RU2447456C1 - Device to process radiolocating signals - Google Patents

Abstract

FIELD: radio engineering.

SUBSTANCE: device comprises a direction-finding receiving device, a unit of beam movement fixation, a counter, a unit of pack centre detection, a unit of matching elements, a long-term storage and a subtractor, where a separate output of the direction-finding receiving device and a group of its outputs are accordingly connected: via the unit of the pack centre detection with an input of the matching elements unit and with the group of inputs of this unit, having a group of outputs connected with the group of inputs of the long-term storage, and the output of the beam movement fixation unit is connected with the input of the counter differing by the fact that the following components are introduced: a sensor of azimuthal marks with second resolution and a counter of marks, at the same time the output of the sensor of azimuthal marks with second resolution is connected to the first input of the counter of marks, having the second input connected to the output of the unit of beam movement fixation, the counter of marks has a group of outputs connected to the first group of inputs, the subtractor, the second and third groups of inputs of which are accordingly connected to the group of outputs of the counter and with the group of outputs of the long-term storage.

EFFECT: provision of accuracy of distance detection without use of complicated units.

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Description

The invention relates to the field of radar and can be used in radars to search and track objects.

A device for processing radar signals, which is part of the radar set forth in the patent No. 2161807 of the author, is known. It carried out the determination of the range at an increased frequency of the probe pulses, using direction values determined in the direction-finding receiver by the single-pulse method. The directions of the radiation of the probe pulses and the times of these radiations are also remembered. The range is determined in the subtractor between the corresponding memorized time at the moment of fixing in the direction finding receiver of the previously memorized direction and the current time. However, the accuracy of determining the range is not always sufficient. A device for processing radar signals is described in the patent No. 2390037, author Chasovskaya A.A .; it increases the accuracy of determining the range at an increased frequency of the radiation of the probe pulses due to the determination of the center of the packet from the direction-finding receiver in the block center determination unit. The central impulse enters the block of matching elements, allowing the passage of direction from the direction-finding receiver to the permanent storage device. In this device, the directions that most closely coincide with the corresponding directions of the transmitting beam at the time of radiation of the probe pulses fixed by the counter are combined into directions at the moments of radiation of these pulses. In this case, the pulses to the input of the counter are received from the block for recording the movement of the beam at the moments of rotation of the beam by a certain amount, similarly to the sensor of azimuth marks or phasing unit. The values of directions from the counter at the moments of radiation of the probe pulses and the times of these emissions are also remembered. The range is determined in the subtractor between the corresponding stored time and the current time. However, to increase the accuracy of determining the range, complex nodes, in particular random access memory, time sensors, and additional logical nodes, are required. Using the proposed device ensures the preservation of the accuracy of determining the range without the use of complex nodes. This is achieved by introducing a second-resolution azimuthal mark sensor and a mark counter, while the second-resolution azimuth mark sensor output is connected to the first input of the mark counter having a second input connected to the output of the beam movement fixation unit having a group of outputs connected to the first group of inputs a subtractor, the second and third groups of inputs of which are respectively connected to the group of outputs of the counter and to the group of outputs of the permanent storage device.

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

1 - direction finding device;

2 - Block fixing the movement of the beam;

3 - counter;

4 - Block matching elements;

5 - Unit for determining the center of the pack;

6 - read-only memory;

7 - Sensor azimuth marks with a second resolution;

8 - Tag counter;

9 - Subtractor.

In this case, the output of the block for fixing the movement of the beam 2 is connected to the input of the counter 3 and to the second input of the tag counter 8, which has a first input and a group of outputs, respectively connected to the output of the azimuth mark sensor with a second resolution of 7 and with the first group of subtractor inputs 9, the second and third the groups of inputs of which are respectively connected: with the group of outputs of the counter 3 and through read-only memory 6 with the group of outputs of the block of matching elements 4, having an input and group of outputs, respectively connected: through the block the center of the pack 5 with a separate output of the direction finding receiver 1 and with a group of outputs of this device.

The device operates as follows.

The block for fixing the movement of the beam 2 at the time of rotation of the beam by a certain amount gives an impulse, including as a command for the emission of the probe pulse during the rotation of a narrow transmitting beam. The number of these pulses is calculated using a counter 3, which is automatically set to its original state after a certain number of pulses.

During the rotation of the transmitting beam, the values at the outputs of the counter 3 characterize the angular values at the moments of radiation of the probe pulses during one review. The block for fixing the movement of the beam 2 works similarly to the azimuth sensor, which after a certain angle of movement of the beam gives a signal. When using a phased antenna array, successive pulses are received from the phasing control unit, which performs the functions of the aforementioned unit 2. After a certain number of signals at the end of the review, it is independently set to its initial state. In contrast to the main analogue, an azimuthal mark sensor with a second resolution of 7 and a mark counter 8 are introduced into the proposed device.

The sensor of azimuth marks 7 generates successive marks in the counter of marks, which is set to the initial state by a pulse from the block for fixing the movement of the beam 2.

Direction finding device 1 determines by a single-pulse method during the review the direction of arrival of signals reflected from objects. The width of the intersection zone of the diagrams exceeds the width of the transmitting beam rotating synchronously. However, this zone is turned in the direction opposite to rotation. An example of a specific embodiment of a direction-finding receiver, including one working on the aisle, is presented in the book by A.N. Volzhin, Yu.G. Sizov, “Combating Homing Missiles,” M., Military Publishing House, 1983, pp. 37-39 , fig. 1.16.b. Electrical pulses converted from electromagnetic pulses from the output of the direction-finding receiver 1 enter the block center 5 determining unit. The latter, analyzing the packet length, issues, at the moment the central pulse arrives at the coincidence element block 4, permission to pass direction information from the group of outputs of the aforementioned device 1 to the group of inputs of the permanent storage device 6. An example of a specific implementation of the unit for determining the center of the pack is presented, for example, in the book of Yu. M. Kazarinov "Radio engineering systems", M., Higher School, 1990, p. 383.

In the permanent storage device 6, the directions that most closely coincide with the corresponding directions of the central axis of the transmitting beam at the time of emission of the probe pulses detected by the counter 3 are combined in the directions, information about which is stored in the memory of the permanent storage device, and are received from the group of outputs of the permanent storage device 7 to the group of inputs of the subtractor 9. For equidistant values of the directions, the selection of the direction stored in the memory is not carried out and can be performed zvedy at the next review. In the subtractor 9, the current direction is subtracted with the selected in read-only memory. In this case, the current direction consists of a rough direction from the counter 3 and the labels 8 specified from the counter, from the output groups of which the values are respectively sent to the second and first groups of inputs of the aforementioned subtractor 9. As a result, both groups of inputs carry information about the current direction of the central axis of the transmitter ray with second resolution. Thus, sufficient accuracy characteristics in range are ensured when using high-speed integral elements. It should be noted that when using a phased antenna array and uniform stepwise displacement of the beam, a clock generator can be used as a sensor of azimuth marks, where the frequency of clock pulses depends on the period of the beam movement. At the same time, the equal-signal zone of the direction-finding receiver also jumps in synchronism with the transmitting beam. If there are two pulses in the packet, the pulse with a large amplitude is selected as the central one in block 5, since it is closer to the maximum of the diagram. We give an example of a specific application. Let the beam make a circular overview of space. Beam width in azimuth 0.5 ° elevation angle 3 °, the radiation frequency of the probe pulses 2 kHz. After moving the beam for 6 minutes, an impulse is emitted. In synchronism with the transmitting beam, it scans the intersection zone of the receiving diagrams with a width of 3.25 °, which is rotated in the direction opposite to rotation. At the same time, a resolution in the direction of 5 minutes is provided, with a maximum detection range of 600 km. Then the time of the circular review will be 1.1 seconds. It is possible to simultaneously rotate several diagrams.

The proposed device can be used in air traffic control systems, including for rapidly moving targets. Simplification of the device reduces the cost of its manufacture, which provides an economic effect.

Claims (1)

A device for processing radar signals, consisting of a direction-finding receiver, a block for fixing the movement of the beam, a counter, a unit for determining the center of the pack, a block of matching elements, a permanent storage device and a subtracter, where a separate output of the direction-finding receiver and a group of its outputs are respectively connected through the block determining the center of the pack with the input of the block of coincidence elements and with the group of inputs of this block having a group of outputs connected to the group of inputs its device, and the output of the block for fixing the movement of the beam is connected to the input of the counter, characterized in that the input is: a sensor of azimuth marks with a second resolution and a counter of marks, while the output of the sensor of azimuth marks with a second resolution is connected to the first input of the tag counter having a second input, connected to the output of the block for fixing the movement of the beam, and the tag counter has a group of outputs connected to the first group of inputs of the subtractor, the second and third groups of inputs of which are respectively connected to the group of outputs with meter and with a group of outputs of a permanent storage device.