RU2279690C1 - Arrangement for processing of radiolocation signals - Google Patents

Abstract

FIELD: the invention refers to the field of radiolocation and may be used in systems for searching and tracking of air objects.

SUBSTANCE: the essence of the invention is in that the arrangement for processing of radiolocation signals increases accuracy of definition of the direction due to an introduced constant memory , a divisor, a decode of a whole number and a single-address constant memory connected in a definite manner.

EFFECT: increase of accuracy of definition of direction of the signal on the tracking target.

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Description

The invention relates to the field of radar and can be used in search and tracking systems for airborne objects.

A device for processing radar signals is described in the book: "Radio Engineering Systems" Yu.M. Kazarinov, 1991, Moscow, p. 383. In it, using the analysis of the envelope maximum, the direction to the object is determined when using a single-channel receiver with a rotating radiation pattern. However, with an increase in the viewing speed, two or one signal can be received, which can also be elongated. In this case, the accuracy of determining the direction decreases.

A device for processing radar signals is described in patent No. 2247408, application No. 2003122991/09. It can carry out information processing during rotation of the combined transmitting and receiving radiation patterns. At the same time, the selected signals from the receiver output go to the amplitude conversion block into the code, from where the code goes to the second group of subtractor inputs and through the block of parallel delay lines to the first group of inputs of this subtractor. The magnitude of each delay line is, for example, the maximum delay time of the reflected signal or the time equal to a certain duration of the elongated signal, if it is single. The difference from the subtraction of the amplitude codes characterizes the angular position of the object, which is further added to the current value of the azimuth code from the azimuth sensor in the adder and the true value of the direction to the object enters the secondary processing unit, which implements the construction of the trajectory of the objects. The azimuth code also enters the first group of inputs of the secondary processing unit for its use in the presence of other devices, in particular, a range sensor, the range code from which can also enter this unit. However, the accuracy of determining the direction depends on the distance, since at the time of receiving the signal reflected from the object, the rotating radiation pattern will rotate by a certain angle, which will introduce an error in measuring the direction, since the signal gain will change due to the nonlinearity of the radiation pattern of the receiver.

Using the proposed device increases the accuracy of determining the direction. This is achieved through the introduction of read-only memory, divider, integer decoder and unicast read-only memory.

In figure 1 and in the text, the following notation.

1 - receiver with a rotating radiation pattern;

2 - azimuth sensor;

3 - block conversion of the amplitude in the code;

4 - block of parallel delay lines;

5 - subtractor;

6 - integer decoder;

7 - read-only memory;

8 - divider;

9 - adder;

10 - unicast read only memory;

11 - block secondary processing;

12 - range sensor

while the output of the receiver with a rotating radiation pattern 1 is connected to the input of the amplitude conversion unit into code 3, having a group of outputs connected to the second group of inputs of the subtractor 5 and through the block of parallel delay lines 4 connected to the first group of inputs of the subtractor 5, and the group of outputs of the azimuth sensor 2 is connected to a first group of inputs of an adder 9 having a group of outputs connected to a first group of inputs of a secondary processing unit 11 having a second and third group of inputs respectively connected to a group of outputs azimuth sensor 2 and with a group of inputs of the range sensor 12, moreover, the group of outputs of the subtractor 5 is connected to the first group of inputs of the permanent storage device 7, having a group of outputs and a second group of inputs, respectively connected to the second group of inputs of the adder 9 and through an integer decoder 6 with the group of outputs of the divider 8, the first and second group of inputs of which are respectively connected to the group of outputs of the range sensor 12 and to the group of outputs of the unicast permanent memory 10.

The operation of the device is as follows.

In the receiver with a rotating radiation pattern 1, electromagnetic signals are converted into electrical signals and their selection according to their characteristics. In this case, the transmitting and receiving radiation patterns are combined. The selected signals are sent to the amplitude conversion unit in code 3, from where the code is fed to the second group of inputs of the subtractor 5 and through the block of parallel delay lines 4 to the first group of inputs of this subtractor. The value of each delay line is equal to the maximum delay time of the reflected signal or time equal to a certain duration of the elongated signal, if it is single, and the number of delay lines is equal to the value of the bits of the parallel code. The difference from the subtraction of the amplitude codes, which characterizes the unspecified direction to the object in the zone of the receiving radiation pattern, goes to the first address input of the permanent storage device 7. At the same time, coarse information about the distance to the object from the decoder of the integer 6 is received, in the form of information only the whole numbers.

The roughening is carried out by dividing the range code in the divider 8 from the range sensor 12 by the number wired in the unicast read-only memory 10. The first and second address inputs of the read-only memory 7 serve to select the address from which the updated direction information in the zone of the receiving radiation pattern is read , which is pre-sewn in the setup process for all range values. The difference between the refined direction and the deepened direction is explained by the fact that by the time of arrival of the signal reflected from the object, the radiation pattern will rotate at some angle at which the signal gain will change due to the nonlinearity of this diagram. The adjusted angular position of the object in the field of view of the receiver with the rotating radiation pattern 1 from the output of the permanent storage device 7 is supplied in the form of a code to the adder 9, where it is added with the current position of the azimuth code from the azimuth sensor 2 and the true position of the direction to the object is sent to the secondary processing unit 11 constructing the trajectory of the movement of objects. The design of the azimuth sensor, which outputs information in the form of a code, is presented in the aforementioned source on page 414. The secondary processing unit 11 also receives range information from the range sensor.

The performance of the range sensor, which can be a range converter, is presented, for example, in the book: Vasin V.V., Stepanov B.N. "Reference book on radiolocation", 1977, p. 214.

To clarify the clarification of the direction, we use figure 2, which shows the envelope and the following notation:

13 - the moment of radiation of the signal in the direction of two objects located in the same direction;

14 - the moment of arrival of the signal from the near object;

15 - the moment of arrival of the signal from the distant object.

As can be seen from figure 2, the temporary discrepancies Δt ₁ and Δt ₂ depend on the range. Thus, with the known value of the coarse direction from the subtractor 5 and the distance from the decoder, the addresses in the read-only memory 7 are determined where the corresponding specified directions are sewn up in the form of information that would take place in the subtractor 5 if there were a receiving diagram between the moments of emission and reception of signals directivity did not rotate. The accuracy of determining the direction depends on the fluctuation of the signals and can be a value equal to 0.03-0.05 of the width of the receiving diagram. Increasing the accuracy of determining the viewing time improves the quality of the construction of the trajectories of rapidly moving objects.

The device can be used in radars with rotating radiation patterns.

Claims (1)

A device for processing radar signals, consisting of a receiver with a rotating radiation pattern, an azimuth sensor, an amplitude to code conversion unit, a subtracter, a block of parallel delay lines, an adder, a secondary processing unit and a range sensor, while the output of the receiver with a rotating radiation pattern is connected to the input of the block converting the amplitude to a code having a group of outputs connected to the second group of inputs of the subtractor and through a block of parallel delay lines connected to the first group of inputs of the subtractor, and the group of outputs of the azimuth sensor is connected to the first group of inputs of the adder having a group of outputs connected to the first group of inputs of the secondary processing unit having the second and third groups of inputs respectively connected to the aforementioned group of outputs of the azimuth sensor and to the group of outputs of the range sensor, characterized in that a read-only memory, a divider, an integer decoder and a unicast read-only memory are introduced, wherein the group of outputs of the subtractor is connected to the first group of inputs of a permanent storage device having a group of outputs and a second group of inputs respectively connected to the second group of inputs of the adder and, through an integer decoder, to the group of outputs of the divider, the first and second groups of inputs of which are respectively connected to the group of outputs of the range sensor and to the group of outputs of unicast read-only memory device.

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