CN114019463B - Based on digital initiative radar corrector system - Google Patents
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- CN114019463B CN114019463B CN202110667863.4A CN202110667863A CN114019463B CN 114019463 B CN114019463 B CN 114019463B CN 202110667863 A CN202110667863 A CN 202110667863A CN 114019463 B CN114019463 B CN 114019463B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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Abstract
The invention discloses a digital active radar corrector system, which is downloaded into a programmable logic array memory card after a time delay and frequency displacement program required by hardware language programming is passed through a personal computer, so that the programmable logic array can automatically generate a corresponding time sequence control signal after being restarted. The invention provides a digital active radar corrector system, which has the advantages of accurate overall structural design, reasonable and stable structure, easy deployment and use and low manufacturing cost, on one hand, the time delay can be controlled at the level of nanoseconds and the frequency displacement can be controlled at the level of hertz through the accurate control characteristic of digital signals, and the application of a microwave circuit can accurately control the transmitting power of the system, so the system has obvious cost advantages compared with other equipment, has good popularization value, is beneficial to the stability and reliability of radar image correction efficiency after the correction system is digitalized, provides the subsequent application of radar images, and ensures the image accuracy.
Description
Technical Field
The invention relates to the technical field of synthetic aperture radars, in particular to a digital-based active radar corrector system.
Background
As the use of synthetic aperture radar Systems (SAR) has become more and more popular, for example: geological investigation, homeland monitoring, topography transition, marine pollution and the like are important parts of the process of processing the synthetic aperture radar images, because the synthetic aperture radar images shot at different times can be influenced by atmospheric and microwave scattering, so that the intensity values of the images are changed. Thus, we can correct the synthetic aperture radar image using an Active Radar Corrector (ARC) or Corner Reflector (CR). However, when the Corner Reflector (CR) is deployed, a lot of manpower and labor and time are required, and a certain error angle exists in the setting of the corner reflector, so that the error of the correction value is caused, and the subsequent image use is affected. Therefore, the constraint of the entity deployment corner reflector is released, so that correction errors are minimized, and the circuit mode is adopted to replace manual deployment, so that the method has very important practical significance.
Furthermore, many areas are difficult or impossible to reach due to the topography, so that there is a difficulty in the task of deploying the corner reflectors, such as the inability to fix the corner reflectors at a fixed angle on the lake or sea surface, or on steep hills. On the basis of applying modern science, a correction system with practical significance is researched to replace a traditional manual deployment method, so that the correction system meets the correction precision requirement, achieves the correction accuracy and stability, and provides fundamental guarantee for the image correction quality.
However, the conventional active radar corrector uses an analog delay, and since the delay time generated by the analog delay is fixed, the power per one point is reduced, resulting in a limited bright spot generated on the image. Furthermore, the cost of applying a simulated retarder is high, greatly affecting the willingness to use a simulated retarder. The digital programmable logic gate array can not only simply adjust the required time delay and frequency shift, but also control the output power to be fixed and not to be attenuated, so that more virtual points can be generated and the movement range of the virtual points can be enlarged. After the moving range of the reference point is enlarged, the moving reference point can be moved to a deep mountain area and a sea surface which cannot be placed by the active radar corrector, and the control reference point required in correction is facilitated.
Therefore, how to drive the digital circuit, the programmable characteristics of the digital circuit are utilized to improve the calibration accuracy, which is needed to be solved. To this end, we propose a digital-based active radar corrector system.
Disclosure of Invention
Based on the technical problems in the background technology, the invention provides a digital active radar corrector system, which solves the problems in the background technology.
The invention provides the following technical scheme:
A digital-based active radar corrector system comprises a programmable logic array, a signal generating module and a microwave circuit,
The programmable logic array: after the time delay and frequency shift program required by the hardware language programming is passed through the personal computer, the time delay and frequency shift program is downloaded into the programmable logic array storage card, so that the programmable logic array can automatically generate corresponding time sequence control signals after being restarted, and the control signals are transmitted to the Serial Peripheral Interface (SPI) receiving port of the signal generator through the Serial Peripheral Interface (SPI) port;
The signal generation module: the signal generating module receives a time sequence control signal through the parallel data path interface, generates a corresponding digital signal through a direct digital frequency synthesizer (DDS) arranged on the signal development board, converts the digital signal into an analog signal through a digital-to-analog converter (DAC), and sends the analog signal to the microwave circuit mixer through the radio frequency SMA interface;
after the original signal is received by the receiving antenna, the microwave circuit amplifies the signal through the low-noise amplifier, then filters partial noise through the filter, the signal enters the mixer to mix the intermediate frequency, the intermediate frequency signal and the adjustable signal manufactured by the signal generator are mixed, then filters the noise, amplifies the signal through the power amplifier, and then transmits the amplified signal to the free space through the transmitting antenna, and after the radar system receives the signal, the final correction result can be displayed through the image processing flow.
Preferably, the system comprises the steps of:
A. After programming the programmable logic gate array through the time delay and the frequency shift which are set in advance, the programmable logic gate array generates corresponding time sequence control sequence signals according to the setting, and the time sequence control signals are transmitted to the signal generating module through a Serial Peripheral Interface (SPI) port;
B. After receiving the time sequence control signal, the signal generating module generates a digital signal, and the digital signal is converted into an analog signal by a digital-to-analog converter (DAC) and then is transmitted to the microwave circuit;
C. After receiving radar signals, the receiving antenna performs a signal amplification process through a low-noise amplifier, filters through a filter, filters out additional noise, and mixes the signals with analog signals generated by a signal generator after the signals are reduced to intermediate frequency through a mixer;
D. The mixed signal is up-converted to the original frequency and then transmitted to a transmitting antenna through a filtering and power amplifier, and the signal is transmitted to free space.
Preferably, the programmable logic gate array comprises a programmable logic array chip body, a programmable logic array development board, wherein the development board is provided with a memory, a Serial Peripheral Interface (SPI) port, a joint test working group, a CompactFlash (CF card), a clock source, a digital-to-analog converter and a 12V power supply, after programming parameters required by time delay and frequency displacement on a personal computer, the programmable logic array is opened, the program is downloaded into CompactFlash (CF card) through the joint test working group after the programmable logic array power supply is opened, the programmable logic array chip reads hardware to program and generates a corresponding time sequence control signal with the clock source, the time sequence control signal is transmitted to a Serial Peripheral Interface (SPI) receiving port of a signal generator through the Serial Peripheral Interface (SPI) port, and in addition, a digital signal can be directly generated, converted into an analog signal through the digital-to-analog converter, and the analog signal is transmitted into a mixer for time delay control.
Preferably, the signal generating module comprises a signal generator and a signal development board, the signal development board is provided with a direct digital frequency synthesizer (DDS), a digital-to-analog converter (DAC), a parallel data path interface, a 1.8V/3.3V power supply and a radio frequency SMA interface, the parallel data path interface is connected with a programmable logic array Sequence Peripheral Interface (SPI) port, and after receiving a control time sequence control signal, the signal development board controls the direct digital frequency synthesizer (DDS) to generate a digital signal, and the digital signal is output to the microwave circuit mixer through the radio frequency SMA interface by the digital-to-analog converter.
Preferably, the microwave circuit includes a low noise amplifier, a filter, a mixer, a power amplifier and a local oscillator, the signal is amplified by the low noise amplifier after being received by the antenna receiving module, noise is removed by the filter, the signal is reduced to an intermediate frequency by the local oscillator and the mixer, the signal is mixed with the signal generated by the signal generator, and then the signal is raised to the original frequency by the local oscillator, the noise is removed by the filter, amplified by the power amplifier, and then transmitted to the free space by the transmitting antenna.
Preferably, the programmable logic array is of the type Spartan-6 FPGA SP605 Evaluation Kit, the development board is provided with a programmable logic array chip Spartan-6 xc6slx45t-3FGG484, the programmable logic array can be programmed according to the time delay and frequency displacement required, a port interface for converting USB to JTAG is provided for connecting with a personal computer to download a program, the development board is provided with a CompactFlash (CF card) and can store the downloaded program in the card, the step can enable the program to be started up automatically, the development board is further provided with a clock source and can drive a time sequence signal, the time sequence signal is transmitted to a Serial Peripheral Interface (SPI) receiving port of the signal generator through a Serial Peripheral Interface (SPI) port, the development board is provided with a digital-to-analog converter, and the digital signal can be directly generated and converted into an analog signal through the digital-to-analog converter and transmitted to the microwave circuit air mixer to achieve the time delay requirement.
Preferably, the signal generating module adopts an AD9914 development board of an adenno semiconductor, the development board is provided with a Sequence Peripheral Interface (SPI) receiving port for receiving the time sequence control signal and then controlling a direct digital frequency synthesizer (DDS) to generate a corresponding digital signal, and meanwhile, the development board is provided with a digital-to-analog converter for converting the digital signal generated by the direct digital frequency synthesizer into an analog signal, and the analog signal is transmitted to the microwave circuit through a radio frequency SMA interface.
Preferably, the microwave circuit adopts a radio frequency module of Mini-Circuits, and the circuit comprises a low-noise amplifier, a filter, a mixer, a multiplier, a local oscillator and a power amplifier, and the elements are determined according to the system frequency.
The invention provides a digital active radar corrector system, which has the advantages of accurate overall structural design, reasonable and stable structure, easy deployment and use and low manufacturing cost, on one hand, the time delay can be controlled at the level of nanoseconds and the frequency displacement can be controlled at the level of hertz through the accurate control characteristic of digital signals, and the application of a microwave circuit can accurately control the transmitting power of the system, so the system has obvious cost advantages compared with other equipment, has good popularization value, is beneficial to the stability and reliability of radar image correction efficiency after the correction system is digitalized, provides the subsequent application of radar images, and ensures the image accuracy.
Drawings
FIG. 1 is a schematic diagram of a system of the present invention;
FIG. 2 is a block diagram of a programmable logic array in a system according to the present invention;
FIG. 3 is a circuit diagram of a signal generating module in the system of the present invention;
FIG. 4 is a circuit diagram of a signal generating module in the system of the present invention;
fig. 5 is a circuit diagram of a signal generating module in the system of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the system of the present invention includes a digital programmable logic gate array, a signal generating module and a microwave circuit, wherein the digital programmable logic gate array is powered on and automatically programmed by downloading the program into the digital programmable logic gate array memory card of fig. 2 after the hardware language programming is performed on the personal computer according to the time delay and frequency displacement requirements, and fig. 3 is a signal generating module.
A digital-based active radar corrector system comprises a programmable logic array, a signal generating module and a microwave circuit,
Programmable logic array: the programmable logic gate array comprises a programmable logic array chip body, a programmable logic array development board, wherein the development board is provided with a memory, a Serial Peripheral Interface (SPI) port, a joint test working group, a CompactFlash (CF card), a clock source, a digital-to-analog converter and a 12V power supply, the programmable logic array is restarted and then automatically generates corresponding time sequence control signals, the control signals are transmitted to a Serial Peripheral Interface (SPI) receiving port of a signal generator through a Serial Peripheral Interface (SPI) port, the programmable logic gate array comprises a programmable logic array chip body and a programmable logic array development board, the programmable logic array development board is provided with a memory, the Serial Peripheral Interface (SPI) port, a joint test working group, a CompactFlash (CF card), a clock source, a digital-to-analog converter and a 12V power supply, and after the programmable parameters required by time delay and frequency displacement are programmed on the personal computer, after the programmable logic array power is turned on, the program is downloaded into compact flash (CF card) through the joint test working group, the programmable logic array chip reads the hardware to program and generates corresponding time sequence control signal with the clock source, and then the program is transmitted to the Serial Peripheral Interface (SPI) receiving port of the signal generator through the Serial Peripheral Interface (SPI) port, and the digital signal can be directly generated, converted into analog signal through the digital-analog converter and transmitted to the mixing player for time delay control, the programmable logic array adopts model Spartan-6 FPGA SP605 Evaluation Kit, the development board has programmable logic array chip Spartan-6 XC6SLX45T-3FGG484, can be programmed according to the required time delay and frequency displacement, has USB to JTAG port interface for connecting with the personal computer for downloading the program, the development board has compact flash (CF card), the download program can be stored in the card, the step can enable the program to be started up and automatically executed, the development board is also provided with a clock source, can drive time sequence signals, and then transmits the time sequence signals to a Serial Peripheral Interface (SPI) receiving port of the signal generator through a Serial Peripheral Interface (SPI) port, and the development board is provided with a digital-to-analog converter, so that the digital signals can be directly generated, converted into analog signals through the digital-to-analog converter and transmitted to the microwave circuit air mixer to achieve the time delay requirement;
A signal generation module: the signal generating module receives a time sequence control signal through a parallel data path interface, a direct digital frequency synthesizer (DDS) is arranged through a signal development board to generate a corresponding digital signal, the digital signal is converted into an analog signal through a digital-to-analog converter (DAC), the analog signal is sent into a microwave circuit mixer through a radio frequency SMA interface, the signal generating module comprises a signal generator and a signal development board, the signal development board is provided with the direct digital frequency synthesizer (DDS), the digital-to-analog converter (DAC), the parallel data path interface, a 1.8V/3.3V power supply and the radio frequency SMA interface, the parallel data path interface is connected with a programmable logic array Sequence Peripheral Interface (SPI) port, the digital signal is controlled to generate a digital signal after the control time sequence control signal is received, the digital signal is output into the microwave circuit mixer through the radio frequency SMA interface, the signal generating module adopts an AD9914 development board of a Adenox semiconductor, and the development board is provided with a Sequence Peripheral (SPI) receiving port to receive the time sequence control signal, the direct digital frequency synthesizer (DAC) is controlled to generate the corresponding digital signal, and the digital signal can be converted into the digital signal through the radio frequency SMA interface through the radio frequency synthesizer;
After the original signal is received by the radar system, the final correction result can be displayed through the image processing flow, the microwave circuit comprises a low-noise amplifier, a filter, a power amplifier and a local oscillator, the signal is received by the antenna receiving module, is amplified by the low-noise amplifier, is removed by the filter, is reduced to an intermediate frequency by the local oscillator and the mixer, is mixed with the signal generated by the signal generator, is increased to the original frequency by the local oscillator, is removed by the filter, is amplified by the power amplifier, is transmitted to the free space by the transmitting antenna, and adopts a radio frequency module of Mini-Circuits.
Further, the system comprises the steps of:
A. After programming the programmable logic gate array through the time delay and the frequency shift which are set in advance, the programmable logic gate array generates corresponding time sequence control sequence signals according to the setting, and the time sequence control signals are transmitted to the signal generating module through a Serial Peripheral Interface (SPI) port;
B. After receiving the time sequence control signal, the signal generating module generates a digital signal, and the digital signal is converted into an analog signal by a digital-to-analog converter (DAC) and then is transmitted to the microwave circuit;
C. After receiving radar signals, the receiving antenna performs a signal amplification process through a low-noise amplifier, filters through a filter, filters out additional noise, and mixes the signals with analog signals generated by a signal generator after the signals are reduced to intermediate frequency through a mixer;
D. The mixed signal is up-converted to the original frequency and then transmitted to a transmitting antenna through a filtering and power amplifier, and the signal is transmitted to free space.
The present invention is not limited to the above-mentioned embodiments, and any person skilled in the art, based on the technical solution of the present invention and the inventive concept thereof, can be replaced or changed within the scope of the present invention.
Claims (8)
1. A corrector system based on digital initiative radar comprises a programmable logic gate array, a signal generation module and a microwave circuit, and is characterized in that:
The programmable logic gate array: after the time delay and frequency shift program required by the hardware language programming is passed through the personal computer, the time delay and frequency shift program is downloaded into the programmable logic gate array storage card, so that the programmable logic gate array can automatically generate corresponding time sequence control signals after being restarted, and the control signals are transmitted to the Serial Peripheral Interface (SPI) receiving port of the signal generator through the Serial Peripheral Interface (SPI) port;
The signal generation module: the signal generating module receives a time sequence control signal through the parallel data path interface, generates a corresponding digital signal through a direct digital frequency synthesizer (DDS) arranged on the signal development board, converts the digital signal into an analog signal through a digital-to-analog converter (DAC), and sends the analog signal to the microwave circuit mixer through the radio frequency SMA interface;
after the original signal is received by the receiving antenna, the microwave circuit amplifies the signal through the low-noise amplifier, then filters partial noise through the filter, the signal enters the mixer to mix the intermediate frequency, the intermediate frequency signal and the adjustable signal manufactured by the signal generator are mixed, then filters the noise, amplifies the signal through the power amplifier, and then transmits the amplified signal to the free space through the transmitting antenna, and after the radar system receives the signal, the final correction result can be displayed through the image processing flow.
2. A digital-based active radar corrector system as in claim 1, wherein: the system comprises the following steps:
A. after programming the programmable logic gate array through the time delay and the frequency shift which are set in advance, the programmable logic gate array generates corresponding time sequence control sequence signals according to the setting, and the time sequence control signals are transmitted to the signal generating module through a Serial Peripheral Interface (SPI) port;
B. After receiving the time sequence control signal, the signal generating module generates a digital signal, and the digital signal is converted into an analog signal by a digital-to-analog converter (DAC) and then is transmitted to the microwave circuit;
C. After receiving radar signals, the receiving antenna performs a signal amplification process through a low-noise amplifier, filters through a filter, filters out additional noise, and mixes the signals with analog signals generated by a signal generator after the signals are reduced to intermediate frequency through a mixer;
D. The mixed signal is up-converted to the original frequency and then transmitted to a transmitting antenna through a filtering and power amplifier, and the signal is transmitted to free space.
3. A digital-based active radar corrector system as in claim 1, wherein: the programmable logic gate array comprises a programmable logic gate array chip body and a programmable logic gate array development board, wherein a memory, a Serial Peripheral Interface (SPI) port, a joint test work group, a compact flash (CF card), a clock source, a digital-to-analog converter and a 12V power supply are arranged on the development board, after programming parameters required by time delay and frequency displacement on a personal computer, the programmable logic gate array is opened, the program is downloaded into the compact flash (CF card) through the joint test work group after the programmable logic gate array power supply is opened, the programmable logic gate array chip reads hardware to program and generates a corresponding time sequence control signal with the clock source, the time sequence control signal is transmitted to a Serial Peripheral Interface (SPI) receiving port of a signal generator through the Serial Peripheral Interface (SPI) port, and in addition, a digital signal can be directly generated, converted into an analog signal through the digital-to-analog converter, and the analog signal is transmitted into a mixer for time delay control.
4. A digital-based active radar corrector system as in claim 1, wherein: the signal generation module comprises a signal generator and a signal development board, wherein the signal development board is provided with a direct digital frequency synthesizer (DDS), a digital-to-analog converter (DAC), a parallel data path interface, a 1.8V/3.3V power supply and a radio frequency SMA interface, the parallel data path interface is connected with a programmable logic gate array Sequence Peripheral Interface (SPI) port, and after receiving a control time sequence control signal, the signal generation module controls the direct digital frequency synthesizer (DDS) to generate a digital signal, and the digital signal is output to the microwave circuit mixer through the radio frequency SMA interface by the digital-to-analog converter.
5. A digital-based active radar corrector system as in claim 1, wherein: the microwave circuit comprises a low-noise amplifier, a filter, a mixer, a power amplifier and a local oscillator, wherein the signal is received by the antenna receiving module and amplified by the low-noise amplifier, noise is removed by the filter, the signal is reduced to an intermediate frequency by the local oscillator and the mixer, mixed with the signal generated by the signal generator, and then is up-converted to the original frequency by the local oscillator, noise is removed by the filter, amplified by the power amplifier, and transmitted to a free space by the transmitting antenna.
6. A digital-based active radar corrector system as in claim 1, wherein: the programmable logic gate array adopts the model number Spartan-6FPGA SP605 Evaluation Kit, the development board is provided with a programmable logic gate array chip Spartan-6XC6SLX45T-3FGG484, programming can be carried out according to time delay and frequency displacement, a port interface for converting USB into JTAG is provided, the development board is used for being connected with a personal computer to download programs, the development board is provided with a CompactFlash (CF card) and can store the downloaded programs in the card, the step can enable the program to be started up automatically, the development board is further provided with a clock source and can drive time sequence signals, the time sequence signals are transmitted to a Serial Peripheral Interface (SPI) receiving port of a signal generator through a Serial Peripheral Interface (SPI) port, and a digital-to-analog converter is arranged on the development board, so that the digital signals can be directly generated, converted into analog signals through the digital-to be transmitted to a microwave circuit air mixer, and the time delay requirement is achieved.
7. A method of using a digital-based active radar corrector system as in claim 1, wherein: the signal generating module adopts an AD9914 development board of Adenode semiconductor, the development board is provided with a Sequence Peripheral Interface (SPI) receiving port for receiving the time sequence control signal and then controlling a direct digital frequency synthesizer (DDS) to generate corresponding digital signals, and meanwhile, the development board is provided with a digital-to-analog converter for converting the digital signals generated by the direct digital frequency synthesizer into analog signals, and the analog signals are transmitted to a microwave circuit through a radio frequency SMA interface.
8. A method of using a digital-based active radar corrector system as in claim 1, wherein: the microwave circuit adopts a radio frequency module of Mini-Circuits, and comprises a low-noise amplifier, a filter, a mixer, a multiplier, a local oscillator and a power amplifier, wherein the elements are determined according to the system frequency.
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| RU56653U1 (en) * | 2006-03-15 | 2006-09-10 | Открытое акционерное общество "Концерн "Гранит-Электрон" | RADAR STATION |
| CN105045763A (en) * | 2015-07-14 | 2015-11-11 | 北京航空航天大学 | FPGA (Field Programmable Gata Array) and multi-core DSP (Digital Signal Processor) based PD (Pulse Doppler) radar signal processing system and parallel realization method therefor |
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