Ultra-wideband radar signal reconnaissance and interference system

Abstract

The utility model discloses an ultra-wideband radar signal reconnaissance and interference system, which comprises a receiving antenna, a transmitting antenna, a radio frequency receiver, a radio frequency transmitter and a signal processor, the signal processor is respectively connected with the radio frequency receiver and the radio frequency transmitter, the receiving end of the radio frequency receiver is connected with the receiving antenna, and the output end of the radio frequency transmitter is connected with the transmitting antenna through the microwave power amplifier. The radio frequency receiver comprises a radio frequency front-end unit, a frequency conversion unit and an intermediate frequency unit which are arranged in sequence, and the radio frequency front-end unit is used for receiving a broadband signal of a target radar, performing filtering, amplification and power conditioning on the broadband signal and sending the broadband signal to the frequency conversion unit; the frequency conversion unit is used for performing secondary superheterodyne frequency conversion on the signal to an intermediate frequency signal; the intermediate frequency unit is used for amplifying and filtering the intermediate frequency signal and then outputting to the signal processor. Due to the characteristic of small link noise coefficient of the radio frequency transceiver, the system has the advantage of ultrahigh sensitivity, can adapt to various signal radar systems, and has better practicability.

Description

Technical Field

[0001] This utility model belongs to the technical field of radar signal processing, specifically relating to an ultra-wideband radar signal detection and jamming system. Background Technology

[0002] With the development of science and technology, the role of radar has become increasingly prominent, allowing enemy radar to accurately and in real-time acquire information about friendly targets in a scene. To prevent radar from detecting friendly targets, equipment capable of jamming radar is needed, preventing it from receiving real target information or allowing it to receive false target information. Given the increasingly complex electromagnetic signal environment and the threats posed by various new radar systems, it is not only necessary to accelerate the upgrading of existing radar jamming equipment using contemporary high technology, but also to target emerging new technologies and systems, explore new radar jamming technologies, and accelerate the development and deployment of more effective radar jamming equipment to improve the overall effectiveness of radar countermeasures. For example, in modern application scenarios, an aircraft may be tracked by dozens of radars; therefore, it is necessary to counter the threat of these radars by rapidly detecting and jamming the target radar. Utility Model Content

[0003] The purpose of this invention is to provide an ultra-wideband radar signal reconnaissance and jamming system, aimed at detecting and jamming target radars. The ultra-wideband range in this invention is 2~18GHz.

[0004] This utility model is mainly achieved through the following technical solutions:

[0005] An ultra-wideband radar signal detection and jamming system includes a receiving antenna, a transmitting antenna, a radio frequency receiver, a radio frequency transmitter, and a signal processor; the signal processor is connected to the radio frequency receiver and the radio frequency transmitter via an ADC and a DAC, respectively; the receiving end of the radio frequency receiver is connected to the receiving antenna; and the output end of the radio frequency transmitter is connected to the transmitting antenna via a microwave power amplifier.

[0006] The receiving antenna is used to receive target radar signals and distribute them to an RF receiver; the RF receiver is used to frequency-convert, amplify, filter, and down-convert the target radar signals to a low-intermediate frequency (IF) signal, and then send it to a signal processor; the signal processor is used to generate an interference signal based on the IF signal and send it to an RF transmitter; the RF transmitter is used to frequency-convert, amplify, and up-convert the interference signal to a microwave power amplifier; the microwave power amplifier is used to amplify the signal and send it to the transmitting antenna.

[0007] The radio frequency receiver includes a radio frequency front-end unit, a frequency conversion unit, and an intermediate frequency unit arranged sequentially from front to back. The radio frequency front-end unit is used to receive the broadband signal of the target radar, filter, amplify, and power condition it, and then send it to the frequency conversion unit. The frequency conversion unit is used to perform a second superheterodyne frequency conversion on the signal to an intermediate frequency signal. The intermediate frequency unit is used to amplify and filter the intermediate frequency signal and then output it to the signal processor.

[0008] To better realize this utility model, the radio frequency front-end unit further includes a limiter, an amplifier, a filter, a programmable attenuator, and an amplifier arranged sequentially from front to back.

[0009] To better realize this utility model, the frequency conversion unit further includes a mixer, a filter, an amplifier and a mixer arranged sequentially from front to back.

[0010] To better realize this utility model, the intermediate frequency unit further includes a filter, an amplifier, a programmable attenuator, and a filter arranged sequentially from front to back.

[0011] To better realize this utility model, the signal processor further includes an FPGA and a DSP module. The FPGA is connected to the radio frequency receiver and the radio frequency transmitter through ADC and DAC respectively, and the FPGA is connected to the host computer through the DSP module.

[0012] To better realize this utility model, the FPGA further includes a channelization module, a direction-finding module, and a PDW generation module. The channelization module is connected to both the direction-finding module and the PDW generation module, and the direction-finding module and the PDW generation module are connected to the DSP module. The channelization module is used to channelize the data signal and generate I and Q data, and sends the I and Q data to the direction-finding module and the PDW generation module, respectively. The direction-finding module and the PDW generation module are used for azimuth measurement and PDW generation, respectively, and send them to the DSP module. The DSP module is used for signal sorting and interference control issued to the FPGA.

[0013] To better realize this utility model, the FPGA further includes an interference module. The radio frequency receiver is connected to the interference module and the channelization module through an ADC. The interference module is connected to the DSP module and to the radio frequency transmitter through a DAC for outputting interference signals.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention features an ultra-high operating bandwidth of 2-18 GHz and supports direction finding, reconnaissance, and jamming modes. Furthermore, the RF receiver employs double superheterodyne technology to down-convert the RF signal received by the antenna to an intermediate frequency (IF) for acquisition by the signal processor's ADC, resulting in a low noise figure. The RF transmitter's design concept is essentially the same as the RF receiver, but the process is reversed. When the system performs direction finding, the links of all RF receivers are perfectly aligned, reducing inter-channel phase errors. The low link noise figure of the RF transceiver gives the device an advantage in ultra-high sensitivity. This invention is adaptable to various radar systems, such as monopulse radar, linear frequency modulated radar, frequency agile radar, and Doppler radar. This invention can utilize micro-packaging technology to achieve miniaturization, making it highly practical. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the miniaturized ultra-wideband radar signal detection and jamming system of this utility model;

[0017] Figure 2 This is a schematic diagram of the receiving antenna array in Example 2;

[0018] Figure 3 This is a schematic diagram of the radio frequency receiver in Example 2;

[0019] Figure 4 This is a block diagram of the signal processor in Example 2. Detailed Implementation

[0020] Example 1:

[0021] A system for detecting and jamming ultra-wideband radar signals, such as Figure 1 As shown, it includes: an antenna array, a radio frequency transceiver, a signal processor, and a microwave power amplifier; the antenna array includes a receiving antenna and a transmitting antenna, the radio frequency transceiver includes a radio frequency receiver and a radio frequency transmitter, and the signal processor includes an FPGA, an ADC, a DAC, and a DSP module.

[0022] The receiving antenna and transmitting antenna are respectively used to receive the target radar's transmitted signal and transmit jamming signals to the target radar. Preferably, as shown in the image... Figure 1 and Figure 2As shown, the antenna array comprises N (N≥1) receiving antennas and N (N≥1) transmitting antennas. The N (N≥1) receiving antennas enable the target radar to perform direction finding and reconnaissance; the number of receiving antennas can be selected according to actual direction finding requirements. Similarly, the number of N (N≥1) transmitting antennas is selected based on interference requirements. Correspondingly, the radio frequency transceiver comprises N (N≥1) radio frequency receivers (the number of radio frequency receivers is synchronized with the number of receiving antennas) and N (N≥1) radio frequency transmitters (the number of transmitters is synchronized with the number of transmitting antennas).

[0023] The radio frequency (RF) receiver is used to down-convert the target radar's transmitted signal to obtain the intermediate frequency (IF) signal required by the signal processor. The RF transmitter up-converts the IF interference signal generated by the signal processor to obtain the same carrier frequency interference signal from the target radar. Preferably, the RF receiver uses double superheterodyne technology to down-convert the RF signal received by the antenna to IF for acquisition by the signal processor's ADC, resulting in a low noise figure. When the system requires direction finding, the links of all RF receivers must be completely consistent to reduce inter-channel phase errors. Preferably, the RF transmitter also uses double superheterodyne technology to up-convert the IF signal generated by the signal processor to RF. A common local oscillator design is required between the RF receiver and RF transmitter links.

[0024] The microwave power amplifier is used to further amplify the interference signal sent by the radio frequency transmitter to ensure long-distance interference effect. At the same time, the output power of the microwave power amplifier is related to the maximum simulating RCS.

[0025] The aforementioned signal processor is used to analyze target radar signals and generate jamming strategies. It performs frequency and direction finding of the target radar, as well as signal reconnaissance with an instantaneous bandwidth of 2GHz; completes PDW-based signal sorting, providing a foundation for subsequent signal jamming and direction finding; executes various jamming patterns according to master control commands; and handles interface control between the signal processing board and the microwave and host computer.

[0026] The ADC is used to acquire the intermediate frequency signal from the RF transceiver and convert the RF signal into a digital signal through analog-to-digital conversion. The DAC is used to convert the digital signal generated by the FPGA into an analog signal.

[0027] The FPGA is used for signal processing and jamming generation, enabling the detection and jamming of target signals. The DSP module is used for controlling the various functional modules and processing the radar target sorting algorithm.

[0028] In use, the receiving antenna of this invention receives the target radar signal and distributes it to the radio frequency (RF) receiver. The RF receiver then performs frequency conversion, amplification, and filtering to reduce the frequency to a low-to-intermediate frequency before sending it to the signal processor for target radar feature extraction and sorting. Subsequently, according to the host computer's control requirements, the target radar is jammed. The signal processor generates a corresponding jamming signal and sends it to the RF transmitter. After frequency conversion and amplification by the RF transmitter, the signal is sent to a microwave power amplifier for further power amplification, and then radiated through the transmitting antenna of the antenna array to achieve reconnaissance and jamming of the target radar.

[0029] Example 2:

[0030] A system for detecting and jamming ultra-wideband radar signals, such as Figure 1 As shown, the device includes an antenna array, an RF transceiver, a signal processor, a microwave power amplifier, and a power supply section. The power supply section provides power for the normal operation of the RF transceiver, signal processor, and microwave power amplifier. The antenna array includes a receiving antenna and a transmitting antenna. The RF transceiver includes an RF receiver and an RF transmitter. The signal processor includes an FPGA, an ADC, a DAC, and a DSP module.

[0031] like Figure 2 As shown, this embodiment uses a one-dimensional interferometer (virtual baseline) for direction finding to achieve radar target azimuth reconnaissance, where θ is the radar signal direction; d1 is the spacing between adjacent antennas, d2 is the length of the three antennas, and d3 is the length of the four antennas. The virtual baseline method uses the phase difference between two baselines and subtracts them to obtain a virtual short baseline equivalent to this phase difference. The equivalent size of this short baseline can be less than half the wavelength of the highest frequency broadband signal, thus expanding the unambiguous viewing angle. The standard deviation of the phase difference obtained from the virtual baseline is equal to the standard deviation of the phase measurement error of the real baseline. Theoretically, multiple levels of virtual baselines can be constructed to obtain even shorter baselines for deblurring.

[0032] like Figure 3 As shown, the RF receiver includes an RF front-end unit, a frequency conversion unit, and an intermediate frequency (IF) unit. The RF front-end unit includes, from front to back, a limiter, an amplifier, a filter, a programmable attenuator, and another amplifier; the frequency conversion unit includes, from front to back, a mixer, a filter, an amplifier, and another mixer; the IF unit includes, from front to back, a filter, an amplifier, a programmable attenuator, and another filter. Furthermore, the design concept of the RF transmitter is basically the same as that of the RF receiver, only the reverse process, which will be elaborated upon here.

[0033] The broadband signal input to the RF receiver is filtered, amplified, and power conditioned by the RF front-end unit before being sent to the frequency conversion unit for secondary superheterodyne conversion. The frequency conversion unit first upconverts the signal to the Ku band via a high local oscillator, and then downconverts it to the intermediate frequency (IF) via a secondary conversion. This secondary superheterodyne conversion scheme effectively suppresses image frequencies and some intermodulation. The signal converted to the IF is then amplified and filtered by the IF unit before being output to the signal processor for ADC sampling.

[0034] like Figure 4 As shown, the FPGA includes an interference module, a channelization module, a direction-finding module, and a PDW generation module. These modules are all existing technologies, such as CN111308430B, CN114488034A, and CN114879130A, and will not be described further. The channelization module is connected to both the direction-finding module and the PDW generation module, which are in turn connected to the DSP module. The channelization module performs channelization processing on the data signal and generates I and Q data, which are then sent to the direction-finding module and the PDW generation module, respectively. The direction-finding module and the PDW generation module are used for azimuth measurement and PDW generation, respectively, and are sent to the DSP module. The DSP module performs signal sorting and issues interference control to the FPGA. The RF receiver is connected to both the interference module and the channelization module via an ADC. The interference module is connected to the DSP module and also to the RF transmitter via a DAC to output interference signals.

[0035] After the ADC in the signal processor acquires the signal, it converts the intermediate frequency signal into a baseband signal and uses a local oscillator sequence for mixing to reduce computational complexity. Decimation causes signal spectrum shifting and broadening; to prevent aliasing after shifting and broadening, filtering is also required. The FPGA performs channelization processing on the data signal, and the generated I and Q data are sent to the direction-finding module and PDW generation module respectively for azimuth angle measurement and PDW generation. The angle and PDW are transmitted to the DSP module via EMIF for signal sorting and other functions. Subsequently, the DSP module issues corresponding interference control to the FPGA based on the interference mode confirmed by the host computer. The FPGA's interference module responds to this, finally generating an interference signal output.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A system for detecting and jamming ultra-wideband radar signals, characterized in that, It includes a receiving antenna, a transmitting antenna, a radio frequency receiver, a radio frequency transmitter, and a signal processor; the signal processor is connected to the radio frequency receiver and the radio frequency transmitter through an ADC and a DAC, respectively; the receiving end of the radio frequency receiver is connected to the receiving antenna; and the output end of the radio frequency transmitter is connected to the transmitting antenna through a microwave power amplifier. The receiving antenna is used to receive target radar signals and distribute them to the radio frequency receiver; The radio frequency receiver is used to convert, amplify, filter, and downconvert the target radar signal to a low-intermediate frequency signal, and then send it to the signal processor; the signal processor is used to generate an interference signal based on the low-intermediate frequency signal and send it to the radio frequency transmitter; the radio frequency transmitter is used to convert, amplify, and upconvert the interference signal to a microwave power amplifier. The microwave power amplifier is used to amplify the signal and send it to the transmitting antenna; The radio frequency receiver includes a radio frequency front-end unit, a frequency conversion unit, and an intermediate frequency unit arranged sequentially from front to back. The radio frequency front-end unit is used to receive the broadband signal of the target radar, filter, amplify, and power condition it, and then send it to the frequency conversion unit. The frequency conversion unit is used to perform a second superheterodyne frequency conversion on the signal to an intermediate frequency signal. The intermediate frequency unit is used to amplify and filter the intermediate frequency signal and then output it to the signal processor.

2. The ultra-wideband radar signal detection and jamming system according to claim 1, characterized in that, The radio frequency front-end unit includes a limiter, an amplifier, a filter, a programmable attenuator, and an amplifier arranged sequentially from front to back.

3. The ultra-wideband radar signal detection and jamming system according to claim 1, characterized in that, The frequency conversion unit includes a mixer, a filter, an amplifier, and another mixer arranged sequentially from front to back.

4. The ultra-wideband radar signal detection and jamming system according to claim 1, characterized in that, The intermediate frequency unit includes a filter, an amplifier, a programmable attenuator, and a filter arranged sequentially from front to back.

5. A detection and jamming system for ultra-wideband radar signals according to any one of claims 1-4, characterized in that, The signal processor includes an FPGA and a DSP module. The FPGA is connected to the radio frequency receiver and the radio frequency transmitter through ADC and DAC, respectively, and the FPGA is connected to the host computer through the DSP module.

6. The ultra-wideband radar signal detection and jamming system according to claim 5, characterized in that, The FPGA includes a channelization module, a direction-finding module, and a PDW generation module. The channelization module is connected to both the direction-finding module and the PDW generation module, and both the direction-finding module and the PDW generation module are connected to a DSP module. The channelization module performs channelization processing on the data signal and generates I and Q data, which are then sent to the direction-finding module and the PDW generation module, respectively. The direction-finding module and the PDW generation module are used for azimuth measurement and PDW generation, respectively, and are sent to the DSP module. The DSP module is used for signal sorting and interference control issued to the FPGA.

7. A detection and jamming system for ultra-wideband radar signals according to claim 6, characterized in that, The FPGA also includes an interference module. The radio frequency receiver is connected to the interference module and the channelization module via an ADC. The interference module is connected to the DSP module and to the radio frequency transmitter via a DAC for outputting interference signals.

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