Phase mode of direction finding and phase direction finder for its execution

FIELD: the proposed mode and arrangement refer to the field of radio electronics and may be used for definition of position of sources of emitting complex signals.

SUBSTANCE: the phase direction finder realizing the proposed phase mode of direction finding, has receiving aerials, receivers and a supporting generator, an impulse generator, an electronic commutator, a phase changer on 90, a phase detector and an indicator, a heterodyne, a mixer, an amplifier of an intermediate frequency, multipliers and band filters and a line of delay.

EFFECT: elimination of antagonism between requirements to accuracy of measuring and unique angle reading at phase mode of direction finding of sources of emitting of complex signals.

2 cl, 2 dwg

 

The proposed method and device relate to the field of radio electronics and can be used to determine the location of radiation sources of complex signals.

Known phase methods measurements and the phase direction finders (patents of the Russian Federationâ„–â„–2003131, 2006872, 2010258, 2012010, 2134429, 2155352, 2175770; Kinkelin IE and other Phase method for the determination of coordinates. M: Owls. Radio, 1979; Space radio systems. Edited Shibukawa. M: Owls. radio, 1967, p.134-138, RIS and others).

Known technical solutions closest to the proposed phase are way direction-finding phase signal for its implementation (Space radio systems. Edited Shibukawa. M: Owls. radio, 1967, p.134-138, RIS), which is selected as prototypes.

During phase method of direction finding phase difference Δϕ the signals received by two spaced antennas, is given by the expression

Δϕ=2π·d/λ·Sinα,

where d is the distance between the spaced antenna (measurement basis);

λ wavelength;

α - the angle of arrival of radio waves relative to the normal to the database.

However, the known phase direction finding method and the phase direction finder for its implementation inherent contradiction between the requirements of accuracy and unambiguity of the reference angle α. There is indeed, according to the above formula, the phase method and the phase signal, the more sensitive to changes in angle α, the larger the relative size of the database d/λ. But with increasing d/λ decreases the value of the angular coordinate αin which the phase difference Δϕ exceeds the value of 2πi.e. comes the ambiguity of reference.

An object of the invention is the elimination of contradictions between the requirements of accuracy and unambiguity of the reference angle when the phase method of direction finding sources of complex signals.

The problem is solved in that phase according to the method of direction finding based on the reception signals on the two antennas, remote from each other at a distance d, enhancing and restricting them by amplitude comparison of signals passed two channels in phase, the signal of one channel pre-shift phase by 90°set in the azimuthal plane n receiving antennas on a circle of radius d with electronic rotation with angular velocity Ω around the receiving antenna, placed in the center of the circle, commute receiving antennas placed around the circumference of the alternately with the frequency Ω, the signal received fixed antenna, convert the frequency, produce a voltage intermediate frequency, Peremohy it with the signals on cereno accept n receiving antennas, spaced around the circumference, allocate fazokodirovannymi voltage, Peremohy its voltage lo emit low-frequency voltage with a frequency of Ω and comparing its phase with the reference voltage forming accurate but ambiguous scale measurements of the radiation source signal, simultaneously fazokodirovannymi voltage is subjected to autocorrelation processing, emit low-frequency voltage with a frequency of Ωcompare its phase with the reference voltage, forming a crude but simple scale measurements of the radiation source signal.

The problem is solved in that the phase signal containing series-connected first receiving antenna and the first receiver, second receiver, the second receiving antenna, consistently enabled Phaser 90°the first phase detector and an indicator provided with a reference oscillator, a pulse generator, an electronic switch, n receiving antennas placed on a circle of radius d with electronic rotation around the receiving antenna, placed in the center of the circle, a local oscillator, a mixer, an intermediate frequency amplifier, two multiplier products, two bandpass filters, delay line, the second and third phase detectors, and the first output of the reference oscillator in series is clucene the pulse generator, the electronic switch has n inputs connected to the outputs of the n antennas placed on the circumference, a second receiver, the first multiplier, the first band-pass filter, a delay line and a second phase detector, a second input connected to the output of the first bandpass filter, and the output connected to the phase shifter 90°and the second input of the first phase detector connected to the second output of the reference oscillator, the output of the first receiver connected in series mixer, a second input connected to the output of the local oscillator, and intermediate frequency amplifier, the output of which is connected to a second input of the first multiplier, the output the first bandpass filter connected in series, a second multiplier, a second input connected to the output of the local oscillator, the second band-pass filter and a third phase detector, a second input connected to the third output of the reference oscillator, and the output connected to the second input of the indicator.

The structural phase diagram is developed that implements the proposed phase method of direction finding, presented in figure 1. The mutual arrangement of the receiving antennas 1, 2.i (i=1, 2, ..., n) and the radiation source signal N shown in figure 2.

The phase signal contains consistently included the first receiving antenna 1, the first receiver 3, a mixer 12, a second input connected to o the house of the local oscillator 11, the amplifier 13 intermediate frequency, the first multiplier 14, the first band-pass filter 15, a delay line 16, the second phase detector 17, the phase shifter 8 90°the first phase detector 9, a second input connected to a second output of the reference oscillator 5, and the indicator 10. To the first output of the reference oscillator 5 are connected in series generator 6 pulses, the electronic switch 7, n inputs connected to the outputs of the n receiving antennas 2.i (i=1, 2, ..., n), is placed on the circle of radius d, and the second receiver 4, the output of which is connected to the second input of the first multiplier 14. The output of the first bandpass filter 15 connected in series to the second multiplier 18, a second input connected to the output of the local oscillator 11, the second band-pass filter 19 and the third phase detector 20, a second input connected to the third output of the reference oscillator, and the output connected to the second input of the indicator 10.

The proposed method is implemented as follows.

The received complex signals, for example, phase shift keying (QPSK):

U1(t)=υc·Cos[(ωwith±Δω)t+ϕk(t)+ϕwith],

U2(t)=υc·Cos[(ωc±Δω)t+ϕk(t)+ϕc+2π·d/λ·Cos( Ωt-α)], 0≤t≤Tc,

where υcthat ωwiththat ϕcc- amplitude, carrier frequency, initial phase, and signal duration;

±Δω - instability of the carrier frequency signal, due to various destabilizing factors;

ϕk(t)={0,π} - manipulated component phases, reflecting the law of phase manipulation in accordance with the modulating code, and ϕk(t)=const k·τe<t<(k+1)·τeand may change abruptly at t=k·τei.e. at the boundaries between elementary parcels (k=1, 2, ..., N-1);

τeN - the length and number of basic assumptions which form the signal duration Tc(Twith=N·τe);

d is the radius of the circle, where the receiving antenna 2.i (i=1, 2, ..., n), (test database);

Ω - electronic speed of rotation of the receiving antennas 2.i (i=1, 2, ..., n) around the receiving antenna 1;

α - bearing (azimuth) on the radiation source signal;

with the outputs of the receiving antennas 1, 2.i (i=1, 2, ..., n) directly and through the electronic switch 7 receives the inputs of the receivers 3 and 4, and then to the first inputs of the mixer 12 and the multiplier 14, respectively. To the second input of the mixer 12 from the output of the local oscillator 11 is supplied voltage

Ug(t)=υg·Cos (ωgt+ϕg),

where υgthat ωgthat ϕg-amplitude, the frequency and initial phase of the voltage of the local oscillator.

At the output of the mixer 12 are formed voltage Raman frequencies. The amplifier 13 is allocated to the intermediate voltage (differential) frequency

UCR(t)=υCR·Cos[(ωCR±Δω)t+ϕk(t)+ϕCR], 0≤t≤Twith,

where υCR=1/2K1·υwith·υg;

K1the gain of the mixer;

ωCRwithg- intermediate (differential) frequency;

ϕCRwithg,

which is applied to a second input of the multiplier 14. The output of multiplier 14 is formed fazokodirovannymi (FM) oscillation frequency ωglo 11

U3(t)=υ3·Cos[ωgt+ϕg+2π·d/λ·Cos( Ωt-α)], 0≤t≤Twith,

where υ3=1/2K2·υc·υCR;

K2- transfer coefficient multiplier,

given bandpass filter 15 and is supplied to the first inputs of the phase detector 17, the delay line 16 and the multiplier 18. To the second input of the last voltage Ug(t) lo 11. The output of multiplier 18 is formed harmonic voltage

U4(t)=υ4·Cos[2π·d/λ·Cos( Ωt-α)], 0≤t≤ Twith,

where υ4=1/2K2·υ3·υg,

given bandpass filter 19 and is supplied to the first input of phase detector 20. To the second input of phase detector 20 from the third output of the reference oscillator 5 is supplied reference voltage

U0(t)=υ0·Cos Ωt

The output of phase detector 20 produces a DC voltage

UH1(α)=υH1·Cosα,

where υH1=1/2K3·υ4·υ0;

To3- gain of the phase detector,

which is recorded by the indicator 10. Thus is formed the scale, direction finding, which is accurate but ambiguous scale.

Simultaneous fazokodirovannymi oscillation U3(t) is the autocorrelation processing using autocorrelator consisting of a delay line 16 and the phase detector 17.

In photomodulation voltage U3(t) the value of mϕ=2π·d/λcalled the index of phase modulation, characterized by the maximum value of deviation of the phase from the zero value occurring when the electronic rotation of the receiving antennas 2.i (i=1, 2, ..., n) around the receiving antenna 1 (figure 2).

The receiving antenna 2.i (i=1, 2, ..., n) alternately with the frequency Ω switched by using an electronic switch 7 controlled n-phase is eneration 6 pulses. Control pulses are generated by the generator 6 pulses of harmonic voltage generated by the reference generator 5

U0(t)=υ0·Cos Ωt

However, when d/λ>1/2 comes the ambiguity of the reference angle α. Elimination of the mentioned ambiguity by reducing the relationship d/λ usually not justified, because in this case you lose the main advantage of shirokorelsovogo of the direction finder. In addition, in the range of VHF and especially UHF waves to take small values of d/λ often fails due to design considerations.

In view of the above stated reasons, the challenge is to reduce the index of phase modulation without reducing the relative size of the measuring base d/λ. This is achieved by the autocorrelation processing photomodeling voltage U3(t) with delay line 16 and the phase detector 17. Moreover, the delay time τ line 16, the delay is chosen such as to reduce the index of phase modulation to the value

mϕ1=2π·d1/λ,

where d1<d,

when true the inequality

d1/λ<1/2,

providing an unambiguous finding the source of the radiation signal. The output of the phase detector 17 is formed harmonic voltage

U5(t)=υ5·Cos( Ωt-α), 0≤t≤Tc ,

where υ5=1/2K3·υ32,

which, through the phase shifter 8 90° arrives at the first input of phase detector 9, the second input is from the third output of the reference oscillator 5 is supplied reference voltage U0(t). The output of phase detector 9 produces a constant voltage

UH2(α)=υH2·Sinα,

where υH2=1/2K3·υ5·υ0,

which is recorded by the indicator 10.

Thus is formed the scale, direction finding, which is rough, but a definite scale.

Thus, the proposed method and the device in comparison with prototypes provide more accurate measurements of the radiation source of complex signals. This is achieved by increasing the measuring base d. And the resulting ambiguity of reference angular coordinates α eliminated by the use of n receiving antennas 2.i (i=1, 2, ..., n), which are installed in the azimuthal plane on a circle with radius d (measurement basis) with electronic rotation with angular velocity Ω around the receiving antenna 1, placed in the center of the circle, and the autocorrelation processing of the received complex signals.

Moreover, the proposed technical solutions invariants to instability of the carrier frequency of the received signals XVI is their modulation (manipulation) and the width of the spectrum, and full and unambiguous measurement of the angular coordinates α operates at the frequency Ω reference generator.

Due to the convolution of the spectrum of FMN complex signal, it is converted to narrowband fazokodirovannymi (FM) voltage that allows to select it using a bandpass filter while filtering out much of the noise and interference, i.e. to increase the real sensitivity of the frequency-phase signal with a relatively low signal-to-noise.

1. The phase method of direction finding based on the reception signals, amplification and limiting them by amplitude comparison of signals passed two channels in phase, the signal of one channel pre-shift phase by 90°, characterized in that the set in the azimuthal plane n receiving antennas on a circle of radius d with electronic rotation with angular velocity Q around the receiving antenna, placed in the center of the circle, commute receiving antennas placed on a circle, alternately with frequency Q, the signal received by the antenna, placed in the centre of a circle, convert frequency, produce a voltage intermediate frequency, Peremohy it signals alternately accept n receiving antennas located around the circumference, allocate fazokodirovannymi voltage, Peremohy it with nab what agenies lo emit low-frequency voltage with a frequency of Q and compare its phase with the reference voltage forming accurate but ambiguous scale measurements of the radiation source signal, simultaneously fazokodirovannymi voltage is subjected to autocorrelation processing, emit low-frequency voltage with a frequency Q, compare its phase with the reference voltage, forming a crude but simple scale measurements of the radiation source signal.

2. The phase signal containing series-connected first receiving antenna and the first receiver, second receiver, consistently enabled Phaser 90°the first phase detector and indicator, characterized in that it is provided with a reference oscillator, a pulse generator, an electronic switch, n receiving antennas placed on a circle of radius d with the possibility of rotation around the first receiving antenna placed in the center of the circle, a local oscillator, a mixer, an intermediate frequency amplifier, two multiplier products, two bandpass filters, delay line, the second and third phase detectors, and to the first output of the reference oscillator sequentially connected to the pulse generator, electronic switch has n inputs connected to n outputs of the antennas placed around the circumference, a second receiver, the first perennial is, the first band-pass filter, a delay line and a second phase detector, a second input connected to the output of the first bandpass filter, and the output connected to the phase shifter 90°the second input of the first phase detector connected to the second output of the reference oscillator, the output of the first receiver connected in series mixer, a second input connected to the output of the local oscillator, and intermediate frequency amplifier, the output of which is connected with the second input of the first multiplier, the output of the first bandpass filter connected in series, a second multiplier, a second input connected to the output of the local oscillator, the second band-pass filter and the third phase detector second input connected to the third output of the reference oscillator, and the output connected to the second input of the indicator.



 

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The phase signal, // 2189609

The invention relates to radio navigation, radio navigation and can be used to determine the location and movement of radiation sources of complex signals

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