CN112485762B - Dual-frequency radar - Google Patents
Dual-frequency radar Download PDFInfo
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- CN112485762B CN112485762B CN202011094083.7A CN202011094083A CN112485762B CN 112485762 B CN112485762 B CN 112485762B CN 202011094083 A CN202011094083 A CN 202011094083A CN 112485762 B CN112485762 B CN 112485762B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 230000010355 oscillation Effects 0.000 claims abstract description 16
- 230000009977 dual effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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
- G01S7/28—Details of pulse systems
- G01S7/282—Transmitters
-
- 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
- G01S7/28—Details of pulse systems
- G01S7/285—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
- G01S7/35—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
-
- 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
Landscapes
- 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
The double-frequency radar comprises a main control module (01), a frequency conversion module (02), a double-frequency transmitting antenna (03) and a double-frequency receiving antenna (04). The main frequency synthesizer of the main control module generates electromagnetic wave signals of a first frequency band. The coupler of the main control module sends one path of electromagnetic wave signals of the first frequency band to the double-frequency transmitting antenna to be transmitted, and the other path of electromagnetic wave signals of the first frequency band to the frequency conversion module. The secondary frequency local oscillator generator of the frequency conversion module takes the frequency of the clock generator of the main control module as a reference source to generate local oscillator signals. The transmitting mixer of the frequency conversion module mixes the local oscillation signal and the electromagnetic wave signal of the first frequency band to generate the electromagnetic wave signal of the second frequency band. The receiving mixer of the frequency conversion module mixes the electromagnetic wave signal of the second frequency band reflected by the target with the local oscillation signal, moves the signal to the first frequency band, and then sends the signal to the main control module for processing. The dual-frequency radar achieves the effect of completely synchronizing the first frequency band and the second frequency band, is modularized in structure, is easy to produce in volume and is convenient to expand.
Description
Technical Field
The invention relates to a radar, in particular to a radar capable of simultaneously generating and transmitting electromagnetic waves with two different wavelengths.
Background
Microwave radar is an important remote sensing device. Radars of different wavelengths have different characteristics: the radar with high frequency has short wavelength, good propagation linearity, small antenna size, high imaging resolution, poor penetrability, easy phase turnover and high disentanglement difficulty due to short wavelength; the radar with low frequency (generally referred to as L-band and below) has longer wavelength, difficult phase overturning, good penetrability, capability of penetrating vegetation and even earth surface to acquire more accurate information, but needs a larger-sized antenna, and has less imaging details and low precision. If transmitting and receiving devices with different wavelengths can be integrated in one device, the phase relation between the transmitting and receiving devices and the receiving devices can be ensured, and data of the transmitting and receiving devices and the receiving devices can be processed uniformly, great progress can be brought to remote sensing. The existing double-frequency radar has the defects of complex structure, difficult synchronization of two frequency bands, difficult expansion and high cost.
Disclosure of Invention
Therefore, the invention provides the dual-frequency radar which can simultaneously generate and emit electromagnetic waves with two different wavelengths, ensure that the initial phases of the two electromagnetic waves are consistent, or the phase difference of the initial phases is controllable or known, and then simultaneously receive and process the electromagnetic waves with the two different wavelengths.
At least one embodiment of the invention provides a dual-frequency radar, which comprises a main control module, a frequency conversion module, a dual-frequency transmitting antenna and a dual-frequency receiving antenna.
The main control module comprises: a clock generator; a main frequency synthesizer for generating electromagnetic wave signals of a first frequency band; two receiving channels, which are used for single-frequency radar as multi-polarization receiving or multi-antenna receiving, or one of which is used for receiving electromagnetic wave signals of a first frequency band, and the other of which is used for receiving electromagnetic wave signals of a second frequency band transformed by the frequency conversion module; the coupler is used for sending one path of electromagnetic wave signals in the first frequency band to the double-frequency transmitting antenna to be transmitted, and sending the other path of electromagnetic wave signals in the first frequency band to the frequency conversion module, wherein the electromagnetic wave signals in the first frequency band transmitted are received through the double-frequency receiving antenna after being reflected by a target and enter one of the two receiving channels; and a master controller connecting the clock generator, the master frequency synthesizer and the two receive channels.
The frequency conversion module comprises:
the secondary frequency local oscillator generator is used for generating local oscillator signals by taking the frequency of the clock generator as a reference source;
the transmitting mixer is used for mixing the local oscillation signal with the electromagnetic wave signal of the first frequency band sent by the coupler in the main control module so as to generate the electromagnetic wave signal of the second frequency band; and
and the receiving mixer is used for mixing the electromagnetic wave signal of the second frequency band reflected by the target with the local oscillation signal, moving the signal to the first frequency band and then sending the signal to the other one of the two receiving channels of the main control module.
In some examples, the two receive channels are connected with a low noise amplifier that amplifies the signals they receive.
In some examples, the main frequency synthesizer is connected to a main frequency power amplifier that amplifies the electromagnetic wave signal of the first frequency band that it generates.
In some examples, the transmitting mixer is connected to a secondary frequency power amplifier for amplifying the electromagnetic wave signal of the second frequency band and delivering the amplified electromagnetic wave signal to the dual-frequency transmitting antenna.
In some examples, the receiving mixer is connected to a secondary frequency low noise amplifier that amplifies the electromagnetic wave signal of the second frequency band reflected back by the target.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
Fig. 1 is a block diagram of a dual-frequency radar system according to an embodiment of the present invention.
Fig. 2 is a block diagram of a main control module system according to an embodiment of the invention.
Fig. 3 is a block diagram of a frequency conversion module system according to an embodiment of the invention.
Detailed Description
The dual-frequency radar can simultaneously generate and emit electromagnetic waves with two different wavelengths, and ensure that the initial phases of the two electromagnetic waves are consistent, or the phase difference of the initial phases is controllable or known. Because the propagation speeds of the electromagnetic waves of the two frequency bands are almost the same, the time that the electromagnetic waves of the two frequency bands encounter the target and reflect back is almost the same, and the double-frequency radar needs to receive and process the two reflected signals simultaneously, and extracts effective information by combining the two reflected electromagnetic waves.
Fig. 1 is a block diagram of a dual-frequency radar system according to an embodiment of the present invention. As shown in fig. 1, the dual-frequency radar comprises a main control module 01, a frequency conversion module 02, a dual-frequency transmitting antenna 03 and a dual-frequency receiving antenna 04.
Fig. 2 shows a system block diagram of a master module 01, the master module 01 comprising a clock generator 101, a main frequency synthesizer 102, a main controller 103, a signal processor 104, two identical receive channels 105, 106 and corresponding low noise amplifiers 107, 108, a main frequency power amplifier 109 and a coupler 110. Fig. 3 shows a system block diagram of a frequency conversion module 02, where the frequency conversion module 02 includes a secondary frequency local oscillator generator 201, a transmit mixer 202, a secondary frequency power amplifier 203, a receive mixer 204, and a secondary frequency low noise amplifier 205.
The clock generator 101 is responsible for overall clock generation, ensuring the phase consistency of the system.
The main controller 103 is responsible for controlling the operation of the system, including controlling the main frequency synthesizer 102 to generate the desired waveforms, receiving and processing the received signals, sending the signals to the signal processor 104 for preprocessing, and transmitting the processing results to the user computer.
The main frequency synthesizer 102 is controlled by the main controller 103 to generate a main frequency (first frequency band) electromagnetic wave signal.
The receiving channels 105 and 106 can be configured as required, and can be used as multi-polarization receiving or multi-antenna receiving by single-frequency radar, or one channel can be used for receiving signals of a first frequency band, and the other channel can be used for receiving signals of a second frequency band transformed by the frequency conversion module 02.
The low noise amplifiers 107, 108 are connected to the receiving channels 105, 106, respectively, and amplify the signals as necessary.
The main frequency power amplifier 109 is connected to the main frequency synthesizer 102 and amplifies the transmit signal to a sufficient strength.
The coupler 110 distributes the signal in the first frequency band out of the path RF1 to the transmit mixer 202 of the frequency conversion module 02 as RF input to obtain the signal in the second frequency band.
The signal processor 104 is responsible for the necessary preprocessing of the received signal.
The frequency of the signal generated by the secondary frequency local oscillator generator 201 is determined by the frequency values of the primary frequency (first frequency band) and the secondary frequency (second frequency band), and may be the difference between the primary frequency and the secondary frequency. The frequency reference source of the secondary frequency local oscillator generator 201 is from the clock generator 104 of the main control module 01 to ensure synchronism.
The transmitting mixer 202 mixes the local oscillation signal generated by the secondary frequency local oscillation generator 201 and the signal of the first frequency band generated by the main control module 01, so as to obtain the signal of the second frequency band, and then the signal of the second frequency band is amplified by the secondary frequency power amplifier 203 and then sent to the dual-frequency transmitting antenna 03 for transmitting.
The secondary frequency low noise amplifier 205 amplifies the signal from the dual frequency receiving antenna 04, then enters the RF end of the receiving mixer 204, and the receiving mixer 204 mixes the local oscillator signal generated by the secondary frequency local oscillator generator 201 with the local oscillator signal, shifts to the primary frequency (the first frequency band), and then sends the primary frequency to the low noise amplifier 108 of the receiving channel 106 of the main control module 01.
When the primary frequency and the secondary frequency range are different, only the frequency of the local oscillation signal generated by the secondary frequency local oscillation generator 201 needs to be adjusted.
There are various solutions for the dual-frequency transmitting antenna 03 and the dual-frequency receiving antenna 04, and the description thereof will not be repeated.
In addition, the dual-frequency radar of the invention further comprises conventional radio frequency devices, such as necessary filters and the like, which are not described in detail.
The specific implementation will be described below taking the example that the main frequency (first frequency band) is 5300MHz to 5350MHz and the sub frequency (second frequency band) is 1250MHz to 1300 MHz.
In the master control module 01, the frequency of the clock generator 101 is 10MHz, and the clock signal, besides coordinating the operation of the master control module 01 and serving as the reference frequency of the main frequency synthesizer 102, needs to be distributed to the frequency conversion module 02 as the reference frequency of the auxiliary frequency local oscillator generator 201.
The main controller 103 controls the main frequency synthesizer 102 to generate a first frequency band sweep signal of 5300MHz to 5350MHz with 10MHz as a reference frequency.
The first frequency band sweep frequency signal is divided into three paths by the coupler 110 after being amplified by the main frequency power amplifier 109. The first path of signals is sent to the dual-frequency transmitting antenna 03, after being transmitted by the antenna, the signals are reflected by the object and received by the dual-frequency receiving antenna 04, filtered, sent to the receiving channel 105, processed and sent to the computer. The second path enters the mixer as a receive path local oscillator (this path signal is of conventional design and is not described in detail in this disclosure). The third path is sent to the frequency conversion module 02 as an intermediate frequency input to the transmit mixer 202.
The secondary frequency local oscillator generator 201 of the frequency conversion module 02 generates a local oscillator signal of 4050MHz by using the reference frequency of 10MHz sent from the Clk port by the clock generator 101 of the main control module 01, and the local oscillator signal is divided into two paths and respectively enters the transmitting mixer 202 and the receiving mixer 204. The local oscillation signal generated by the secondary frequency local oscillation generator 201 is mixed in the transmitting mixer 202, and the 5300MHz to 5350MHz first frequency band sweep signal sent from the RF1 port by the coupler 110 in the main control module 01 is further generated into 1250MHz to 1300MHz second frequency band sweep signal, and the second frequency band sweep signal is amplified by the secondary frequency power amplifier 203 and sent to the dual-frequency transmitting antenna 03. Electromagnetic waves in the second frequency band are reflected back after hitting a target, received by the double-frequency receiving antenna 04, filtered and amplified, and enter the receiving mixer 204. The receiving mixer 204 mixes the signal with the local oscillation signal generated by the secondary frequency local oscillation generator 201, moves the signal to the first frequency band (5300 MHz to 5350 MHz), then sends the signal to the receiving channel 106 of the main control module 01 (which is processed by the low noise amplifier 108), and the main control module 01 sends the signal to the computer after processing.
So far, the generation, transmission, reception and processing of signals of two frequency bands are completed.
In order to embody the advantage of flexibility of the invention, it is assumed that the radar is designed to be 5300MHz-5350MHz in the first frequency band and 400MHz-450MHz in the second frequency band, and only the local oscillation signal frequency generated by the auxiliary frequency local oscillation generator 201 of the frequency conversion module 02 is changed to 4900MHz, and the filter is changed to 400MHz-450 MHz.
And if the frequency band is designed to be 1250MHz to 1300MHz in the first frequency band and 400MHz to 450MHz in the second frequency band, only two frequency conversion modules are needed to be installed. The frequency conversion module has a structure which is simpler than that of the main module and has lower cost.
The dual-frequency radar implementation method provided by the invention has novel structure and high modularization degree, thereby achieving the effect of independent design and manufacture of the first frequency band and the second frequency band, and the two frequency bands are completely synchronous, flexible in expansion, low in cost and beneficial to popularization.
Claims (5)
1. The double-frequency radar is characterized by comprising a main control module (01), a frequency conversion module (02), a double-frequency transmitting antenna (03) and a double-frequency receiving antenna (04);
the main control module (01) comprises:
a clock generator (101);
a main frequency synthesizer (102) for generating an electromagnetic wave signal of a first frequency band with the frequency of the clock generator (101) as a reference source;
a receiving channel (105, 106) for performing single-frequency radar as multi-polarization reception or multi-antenna reception, or one channel for receiving electromagnetic wave signals of a first frequency band and the other channel for receiving electromagnetic wave signals of a second frequency band transformed by the frequency conversion module (02);
the coupler (110) is used for sending one path of electromagnetic wave signals in the first frequency band to the double-frequency transmitting antenna (03) to be transmitted, and sending the other path of electromagnetic wave signals in the first frequency band to the frequency conversion module (02), wherein the electromagnetic wave signals in the first frequency band to be transmitted are received through the double-frequency receiving antenna (04) after being reflected by a target, and enter one of the receiving channels (105, 106); and
a main controller (103) connected to the clock generator (101), the main frequency synthesizer (102) and the receive channels (105, 106);
the frequency conversion module (02) comprises:
a secondary frequency local oscillator generator (201) for generating a local oscillator signal with the frequency of the clock generator (101) as a reference source;
a transmitting mixer (202) for mixing the local oscillation signal and the electromagnetic wave signal of the first frequency band sent by the coupler (110) in the main control module (01), so as to generate the electromagnetic wave signal of the second frequency band, and the electromagnetic wave signal of the second frequency band is sent to the double-frequency transmitting antenna (03) to be transmitted; and
and the receiving mixer (204) is used for mixing the electromagnetic wave signal of the second frequency band reflected by the target with the local oscillation signal, moving the signal to the first frequency band and then sending the signal to the other one of the receiving channels (105, 106) of the main control module (01).
2. A dual frequency radar according to claim 1, characterized in that the receiving channel (105, 106) is connected with a low noise amplifier (107, 108) amplifying the signal it receives.
3. The dual-frequency radar according to claim 1, wherein a main frequency power amplifier (109) is connected to the main frequency synthesizer (102) for amplifying the electromagnetic wave signal of the first frequency band generated thereby.
4. A double frequency radar according to claim 1, characterized in that the transmitting mixer (202) is connected to a secondary frequency power amplifier (203) for amplifying the electromagnetic wave signal in the second frequency band to the double frequency transmitting antenna (03).
5. The dual-frequency radar according to claim 1, wherein a sub-frequency low-noise amplifier (205) for amplifying the electromagnetic wave signal of the second frequency band reflected by the target is connected to the receiving mixer (204).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011094083.7A CN112485762B (en) | 2020-10-14 | 2020-10-14 | Dual-frequency radar |
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| CN202011094083.7A CN112485762B (en) | 2020-10-14 | 2020-10-14 | Dual-frequency radar |
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| CN112485762A CN112485762A (en) | 2021-03-12 |
| CN112485762B true CN112485762B (en) | 2024-01-16 |
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| CN117420604B (en) * | 2023-12-19 | 2024-02-23 | 上海高晶检测科技股份有限公司 | Metal detector |
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| CN112485762A (en) | 2021-03-12 |
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