CN112731300A

CN112731300A - A time delay subassembly for airborne radar that controls mutually

Info

Publication number: CN112731300A
Application number: CN202011561892.4A
Authority: CN
Inventors: 杜小辉; 沈裕峰; 未晓东; 辛猛
Original assignee: Nanjing Jikai Microwave Technology Co ltd
Current assignee: Nanjing Jikai Microwave Technology Co ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-04-30

Abstract

The invention discloses a time delay assembly for an airborne phase-controlled radar, which comprises a transmitting channel part, a receiving channel part, a power supply/logic control part and a public time delay part, wherein the transmitting channel part is mainly used for amplifying the power of a radio frequency excitation signal and transmitting the amplified radio frequency excitation signal to a rear stage TR assembly; the microwave component based on the time delay technology is designed by combining the technical analysis of the microwave component and the theoretical basis of the real-time delay, and the time delay chip based on the GaAs MMIC technology is applied to the phased array radar firstly. The performance of the time delay device chip based on the GaAs MMIC technology is relatively stable, and a technical foundation is laid for the subsequent engineering application. Compared with the existing phased array antenna which changes the beam direction by means of a digital phase shifter, the antenna aperture transit time can be reduced by using a delayer at a microwave component, the instantaneous signal bandwidth of the phased array antenna is expanded, and the phased array antenna based on time delay is a key technology for realizing a multifunctional radar in the future.

Description

A time delay subassembly for airborne radar that controls mutually

Technical Field

The invention belongs to the technical field of airborne active phased array radar microwave correlation, and particularly relates to a time delay assembly for an airborne phased array radar.

Background

The broadband of the phased array radar becomes the current development trend, compared with the traditional narrow-band radar, the broadband radar has the advantages of high precision, strong anti-interference capability and the like, and the problem of beam space directional dispersion caused by the scanning angle can be caused due to the improvement of the bandwidth of the radar.

At present, wave velocity scanning of a phased array antenna mainly depends on a digital phase shifter with a simple structure and stable performance in a feed system, the phase shifter is controlled by a wave control system to change beam direction, and due to the influence of the transit time and the aperture effect, the instantaneous bandwidth of a signal is limited.

Therefore, in order to realize the wide-band and wide-angle scanning of the phased array radar, the time delay processor is used for replacing a phase shifter in the conventional phased array radar, and effective measures are taken.

Disclosure of Invention

The invention aims to provide a time delay assembly for an airborne phased radar, and aims to solve the problem that the wave speed scanning of the prior phased array antenna proposed in the background art mainly depends on a digital phase shifter with simple structure and stable performance in a feed system, and the instantaneous bandwidth of a signal is limited due to the influence of the transit time and the aperture effect of the phase shifter by controlling the phase shifter to change the beam direction through a wave control system.

In order to achieve the purpose, the invention provides the following technical scheme:

a time delay assembly for an airborne phase-controlled radar comprises a transmitting channel part, a receiving channel part, a power supply/logic control part and a public time delay part, wherein the transmitting channel part is mainly used for amplifying the power of a radio frequency excitation signal and transmitting the amplified radio frequency excitation signal to a rear stage TR assembly;

preferably, the receiving channel part mainly performs gain amplification on a signal of a system receiving channel;

preferably, the power supply/logic control part mainly provides power supply and logic control signals;

preferably, the public delay part comprises a 2-bit delayer chip, the delayer chip is a gallium arsenide monolithic microwave integrated circuit chip, the design difficulty and the development cost of the delay assembly can be greatly reduced, the assembly has higher delay precision, and the radar performance index is improved.

Preferably, the retarder chip is manufactured by adopting a GaAs E/D PHEMT process, the chip is grounded through a back through hole, the working frequency of the chip covers 8 GHz-12 GHz, the insertion loss is less than 7.5dB, the 2-digit controlled retarder chip is controlled by TTL level (0V/+5V), and the maximum delay amount is 315 ps.

Preferably, the time delay chip based on the GaAs MMIC technology is applied to the phased array radar, the performance of the time delay chip based on the GaAs MMIC technology is relatively stable, a technical foundation is laid for later engineering application, compared with the existing phased array antenna which changes the beam direction by means of a digital phase shifter, the transit time of the antenna aperture can be reduced by using the time delay device on a microwave component, the instantaneous signal bandwidth of the phased array antenna is expanded, and the phased array antenna based on the time delay is a key technology for realizing the multifunctional radar in the future.

Compared with the prior art, the invention provides a time delay assembly for an airborne phase control radar, which has the following beneficial effects:

the microwave component based on the time delay technology is designed by combining the technical analysis of the microwave component and the theoretical basis of the real-time delay, the time delay chip based on the GaAs MMIC technology is firstly applied to the phased array radar, the performance of the time delay chip based on the GaAs MMIC technology is relatively stable, the technical basis is laid for the later engineering application, compared with the existing phased array antenna which changes the beam direction by depending on a digital phase shifter, the transit time of the antenna aperture can be reduced by using the time delay on the microwave component, the instantaneous signal bandwidth of the phased array antenna is expanded, and the phased array antenna based on the time delay is the key technology for realizing the multifunctional radar in the future.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention without limiting the invention in which:

FIG. 1 is a schematic diagram of an antenna array plane used in an embodiment I of the airborne active phased array radar X-band driving delay assembly of the present invention;

FIG. 2 is a schematic diagram of a sub-array driving delay assembly used in the second embodiment of the airborne active phased array radar X-band driving delay assembly of the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution:

the receiving channel part is mainly used for carrying out gain amplification on signals of a system receiving channel;

the power supply/logic control part mainly provides power supply and logic control signals;

the public time delay part comprises a 2-bit time delay chip, the time delay chip is a gallium arsenide monolithic microwave integrated circuit chip, the design difficulty and the development cost of the time delay assembly can be greatly reduced, the assembly has higher time delay precision, and the performance index of the radar is improved.

The time delay chip is manufactured by adopting a GaAs E/D PHEMT process, the chip is grounded through a back through hole, the working frequency of the chip covers 8 GHz-12 GHz, the insertion loss is less than 7.5dB, the 2-digit controlled time delay chip is controlled by TTL level (0V/+5V), and the maximum time delay amount is 315 ps.

The time delay chip based on the GaAs MMIC technology is applied to the phased array radar, the performance of the time delay chip based on the GaAs MMIC technology is stable, a technical foundation is laid for later engineering application, compared with the existing phased array antenna which changes beam direction by means of a digital phase shifter, the transit time of an antenna aperture can be reduced by using the time delay on a microwave assembly, the instantaneous signal bandwidth of the phased array antenna is expanded, and the phased array antenna based on the time delay is a key technology for realizing the multifunctional radar in the future.

In the first embodiment shown in fig. 1, the position and function of the sub-array driving delay element in the antenna array surface, the received signal in the array antenna passes through the synthesis network after being amplified by the sub-array interior (T/R element), and then enters the sub-array driving delay element for gain compensation and delay, and a certain number of active sub-array received signals enter the receiver after being synthesized. The transmitting signals in the array antenna are distributed to each active subarray through a array surface network, then enter a driving delay assembly for signal amplification and delay, and are distributed to each T/R channel for amplification and then radiated by the antenna. The invention not only compensates the beam space pointing dispersion problem caused by wide-angle scanning of the broadband, but also acts on the telecommunication design of a receiving/transmitting link system.

In the second embodiment shown in fig. 2, the sub-array driving delay component integrates the functions of transmitting driving, receiving gain compensation and delay. In order to meet the requirements of receiving gain and transmitting output power, a two-stage amplifier is adopted in a transmitting link, and a two-stage low noise amplifier is also adopted in a receiving link. Meanwhile, when the internal electricity of the assembly is divided, the amplifiers are separated by adopting a delay circuit. On one hand, the physical distance between the amplifiers can be enlarged; on the other hand, the gain circuit can be prevented from being too concentrated, self-excitation is prevented, and the stability of the component is improved.

The microwave component based on the time delay technology is designed by combining the technical analysis of the microwave component and the theoretical basis of the real-time delay, the time delay chip based on the GaAs MMIC technology is applied to the phased array radar firstly, the performance of the time delay chip based on the GaAs MMIC technology is relatively stable, and the technical basis is laid for the subsequent engineering application. Compared with the existing phased array antenna which changes the beam direction by means of a digital phase shifter, the antenna aperture transit time can be reduced by using a delayer at a microwave component, the instantaneous signal bandwidth of the phased array antenna is expanded, and the phased array antenna based on time delay is a key technology for realizing a multifunctional radar in the future.

If delay compensation is performed on each antenna channel signal, the cost of the antenna array surface is increased to a large extent. Delay compensation is carried out by introducing a delayer to a sub-array stage of the phased array radar, and a common numerical control phase shifter is adopted in the sub-array. The X-waveband airborne active phased array radar subarray driving delay assembly designed by the invention is designed based on an MCM (Multi chip Module) technology, has the characteristics of miniaturization, high reliability and the like, and can reduce the aperture transit time of a phased array antenna, widen the instantaneous signal bandwidth of the phased array radar and realize the broadband wide-angle scanning of the phased array radar. The received signals in the array antenna pass through a synthesis network after being amplified by a sub-array interior (T/R component), then enter a sub-array drive delay component for gain compensation and delay, and a certain number of active sub-array received signals enter a receiver after being synthesized. The invention not only compensates the beam space pointing dispersion problem caused by broadband large-angle scanning, but also acts on the telecommunication design of a receiving/transmitting link system.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A delay assembly for an airborne phase-controlled radar comprising a transmit channel section, a receive channel section, a power/logic control section, and a common delay section, characterized by: the transmitting channel part is mainly used for amplifying the power of the radio frequency excitation signal and transmitting the amplified radio frequency excitation signal to a rear stage TR component;

2. A delay assembly for an airborne phased radar in accordance with claim 1, wherein: the time delay chip is manufactured by adopting a GaAs E/D PHEMT process, the chip is grounded through a back through hole, the working frequency of the chip covers 8 GHz-12 GHz, the insertion loss is less than 7.5dB, the 2-digit controlled time delay chip is controlled by a TTL level (0V/+5V), and the maximum time delay amount is 315 ps.

3. A delay assembly for an airborne phased radar in accordance with claim 1, wherein: the time delay chip based on the GaAs MMIC technology is applied to the phased array radar, the performance of the time delay chip based on the GaAs MMIC technology is stable, a technical foundation is laid for later engineering application, compared with the existing phased array antenna which changes beam direction by means of a digital phase shifter, the transit time of an antenna aperture can be reduced by using the time delay on a microwave component, the instantaneous signal bandwidth of the phased array antenna is expanded, and the phased array antenna based on the time delay is a key technology for realizing the multifunctional radar in the future.