An ultra-wideband radar signal reconnaissance system with spectrum monitoring

Abstract

The present invention discloses an ultra-wideband radar signal reconnaissance system with spectrum monitoring, comprising a main control computer, an intermediate frequency processing unit, an antenna, a radio frequency unit, and a power supply. Radar signals in space are received by the antenna and sent to the radio frequency unit. A multiplexer in the radio frequency unit down-converts the radar signal according to the operating mode and then sends it to the intermediate frequency processing unit. The intermediate frequency processing unit completes spectrum processing, intermediate frequency acquisition, channel calibration, and radar signal measurement. Finally, these types of data are transmitted to the main control computer via a 10 Gigabit network interface. The main control computer performs panoramic spectrum display, intermediate frequency data storage, and radar signal parameter display. The present invention integrates the acquisition function, spectrum monitoring function, and radar signal detection function into a single system, sharing a set of software and hardware, and is highly portable. This system not only meets functional requirements, but also reduces software and hardware development and maintenance costs, and improves hardware utilization.

Description

Technical Field

[0001] The present invention belongs to the technical field of radar communication, and in particular relates to an ultra-wideband radar signal reconnaissance system with spectrum monitoring. Background Art

[0002] Electronic countermeasures not only need to obtain technical parameters such as the radar emitter's frequency, azimuth angle of arrival, pulse period, and modulation type, but also need to monitor the electromagnetic spectrum and collect and store information on frequency bands of interest for offline analysis, thereby obtaining comprehensive information about the radar source. Traditional acquisition and storage devices, spectrum monitoring equipment, and radar signal reconnaissance equipment are all independent of each other. Currently, there is no single device that combines the functions of radar signal reception, spectrum monitoring, and acquisition and storage with a single hardware package. Summary of the Invention

[0003] The purpose of the present invention is to provide an ultra-wideband radar signal reconnaissance system with spectrum monitoring, which mainly solves the problems of large size, heavy weight and high power consumption of existing reconnaissance equipment.

[0004] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] An ultra-wideband radar signal reconnaissance system with spectrum monitoring includes a main control computer, an intermediate frequency processing unit, an antenna, a radio frequency unit and a power supply;

[0006] The main control computer is used to complete parameter configuration and radar signal parameter display; the configuration method of the main control computer is as follows:

[0007] a. Configure the working mode switching module to switch and display the calibration mode, self-test mode, reconnaissance mode and acquisition mode;

[0008] b. Configuration parameter module, used to set threshold value, self-test frequency, and self-test pulse width parameters;

[0009] c. Configure the data statistics module to display the radar signal parameter-time curve;

[0010] d. Configure the status monitoring module to monitor the operating status of the functional modules;

[0011] e. Configure the spectrum display module to view the spectrum graph and waterfall graph;

[0012] f. Configure a signal acquisition module to collect radar signals;

[0013] g. Configure a radar signal parameter display module to display the parameters of the collected radar signal;

[0014] h. Configure the radiation source library to import and export radar radiation sources;

[0015] The intermediate frequency processing unit is used to realize real-time spectrum processing of sampled data, intermediate frequency acquisition, system calibration, radio frequency control and radar signal parameter measurement;

[0016] The antenna is used to receive airborne radar signals in the frequency range of 2 to 18 GHz;

[0017] The radio frequency unit is used to implement up-conversion and down-conversion processing of the signal;

[0018] The power supply is used to provide +24V DC power to the radio frequency unit and the intermediate frequency processing unit.

[0019] Furthermore, in the present invention, the intermediate frequency processing unit includes an FPGA module, a DAC module, an ADC module, a GPIO module, and an optical port, all of which are connected to the FPGA module; wherein the optical port is connected to a main control computer via a 10 Gigabit network, and the DAC module, ADC module, and GPIO module are all connected to the intermediate frequency processing unit;

[0020] Real-time spectrum processing samples data through the ADC module and transmits the sampled data to the main control computer, where spectrum splicing is completed and a panoramic spectrum graph is finally displayed.

[0021] The IF acquisition process down-converts and decimates the ADC data to 300 MHz. Four half-band filters are then cascaded to create IF signals with bandwidths of 120 MHz, 60 MHz, 30 MHz, and 15 MHz. These signals are then transmitted to the host computer via a 10 Gigabit Ethernet network for storage.

[0022] System calibration is performed by calculating the calibration coefficients every 2 MHz. The obtained calibration coefficients are finally transmitted to the main control computer via the 10 Gigabit network for storage and then sent to the FPGA when needed.

[0023] The RF control function uses the RF control module to control the frequency band according to the established polling table, completing the frequency band coverage of 2~18GHz;

[0024] Radar signal parameter measurement uses channelization technology and interferometer virtual baseline method to obtain the pulse description word PDW before sorting: center frequency, bandwidth, pulse width, pulse repetition period, pulse amplitude, azimuth arrival angle; the pulse description word PDW is transmitted to the main control computer through the 10 Gigabit network, and the radar signal is sorted and the radiation source description word EDW is displayed on the main control computer.

[0025] Furthermore, in the present invention, the data display module displays radar signal parameter-time curve graphs including "PRI cycle-time", "center frequency-time", "bandwidth-time", "pulse width-time", and "pulse amplitude-time" graphs.

[0026] Furthermore, in the present invention, the functional modules monitored by the status monitoring module include a radio frequency unit, an FPGA module and a 10 Gigabit network.

[0027] Furthermore, in the present invention, the data collected by the signal acquisition module are pulse description words PDW, radiation source description words EDW, wideband FFT and intermediate frequency.

[0028] Furthermore, in the present invention, the parameters displayed by the radar signal parameter display module are the pulse description word PDW before sorting and the radiation source description word EDW after sorting.

[0029] Furthermore, in the present invention, the radio frequency unit includes a selector, a down converter and an up converter; wherein,

[0030] In the calibration mode or self-test mode, the up-conversion module converts the calibration or self-test signal generated by the intermediate frequency processing unit to a frequency range of 2 to 18 GHz.

[0031] In the reconnaissance mode, the radar signal radiated from the antenna is digitally down-converted to an intermediate frequency signal with a center frequency of 1.8 GHz and an instantaneous bandwidth of 1 GHz, and then the intermediate frequency signal is input into the intermediate frequency processing unit.

[0032] Furthermore, in the present invention, the workflow of the reconnaissance system is as follows:

[0033] 1) After turning on the machine, perform calibration first;

[0034] 2) After calibration, perform a self-test and observe the following status information, spectrum diagram, and measured radar parameters;

[0035] a) FPGA module temperature, ADC module clock lock status, DAC module clock lock status, and 10G Ethernet interface status;

[0036] b) Whether the spectrum of the self-test signal is consistent with the set frequency;

[0037] c) Whether the measured radar parameters are consistent with the set parameters;

[0038] 3) If the self-test is normal, you can proceed to the next step. Otherwise, troubleshoot according to the prompts.

[0039] 4) The device enters reconnaissance mode and starts after setting the threshold;

[0040] 5) The intermediate frequency processing unit performs radar signal detection and spectrum processing, and uploads the pulse description word PDW to the main control computer;

[0041] 6) After sorting, the main control computer displays the parameters and spectrum of the received radar signals.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] (1) The present invention integrates the acquisition function, spectrum monitoring function and radar signal detection function, sharing a set of software and hardware, which is highly portable. It not only meets the functional requirements, but also reduces the software and hardware development cost and maintenance cost, and improves the utilization rate of the hardware.

[0044] (2) This invention uses a frequency polling table to configure the radio frequency. You only need to configure the center frequency local oscillator to be used in the table. The current frequency range is 2 to 18 GHz. If the frequency range is to be increased to above 18 GHz, no software redevelopment is required; you only need to configure a new frequency polling table.

[0045] (3) The device of the present invention is streamlined: Since the three functions share a set of hardware, the weight, volume and power consumption of the device are greatly improved compared with the three traditional independent devices. In particular, drones have strict requirements on the weight and power consumption of the device.

[0046] (4) The present invention is rich in functions: since it has the functions of spectrum monitoring and radar signal detection, when a radar signal is detected, the spectrum characteristics of the radar signal can be intuitively seen on the panoramic spectrum. In addition, the radar signal or non-radar signal of interest to the user can be collected and stored for offline analysis.

[0047] (5) The present invention has superior performance: the device has a wide detection frequency range, large instantaneous bandwidth, and can simultaneously detect and process multiple radars in the same beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 The following is a block diagram of the composition principle of the radar signal reconnaissance system of the present invention.

[0049] Figure 2 It is a schematic diagram of the overall structure of the radar signal reconnaissance system of the present invention.

[0050] Figure 3 This is a principle block diagram of the intermediate frequency processing unit in the present invention.

[0051] Figure 4 The following is a flowchart of the radar signal reconnaissance system in the present invention. DETAILED DESCRIPTION

[0052] The present invention will be further described below with reference to the accompanying drawings and examples. The embodiments of the present invention include but are not limited to the following examples.

[0053] like Figure 1 As shown in FIG, the present invention discloses an ultra-wideband radar signal reconnaissance system with spectrum monitoring, including a main control computer, an intermediate frequency processing unit, an antenna, a radio frequency unit and a power supply. Figure 2 As shown in the figure, radar signals from space are received by the antenna and fed into the RF unit. The multiplexer in the RF unit downconverts the radar signals according to the operating mode and then feeds them into the IF processing unit. This unit performs spectrum processing, IF acquisition, channel calibration, and radar signal measurement. Finally, this data is transmitted to the host computer via a 10 Gigabit Ethernet interface, where a panoramic spectrum display, IF data storage, and radar signal parameter display are performed. The antenna receives airborne radar signals in the 2-18 GHz frequency range; the RF unit performs signal upconversion and downconversion; and the power supply provides +24V DC power to the RF unit and IF processing unit.

[0054] In this embodiment, the main control computer mainly completes the configuration of parameters, the display of the full spectrum, the display of the PDW (pulse descriptor) before sorting and the EDW (radiation source descriptor) after sorting, the acquisition and control of the intermediate frequency data, and the display of the equipment status. The configuration method of the main control computer is as follows:

[0055] a. Configure the working mode switching module to switch and display the calibration mode, self-test mode, reconnaissance mode and acquisition mode;

[0056] b. Configuration parameter module, used to set threshold value, self-test frequency, and self-test pulse width parameters;

[0057] c. Configure the data statistics module to display radar signal parameter-time curves, including "PRI cycle-time", "center frequency-time", "bandwidth-time", "pulse width-time", and "pulse amplitude-time" graphs.

[0058] d. Configure the status monitoring module to monitor the operating status of functional modules, including the radio frequency unit, FPGA module, and 10 Gigabit network.

[0059] e. Configure the spectrum display module for viewing spectrum graphs and waterfall charts. You can set the frequency resolution and detection style, zoom, and cursor display. The waterfall chart can display the relationship between frequency and amplitude in real time.

[0060] f. Configure the signal acquisition module to collect radar signals, including PDW, EDW, wideband FFT and intermediate frequency data, and support the display of acquisition status;

[0061] g. Configure the radar signal parameter display module to display the parameters of the collected radar signal; display the PDW before sorting and the EDW after sorting.

[0062] h. Configure the radiation source library to import and export radar radiation sources;

[0063] The intermediate frequency processing unit is developed based on Xilinx's RFSOC chip. The principle block diagram is as follows: Figure 3 As shown in the figure, it mainly consists of five parts, including an FPGA module, a DAC module, an ADC module, a GPIO module and an optical port connected to the FPGA module; wherein the optical port is connected to the main control computer through a 10 Gigabit network, and the DAC module, ADC module and GPIO module are all connected to the intermediate frequency processing unit; it is used to realize real-time spectrum processing of sampled data, intermediate frequency acquisition, system calibration, RF control and radar signal parameter measurement.

[0064] The red dashed line represents the spectrum graph function. The ADC module samples the data and transmits it to the host computer, where the spectrum is stitched together to display the full spectrum graph.

[0065] The green dashed line represents the IF acquisition function. The ADC data is first down-converted and decimated by 8, reducing the sampling rate to 300 MHz. Four half-band filters are then cascaded to produce IF signals with bandwidths of 120 MHz, 60 MHz, 30 MHz, and 15 MHz. These signals are then transmitted via a 10 Gigabit Ethernet port to the host computer for storage.

[0066] The blue dashed line represents the entire system calibration function, calculating calibration coefficients every 2 MHz. These coefficients are then transmitted via the 10 Gigabit Ethernet port to the host computer for storage and then sent to the FPGA for use.

[0067] The RF control module is within the yellow dotted line, which controls the frequency band according to the specified polling table to achieve frequency coverage from 2 to 18 GHz.

[0068] The brown dashed line represents the measured radar signal parameters. Channelization technology and the interferometer virtual baseline method are used to obtain the PDW: center frequency, bandwidth, pulse width, pulse repetition period, pulse amplitude, and azimuth angle of arrival. The PDW is transmitted to a host computer via a 10 Gigabit network. Radar signal sorting and EDW display are performed on the host computer.

[0069] In this embodiment, the radio frequency unit includes a selector, a down converter, and an up converter; wherein, in the calibration mode or the self-test mode, the up converter up-converts the calibration or self-test signal generated by the intermediate frequency processing unit to 2 to 18 GHz; in the reconnaissance mode, the down converter digitally down-converts the radar signal radiated from the antenna to an intermediate frequency signal with a center frequency of 1.8 GHz and an instantaneous bandwidth of 1 GHz, and then inputs the intermediate frequency signal into the intermediate frequency processing unit.

[0070] The workflow of the reconnaissance system is as follows:

[0071] 1) After turning on the machine, perform calibration first;

[0072] 2) After calibration, perform a self-test and observe the following status information, spectrum diagram, and measured radar parameters;

[0073] a) FPGA module temperature, ADC module clock lock status, DAC module clock lock status, and 10G Ethernet interface status;

[0074] b) Whether the spectrum of the self-test signal is consistent with the set frequency;

[0075] c) Whether the measured radar parameters are consistent with the set parameters;

[0076] 3) If the self-test is normal, you can proceed to the next step. Otherwise, troubleshoot according to the prompts.

[0077] 4) The device enters reconnaissance mode and starts after setting the threshold;

[0078] 5) The intermediate frequency processing unit performs radar signal detection and spectrum processing, and uploads the pulse description word PDW to the main control computer;

[0079] 6) After sorting, the main control computer displays the parameters and spectrum of the received radar signals.

[0080] Through the above design, the present invention integrates the acquisition, spectrum monitoring, and radar signal detection functions into a single system, sharing a common set of hardware and software. This allows for portability, meeting functional requirements while reducing hardware and software development and maintenance costs and increasing hardware utilization. The present invention uses a frequency polling table to configure the radio frequency; only the center frequency local oscillator to be used needs to be configured in the table. The current frequency range is 2 to 18 GHz. Increasing the frequency range to above 18 GHz does not require secondary software development; only a new frequency polling table needs to be configured.

[0081] The above embodiment is only one of the preferred implementation methods of the present invention and should not be used to limit the scope of protection of the present invention. Any changes or modifications that have no substantive meaning made to the main design concept and spirit of the present invention, as long as the technical problems solved are still consistent with the present invention, should be included in the scope of protection of the present invention.

Claims

1. An ultra-wideband radar signal reconnaissance system with spectrum monitoring, characterized in that: It includes a main control computer, an intermediate frequency processing unit, an antenna, a radio frequency unit, and a power supply. Radar signals in space are received by the antenna and sent to the radio frequency unit. The multiplexer in the radio frequency unit down-converts the radar signal according to the working mode and sends it to the intermediate frequency processing unit. The intermediate frequency processing unit completes spectrum processing, intermediate frequency acquisition, channel calibration, and radar signal measurement. Finally, the data is transmitted to the main control computer via the 10 Gigabit network interface. The main computer completes the panoramic spectrum display, intermediate frequency data storage, and radar signal parameter display. The main control computer is used to complete parameter configuration and radar signal parameter display; the configuration method of the main control computer is as follows: a. Configure the working mode switching module to switch and display the calibration mode, self-test mode, reconnaissance mode and acquisition mode; b. Configuration parameter module, used to set threshold value, self-test frequency, and self-test pulse width parameters; c. Configure the data statistics module to display the radar signal parameter-time curve; d. Configure the status monitoring module to monitor the operating status of the functional modules; e. Configure the spectrum display module to view the spectrum graph and waterfall graph; f. Configure a signal acquisition module to collect radar signals; g. Configure a radar signal parameter display module to display the parameters of the collected radar signal; h. Configure the radiation source library to import and export radar radiation sources; The intermediate frequency processing unit is used to realize real-time spectrum processing of sampled data, intermediate frequency acquisition, system calibration, radio frequency control and radar signal parameter measurement; The antenna is used to receive airborne radar signals in the frequency range of 2 to 18 GHz; The radio frequency unit is used to implement up-conversion and down-conversion processing of the signal; The power supply is used to provide +24V DC power to the radio frequency unit and the intermediate frequency processing unit.

2. The ultra-wideband radar signal reconnaissance system with spectrum monitoring according to claim 1, characterized in that: The intermediate frequency processing unit includes an FPGA module, a DAC module, an ADC module, a GPIO module, and an optical port, all of which are connected to the FPGA module; wherein the optical port is connected to a main control computer via a 10 Gigabit network, and the DAC module, ADC module, and GPIO module are all connected to the intermediate frequency processing unit; Real-time spectrum processing samples data through the ADC module and transmits the sampled data to the main control computer, where spectrum splicing is completed and a panoramic spectrum graph is finally displayed. The IF acquisition process down-converts and decimates the ADC data to 300 MHz. Four half-band filters are then cascaded to create IF signals with bandwidths of 120 MHz, 60 MHz, 30 MHz, and 15 MHz. These signals are then transmitted to the host computer via a 10 Gigabit Ethernet network for storage. System calibration is performed by calculating the calibration coefficients every 2 MHz. The obtained calibration coefficients are finally transmitted to the main control computer via the 10 Gigabit network for storage and then sent to the FPGA when needed. The RF control function uses the RF control module to control the frequency band according to the established polling table, completing the frequency band coverage of 2~18GHz; Radar signal parameter measurement uses channelization technology and interferometer virtual baseline method to obtain the pulse description word PDW before sorting: center frequency, bandwidth, pulse width, pulse repetition period, pulse amplitude, azimuth arrival angle; the pulse description word PDW is transmitted to the main control computer through the 10 Gigabit network, and the radar signal is sorted and the radiation source description word EDW is displayed on the main control computer.

3. The ultra-wideband radar signal reconnaissance system with spectrum monitoring according to claim 2, characterized in that: The data display module displays radar signal parameter-time curves including "PRI cycle-time", "center frequency-time", "bandwidth-time", "pulse width-time", and "pulse amplitude-time" graphs.

4. The ultra-wideband radar signal reconnaissance system with spectrum monitoring according to claim 3, characterized in that: The functional modules monitored by the status monitoring module include the radio frequency unit, FPGA module and 10 Gigabit network.

5. The ultra-wideband radar signal reconnaissance system with spectrum monitoring according to claim 4, characterized in that: The data collected by the signal acquisition module are pulse description word PDW, radiation source description word EDW, broadband FFT and intermediate frequency.

6. The ultra-wideband radar signal reconnaissance system with spectrum monitoring according to claim 5, characterized in that: The parameters displayed by the radar signal parameter display module are the pulse description word PDW before sorting and the radiation source description word EDW after sorting.

7. The ultra-wideband radar signal reconnaissance system with spectrum monitoring according to claim 6, characterized in that: The radio frequency unit includes a selector, a down converter and an up converter; wherein, In the calibration mode or self-test mode, the up-conversion module converts the calibration or self-test signal generated by the intermediate frequency processing unit to a frequency range of 2 to 18 GHz. In the reconnaissance mode, the radar signal radiated from the antenna is digitally down-converted to an intermediate frequency signal with a center frequency of 1.8 GHz and an instantaneous bandwidth of 1 GHz, and then the intermediate frequency signal is input into the intermediate frequency processing unit.

8. The ultra-wideband radar signal reconnaissance system with spectrum monitoring according to claim 7, characterized in that: The workflow of the reconnaissance system is as follows: After powering on, calibrate first; After calibration, perform a self-test and observe the following status information, spectrum diagram, and measured radar parameters: FPGA module temperature, ADC module clock lock status, DAC module clock lock status, 10G Ethernet interface status; Check whether the spectrum of the self-test signal is consistent with the set frequency; Whether the measured radar parameters are consistent with the set parameters; If the self-test is normal, you can proceed to the next step, otherwise troubleshoot according to the prompts; The device enters the reconnaissance mode and starts after setting the threshold; The intermediate frequency processing unit performs radar signal detection and spectrum processing, and uploads the pulse description word PDW to the main control computer; 6) After sorting, the main control computer displays the parameters and spectrum of the received radar signals.

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