The phase signal,

 

The proposed relates to a direction finder, radar, radio navigation and can be used for determining the angular coordinates of the radiation source photomanipulating (QPSK) signal. The phase finder contains the first 1 and second 2 receiving antennas, the first 3 and second 4 receivers, the first 5 second 6 and third 14 multiplier products, the first 7 and second 8 narrowband filters, the first 9 and second 21 phasers on the 90othe phase detector 10, the first 11 and second 16 indicators, the correlator 12, block 13 adjustable delay, the filter 15 of the lower frequencies, extreme regulator 17, the measuring device 18, the first 19, the second 20, the third 22 and fourth 23 Quad, the scaling multiplier 24, myCitadel 25 and an adder 26. Achievable technical result of the invention is to increase the sensitivity of the signal in the measurement of small phase shifts that determine the direction of the radiation source QPSK signal. 3 Il.

The proposed relates to a direction finder, radar, radio navigation and can be used for determining the angular coordinates of the radiation source photomanipulating (QPSK) signal.

Known devices for measurements of radiation sources of signals (and trajectory measurements. Edited by P. A. Agadzhanova and others - M.: Owls. radio, 1969, S. 244-245; Kinkelin I. E. and other Phase method for the determination of coordinates. - M.: Owls. radio, 1979 and others).

As a basic device selected Phase signal (RF patent 2165628, G 01 S 3/00, 2000).

This signal provides the resolution of contradictions between the requirements of accuracy and unambiguity of the reference angular coordinates. This is achieved by using two measurement scales: a phase scale - accurate but ambiguous, and the timeline is a rough but clear. Thus due to the convolution of the spectrum of the received QPSK signal increases the sensitivity, noise immunity and accuracy of measuring the phase difference between the signals passed two channel phase signal. And phase jumps in the received QPSK signals do not affect the results of the measurements.

An object of the invention is to increase the sensitivity of the signal in the measurement of small phase shiftsdetermining the direction to the radiation source QPSK signal.

The problem is solved in that the phase signal containing series-connected first receiving antenna, a first receiver, iltr and the first phase shifter 90osequentially included a second receiving antenna, a second receiver, the second multiplier, the second input is also connected to the output of the second receiver, the second notch filter, phase detector, a second input connected to the output of the first phase shifter 90oand the first indicator connected in series to the output of the second receiver block adjustable delay, the third multiplier, the input connected to the output of the first receiver, the lowpass filter and the measuring device, the output of lowpass filter through extreme regulator connected to the second input of the adjustable delay unit, to the second output of which is connected to the second indicator, the four Quad, the second phase shifter 90o, the scaling multiplier, myCitadel and the adder, and the output of phase detector connected in series to the first squarer, a second squarer and the adder, the output of which is connected to a second input of the first indicator, the output of phase detector connected in series to the second phase shifter 90o, the third squarer, the scaling multiplier, a second input connected to the output of the first Quad, and myCitadel, the second input of coloratura.

A structural scheme of the phase direction finder shown in Fig.1. The direction-finding feature is shown in Fig.2. The mutual arrangement of the receiving antennas and the radiation source QPSK signal is shown in Fig. 3.

The phase signal contains consistently included the first receiving antenna 1, the first receiver 3, the first multiplier 5, the second input is also connected to the output of the first receiver 3, the first narrow-band filter 7, the first phase shifter 9 90oconsistently included the second receiving antenna 2, the second receiver 4, the second multiplier 6, the second input is also connected to the output of the second receiver 4, the second narrow-band filter 8, a phase detector 10, a second input connected to the output of the first phase shifter 9 90oand the first indicator 11, sequentially connected to the output of the second receiver 4 unit 13 adjustable delay, the third multiplier 14 (a second input connected to the output of the first receiver 3), the filter 15 of the lower frequencies and the measuring device 18, the output of the filter 15 of the lower frequencies through extreme regulator 17 is connected to the second input unit 13 adjustable delay (to the second output of which is connected to the second indicator 16), is(the output of which is connected to a second input of the first indicator 11), sequentially connected to the output of the phase detector 10, a second phase shifter 21 90o, the third squarer 22, the scaling multiplier 24 (a second input connected to the output of the first Quad 19), and myCitadel 25, the second input is through fourth squarer 23 is connected to the output of the third Quad 22, and the output connected to the second input of adder 26.

The phase signal is as follows.

Accept QPSK signals: U1(t) = V1(t)cos[Wct+to(t)+1];where V1(t),V2(t-),Wc,1,2Tc - envelopes, carrier frequency, initial phase, and the duration of the signalsthe time lag of the signal arriving at antenna 2 relative to the signal arriving at the antenna 1; d is the distance between the receiving antennas 1 and 2, located on the same line (measurement basis);- the angle of arrival of radio waves; c is the speed of light;to(t) = {0,} - manipulated from ICEMK(t)=const for Ke<t<(K+1)eand may change abruptly at t = Ke, i.e., at the boundaries between elementary parcels (K=1, 2,...N-1).

eN - the length and number of basic assumptions which form the signal of duration TC (TC=Ne); the outputs of the receiving antennas 1 and 2 are received at the inputs of the receivers 3 and 4, respectively, where they are amplified and limited in amplitude:
U3(t) = V0cos[Wct+to(t)+1],

where V0the threshold limit.

These signals in the multiplier products 5 and 6 are multiplied themselves. As a result, the outputs of the multiplier products 5 and 6 are formed following stress results:
U5(t) = V1cos[2Wct+21],
U6(t) = V1cos[2Wc(t-)+22], 0tTc,
residents, which represent the second harmonic of the channel stress.

It should be noted that the width of the spectrumFC received QPSK signal is determined by the durationetheir basic packages
fc = 1/e,
whereas the width of the spectrum of the second harmonic is determined by the duration TC signals:
f2= 1/Tc.

Therefore, when the multiplication of QPSK signals themselves on their range of rolled N times
fc/f2= N
This circumstance allows to select harmonic oscillations U5(t) and U6(t) using narrowband filters 7 and 8 while filtering out much of the noise and interference.

If harmonic oscillations U5(t) and U6(t) with the output of narrow-band filters 7 and 8 apply directly to the phase discriminator 10, then the output of the last will get

where V2= 1/2K2V12;=2-1;
To2- coefficient Ode discriminator depends on the anglehowever , due to the fact that the cosine function is even, the sign of U 'o() does not depend on the sign of the angle, i.e. does not depend on the side of the deviation. To eliminate this drawback in the first channel includes a phase shifter 9, which changes the phase of the harmonic signal U5(t) on the 90o. In this case, the voltage error at the output of the phase discriminator 10 is determined by the expression
Uo() = V2sin(2d/sin) = V2sin.
Dependence is usually called the direction-finding characteristic (Fig.2).

The slope in the region of small angleswhere the characteristic is almost linear, equal

Thus, the slope is determined by the ratio d/. Increase the base d and decreasing wavelengthincrease the slope of the Khowever , this increases the ambiguity of acoustically 2minat a given value of the noise VW(Fig.2).

The number of zones of ambiguity, i.e., regions where the phase differenceadjusted by an amount equal to 2that is determined by the ratio
n = 2d/.
For a single reference, you need to choose n=1, i.e., to choose the measuring base d on the basis of conditions
d</2.
Thus is formed a phase scale reference angular coordinatesprecise but ambiguous. The measurement results are recorded by the indicator 11.

To increase the sensitivity of the direction finder when measuring small values of the phase shiftuse the principle of "gain", which is based on the technical implementation of the algorithm
cos4-6cos2sin2+sin4= cos4.
Voltage Uo() = U2sin2.
This voltage is fed to the input of the second Quad 20, the output of which is formed a voltage
U8(t) = V42sin4.
Simultaneously, the voltage Uo() from the output of the phase detector 10 is fed to the input of the phase shifter 21 90o, the output of which produces a voltage
U9(t) = V2sin(+90) = U2cos,
which is input to the third Quad 22. The output of the last generated voltage
U10(t) = V22cos2.
This voltage is fed to the input of the fourth Quad 23, the output of which is formed a voltage
U11(t) = V42cos4U12(t) = 6U7(t)U10(t) = 6V42sin2cos2.
Voltage U11(t)and U12(t) are fed to the two inputs of vicites 25, the output of which is formed a voltage

Voltage U8(t)and U13(t) are fed to the two inputs of the adder 26, the output of which is formed a voltage

This voltage is fixed to a second input of the first indicator 11.

Voltage U3(t) and U4(t) from the outputs of the receivers 3 and 4 simultaneously fed to two inputs of the correlator 12, consisting of a block 13 of the adjustable delay of the multiplier 14 and the filter 15 of the lower frequencies. Obtained at the output of the correlator 12 correlation function R(), measured by the measuring device 18 has a maximum at the value entered adjustable delay
0= t2-t1,
where t1, t2- time of signal distances R0) the correlation function is supported using extreme regulator 17 acting on the second input unit 13 adjustable delay. Scale unit 13 adjustable delay (index corner) is calibrated directly in values of the angular coordinates of the radiation source FMN-signal

where0is introduced into the second channel signal delay corresponding to the maximum of the correlation function R(0).
The value of the angular coordinatefixed the second indicator 16.

Thus is formed the timeline reference angular coordinatesrough, but clear.

Essentially measuring scales measured the full phase difference
F1= m+,
where m is the number of complete cycles of the measured phase difference, defined timeline;
the phase difference measured by the phase scale (02).
Thus, the to radiation QPSK signal, 4 times more than the original phase shift. Thus in the proposed phase signal, compared with the prototype and other known devices provides increased sensitivity in the measurement of small phase shifts corresponding to the direction of the radiation source QPSK signals.


Claims

The phase signal containing series-connected first receiving antenna, a first receiver, the first multiplier, the second input is also connected to the output of the first receiver, the first narrowband filter and the first phase shifter 90osequentially included a second receiving antenna, a second receiver, the second multiplier, the second input is also connected to the output of the second receiver, the second notch filter, phase detector, a second input connected to the output of the first phase shifter 90oand the first indicator connected in series to the output of the second receiver block adjustable delay, the third multiplier, a second input connected to the output of the first receiver, the lowpass filter and the measuring device, the output of lowpass filter through extreme regulator connected to the second is that it introduced four Quad, the second phase shifter 90o, the scaling multiplier, myCitadel and the adder, and the output of phase detector connected in series to the first squarer, a second squarer and the adder, the output of which is connected to a second input of the first indicator, the output of phase detector connected in series to the second phase shifter 90o, the third squarer, the scaling multiplier, a second input connected to the output of the first Quad, and myCitadel, the second input is through fourth squarer coupled to the output of the third Quad, and the output connected to the second input of the adder.

 

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FIELD: radiolocation.

SUBSTANCE: device has divider and calibrating voltage source, and also has multiplier and converter of guiding cosine signal of radio signal direction relatively to plane of phased antennae grid opening Ux = cos(90-α0) to signal of guiding cosine of radio signal direction relatively to normal line to plane of phased antennae grid opening Uz = cosα0, serving for automatic correction of calibrating voltage on basis of law Uz=cosα0.

EFFECT: higher precision.

2 dwg

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