EA007857B1 - Multilink radar system operating on the basis of “forward-scattering” - Google Patents

Abstract

The invention relates to radar, particularly to the «forward-scattering» radar, and can be used for automatic detection, tracking, coordinate measuring and target identification, including low-altitude targets and small targets, for forming early detection and warning radar barrier of any given shape and extension.The technical result of the offered invention, multilink radar system, which operates on the basis of «forward-scattering» method, is creation of air target detection strip, which can be any extension and configuration.Multilink radar system, operating on the basis of «forward-scattering» radar, consists of N≥2 transmitter-receiver posts that are located a field along the contour of any shape and length. Each transmitter-receiver post contains series connected transmitter 1 and transmitting antenna 2, series-connected receiving antenna 3 and receiving device 4, special-purpose computer 5, the input of which is connected with the output of the receiving device 4; equipment of radio-relay communication 6, two communication antennas 7 and 8, which are directed to different adjacent transmitter-receiver posts; and remote operator workstation 9. All the antennas and transmitter 1 are located on the same antenna and mast assembly 10. At that, transmitting antenna 2 of one transmitter-receiver post is directed to the receiving antenna 3 of the neighboring transmitter-receiver post. The input-output of the communication antennas 7 and 8 is connected respectively with the first and the second input-output of the radio-relay communication equipment 6, whose third input-output is connected to the first input-output of the special-purpose computer 5, the output of which is connected with the input of transmitter 1. Remote operator workstation 9 is connected to the second input-output of the «master» transmitter-receiver post; this post can be any of transmitter-receiver posts.

Description

The invention relates to radar, in particular to radar with the detection of "light", and can be used for automatic detection, tracking, measurement of coordinates and target recognition, including low-altitude and small, for the formation of the radar line of early detection and prevention of any given configuration and extent.

The possibility of radar "to the light" is known for a long time [1-3]. The main unique properties of radar "to the light", in the first place, include a sharp (by several orders of magnitude) increase in the effective area of scattering (EPR) of objects falling within the line of sight between the transmitter and the receiver;

fundamental independence of EPR in scattering forward from the presence of a radio absorbing coating on the object.

Known bistatic radar (radar), presented in the Eurasian application No. 200401555/26 dated 12/23/2004, containing the transmitting post as part of the transmitter and transmitting antenna, the receiving post as part of the receiving antenna and the receiving device. In addition, the radar contains a remote operator's workplace (OWS), connected to the receiving post.

The disadvantage of this radar is a small (up to 50 km) length of the radar detection band.

To increase the length of the radar detection band using the above-mentioned radar, you can create a multi-link radar complex, which operates according to the “lumen” location method. In this case, the multi-link radar complex (MRLK) will consist of several radar stations and an external OWS connected to the receiving position, with the transmitting and receiving posts of the neighboring radar stations being installed at one point. The two above-mentioned transceiver posts form one link.

The disadvantage of this complex is its cumbersome due to the need to install 2 antenna-mast devices in one place, the absence (necessary for the concentration of radar information in one place) communication between the individual posts, as well as between the posts and the remote OWS.

For the prototype we take the radar with the detection of "on the lumen", presented in the Eurasian application number 200401555 from 12/23/2004

The technical result of the invention is to create a radar detection band for air objects of any length and configuration.

To achieve this technical result, N> 2 posts are used, which are located on the ground along the contour of any configuration and length. Each of the posts contains a receiving antenna, a receiving device, a transmitting antenna, a transmitter, radio relay communication equipment, two communication antennas and a specialized digital computer for information processing. Thus, for radar signals, the post becomes transceiver, in one direction - receiving, and in the other - transmitting.

In addition, the remote OWS can connect to a specialized digital computer of any transceiver post.

The block diagram of the proposed ILCC presented in the drawing. In the diagram, the following notation:

- transmitter;

- transmitting antenna;

- receiving antenna;

- receiving device;

- specialized digital computing machine (CCVM);

- radio relay communication equipment;

- the first connected antenna;

- the second connected antenna;

- remote operator workplace (RMO);

- Antenna mast device (AMU).

Thus, the multi-link radar complex (MRLK), operating according to the “clear” location method, consists of N> 2 transceiver posts (SPT) located on the ground along the contour of any configuration and length, and an external OWS associated with a specialized digital computer "Leading" PIP cable communication channel. "Lead" can be any of the PPP.

Each transceiver station contains serially connected transmitter and transmitting antenna, serially connected receiving antenna and receiving device, a specialized digital computer whose input is connected to the output of the receiving device, radio relay communication equipment, two directed to different adjacent RFP communication antennas and a remote operator workplace. All antennas and transmitter are located on one antenna-mast device. Moreover, the transmitting antenna of one RFP is directed to the receiving antenna of the neighboring RFP,

- 1 007857 input-output of communication antennas is connected respectively to the first and second input-output of radio relay communication equipment, the third input-output of which is connected to the first input-output of a specialized digital computer, the output of which is connected to the input of the transmitter. The remote OWS is connected to the second input-output of the “master” RFP.

The proposed IRLK works as follows. Transmitter 1 generates a continuous quasi-harmonic signal emitted as a first transmitting and receiving station in the direction of the second receiving and transmitting station as a probe in the wide angle sector of the transmitting antenna 2.

The receiving antenna 3 of the second transceiver station in the general case is a multipath, in this particular case - three-beam. The central beam of the receiving antenna 3 with its maximum is directed to the transmitting antenna 2 of the first transceiver station, while the other rays are deflected from the central beam by ± 15 °, overlapping the zone of the translucent effect. The receiving device 4 operates in a manner similar to the equipment of the receiving station of the known radar prototype.

In the receiving device 4, the main receiving channels are formed, at the outputs of which Doppler beats of the signal frequency occurring when air objects move in the lumenal zone between the transmitting antenna 2 and the receiving antenna 3. The ratio of signals in the receiving channels is uniquely related to the azimuth of the object. Received by the receiving antenna 3, the echo signals in the receiving device 4 are amplified, pre-processed and converted into digital form.

In addition, in the receiving device 4 is rejection of the direct signal of the transmitter 1 and the passive interference signals. Signals of the receiving channels, converted to digital form, are fed into the PCLM 5.

The following processing algorithms are implemented in the PCL 5:

measurement of primary parameters of air objects: azimuth and Doppler frequency; functional transformation of measured parameters into plane coordinates X, Υ; tracking objects by plane coordinates;

recognition of classes of air objects.

Data exchange between the transceiver posts is carried out over the air. The communication channel is half-duplex: in one direction, the radar information and data on the installed modes of operation are transmitted, in the other, the necessary commands to control the operating modes of the posts and radio relay stations. For the organization of the radio communication channel, radio relay communication lines are used (radio relay communication equipment 6 and communication antennas 7 and 8).

In the communication channel between the RFP, the exchange method is used according to the “request-response” principle; in the absence of the subscriber (RFP) information, it operates in the receive mode.

The collection of radar information is carried out on the "leading" RFP, which has radio channels of communication only with neighboring posts. The process of gathering information is carried out by broadcasting or addressing requests with the OWS 9, transmitted sequentially, in all directions, from the “master” NLP. Broadcast requests are accepted and processed by all RFPs; address requests are processed only by that RFP whose address matches the address field in the request. When receiving such a request, all RFPs expect data to pass from the previous RFP (from the side opposite to the RMO). Each RFP provides its information over the air only after passing information from previous RFP.

After all the information from all the RFPs has been collected at the “master” RFP, it sends a request to the RMO about readiness for reception, and, if it is ready, information is issued for the RMO from the “master” PIU, which is remote from the remote RMO more than 500 m, via a standard exchange channel (cable communication channel) in accordance with agreed and approved codograms.

Thus, the proposed multi-link radar complex, which implements the radar principle “through the light”, makes it possible to form the radar line for early detection and warning of any given configuration and length, providing detection, tracking and determination of the coordinates and parameters of the trajectories of small-sized low-flying air targets, including strategic cruise missiles and targets made using Stealth technology, as well as recognition of detected targets.

The claimed technical solution is implemented in IRLK, currently being developed by the Nizhny Novgorod Research Institute of Radio Engineering.

Claims (1)

CLAIM A multi-link radar complex with detection "to the light" containing a transmitting post with a serially connected transmitting antenna and a transmitter, a remote receiving post with a serially connected receiving device and a receiving antenna directed toward the transmitting antenna, and the operator’s remote workplace, characterized in that the transmitting antenna, transmitter, receiving antenna and receiving equipment are located at one transceiver station, the number of which is N> 2 and which are located at The terrain has a configuration of any configuration and length, with each relay transceiver station having radio relay communication equipment with two communication antennas directed to neighboring posts, the input output of which is connected to the first and second input radio output of the radio relay communication equipment, the third input output of which connected to the input-output of the introduced specialized digital computer, the input of which is connected to the output of the receiving device, and the output to the input of the transmitter, with all the antennas and transmitters to at one antenna-mast unit and a tanker operator position can be connected to the second input-output