RU2254605C2 - Device for transforming angular movement of antenna of radiolocation station - Google Patents

Abstract

FIELD: control systems.

SUBSTANCE: device has sensors block, block for forming signals of azimuth binary code, two adders, strobes forming block, control block, rotation imitator, correction code detector, clock pulse generator, binary counter, multiplexer, operative and constant memory devices, static register.

EFFECT: higher speed of operation.

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Description

The invention relates to control systems and regulation of non-electrical quantities, namely, devices for converting non-electrical quantities into electrical signals.

The device can find application in radar, space technology and communication systems - where the task of converting the angular displacement of the antenna into a digital code is solved.

A known system for converting the angular displacement of a radar antenna, comprising a sensor unit with an input for connecting the antenna shaft and serially connected rotation simulator, an angular information converter and a strobe forming unit, the output of the sensor unit being connected to the second input of the angular information converter.

This system has higher accuracy compared to the previous one, since it does not have an intermediate rotation follower, however, this system also does not allow fast and easy orienteering, because it has the drawback of the previous system, namely the need for mechanical rotation of the sensors.

Of the known devices for converting the angular displacement of the radar antenna, the closest in technical essence to the proposed device is the conversion of the angular displacement of the radar antenna, comprising a series-connected sensor unit, an azimuthal binary code signal generation unit, an adder and a strobe generation unit, as well as a rotation simulator, which is connected to the second input of the azimuthal binary code generating unit, the code sensor that is connected to the second input of the adder, and the control unit, cat The other is connected to the output of the adder.

The sensor unit converts the angular displacement into discrete information in the form of unitary codes received at the first input of the signal generating unit of the azimuthal binary code. To the second input of this unit, similar unitary codes are received from the rotation simulator, which are necessary for operation in the simulation of rotation of the antenna. The signal generating unit of the azimuthal binary code generates a binary azimuth code, which is fed to the first input of the adder. A binary correction code is supplied to the second input of the adder from the code sensor. The output signals of the adder are fed to the strobe forming unit and to the control unit.

The advantage of the prototype device is the ability to orient it with minimal time due to the operational input of the binary correction code and, in addition, the high accuracy of the angle conversion. However, the latter valuable quality can be realized provided that the antenna rotational speed is stable. The fact is that the azimuthal information in the radar should be delayed for the time of accumulation and processing of signals in the radar receiver. Therefore, an additional angular correction corresponding to the known time delay is introduced into the azimuth code. In practice, this is expressed in the fact that during the orientation operation, the code generated by the conversion device is reduced by

β ₃ = wt ₃ ,

where β ₃ - the amount of delay in angle

ω is the angular velocity of rotation of the antenna,

t ₃ - delay time of the signal in the receiver.

If the antenna rotation speed is unstable, then

β ₃ = ω ₀ t ₃ ± Δωt ₃ ,

where ω ₀ is the average value of speed,

Δω is the change in speed.

Since in some radars the value of Δω can reach 10%, then the velocity error of the azimuth code will be of the same order. This is a significant disadvantage of the prototype device.

The technical result of the proposed invention is to increase the accuracy of the conversion of angular displacement by eliminating the speed conversion error.

The technical result is achieved in that in a device for converting the angular displacement of a radar antenna, comprising a series-connected sensor unit, an azimuthal binary code signal generation unit and an adder combined at the input of the strobe generation unit, and a control unit, a rotation simulator connected to the second input of the formation unit signals of the azimuthal binary code, and the code sensor connected to the second input of the adder, according to the invention, series-connected clock generator pulses, a binary counter, a second adder, a multiplexer, random access memory and a static register, the output of which is connected to the input of the strobe forming unit, a read-only memory connected to the second input of the second adder, the first input of which is additionally connected to the second input of the multiplexer.

The novelty of the invention follows from the fact that in the descriptions of the known devices there is no information about eliminating or compensating for the speed error of the angle code.

Analysis of the known technical solutions showed that the introduced elements are known per se, however, their combined use allows us to obtain a new technical result, and this gives reason to conclude that the proposed technical solution meets the criteria of the invention of "inventive step".

The presence of a causal relationship between the totality of the essential features of the claimed invention and the achieved technical result is due to the fact that replacing the angular delay of the azimuthal information with a time delay caused an increase in the accuracy of the conversion of angular displacement at an unstable antenna rotation speed.

The invention is illustrated by the following description and graphic materials. In Fig.1 and 2, respectively, a device for converting angular displacement is a prototype and the proposed device for converting angular displacement, where it is indicated:

1 - sensor block;

2 - block generating signals of the azimuthal binary code;

3 - adder;

4 - block forming gates;

5 - control unit;

6 - rotation simulator;

7 - code sensor;

8 - clock generator;

9 - binary counter;

10 - second adder;

11 - multiplexer;

12 - random access memory;

13 - static register;

14 - read only memory.

Figure 3 presents a variant of the control unit, where it is indicated:

DD ₁ - the converter of the binary code into the signals of the seven-segment code,

DD ₂ -DD ₅ - digital code indicators.

Figure 4 presents a variant of the sensor circuit code, where indicated:

DD ₁ - generator of a logical unit,

DD ₂ - logical zero generator,

S ₁ -S ₁₂ - switch bits of the code.

The proposed device comprises a series-connected sensor unit 1, an azimuthal binary code signal generating unit 2 and a first adder 3, combined at the input of the strobe forming unit 4, and a control unit 5, a rotation simulator 6 connected to the second input of the azimuthal binary code 2 signal generating unit, and a code sensor 7 connected to the second clock input 8, a binary counter 9, a second adder 10, a multiplexer 11, a random access memory 12 and a static register 13, the output of which is connected with the input of the strobe forming unit 4, a read-only memory 14 connected to the second input of the second adder 10, the first input of which is additionally connected to the second input of the multiplexer 11.

A variant of the control unit circuit shown in FIG. 3 comprises a binary code to seven-segment code signal with inputs for connecting a binary code and digital indicators of the DD ₂ -DD ₅ code, the inputs of which are connected to the outputs of the DD ₁ converter.

An embodiment of the code sensor circuit shown in FIG. 4 comprises a logical unit generator, logical zero generators on ICs that perform the NOT function, and binary code bit switches that switch logical zero and logical unit signals.

The proposed device operates as follows.

The sensor unit 1 converts the angular displacement of the antenna (not shown in the figures) into discrete information in the form of pulse signals that are fed to the first input of the signal generating unit, which are fed to the first input of the signal generating unit of the azimuthal binary code 2. To the second input of this unit from the simulator rotation 6 receives the same impulse signals necessary for operation in the simulation mode of rotation of the antenna. The signal generating unit of the azimuthal binary code 2 generates a binary azimuth code, which is fed to the first input of the adder 3. A binary correction code is applied to the second input of the adder 3 from the code sensor 7 to "bind" the azimuth information to the true North. From the output of the adder 3, the azimuthal code is fed to random access memory 12 (RAM), where it is stored for a time t ₃ . Writing and reading information of RAM 12 is carried out according to signals from the multiplexer 11. The write address code is supplied to the multiplexer 11 from the binary counter 9, the input of which is supplied by pulses from the clock 8. The read address code to the multiplexer 11 is supplied from the second adder 10, which produces the addition of the current code of the counter 9 with the code recorded in the read-only memory 14 (ROM). The ROM code is the digital equivalent of a delay time t ₃ .

Thus, the azimuthal information read from the RAM 12, is delayed by time t ₃ in relation to the information from the output of the adder 3. The static register 13 stores the azimuthal information in the intervals between reading the code from the RAM 12. The azimuth code from the output of the static register 13 is received to the block forming gates 4 and to the control unit 5.

Such a construction scheme of the conversion device eliminates the need to introduce an additional code of information to account for the delay of azimuthal information during the accumulation and processing of the signal in the path of the radar receiver and, therefore, increase the accuracy of the conversion of the angular displacement of the antenna with an unstable speed of rotation.

The technical result of the invention is to increase the accuracy of the conversion of angular displacement by eliminating the speed error of the binary angle code.

Claims (1)

A device for converting the angular displacement of the antenna of a radar station, containing a series-connected sensor unit, an azimuthal binary code signal generation unit and an adder combined at the input of the strobe generation unit and a control unit, a rotation simulator connected to the second input of the azimuthal binary code signal generation unit, and a sensor correction code connected to the second input of the adder, characterized in that the device is introduced in series connected clock generator of pulses, a binary counter, a second adder, a multiplexer, random access memory, which receives an azimuth code from the adder, and a static register, the output of which is connected to the input of the strobe forming unit, a read-only memory connected to the second input of the second adder, the first input of which is additionally connected to the second input of the multiplexer.

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