CN117008059A - Design method of low-altitude anti-interference receiving and transmitting integrated self-adaptive radar system - Google Patents
Design method of low-altitude anti-interference receiving and transmitting integrated self-adaptive radar system Download PDFInfo
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- CN117008059A CN117008059A CN202311125036.8A CN202311125036A CN117008059A CN 117008059 A CN117008059 A CN 117008059A CN 202311125036 A CN202311125036 A CN 202311125036A CN 117008059 A CN117008059 A CN 117008059A
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- 238000012544 monitoring process Methods 0.000 description 2
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Classifications
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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
-
- 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
- G01S7/35—Details of non-pulse systems
-
- 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
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
-
- 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
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
-
- 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
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
- G01S7/414—Discriminating targets with respect to background clutter
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
In order to solve the problem that the existing low-altitude radar cannot effectively inhibit the influence of ground clutter and sea clutter, the invention provides a design method of a low-altitude anti-interference receiving and transmitting integrated self-adaptive radar system, the method provides a structure and a function of a new system, provides a control delay multiple orthogonal signal mixing transmitting method and a secondary software mixing method of a detection target, obtains the distance, the speed and the acceleration of the detected target and the interference according to the signal processing result after the software mixing, greatly inhibits the interference of the ground clutter and the sea clutter according to the obtained distance, the speed and the acceleration information of the target and the interference, and improves the rapidity and the reliability of the system.
Description
Technical Field
The invention relates to a low-altitude airspace and sea area monitoring method, in particular to a low-altitude anti-interference receiving and transmitting integrated self-adaptive radar system design method, and belongs to the fields of safety and air traffic management.
Background
In the field of airport operation safety, flying birds and non-cooperative unmanned aerial vehicle targets pose a great threat to flight safety and significant economic losses. In terms of bird strikes, the aircraft takeoff and landing process is the stage where bird strikes are most likely to occur. More than 90% of birds are flying in airports and airspace around airports, 50% occur in airspace below 30 meters, and only 1% occur at altitudes above 760 meters. Because the flying speed of the aircraft is high, the aircraft is often damaged greatly after collision with the flying bird, and the aircraft is crashed seriously; at present, bird strike is one of important factors threatening aviation safety, and accurate detection, continuous tracking and effective identification of low and slow small targets are main tasks of reconnaissance monitoring; the radar system as the main detection device has two main problems in technical level:
(1) The current radar technology needs to transmit for the second time after the echo of the first transmitted signal arrives, the time period of the resolving speed is larger (especially for a remote target), a larger error is caused, the low-altitude radar which is commonly used at home and abroad at present is used for calculating, the scanning speed of 24 revolutions per minute is calculated, the time interval of the calculating speed is 2.5 seconds, the repeated positioning precision of the cradle head, the two-time beam angle detection environment, the accuracy of the two-time target azimuth and the like are required to be the same or very close within the time of 2.5 seconds, and the speed calculating error is very large; therefore, it is difficult to effectively suppress the sea clutter and the ground clutter by the multiple signal transmission method of the same azimuth;
(2) The radar has a beam angle, and the specific azimuth of the same target is difficult to determine by transmitting and receiving signals at adjacent positions; therefore, it is difficult to effectively suppress the sea clutter and the ground clutter by the adjacent position transmitting and receiving signal processing method;
thus, existing low-altitude radar systems face the following challenges in practical applications:
(1) The method has the advantages that under the conditions of large detection blind areas and large detection errors for low-altitude target radar detection, under the coupling of factors such as ground and sea clutter, ground object shielding and multipath, the detection and identification of targets are difficult;
(2) The existing continuous wave low-altitude radar adopts fixed transmitting frequency, so that different detection requirements of sea surface targets and air targets are difficult to consider, and a transceiver system is difficult to adapt to the requirements of rapid target detection and tracking;
(3) In low-altitude target radar detection, land and sea clutter is dense, model parameters dynamically change, target echoes tend to be annihilated in high-intensity and high-density background clutter, and rapid and reliable target detection is difficult.
Disclosure of Invention
In order to solve the problem that the existing low-altitude radar cannot effectively inhibit the influence of ground clutter and sea clutter, the invention provides a design method of a low-altitude anti-interference receiving and transmitting integrated self-adaptive radar system, the method provides a structure and a function of a new system, provides a control delay multiple orthogonal signal mixing transmitting method and a secondary software mixing method of a detection target, obtains the distance, the speed and the acceleration of the detected target and the interference according to the signal processing result after the software mixing, greatly inhibits the interference of the ground clutter and the sea clutter according to the obtained distance, the speed and the acceleration information of the target and the interference, and improves the rapidity and the reliability of the system.
The technical scheme adopted for solving the technical problems is as follows: a design method of a low-altitude anti-interference receiving-transmitting integrated self-adaptive radar system is characterized by comprising the following steps:
the method comprises the steps that firstly, a receiving part of a low-altitude anti-interference receiving and transmitting integrated self-adaptive radar system receives signals through an antenna, extracts carrier frequency signals through a high-frequency filter, then extracts baseband signals through a baseband signal extractor with or without frequency mixing, extracts baseband signals through a baseband signal filter, and sends signals obtained through an A/D converter to a central processing unit to carry out secondary software frequency mixing and signal processing after software frequency mixing; the low-altitude anti-interference receiving and transmitting integrated self-adaptive radar transmitting part is used for controlling carrier frequency and batch quadrature signal mixing by a central processing unit, and then is amplified by a radio frequency transmitting part and transmitted by a transmitting antenna;
step two, the central processing unit is controlled in
Generating a batch of quadrature signals at timeMixing to form a baseband signal, and controlling the transmitted radio frequency part to generate a given carrier signal to transmit the baseband signal;
wherein the method comprises the steps of，/>，/>Is a positive integer>For the occurrence interval of two orthogonal signals, +.>For the transmission interval of two batches of orthogonal signals, < >>Is the fundamental frequency of the probe signal;
step three, the secondary software mixing part carries out fundamental frequency omega software mixing on the signals acquired by the A/D through the internal module 1 of the central processing unit, carries out 2 times frequency 2 omega software mixing through the internal module 2 of the central processing unit,the internal module N of the CPU carries out N frequency multiplication Nomega software mixing, and then a common radar signal processing method is adopted to obtainTarget distance of moment，/>；
Step four, calculating according to the following mode
Wherein,for the distance of the detected object and the disturbance, +.>For the speed of the detected object and disturbance, +.>Acceleration for detected objects and disturbances, +.>And is also provided with，/>Calculating a function for the target and the interference speed, +.>Calculating a function for the target and the disturbance acceleration, +.>For the purpose of and interference->A calculation function of the order derivative;
step five, according to the obtained target and interference、/>、/>、/>、/>Determining a target or interference: the speed and the acceleration of ground clutter characteristics generated by the terrain features are close to zero, so that the removal is convenient; the sea clutter speed generated by the sea wave is obviously different from the moving speed of the moving target on the sea, and the removal is convenient.
The beneficial results of the invention are: the invention discloses a method for controlling and delaying mixed emission of a plurality of orthogonal signals of a detection target, which solves the technical bottlenecks of 'first-come-later' and 'last-come-first-come', can emit a plurality of orthogonal signals at one time according to a controllable time interval, can calculate information such as target distance, speed, acceleration and the like, greatly inhibits interference of ground clutter and sea clutter by utilizing the speed and acceleration information, and improves the rapidity and reliability of a system.
The invention will now be described in detail with reference to the drawings and the detailed description.
Drawings
FIG. 1, a low-altitude anti-interference receiving and transmitting integrated self-adaptive radar system;
fig. 2 shows a software mixing scheme of the low-altitude anti-interference receiving and transmitting integrated self-adaptive radar system.
Detailed Description
Reference is made to fig. 1 and 2.
The method comprises the steps that firstly, a receiving part of a low-altitude anti-interference receiving and transmitting integrated self-adaptive radar system receives signals through an antenna, extracts carrier frequency signals through a high-frequency filter, then extracts baseband signals through a baseband signal extractor with or without frequency mixing, extracts baseband signals through a baseband signal filter, and sends signals obtained through an A/D converter to an FPGA central processing unit to carry out secondary software frequency mixing and signal processing after software frequency mixing; the low-altitude anti-interference receiving and transmitting integrated self-adaptive radar transmitting part is used for controlling carrier frequency and batch quadrature signal mixing by an FPGA central processing unit, and then is amplified by a radio frequency transmitting part and transmitted by a transmitting antenna;
step two, controlling the FPGA central processing unit at
Generating a batch of quadrature signals at timeMixing to form a baseband signal, and controlling the transmitted radio frequency part to generate a given carrier signal to transmit the baseband signal;
wherein the method comprises the steps of，/>，/>For the occurrence interval of two orthogonal signals, +.>For the transmission interval of two batches of orthogonal signals, < >>Is the fundamental frequency of the probe signal;
step three, the secondary software mixing part mixes the signals acquired by the A/D with the fundamental frequency omega software by the FPGA internal module 1, with the frequency doubling 2 omega software by the FPGA internal module 2, with the frequency doubling 3 omega software by the FPGA internal module 3, with the frequency doubling 4 omega software by the FPGA internal module 4,the FPGA internal module 5 carries out 5 times frequency and 5 omega software mixing, and then a common radar signal processing method is adopted to obtainTarget distance of moment，/>；
Step four, calculating according to the following mode
Wherein,for the distance of the detected object and the disturbance, +.>For the speed of the detected object and disturbance, +.>Acceleration for detected objects and disturbances, +.>And is also provided with，/>Calculating a function for the target and the interference speed, +.>Calculating a function for the target and the disturbance acceleration;
step five, according to the obtained target and interference、/>、/>Determining a target or interference: the speed and the acceleration of ground clutter characteristics generated by the terrain features are close to zero, so that the removal is convenient; the sea clutter speed generated by the sea wave is obviously different from the moving speed of the moving target on the sea, and the removal is convenient.
Claims (1)
1. A design method of a low-altitude anti-interference receiving-transmitting integrated self-adaptive radar system is characterized by comprising the following steps:
the method comprises the steps that firstly, a receiving part of a low-altitude anti-interference receiving and transmitting integrated self-adaptive radar system receives signals through an antenna, extracts carrier frequency signals through a high-frequency filter, then extracts baseband signals through a baseband signal extractor with or without frequency mixing, extracts baseband signals through a baseband signal filter, and sends signals obtained through an A/D converter to a central processing unit to carry out secondary software frequency mixing and signal processing after software frequency mixing; the low-altitude anti-interference receiving and transmitting integrated self-adaptive radar transmitting part is used for controlling carrier frequency and batch quadrature signal mixing by a central processing unit, and then is amplified by a radio frequency transmitting part and transmitted by a transmitting antenna;
step two, the central processing unit is controlled in
Time of day generation of bulk quadrature signals +.>Mixing to form a baseband signal, and controlling the transmitted radio frequency part to generate a given carrier signal to transmit the baseband signal;
wherein the method comprises the steps of，/>，/>Is a positive integer>For the occurrence interval of two orthogonal signals, +.>For the transmission interval of two batches of orthogonal signals, < >>Is the fundamental frequency of the probe signal;
step three, the secondary software mixing part carries out fundamental frequency omega software mixing on the signals acquired by the A/D through the internal module 1 of the central processing unit, carries out 2 times frequency 2 omega software mixing through the internal module 2 of the central processing unit,the internal module N of the CPU carries out N frequency multiplication Nomega software mixing, and then a common radar signal processing method is adopted to obtainTarget distance of moment，/>；
Step four, calculating according to the following mode
，/>，，/>，/>Wherein->For the distance of the detected object and the disturbance, +.>For the speed of the detected object and disturbance, +.>Acceleration for detected objects and disturbances, +.>And->，/>Calculating a function for the target and the interference speed, +.>Calculating a function for the target and the disturbance acceleration, +.>For the purpose of and interference->A calculation function of the order derivative;
step five, according to the obtained target and interference、/>、/>、/>、/>Determining a target or interference: the speed and the acceleration of ground clutter characteristics generated by the terrain features are close to zero, so that the removal is convenient; the sea clutter speed generated by the sea wave is obviously different from the moving speed of the moving target on the sea, and the removal is convenient.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311125036.8A CN117008059A (en) | 2023-09-04 | 2023-09-04 | Design method of low-altitude anti-interference receiving and transmitting integrated self-adaptive radar system |
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| CN202311125036.8A CN117008059A (en) | 2023-09-04 | 2023-09-04 | Design method of low-altitude anti-interference receiving and transmitting integrated self-adaptive radar system |
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| CN117008059A true CN117008059A (en) | 2023-11-07 |
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