CN213960051U

CN213960051U - Real-time high-isolation frequency spectrum monitoring front-end receiving device

Info

Publication number: CN213960051U
Application number: CN202022697222.7U
Authority: CN
Inventors: 沙文祥; 张明珠; 王雷; 高洪青
Original assignee: Nanjing Glarun Atten Technoogy Co ltd; CETC 14 Research Institute
Current assignee: Nanjing Glarun Atten Technoogy Co ltd; CETC 14 Research Institute
Priority date: 2020-11-19
Filing date: 2020-11-19
Publication date: 2021-08-13
Anticipated expiration: 2030-11-19

Abstract

The utility model discloses a frequency spectrum monitoring front end receiving arrangement of real-time high isolation, including high-speed high isolator group, high suppression filter group, increase the on-off control combination of isolation, increase the enlarged filtering combination of isolation, high-speed high isolator group will be input to the enlarged filtering combination of increasing the isolation by monitoring radio frequency signal, high-speed high isolator group will be input to high suppression filter group by the on-off control combination of monitoring radio frequency signal through increasing the isolation, the reverse signal input of high suppression filter group with filtering local oscillator and mixing output is to the on-off control combination of increasing the isolation. The utility model discloses real-time, high isolation, modularization, the reliability is high.

Description

Real-time high-isolation frequency spectrum monitoring front-end receiving device

Technical Field

The utility model relates to a frequency spectrum monitoring technology such as radar, communication, electron, especially a frequency spectrum monitoring front end receiving arrangement of real-time high isolation.

Background

With the development of communication technology, radar, electronic countermeasure and related technologies, higher and more comprehensive demands are made on spectrum monitoring equipment. The receiving front end of the frequency spectrum monitoring equipment is different from the front end requirement of a common receiver, and a plurality of monitoring channels need to be switched at high speed to ensure the real-time performance of the plurality of channels; high isolation is required between multiple channels to ensure that signal transmission between the multiple channels does not interfere with each other; and high isolation is required to be provided for the reverse interference signal, so that the local oscillation signal of the monitoring equipment can not reversely interfere the output signal of the monitored equipment through the transmission line. At present, a frequency spectrum monitoring front-end receiving module which is good in instantaneity, small in size, modularized and high in isolation is not released temporarily.

Disclosure of Invention

To the problem that exists among the prior art, the utility model provides a real-time, high isolation, modularization, the frequency spectrum monitoring front end receiving arrangement that the reliability is high.

The purpose of the utility model is realized through the following technical scheme.

The utility model provides a real-time high-isolation's spectrum monitoring front end receiving arrangement, includes high-speed high isolator group, high suppression filter bank, increases the on-off control combination of isolation, increases the enlarged filtering combination of isolation, high-speed high isolator group will be input to the enlarged filtering combination of increasing the isolation by monitoring radio frequency signal, high-speed high isolator group will be input to high suppression filter bank by the on-off control combination of increasing the isolation by monitoring radio frequency signal, high suppression filter bank will filter local oscillator and mixing output's reverse signal input to the on-off control combination of increasing the isolation.

High-speed high isolator group is used for switching 8 different input monitored radio frequency signal, high-speed high isolator group includes that 4 frequency response time are fast, and the high single-pole double-throw switch of isolation, the radio frequency signal that front end receiving arrangement received divide into A, B two sets ofly, because A, B two sets of signals can not simultaneous input signal, when surveying A group's signal 1, high-speed

high isolator group

2, 3, 4 can switch on the B passageway.

The high suppression filter bank is to under the condition that local oscillator and mixing output signal and the monitoring signal frequency channel of input do not coincide, to local oscillator and mixing output signal design filter bank, suppresses the reverse interference signal after local oscillator and the mixing, the high suppression filter bank includes 1 low pass filter and 3 band pass filter, the on-off control combination that increases the isolation includes a plurality of single-pole double-throw switches, the on-off control combination that increases the isolation is used for obtaining the high isolation between the input signal, single-pole double-throw switch is connected respectively at 1 low pass filter and 3 band pass filter both ends.

The amplification and filtering combination for increasing the isolation is used for increasing the isolation of reverse signals through amplification, attenuation and filtering aiming at the condition that the frequency bands of the local oscillator and the frequency mixing output signals coincide with the frequency bands of the input monitoring signals, and comprises a filter, an amplifier and an attenuator which are connected in sequence.

The reverse signal isolation of the amplifier is 20db, and the reverse signal isolation of the attenuator is 20 db.

Compared with the prior art, the utility model has the advantages of: the utility model is used for carry out the receiving front end of real-time supervision, detection to the radio frequency signal in radar, communication, the electronic equipment, increase the isolation of monitoring facilities frequency preselection, reduce the interference influence of monitoring facilities to the radar of normal work, communication, electronic equipment. The method has the characteristics of high isolation, modularization and high reliability.

Drawings

Fig. 1 is a schematic block diagram of the present invention.

Fig. 2 is a schematic block diagram of a high-speed high-isolation switch bank.

Fig. 3 is a schematic block diagram of a high rejection filter bank and switching control combination for increasing isolation.

Fig. 4 is a schematic block diagram of an amplification filter combination for increasing isolation.

Detailed Description

The invention is described in detail below with reference to the drawings and specific examples.

As shown in fig. 1, the high-isolation spectrum monitoring front-end receiving module mainly comprises a high-speed switch, various filters with different wave bands, and an amplifier. Including high-speed high isolator group, high suppression filter bank, increase the on-off control combination of isolation, increase the amplification filtering combination of isolation, high-speed high isolator group will be monitored radio frequency signal input to the amplification filtering combination that increases the isolation, high-speed high isolator group will be monitored radio frequency signal and input to high suppression filter bank through the on-off control combination that increases the isolation, high suppression filter bank will filter the reverse signal input of local oscillator and mixing output to the on-off control combination that increases the isolation, and the frequency preselection of input signal has been decided to front end receiving module circuit, and the main frequency response time that influences, the isolation between the input signal to indexes such as the degree of suppression of reverse signal at the input. Therefore, the circuit with low insertion loss, quick response time, good channel filtering and high channel isolation is designed, and meanwhile reverse signal isolation is added to prevent the signals from being reversely connected back to the tested equipment in series.

As shown in fig. 2, the high-speed high-isolation switch group is used for switching 8 paths of monitored radio frequency signals with different inputs, and includes 4 groups of single-pole double-throw switches with fast frequency response time and high isolation. The radio frequency signals received by the front end receiving module are divided into A, B groups. Since A, B two sets of signals will not input signals at the same time, when testing the a set of signals 1, the

switches

2, 3, 4 of the front end receiving module will switch on the B channel. By analogy, the switch control combination of the input end is designed, so that high isolation between input signals can be obtained, and the purity of rear-end processing signals is guaranteed.

As shown in fig. 3, the high-rejection filter bank circuit mainly consists of a high-speed switch and various filters with different wave bands. The high-suppression filter bank is designed aiming at the local oscillator and the frequency mixing output signal under the condition that the frequency bands of the local oscillator and the frequency mixing output signal are not overlapped with the frequency bands of the input monitoring signal, low insertion loss and high-suppression filters are designed, and the input signal is input into filters of different frequency bands in a segmented mode through switching, so that high forward signal suppression and high reverse signal suppression are obtained. The high-rejection filter bank comprises 1 low-pass filter and 3 band-pass filters, the switch control combination for increasing the isolation degree comprises a plurality of single-pole double-throw switches, the switch control combination for increasing the isolation degree is used for obtaining the high isolation degree between input signals, and two ends of the 1 low-pass filter and two ends of the 3 band-pass filters are respectively connected with the single-pole double-throw switches.

As shown in fig. 4, the amplification and filtering combination for increasing the isolation includes a filter, an amplifier, and an attenuator, and the filter, the amplifier, and the attenuator are connected in sequence. The reverse signal isolation of the amplifier is 20db, and the reverse signal isolation of the attenuator is 20 db. For the channel of which the frequency band of the local oscillator and the frequency mixing output signal is coincident with the frequency band of the input monitoring signal, the stray of the input signal is firstly inhibited through a filter. Because the frequency bands are overlapped, the reverse signals cannot be filtered by means of segmented filtering, and therefore the isolation of the reverse signals is increased by adopting the design of amplification and attenuation.

The receiving front-end module of the frequency spectrum monitoring equipment is provided with a high-speed high-isolation switch group, a high-suppression filter group, a switch control combination for increasing isolation and an amplification filtering combination for increasing isolation. The frequency preselection front-end receiver is mainly used for the receiving front end for monitoring and detecting radio frequency signals in radar, communication and electronic equipment, increasing the isolation of frequency preselection of the monitoring equipment and reducing the interference influence of the monitoring equipment on the radar, the communication and the electronic equipment which normally work.

The above description is only a preferred embodiment of the present invention, and is not limited to the present invention, and various modifications and changes can be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The utility model provides a frequency spectrum monitoring front end receiving arrangement of real-time high isolation, its characterized in that includes high-speed high isolator group, high suppression filter bank, increases the on-off control combination of isolation, increases the enlarged filtering combination of isolation, high-speed high isolator group will be input to the enlarged filtering combination that increases the isolation by monitoring radio frequency signal, high-speed high isolator group will be input to high suppression filter bank by the on-off control combination that increases the isolation by monitoring radio frequency signal, high suppression filter bank will filter local oscillator and mixing output's reverse signal input to the on-off control combination that increases the isolation.

2. The real-time high-isolation spectrum monitoring front-end receiving device according to claim 1, wherein the high-speed high-isolation switch group is used for switching 8 different input monitored radio frequency signals, the high-speed high-isolation switch group comprises 4 groups of single-pole double-throw switches with fast frequency response time and high isolation, the radio frequency signals received by the front-end receiving device are divided into A, B two groups, and since A, B two groups of signals do not input signals simultaneously, when detecting the a group signal 1, the high-speed high-isolation switch groups 2, 3, 4 are switched on the B channel.

3. The real-time high-isolation spectrum monitoring front-end receiver according to claim 1, wherein the high-rejection filter bank is designed for the local and mixed output signals and suppresses the reverse interference signals after the local and mixed output signals, when the local and mixed output signals are not overlapped with the frequency band of the input monitoring signal, the high-rejection filter bank includes 1 low-pass filter and 3 band-pass filters, the isolation-increasing switch control combination includes a plurality of single-pole double-throw switches, the isolation-increasing switch control combination is used to obtain high isolation between the input signals, and two ends of the 1 low-pass filter and the 3 band-pass filters are respectively connected to the single-pole double-throw switches.

4. The real-time high-isolation spectrum monitoring front-end receiving device according to claim 1, wherein the amplification and filtering combination for increasing isolation is used to increase isolation of a reverse signal by amplifying, attenuating, and filtering for a case that a local oscillator and mixing output signal coincides with a frequency band of an input monitoring signal, and the amplification and filtering combination for increasing isolation includes a filter, an amplifier, and an attenuator, and the filter, the amplifier, and the attenuator are connected in sequence.

5. The real-time high-isolation spectrum monitoring front-end receiver according to claim 4, wherein the amplifier reverse signal isolation is 20db, and the attenuator reverse signal isolation is 20 db.