CN114578337A - Digital multi-beam low-small-slow detection radar capable of transmitting phase-scanning wide beam and receiving wide beam - Google Patents
Digital multi-beam low-small-slow detection radar capable of transmitting phase-scanning wide beam and receiving wide beam Download PDFInfo
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- CN114578337A CN114578337A CN202210236345.1A CN202210236345A CN114578337A CN 114578337 A CN114578337 A CN 114578337A CN 202210236345 A CN202210236345 A CN 202210236345A CN 114578337 A CN114578337 A CN 114578337A
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
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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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- 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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S2013/0236—Special technical features
- G01S2013/0245—Radar with phased array antenna
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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Abstract
The invention discloses a digital multi-beam 'low-small-slow' detection radar for transmitting phase-scanning wide beams and receiving the wide beams. The digital signal processing unit generates a transmitting digital intermediate frequency signal, and the transmitting digital intermediate frequency signal is converted into an analog signal by the high-speed DA module and then is sent to the analog phase modulation unit. The beam control unit can control the analog phase change to realize the directional change of the transmitted wide beam and close part of the transmitting array elements to realize the change of the coverage range of the transmitting angle by controlling the analog phase modulation unit; the beam control unit can flexibly form m paths of digital narrow beams by controlling the beam synthesis unit and can control the beam pointing in real time.
Description
Technical Field
The invention belongs to the technical field of detection radars, and particularly relates to a digital multi-beam low-small-slow detection radar capable of transmitting phase-scanning wide beams and receiving the wide beams.
Background
Phased array radars, i.e., phase-controlled electronically scanned array radars, utilize a large number of individually controlled small antenna elements arranged into an antenna array, each antenna element being controlled by an independent phase-shifting switch, and by controlling the phase emitted by each antenna element, beams of different orientations can be synthesized.
Digital beam forming technology is widely applied in the field of radar signal processing, and can change the amplitude and phase between antenna elements in a digital mode and simultaneously form a plurality of beams at different pitching angles and azimuth angles. Conventional beamforming has lower flexibility and accuracy compared to data beamforming techniques.
The phased array radar has the advantage of electronic scanning, and the digital beam forming has the advantage of simultaneous multi-beam, but the phased array radar has too low time efficiency because only one beam scans the whole airspace; digital beamforming has several beams, is very time-resource efficient, but consumes too many analog channels.
Disclosure of Invention
The invention aims to provide a low-slow detection radar based on phase-scanning wide beam emission and digital multi-beam reception, and the circuit can take the advantages of a phased array radar and a digital beam radar into account.
The technical solution for realizing the purpose of the invention is as follows: a digital multi-beam ' low-small-slow ' detection radar capable of transmitting phase-scanning wide beams and receiving low-small-slow ' signals. The low-small-slow detection radar comprises a transmitting antenna array surface of N array elements, a receiving antenna array surface of M array elements, an analog phase modulation unit, M analog channels, a high-speed AD module, a high-speed DA module, a digital signal processing unit, a beam control unit, a beam synthesis unit and the like. Firstly, a digital signal processing unit generates a transmitting intermediate frequency signal, the transmitting intermediate frequency signal is converted into an analog signal by a high-speed DA module and then is sent to an analog phase modulation unit; secondly, the beam control unit controls the analog phase modulation unit to convert the analog signals into N paths of radio frequency signals after phase modulation, and then the radio frequency signals are transmitted out through transmitting antennas of N array elements; the wave beam control unit realizes the wide wave beam emission (the wide wave beam angle is covered by theta) by adjusting the phase of the N paths of analog signals1) In the space scanning, the change of the coverage angle range of transmitting a transmitting wide beam is realized by closing a plurality of N paths of signals (the coverage angle of the wide beam after the change is theta)2，θ2＞θ1) (ii) a Then, the receiving antenna array surfaces of the M array elements receive echo signals from a target and send the echo signals to M analog channels, the M analog channels convert the received M echo radio-frequency signals into intermediate-frequency signals and send the intermediate-frequency signals to a high-speed AD module, and the high-speed AD module converts the M analog intermediate-frequency signals into digital signals and sends the digital signals to a beam synthesis unit of a digital signal processing module; finally, the beam synthesis unit synthesizes the input digital signals of the M array elements into M paths of digital narrow beams (the angle of the narrow beams is covered by theta)3，θ3＜＜θ1) The pointed signal is output. Wherein, the beam control unit controls the beam synthesis module to synthesize M paths of digital narrow beams (the sum of the angles covered by the M paths of narrow beams is theta) according to the direction pointing of the transmitting beam for the input M paths of intermediate frequency digital signals4，θ4≥θ1)。
Further, simulatingThe phase modulation unit adjusts the direction of a wide beam emission angle of the antenna by controlling the analog phase of the emission signal so as to realize the scanning in the whole airspace; the change of the coverage angle range of the transmitted wide beam is realized by closing a plurality of partial N paths of signals (the coverage angle of the wide beam after the change is theta)2，θ2＞θ1)。
Further, the beam control unit realizes a transmission of a wide beam (wide beam angle coverage is θ) by adjusting the phase of the N analog signals1) In the space scanning, the change of a wide beam covering angle range is realized by closing a plurality of N paths of analog signals (the wide beam angle coverage after conversion is theta)2，θ2＞θ1) (ii) a And synthesizing M paths of digital narrow beams according to the direction of the transmitted beams by controlling the beam synthesis module to the input M paths of intermediate frequency digital signals.
Further, the beam synthesis unit synthesizes the input digital signals of the M array elements into M paths of digital narrow beams (each narrow beam has an angle covering theta)3，θ3＜＜θ1(ii) a And the sum of the angles covered by the m narrow beams is theta4，θ4≥θ1) And the coverage range of the wide beam can be covered, and the m-path narrow beams synchronously change along with the change of the pointing direction of the wide beam, and the coverage range of the wide beam can still be covered.
Compared with the prior art, the invention has the following remarkable advantages: the invention gives consideration to the advantages of the phased array radar and the digital multi-beam radar at the same time, and meanwhile, the time efficiency is superior to the phased array radar, the cost is lower than that of the digital multi-beam radar, the invention has higher applicability and universality, high time efficiency and very high flexibility and precision, and the beam control unit can control the analog phase change by controlling the analog phase modulation unit so as to realize the directional change of transmitting the wide beam and close part of the transmitting array elements to realize the change of the coverage range of the transmitting angle; the beam control unit can flexibly form m paths of digital narrow beams by controlling the beam synthesis unit and can control the beam pointing in real time.
Drawings
FIG. 1 is a schematic diagram of the general structure of a digital multi-beam "low-small-slow" detection radar of the present invention which transmits phase-scanning wide-beam reception;
FIG. 2 is a schematic diagram of an analog phase modulation unit according to the present invention;
FIG. 3 is a diagram of the transmit beam broadening and the original transmit beam pattern of the present invention;
FIG. 4 is a schematic diagram of a beam forming unit according to the present invention;
fig. 5 is a broad beam and narrow beam simultaneous coverage pattern of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings.
As shown in fig. 1 to 5, a digital multi-beam "slow-low" detection radar that transmits phase-swept wide-beam reception, comprises: firstly, a digital signal processing unit generates a transmitting digital intermediate frequency signal, and the transmitting digital intermediate frequency signal is converted into an analog signal by a high-speed DA module and then is sent to an analog phase modulation unit; secondly, the beam control unit controls the analog phase modulation unit to convert the analog signals into N paths of radio frequency signals after phase modulation, and then the radio frequency signals are transmitted out through transmitting antennas of N array elements; the beam control unit realizes the space scanning of a transmitted wide beam (the wide beam angle coverage is theta 1) by adjusting the phases of the N paths of analog signals, and realizes the change of the coverage angle range of the transmitted wide beam by closing a plurality of paths of N paths of signals (the changed wide beam angle coverage is theta 2, and theta 2 is more than theta 1); then, the receiving antenna array surfaces of the M array elements receive echo signals from a target and send the echo signals to M analog channels, the M analog channels convert the received M radio frequency echo signals into intermediate frequency signals and send the intermediate frequency signals to a high-speed AD module, and the high-speed AD module converts the M analog intermediate frequency signals into digital signals and sends the digital signals to a beam synthesis unit of a digital signal processing module; and finally, the beam synthesis unit synthesizes the input digital signals of the M array elements into M (M is determined according to the receiving coverage range and the beam interval) digital narrow beams (the angle of the narrow beams is covered by theta 3, and theta 3 < theta 1) pointing signals and outputs the signals, wherein the beam control unit controls the beam synthesis module to point the input M intermediate frequency digital signals into M digital narrow beams according to the direction of the transmitted beams (the angle covered by the M narrow beams is theta 4, and theta 4 is more than or equal to theta 1).
The analog phase modulation unit adjusts the direction of a wide beam emission angle of the antenna by controlling the analog phase of the emission signal so as to realize the scanning in the whole airspace; the change of the coverage angle range of the transmitted wide beam is realized by closing a plurality of paths of partial N paths of signals (the coverage angle of the wide beam after the change is theta 2, and theta 2 is larger than theta 1).
The beam control unit realizes the space scanning of a transmitted wide beam (the wide beam angle coverage is theta 1) by adjusting the phases of the N paths of analog signals, and realizes the change of the wide beam coverage angle range by closing a plurality of paths of the N paths of analog signals (the converted wide beam angle coverage is theta 2, and theta 2 is more than theta 1); the amplitude phase weighting is carried out on the input M paths of intermediate frequency digital signals through the control beam synthesis module, and M paths of digital narrow beams are synthesized according to the direction of the transmitted beam.
The wave beam synthesis unit carries out amplitude phase weighting on the input M array element digital signals, and synthesizes M paths of digital narrow wave beams (the angle of each narrow wave beam is covered by theta 3, theta 3 is less than theta 1, the angle sum covered by the M paths of narrow wave beams is theta 4, theta 4 is more than or equal to theta 1), the coverage range of the wide wave beams can be covered, the M paths of narrow wave beams can synchronously change along with the change of the direction of the wide wave beam to be transmitted, and the coverage range of the wide wave beam to be transmitted can still be covered.
The invention relates to a digital multi-beam 'low-small-slow' detection radar capable of transmitting phase-scanning wide beams and receiving, which comprises a transmitting antenna array surface with N array elements, a receiving antenna array surface with M array elements, an analog phase modulation unit, M analog channels, a high-speed AD module, a high-speed DA module, a digital signal processing unit, a beam control unit, a beam synthesis unit and the like, wherein the specific structure is shown in figure 1.
Firstly, a digital signal processing unit generates an intermediate frequency transmitting signal, the intermediate frequency transmitting signal is converted into an analog signal by a high-speed DA module and then is sent to an analog phase modulation unit; and secondly, the beam control unit controls the analog phase modulation unit to convert the analog signals into N paths of radio frequency signals after phase modulation, and then the radio frequency signals are transmitted out through the transmitting antennas of the N array elements.
Fig. 2 is a structure diagram of an analog phase modulation unit, and an intermediate frequency analog signal output by a high-speed DA module is firstly mixed into a transmission radio frequency signal through an upper mixer, and then phase modulation is performed on the transmission signal through a phase modulator (phase modulator) realized by using a multiplier, the array surface of N array elements is composed of N groups of structures shown in fig. 2, and the N phase modulation outputs are connected to the N array elements and then radiated outwards by an antenna.
The wave beam control unit realizes the wide wave beam emission (the wide wave beam angle is covered by theta) by adjusting the phase change of the N paths of analog signals1) In the space scanning, the change of the coverage angle range of a wide beam is transmitted by closing a plurality of N paths of signals (the coverage angle of the wide beam after the change is theta)2，θ2＞θ1). The original emission angle and the broadened emission angle are shown in fig. 3.
Then, the receiving antenna array surfaces of the M array elements receive echo signals from a target and send the echo signals to M analog channels, the M analog channels convert the received M echo radio-frequency signals into intermediate-frequency signals and send the intermediate-frequency signals to a high-speed AD module, and the high-speed AD module converts the M analog intermediate-frequency signals into digital signals and sends the digital signals to a beam synthesis unit of a digital signal processing module.
Finally, the beam synthesis unit synthesizes the input digital signals of the M array elements into M paths of digital narrow beams (the angle of the narrow beams is covered by theta)3，θ3＜＜θ1) And (3) directional signals are output, fig. 4 is a schematic structural diagram of a beam synthesis unit, and M paths of intermediate frequency digital signals are multiplied by M amplitude-phase weighting coefficients and then added and output to obtain 1 narrow beam output. Wherein, the beam control unit controls the beam synthesis module to synthesize M paths of digital narrow beams (the sum of the angles covered by the M paths of narrow beams is theta) according to the direction of the transmitted beam for the input M paths of intermediate frequency digital signals4，θ4≥θ1)。
The wave beam synthesis unit synthesizes the input M array element digital signalsm digital narrow beams (each narrow beam covering an angle theta)3，θ3＜＜θ1(ii) a And the sum of the angles covered by the m narrow beams is theta4，θ4≥θ1) And the coverage range of the wide beam can be covered, and the m-path narrow beams synchronously change along with the change of the pointing direction of the wide beam, and the coverage range of the wide beam can still be covered. Fig. 5 is a wide beam and narrow beam simultaneous coverage pattern. Wherein the middle is receiving narrow beams with narrow beam angle coverage of theta3Outside is the emission of a wide beam with a wide beam angle coverage of θ1. The sum of the angles covered by the m narrow beams is theta4(θ4＝m*θ3)＞θ1(or theta)2)。
Claims (4)
1. A digital multi-beam 'slow-low' detection radar for transmitting phase-scanning wide-beam reception, comprising: firstly, a digital signal processing unit generates a transmitting digital intermediate frequency signal, and the transmitting digital intermediate frequency signal is converted into an analog signal by a high-speed DA module and then is sent to an analog phase modulation unit; secondly, the beam control unit controls the analog phase modulation unit to convert the analog signals into N paths of radio frequency signals after phase modulation, and then the radio frequency signals are transmitted out through transmitting antennas of N array elements; the wave beam control unit realizes the wide wave beam emission (the wide wave beam angle is covered by theta) by adjusting the phase of the N paths of analog signals1) In the space scanning, the change of the coverage angle range of a wide beam is transmitted by closing a plurality of N paths of signals (the coverage angle of the wide beam after the change is theta)2，θ2＞θ1) (ii) a Then, the receiving antenna array surface of M array elements receives echo signals from a target and sends the echo signals to M analog channels, the M analog channels convert the received M radio frequency echo signals into intermediate frequency signals and send the intermediate frequency signals to a high-speed AD module, the high-speed AD module converts the M analog intermediate frequency signals into digital signals and sends the digital signals to the beam combination of a digital signal processing moduleForming a unit; finally, the beam synthesis unit synthesizes the input digital signals of the M array elements into M (M is determined according to the receiving coverage range and the beam interval) paths of digital narrow beams (the narrow beam angle coverage is theta)3，θ3<<θ1) And the beam control unit controls the beam synthesis module to directionally synthesize M digital narrow beams (the sum of the angles covered by the M narrow beams is theta) according to the transmitting beam direction for the input M intermediate frequency digital signals4，θ4≥θ1)。
2. The digital multi-beam 'low-small-slow' detection radar capable of transmitting and phase-scanning wide-beam receiving according to claim 1, wherein the analog phase modulation unit adjusts the direction of the wide-beam transmitting angle of the antenna by controlling the analog phase of the transmitted signal so as to realize scanning in the whole airspace; the change of the coverage angle range of the transmitted wide beam is realized by closing a plurality of paths of partial N paths of signals (the coverage angle of the wide beam after the change is theta2，θ2＞θ1)。
3. The digital multi-beam low-small-slow detection radar for transmitting and phase-scanning wide-beam reception according to claim 1, wherein the beam control unit implements a transmitting wide beam (wide beam angular coverage is θ) by adjusting the phases of the N analog signals1) In the space scanning, the change of a wide beam covering angle range is realized by closing a plurality of N paths of analog signals (the wide beam angle coverage after conversion is theta)2，θ2＞θ1) (ii) a And the amplitude phase weighting is carried out on the input M paths of intermediate frequency digital signals by controlling the beam synthesis module, and M paths of digital narrow beams are synthesized according to the direction of the transmitted beam.
4. The radar according to claim 1, wherein the beam synthesis unit performs amplitude phase weighting on the input M array elements digital signals, and synthesizes M digital narrow beams (each narrow beam has an angle covering θ)3，θ3<<θ1(ii) a And the sum of the angles covered by the m narrow beams is theta4，θ4≥θ1) The coverage range of the wide beams can be covered, and the m paths of narrow beams can synchronously change along with the change of the pointing direction of the transmitted wide beams, and the coverage range of the transmitted wide beams can still be covered.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115336185A (en) * | 2022-06-30 | 2022-11-11 | 上海移远通信技术股份有限公司 | Communication method and terminal device |
| CN116087900A (en) * | 2023-03-10 | 2023-05-09 | 中安锐达(北京)电子科技有限公司 | Inter-travel detection vehicle-mounted platform for one-dimensional phased array radar |
| CN117031409A (en) * | 2023-09-28 | 2023-11-10 | 广州中雷电科科技有限公司 | Remote radar detection method, storage medium, and electronic apparatus |
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2022
- 2022-03-11 CN CN202210236345.1A patent/CN114578337A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115336185A (en) * | 2022-06-30 | 2022-11-11 | 上海移远通信技术股份有限公司 | Communication method and terminal device |
| CN115336185B (en) * | 2022-06-30 | 2024-04-23 | 上海移远通信技术股份有限公司 | Communication method and terminal equipment |
| CN116087900A (en) * | 2023-03-10 | 2023-05-09 | 中安锐达(北京)电子科技有限公司 | Inter-travel detection vehicle-mounted platform for one-dimensional phased array radar |
| CN116087900B (en) * | 2023-03-10 | 2023-06-06 | 中安锐达(北京)电子科技有限公司 | Inter-travel detection vehicle-mounted platform for one-dimensional phased array radar |
| CN117031409A (en) * | 2023-09-28 | 2023-11-10 | 广州中雷电科科技有限公司 | Remote radar detection method, storage medium, and electronic apparatus |
| CN117031409B (en) * | 2023-09-28 | 2024-01-12 | 广州中雷电科科技有限公司 | Remote radar detection method, storage medium, and electronic apparatus |
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