RU2246120C1 - Device for estimating angular coordinates of targets for radiolocation station with phased antennae grid - Google Patents

Abstract

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 U_x = cos(90°-α₀) to signal of guiding cosine of radio signal direction relatively to normal line to plane of phased antennae grid opening U_z = cosα₀, serving for automatic correction of calibrating voltage on basis of law U_z=cosα₀.

EFFECT: higher precision.

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Description

The invention relates to radar meters of the angular coordinates of targets, and in particular to devices for estimating the angular coordinates of targets for a radar with a phased antenna array (PAR) performing electronic scanning of space.

A device is known for estimating the angular coordinates of targets for a radar, comprising a zero indicator (IO) of a direction-finding error signal (STR) for fixing a zero value of the angular coordinate α = 0 at the moment of combining an equal-signal direction (RSN); for example [L.1, Fig. 4, p.11], [L.2], [L.3], etc. However, the known devices do not provide estimates of the angular coordinates of targets when their position is shifted relative to the RSN, i.e. for α ≠ 0.

Also known are devices for estimating the angular coordinates of targets both on the RSN and outside it, for example [L.4, Fig. 10.9 on p.297]; [L.5, Fig.2.7b on p.109]; [L.6] and others.

Of the known devices closest in technical essence to the proposed device is [L.4, Fig. 10.9. on p.297].

This device, the functional diagram of which is shown in figure 1 of the attached drawings, contains a divider 1 and a calibration voltage source 2 corresponding to the radar direction-finding sensitivity (slope μ _{0 of} its direction-finding characteristic) on the RSN, combined with the normal to the aperture plane of the antenna, the first input of the divider 1 is the input of the device for the signal direction finding error U _p coming from the radar, the second input of the divider 1 is connected to the specified source 2, and the output of the divider 1 is the output of this device target angular coordinates

A disadvantage of the known device is the decrease in the accuracy of estimating the angular coordinates of targets for radars with a phased array when the RSN deviates from the normal to the aperture plane of the phased array. Thus, the measured radar signal with a PHAR signal of a direction-finding error U _p depends not only on the angular coordinate of the target α (i.e., the angle of deviation from the RSN), but also on the angle α _{0 of the} deviation of the RSN from the normal to the open plane of the PAR, for example [L .7 chap. 13, p. 360-369]. Moreover, for a linear section of direction-finding characteristics near the RNS

However, the calibration voltage used in the known device does not take into account the indicated dependence on α ₀ .

As a result, the angular coordinate α is estimated by a known device accurate to cosα ₀

The technical problem solved by this invention is to eliminate this drawback, namely, improving the accuracy of estimating the angular coordinates of targets for radars with headlights when the RSN does not coincide with the direction of the normal to the plane of the headlights opening, i.e. for α ₀ ≠ 0.

The problem is solved in that in the device for evaluating the angular coordinates of targets for radar with a phased array containing a divider and a calibration voltage source corresponding to the direction-finding sensitivity of the radar on the RSN, combined with the normal to the aperture plane of the phased array, and the first input of the divider is the input of the device for the direction-finding error signal , and the output of the divider is the output of the device, an additional multiplier and a converter of the signal of the guide cosine of the PCN angle relative to the opening plane of the HEADLIGHT into a signal are introduced the directing cosine of the PCN angle relative to the normal to the opening angle of the PAR, the input of the converter is the input of the device for the radar signal of the same name, and the outputs of the converter and the source of the specified calibration voltage are connected through the multiplier to the second input of the divider.

The introduced differences (multiplier, signal converter, and their functional relationships) increase the accuracy of estimating the angular coordinates of targets by automatically correcting the calibration voltage μ ₀ from the value of U _z = cosα ₀ .

Figure 1 shows a functional diagram of a known device selected as a prototype.

Figure 2 shows a functional diagram of the proposed device.

The proposed device (figure 2) contains:

- divider 1 and source 2 of the calibration voltage μ ₀ , which are identical to the same blocks of the prototype in figure 1;

- Converter 3 of the signal of the directional cosine of the angle of the RSN relative to the plane of the aperture of the PARA U _x = cos (90 ° -α ₀ ) to the signal of the directional cosine of the angle of the RSN relative to the normal to the plane of the opening of the PAR

- the multiplier 4, forming the adjusted value of the calibration voltage μ ₀ · cosα ₀ .

A converter 3 that performs the specified function is described in the scientific and technical literature, for example, in [L.8, section 3.3, p.70].

The multiplier 4 is a typical element of the receiving devices, for example [L.9, Fig. 1.10, p.30].

A radar with a PAR, having outputs for direction-finding error signals U _p and a direction cosine U _x = cos (90 ° -α ₀ ), is known, for example, from [L.8, Fig. 8.4 on p.267 and Fig. 8.18 on s .298 et al.].

The proposed device operates as follows.

The direction-finding error signals U _p measured by the radar with the PHAR are fed to the first input of the divider 1, and the direction cosine signals U _x = cos (90 ° -α ₀ ) are input to the converter 3, which generates the direction cosine signal U _z = cosα ₀ at its output.

The signal U _z and the calibration voltage μ _{0 of the} source 2 through the multiplier 4 are fed to the second input of the divider 1 in the form

The output signal of the divider 1, taking into account the ratios 1 and 3, is determined as follows:

от угла α ₀. С учетом соотношений 2 и 4, достигаемый выигрыш в точности оценки угловой координаты составляетThus, the introduced differences eliminate the dependence of the obtained estimate of the angular coordinate

from the angle α ₀ . Given the ratios 2 and 4, the achieved gain in the accuracy of estimating the angular coordinate is

and for α ₀ = 60 ° it is equal to two.

Literature

1. P.I. Dudnik. Monopulse devices. Series RT (Results of science and technology), M., VINITI, 1972

2. Japanese Patent No. 498896, pending. 01/18/74, G 01 S 9/44.

3. Patent RU 2144199, pending. 07/28/89, G 01 S 3/10.

4. P.I. Dudnik, Yu.I. Cheresov. Aviation radar devices. Ed. VVIA them. N.E. Zhukovsky, 1986

5. A.M. Zufrin. Methods of building ship automatic goniometer systems. Ed. Shipbuilding, Leningrad, 1970

6. Copyright Certificate 207759, filed 07/11/83, G 01 S 3/22.

7. Theoretical foundations of radar. Ed. V.E.Dulevich, Sov. Radio, M., 1978

8. A.A. Korostelev. Spatio-temporal theory of radio systems. Radio and communications, M., 1987

9. Design of radar receiving devices. Ed. M.A.Sokolova, Higher School, M., 1984

Claims (1)

A device for evaluating the angular coordinates of targets for a radar with a phased array antenna (PAR) containing a divider and a calibration voltage source corresponding to direction-finding sensitivity in the direction normal to the aperture plane of the PAR, and the first input of the divider is the input of this device for a radar direction finding error (STR) signal, and the output of the divider is the output of this device, characterized in that it additionally includes a multiplier and a signal converter of the directional cosine of the angle equal to the signal the first direction (PCH) relative to the plane of the aperture in the FAS signal PCH cosine of the angle of the guide relative to the normal to the plane of the aperture phased arrays, the input of said inverter is the input of the device for homonymous radar signal, the inverter output voltage and the calibration source through a multiplier connected to the second input of the divider.

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