CN215526107U

CN215526107U - Secondary radar with uninterrupted target track during radar channel switching

Info

Publication number: CN215526107U
Application number: CN202121930979.4U
Authority: CN
Inventors: 裴方瑞; 冯永霖; 贾人和
Original assignee: Pei Fangrui
Current assignee: Pei Fangrui
Priority date: 2021-08-17
Filing date: 2021-08-17
Publication date: 2022-01-14
Anticipated expiration: 2031-08-17

Abstract

The utility model discloses a secondary radar with uninterrupted target track during radar channel switching, which comprises an antenna, a rotating hinge, a radio frequency switching unit and two channel devices, wherein each channel device comprises a transceiving multiplexing switch, a transmitter, a receiver and a response processor, and the response processor comprises a signal processor and a data processor; each data processor is respectively connected with the two signal processors to realize the data sharing of the two data processors. Has the advantages that: the main channel and the standby channel share information, and target track information is continuous all the time in the channel switching process, so that the target track is not interrupted when the radar channel is switched, and the influence of the channel switching action on the target information output continuity is reduced to the minimum.

Description

Secondary radar with uninterrupted target track during radar channel switching

The technical field is as follows:

the utility model relates to the field of radars, in particular to a secondary radar with uninterrupted target track during radar channel switching.

Background art:

the aviation management radar is important equipment of an aviation management system and comprises an aviation management primary radar and an aviation management secondary radar, wherein the primary radar monitors a target with reflection to electromagnetic waves, and the secondary radar monitors a cooperative target. The navigation management radar works continuously 24 hours every day and needs to output continuous target information. In order to meet the requirement of high reliability, the aviation management radar generally adopts a dual-channel hot backup redundancy design, when one channel in the dual channels breaks down, the normal channel can be automatically switched to, and the target information output continuity of the whole radar system is ensured.

As shown in fig. 1, the two channel devices of the navigation management radar with the dual-channel structure have the same composition and the same performance and technical index, and a main channel and a standby channel can be defined at will. The single channel is composed of a receiving and transmitting switch, a transmitter, a receiver, a signal processing module and a data processing module. The two channels are relatively independent, and a certain functional module in one channel breaks down, so that the functional and technical indexes of the channel can be influenced, and the functional and technical indexes of the other channel cannot be influenced. And as long as one of the two channels works normally, the target track information and the target track information output by the radar system can be ensured to be normal and continuous. When the dual-channel hot backup radar works normally, one channel is used as a main channel and is connected with an antenna through a rotating hinge, a high-frequency transmitting signal is radiated from the antenna, a high-frequency echo signal is received, and the echo signal is processed to generate target track information and is sent to rear-end ATCC equipment. The high-frequency emission signal of the standby channel is connected with an absorption load, the emission energy is absorbed, and no echo signal exists. Therefore, the transmitting signal and the target information of the radar system are both from the main channel, and the target information output of the radar system is normal as long as the main channel works normally.

When switching operation occurs between two radar channels due to manual operation or equipment failure, the change-over switch is used as a high-power mechanical switch, and the switching operation of the change-over switch usually needs tens of milliseconds to complete. During the switching process, the radar main channel is subjected to the action of separating from the rotating hinge and the antenna, the standby channel is subjected to the action of connecting with the rotating hinge and the antenna, the rotating hinge and the antenna are in a suspended state for a period of time during the switching action, the rotating hinge and the antenna are separated from the main channel and are not reliably connected with the standby channel, and at the moment, the radar system cannot send or receive signals and is in a signal interruption state, namely, the channel switching inevitably causes instant signal interruption, and the signal interruption duration is different according to the difference of the rotating speed of the antenna and the difference of the completion time of the switch.

As the navigation management radar, the information sent to the ATCC includes target track information and target track information. Wherein the trace point information is formed by condensing a plurality of echo signals in the antenna beam dwell, and the trace information is obtained by filtering, smoothing and extrapolating the trace point information. Once the echo signal of the radar is interrupted, the trace point information is lost immediately, the trace information is different, the trace has an extrapolation function, the extrapolation number of turns can be set to be 3 turns, namely, under the condition that the trace point disappears, the trace can output 3 turns of target trace information, and due to the rigor requirement of the radar information, the extrapolated trace information is marked during output and distinguished during display so as to be distinguished from the normal trace. Therefore, how to ensure that the radar does not interrupt the output of the target signal during the switching is a problem to be solved.

The utility model has the following contents:

the utility model aims to provide a secondary radar which ensures that a target track is not interrupted when a radar channel is switched, wherein the radar does not interrupt the output of a target signal when the two channels are switched.

The utility model is implemented by the following technical scheme: the secondary radar with uninterrupted target track during radar channel switching comprises an antenna, a rotating hinge, a radio frequency switching unit and two channel devices, wherein each channel device comprises a transceiving multiplexing switch, a transmitter, a receiver and a response processor, and the response processor comprises a signal processor and a data processor; each data processor is respectively connected with the two signal processors to realize the data sharing of the two data processors.

The utility model has the advantages that: compared with the prior art, the main channel and the standby channel share information, and the influence of channel switching action on the output continuity of target information is reduced to the minimum. Once the channel switching action occurs, the output of the target track information is interrupted by the main channel and the standby channel, but the target track information of the main channel and the standby channel is continuous. When the channel switching action is completed, the standby channel is changed into the main channel, the target track information is immediately generated, the target track information is output to the opposite channel, and the main channel and the standby channel after identity conversion simultaneously output the target track information and the target track information to the rear end ATCC, so that the target track information is continuous all the time in the channel switching process, and the target track is not interrupted when the radar channel is switched.

Description of the drawings:

fig. 1 is a schematic diagram of a two-channel secondary radar in the background art.

FIG. 2 is a schematic composition of the present invention.

The specific implementation mode is as follows:

example (b): as shown in fig. 2, the secondary radar with uninterrupted target track when switching radar channels comprises an antenna 1, a rotating hinge 2, a radio frequency switching unit 3, and two channel devices 4, wherein each channel device 4 comprises a transceiving multiplexing switch 5, a transmitter 6, a receiver 7, and a response processor 8, and the response processor 8 comprises a signal processor 9 and a data processor 10; each data processor 10 is connected to two signal processors 9, respectively, so as to implement data sharing between the two data processors 10. Seamless switching between two channels is realized, and a data exchange channel is added between the channel A and the channel B. Besides the exchange of state information, the data processing A and the data processing B share target track information, taking the channel A as a main channel and the channel B as a standby channel as an example, the data processing A of the main channel sends the generated target track information to the data processing B of the standby channel, and the data processing A and the data processing B respectively generate target track information. The state intercommunication between the data processing A and the data processing B ensures that the two channels know the main/passive state of the channel and whether the channel and the opposite channel are normal or not, and accordingly, the channel switch is automatically switched to the normal channel to serve as the main channel.

In practical use, in order to prolong the service life of the change-over switch and reduce the interference of high-power switching on an electromagnetic environment, the steps of off-transmitting, transmitting a switching command, switching confirmation and on-transmitting are adopted in channel switching to complete switching, wherein the switching confirmation is completed by reading the state of the change-over switch in real time, so that the influence time of the whole switching process on radar signals is longer, generally about 200 ms. The default rotating speed of the air traffic control secondary radar antenna is 4S/revolution, the rotating angle of the antenna is about 18 degrees within 200ms, for convenient observation, 2 display and control terminals of the secondary radar are respectively arranged on a point track display interface and a track display interface, target track information of a certain direction of the point track interface is lost along with the occurrence of switching action, and the number of target tracks of the antenna to be converted is reduced; and a plurality of extrapolated target track information appears in the same azimuth concentration of the track interface, the extrapolation number of the antenna to the target track is increased along with the extrapolation number, the next antenna scanning period is entered after the switching action is completed, and the target track display and the statistics are recovered to be normal.

The embodiments of the present invention are not limited to the above examples, and those skilled in the art should understand that any other modifications or equivalent substitutions without departing from the spirit and principle of the present invention should be considered as equivalent substitutions and all fall within the protection scope of the present invention.

Claims

1. The secondary radar with uninterrupted target track during radar channel switching comprises an antenna, a rotating hinge, a radio frequency switching unit and two channel devices, wherein each channel device comprises a transceiving multiplexing switch, a transmitter, a receiver and a response processor, and the response processor comprises a signal processor and a data processor; wherein each of the data processors is connected to two of the signal processors, respectively.