputs of block phasing 4, exit POP connected to one of the outputs of the first multiplier 5, the second input of which is connected to the output of the phase shifter 7 90o, an input connected to one of inputs of the phase manipulator 8 and one of the outputs GNTC, the output of the phase manipulator 8 is connected to one of inputs of the second multiplier 6, the second input is connected to the output GPP, and the output of the second multiplier is connected to whlu 13, and the second output of the power splitter through the fourth multiplier 12 is attached to the second irradiator 15 of the transmitting antenna 16, the second inputs of the third 10 and fourth 12 multipliers connected respectively with the first and second outputs of opposite phase amplifier 11, an input connected to the output of the first multiplier 5.

At the receiving side of the first 19 and second 20 agents of the receiving antenna 17 are connected respectively to two inputs of the device to rotate the polarization of 21, two output of which is connected respectively to the two inputs of the adder 22 and two inputs subtractive device 23, the output of the adder 22 through the amplitude limiter 25 is connected to the input of the second correlator 28 and one of the inputs of the synchronous detector 26, a second input connected to the output of subtractive device 23, the output of the synchronous detector 26 is connected to the input of the first correlator 27 and through a narrow-band low-pass filter 24 is connected with the control input of the rotation of the polarization 21, the second inputs of the first 27 and second 28 correlators are connected respectively with the first and second outputs of the device phasing 14, the output of the first correlator 27 through the mixer 29 is connected to one of inputs of the phase detector 18, and you the Torah input to the mixer 29 is connected to the output of the local oscillator 30. The second output of the second correlator 28 is connected to the third input of the first correlator 27.

The proposed device operates as follows.

In the transmitter GNTC generates two frequencies: a clock - for FOP and GPP that produce binary SRP. These SRP represent sets of bipolar pulses of direct current of the same magnitude and duration, which is determined by the clock frequency.

The laws of formation of the SRP shall be such to ensure low cross-correlation between the pseudo-random sequences FOPP and GPP at any phase shift between them (quasiorthogonal binary SRP). This condition is necessary for their effective separation and suppression of the echo signals in the receiver. The device phasing 4 sets shift registers POP and GPP in the same initial state, so that the communication phase of their pseudorandom sequences. The device phasing 4 consists of decoders initial States FOPP and GPP and pulse phasing scheme, which provides a combination of initial conditions in phase.

Binary SRP output FOPP is supplied to the multiplier 5. To the second input of the multiplier Nogueda binary SRP. As a result, the output of the multiplier 5 is formed a signal representing the oscillation of the carrier frequency with a constant amplitude shift keyed phase by 180oby law, the binary SRP.

Binary information output GPP is supplied to the multiplier 6, the second input is through the phase manipulator 8 output GNTC comes oscillation of the carrier frequency. At the output of the multiplier 6 is formed a signal representing the oscillation of the carrier frequency with a constant amplitude shift keyed phase by 180oby law, the binary SRP. Depending on the sign of the transmitted information of the phase manipulator 8 carry out the rotation phase of the carrier frequency at the output of the multiplier 6 relative to the carrier frequency of the signal at the output of the multiplier 5 to 0 or 180o. Thus, depending on the sign of information transmitted carrier frequencies of these signals are shifted from each other in phase.

From the output of the multiplier 6, the signal is fed to a power splitter 9, where the separation of its power in half and each half is issued respectively on the two outputs to the inputs of the third 10 and fourth 12 multipliers.

From the output of the first multiplier 5, the signal at the opposite phase of usilitel 10 and 12 fourth multipliers.

With an output of the third multiplier 10, the signal at the first irradiator 13, and the output of the fourth multiplier 12 is in the second irradiator 15 of the transmitting antenna 16. The transmitting antenna can be implemented in the form of a reflector antenna with two irradiators or in the form of array antennas with appropriate agents. Irradiators 13, 15 create fields with orthogonal one with respect to another line or circular polarization.

The signals emitted by the transmitting antenna 16, are receiving antenna 17. It irradiators (pathogens) 19, 20 are also orthogonal linear or circular polarization. Receiving antenna 17 and its agents 19, 20 are identical transmitting.

The received signal through the device to rotate the polarization of 21 is supplied to two inputs of the adder 22 and two subtractive input device 23. From the output of the adder 22, the signal is sent to an amplitude limiter 25, where is the alignment of the amplitudes, and the second correlator 28 and synchronous detector 26 as a reference signal. At the signal input of the synchronous detector 26 receives the signal from the output of subtractive device 23. The signal from the synchronous detector has a constant component, the sign of which CLASS="ptx2">

In this case, this component is equal to

U= -KV0sin,

where K is the transmission coefficient of the synchronous detector;

V0- effective amplitude limited signal.

This DC component is extracted using a low-frequency narrow-band filter 24 and is supplied to the device 21 controls the position of the axes of polarization of pathogens 19, 20, which will turn these pathogens so that the angle becomes equal to zero.

From the output of the amplitude limiter 25 signal at the second correlator and the output of the synchronous detector 26 on the first correlator 27.

An embodiment of the first 27 and second 28 correlators shown in Fig. 3, where indicated:

271 generator SRP (gpsa);

272 - low pass filter (LPF);

273 - multiplier;

274 - integrator;

281 - multiplier;

282 - integrator;

283 - the decisive scheme;

284 - GPSA;

285 - shaper threshold;

286 - unit synchronization.

The signal from the amplitude limiter 25 is supplied to the multiplier 281, to the second input of which receives the reference signal from gpsa 284 and the multiplier on the integrator 282 and decisive circuit 283 and the shaper threshold 285 and output decisive schema 283 C the synchronization unit 286 is rebuilding phase as long while the correlator will not detect the signal and the synchronization unit will give the command to stop gpsa 284. Block phasing 14 sets the initial phase generators 284 and 271.

The output signal from the synchronous detector 26 through a low-pass filter 272, the bandwidth is determined by the bandwidth of the SRP on videocasette, is supplied to the multiplier 273, to the second input of which is applied the reference signal with gpsa 271 and further integrator 274. The signal from the integrator on videocassette is supplied to the inverter 29 (Fig. 2), consisting of a local oscillator 30, mixer 291 (Fig. 3) and band pass filter 292. In this mixer the signal is transferred to the radio frequency and is fed to one input of phase detector 18.

The output of the second correlator 28 through the phase shifter 90osupplied to the second input of phase detector 18, the output of which is removed, the information transmitted.

Thus, when transmitting information, the two beams are orthogonal to one another linear or circular polarizations, thereby greatly improving the immunity of the transmitted information, as well as stealth.

The wireless link connection with the spatial separation of the signal containing the transmission satele orthogonal SRP (FOPP) and generator SRP (GPP), respectively, the second inputs of which are connected to the outputs of block phasing output FOPP connected to the first input of the first multiplier, a second input connected to the output of the phase shifter 90othe GPP output connected to the first input of the second multiplier, a second input connected to the output of the phase manipulator, the inputs of the phase shifter 90oand phase arm are connected to the second output GNTC, at the receiving side device phasing and phase detector, wherein imposed on the transmission side of the power splitter, the input connected to the output of the second multiplier, the third and fourth multipliers, the first inputs of which are connected respectively to the two outputs of the power splitter, and the second inputs of these multipliers connected respectively to the two outputs of opposite phase amplifier, whose input is connected to the output of the first multiplier, the outputs of the third and fourth multipliers connected respectively with the first and second horn of the transmitting antenna, at the receiving side of the first and second agents of the receiving antenna attached respectively to the two inputs of the device rotation of polarization, two outputs which are connected respectively with the two in which dine with the inputs of the synchronous detector and one of the inputs of the second correlator, the output of a synchronous detector connected to the first input of the first correlator and through a narrow-band low - pass filter with a control input of the rotation of polarization, the second inputs of the first and second correlators connected respectively to the outputs of the device phasing, the output of the first correlator connected to the first input of the mixer, the second input of which is connected to the output of the local oscillator and the mixer output is connected to the first input of the phase detector, the output of the second correlator through the phase shifter 90oconnected to the second input of the phase detector, the second output of the second correlator is connected to the third input of the first correlator.

 

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