The phase signal,

 

(57) Abstract:

The proposed direction finder relates to the field of radar, radio navigation and can be used for determining the angular coordinates of the radiation source photomanipulating (QPSK) signal. Achievable technical result of the invention is to expand the functionality of the radio signal by the location of the radiation source photomanipulating signal in space and the estimation of its parameters. The phase signal contains the first 1, second 2 and third receiving antenna 22, the first 3, the second 4 and the third 23 receivers, first 5, second 6, third 14, 24 fourth and fifth 30 multiplier products, first 7, second 8 and third 25 narrowband filters, the phase shifter 9 90othe first 10 and second 26 of the phase detectors, the first 11, second 16, 27 third and fourth 32 indicators, the first 12 and second 28 correlators, the first 13 and second 29 blocks adjustable delay, the first 15 and second 31 filters low pass, first 18 and second 34 measuring devices, the first 17 and second 33 extreme regulators. 5 Il.

The proposed direction finder relates to the fields of radar, radio navigation and can be used for determining the angular coordinates of the source islane signals (ed. mon. The USSR 164.326, 558.584, 1.555.695, 1.591.664, 1.591.665, 1.602.203, 1.679.872, 1.730.924, 1.746.807, 1.832.947; patents of the Russian Federation 2.006.872, 2.003.131, 2.012.010, 2.010.258, 2.165.628. Space trajectory measurement. 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).

The basic unit is the "Phase signal" (patent of the Russian Federation 2.165.628, G 01 S 3/00, 2000), and selected as a prototype.

The specified direction finder provides the resolution of contradictions between the requirements of accuracy and unambiguity of the reference angular coordinates of the radiation source QPSK signal by applying two measurement scales: a phase measurement scale is accurate but ambiguous, and timeline measurement is rough, but clear.

However, the direction finder allows you to pelargonate radiation source QPSK signal only in this plane, and it provides the possibility to determine the parameters processed QPSK signal.

An object of the invention is to expand the functionality of the radio signal by the location of the radiation source photomanipulating signal in space and the estimation of its parameters.

Postavljena the volume of the measuring channel consists of cascaded first receiving antenna, the first receiver, the first multiplier, the second input is also connected to the output of the first receiver, the first notch filter and phase shifter 90ofirst of DF channel consists of cascaded second receiving antenna, a second receiver, the second multiplier, the second input is also connected to the output of the second receiver, the second narrowband filter, the first phase detector, a second input connected to the first output of the phase shifter 90oand the first indicator of sequentially connected to the output of the second receiver of the first adjustable delay unit, the second input is through the first extreme regulator connected to the output of the first lowpass filter, a third multiplier, a second input connected to the output of the first receiver, the first lowpass filter and the first measuring device, to the second output of the first adjustable delay unit connected to the second indicator, supplied with the frequency detector, the trigger, the registration unit and the second direction-finding channel, consisting of series-connected third receiving antenna, the third receiver, the fourth multiplier, a second input to, the Torah an input connected to the second output of the phase shifter 90oand the third indicator of sequentially connected to the output of the third receiver of the second adjustable delay unit, the second input is a second extreme regulator connected to the output of the second lowpass filter, the fifth multiplier, a second input connected to the output of the first receiver, the second low pass filter and the second measuring device and to the second output of the adjustable delay unit is connected to the fourth indicator, the output of the first receiver serially connected frequency detector, trigger and registration unit, the receiving antenna is placed in the geometric form of a right angle, the apex of which is located the first receiving antenna of the measuring channel, total for the direction-finding receiver antennas channels.

A structural scheme of the phase direction finder shown in Fig. 1. The mutual arrangement of the receiving antennas is shown in Fig.2. DF characteristics shown in Fig.3 and 4. Timing chart explaining the operation of the measuring channel, depicted in Fig.5.

The phase signal contains one measurement and two delegationto 3, the first multiplier 5, the second input is also connected to the output of the receiver 3, the first notch filter 7 and the phase shifter 9 90o. The output of the first receiver 3 are connected in series to the frequency detector 19, the trigger 20 and the block 21 of the Desk. Each DF channel consists of cascaded second 2 third 22) of the receiving antenna, the second (third) of the receiver 4(23), the multiplier 6(24), the second input is also connected to the output of the receiver 4(23), notch filter 8(25), phase detector 10(26), a second input connected to the first (second) output of the phase shifter 9 90oand indicator 11(27). To the output of the receiver 4(23) connected in series block 13(29) adjustable delay, the second input is through extreme regulator 17(33) is connected to the output of the filter 15(31) the lower frequency multiplier 14(30), a second input connected to the output of the receiver 3, the filter 15(31) of the lower frequencies and the measuring device 18(34). To the second output unit 13(29) adjustable delay of the connected indicator 16(32). Cascaded unit 13(29) adjustable delay, the multiplier 14(30) and the filter 15(31) of the lower frequencies form the correlator 12(28).

The phase signal is as follows.

1)cos[Wc(t1)+K(t1)+2],

< / BR>
where V1(t), V2(t1), V3(t2), Wc,1,2Tc - envelopes, carrier frequency, initial phase, and the duration of the signals;

the time lag of the signal arriving at antenna 2 relative to the signal arriving at antenna 1 (Fig.2);

the time lag of the signal arriving at the antenna 22 with respect to the signal arriving at the antenna 1;

d1...d2measuring base;

- the angles of arrival of radio waves in the azimuthal and elevation planes;

C is the speed of propagation of light;

K(t) = {0, } - manipulated component phases, reflecting the law of phase manipulation in accordance with the modulating function (ID) M(t) (Fig. 5, a), and K(t) = const for Ke<t<(K+1)e, 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);

with the outputs of the receiving antennas 1, 2 and 22 are received at the inputs of the receivers 3, 4 and 23, where they are amplified and limited in amplitude:

U4(t) = Vocos[Wct+K(t)+a1],

U5(t) = Vocos[Wc(t1)+K(t1)+2],

< / BR>
where = V<'SV a result, the outputs of the multiplier products 5, 6 and 24 are formed following stress results (Fig.5):

U7(t) = V1cos[2Wct+21],

U8(t) = V1cos[2Wc(t1)+22],

< / BR>
where V1=1/2 K1V02;

TO1- transfer coefficient multiplier products, which represent the second harmonic of the channel stress.

It should be noted that the width of the spectrum fc accept QPSK signals U1(t)U3(t) is determined by the duration ofetheir basic packages

fc = 1/e,

whereas the width of the spectrum of the second harmonic is determined by the duration of Twithsignal:

f=1/Twith.

Therefore, when the multiplication of QPSK signals themselves on their range of rolled N times:

fc/f = N.

This circumstance allows to select harmonic oscillations U7(t)U9(t) using narrowband filters 7, 8 and 25, filtering out much of the noise and interference.

If harmonic oscillations U7(t) and U8(t), U7(t) and U9(t) with the output of narrow-band filters 7, 8 and 25 directly apply for phase discerners 10 and 26, the output of the last will receive:

U1() = V2cos(2d1/sin),

U1() = V2cos(2d2

From these ratios it is seen that the voltage at the output of discerners depend on the corners , however, due to the fact that the cosine function is even, the signs U1() and U1() do not depend on the side of the deviation. To eliminate this drawback in measuring channel includes a phase shifter 9, which changes the phase of the harmonic signal U7(t) on the 90o. In this case, the voltage error at the output of the phase discerners 10 and 26 are defined by the expressions:

U1() = V2sin(2d1/sin),

U2() = V2sin(2d2/sin),

The dependences are usually called dynamical characteristics (Fig.3,4).

The steepness of the characteristics in the region of small angles and , where characteristics are almost linear, equal:

< / BR>
< / BR>
Thus, the slope of the characteristics is determined by the magnitude relationship of d1/ and d2/. The increase in database d1d2and decreasing wavelength increase the steepness of the Kand K.

However, this also increases the ambiguity of reference angles and .

The steepness of the characteristics determines the dead zone 2min, 2minfor a given value of the noise VW, (Fig.3,4).

The number of zones neodnoznachen the s:

n1= 2d1/,

n2= 2d2/.

For a single reference, you must choose n1=1 and n2=1, i.e., to choose the measuring base on the basis of the following conditions:

d1<

< / BR>
which are fixed indicators 11 and 27.

The so-formed phase scale reference angular coordinates and precise but ambiguous.

Voltage U4(t) and U5(t), U4(t) and U6(t) from the outputs of the receivers 3 and 4, 3 and 23 simultaneously fed to two inputs of the correlator 12(28), consisting of a block 13(29) adjustable delay, multiplier 14(30) and filter 15(31) of the lower frequencies. Obtained at the output of the correlators 12 and 28 of the correlation function R1() and R2(a) measured by the measuring devices 18 and 34, have a maximum at the value entered adjustable delay:

1=t2-t1,

2=t3-t1,

where t1, t2,t3- time of signal distances R1, R2, R3from the radiation source to the first 1, second 2 and third receiving antennas 22.

The maximum values of R1() and R2() are supported using extreme regulators 17 and 33 acting on the second inputs of the blocks 13 and 29 maintains the values of the angular coordinate and the radiation source QPSK signal:

< / BR>
< / BR>
where1,2- put signal delay corresponding to the maximum correlation functions R1() and R2().

The values of the angular coordinates and fixed indicators 16 and 32. Are timelines of reference angular coordinates and rough, but clear.

Essentially measuring scales are measured fully differential phase:

1= +m1,

2= n+a2,

where m, n is the number of full cycles of the measured differences of the phases defined timelines;

1,2the phase difference measured by the phase angle scales (012, 022).

It should be noted that the location of the receiving antennas 1, 2 and 22 in the form of a geometrical straight angle, the top of which is located in the first receiving antenna 1 measuring channel is dictated by ideology bearing source QPSK signal in space.

The received QPSK signal U4(t) (Fig.5, 6) with the output of the first receiver 3 at the same time is fed to the input of the frequency detector 19, the output of which is formed a short sequence of bipolar pulses (Fig.5, g), whose position on the time axis correspond to the points of abrupt change in phase prinipals throws the trigger 20 in the other stable state of the trigger 20 has two steady state). At the output of the trigger 20 is formed similar modulating code M(t) (Fig.5, a) in a direct M1(t) (Fig.5, e) or return M2(t) (Fig.5, e) codes. While not essential, in the forward or reverse code is analyzed similar modulatory functions (codes). This is because, by analyzing the analog modulation function M(t) emitted from the received QPSK signal in a direct M1(t) or reverse M2(t) code, it is possible to reliably estimate its parameters (the law of phase manipulation, durationeand the number N of elementary parcels). Selection of analog modulation function in the forward or reverse code depends on the initial state of the trigger 20. The selected analog modulation code is recorded by the recording unit 21, where the estimated parameters of the received QPSK signal.

Thus, the proposed phase signal compared to the base object and other similar devices provides bearing the radiation source QPSK signal in the other planes and the estimation of its parameters. Thus the functionality of the phase signal is expanded.

The phase signal containing measurement first and DF channels, while measuring the AC is, the second input is also connected to the output of the first receiver, the first notch filter and phase shifter 90ofirst of DF channel consists of cascaded second receiving antenna, a second receiver, the second multiplier, the second input is also connected to the output of the second receiver, the second narrowband filter, the first phase detector, a second input connected to the first output of the phase shifter 90oand the first indicator of sequentially connected to the output of the second receiver of the first adjustable delay unit, the second input is through the first extreme regulator connected to the output of the first lowpass filter, a third multiplier, a second input connected to the output of the first receiver, the first lowpass filter and the first measuring device, to the second output of the first adjustable delay unit connected to the second indicator, characterized in that it is supplied with the frequency detector, the trigger, the registration unit and the second direction-finding channel, consisting of series-connected third receiving antenna, the third receiver, the fourth multiplier, the second input is also soedinenii connected to a second output of the phase shifter 90oand the third indicator of sequentially connected to the output of the third receiver of the second adjustable delay unit, the second input is a second extreme regulator connected to the output of the second lowpass filter, the fifth multiplier, a second input connected to the output of the first receiver, the second low pass filter and the second measuring device and to the second output of the adjustable delay unit is connected to the fourth indicator, the output of the first receiver serially connected frequency detector, trigger and registration unit, the receiving antenna is placed in the geometric form of a right angle, the apex of which is located the first receiving antenna of the measuring channel, total for the direction-finding receiver antennas channels.

 

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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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