CN110954870A - High-integration Ka-band anti-interference speed measuring radar - Google Patents
High-integration Ka-band anti-interference speed measuring radar Download PDFInfo
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- CN110954870A CN110954870A CN201911366374.4A CN201911366374A CN110954870A CN 110954870 A CN110954870 A CN 110954870A CN 201911366374 A CN201911366374 A CN 201911366374A CN 110954870 A CN110954870 A CN 110954870A
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- 238000004519 manufacturing process Methods 0.000 abstract description 6
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- 230000005284 excitation Effects 0.000 description 4
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- 206010039203 Road traffic accident Diseases 0.000 description 2
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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
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
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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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/91—Radar or analogous systems specially adapted for specific applications for traffic control
- G01S13/92—Radar or analogous systems specially adapted for specific applications for traffic control for velocity measurement
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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
- G01S7/023—Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques
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Abstract
The invention discloses a high-integration Ka-band anti-interference speed measuring radar which comprises an oscillator, wherein the oscillator is sequentially connected with a frequency multiplier, a power divider C, a power divider A and a transmitting and receiving antenna; the power divider C is divided into two paths, one path is connected with the power divider A, the other path is connected with the branch line coupler, the power divider A is divided into two paths, one path is connected with the power divider C, and the other path is connected with the power divider B; the power divider B is divided into two paths and respectively connected with two frequency mixers, and the frequency mixers are sequentially connected with an amplifying filter and an ARM processor; the branch line couplers are respectively connected with the mixers. The invention has the advantages of low production cost, compact structure, small volume, high stability, excellent performance and reliable circuit performance, effectively ensures the accuracy of detecting the overspeed of the vehicle and can be widely applied to police snapshot speed measurement systems.
Description
Technical Field
The invention relates to the field of speed measuring radars, in particular to a high-integration speed measuring radar applied to a Ka wave band.
Background
In recent years, the holding quantity of motor vehicles is rapidly increased, the contradiction between the current situation of traffic management and the demand is further intensified, and the traffic control by using a traffic speed measuring system is particularly necessary. In order to reduce the traffic accidents caused by speeding, various traffic management systems use various methods to measure the speed of vehicles, such as by means of ground coils, video, radar, etc. However, various problems may also occur during the application process: 1) the ground induction coil needs to damage the road surface and is rolled for a long time, so that the problem of inaccurate speed measurement can occur; 2) the video speed measurement is easily interfered by the foggy weather, and the like.
The radar speed measurement is the most widely used method in the current stage, and can effectively facilitate traffic police law enforcement and reduce accidents. Traffic radars in the civil field currently mainly use three bands: x wave band (10.5 GHz +/-25 MHz), K wave band ((24.15GHz +/-45 MHz), Ka wave band (35.1GHz +/-100 MHz). the mature technical scheme based on K wave band, X wave band on the market is more, and the supporting products are mainly applied to the wave band, but the application of Ka wave band is less.
The radar speed measurement is to calculate the speed of a target by Doppler frequency shift by using Doppler effect. The radar speed measurement is widely applied due to the advantages of high accuracy, high speed, good stability, long detection distance, movable speed measurement and the like. However, the frequency of the X wave band and the K wave band is low, the interference of other signals is easy, the hidden danger of traffic accidents is increased invisibly, and the strict-law system management process of modern traffic is seriously influenced.
Aiming at the characteristic of high anti-interference performance of a Ka waveband, a plurality of technical schemes are applied at present, for example, Chinese patent application with the publication number of CN109975768A discloses a Ka waveband frequency synthesizer based on radar use, which comprises a signal source input circuit, a frequency synthesizer and a frequency synthesizer, wherein the Ka waveband frequency synthesizer is formed by connecting an 80MHZ crystal oscillator and a coupler in series, the 80MHZ crystal oscillator is used for generating an 80MHZ signal, and the coupler performs frequency division to obtain a local oscillator input signal and two local oscillator input signals; the excitation circuit comprises a first local oscillator circuit for outputting a local oscillator 16.8GHz signal, a second local oscillator circuit for outputting a second local oscillator 1.54GHz signal, and an excitation signal circuit, wherein the first local oscillator circuit and the second local oscillator circuit are connected in series, the output end of the second local oscillator circuit is connected to the input end of the first local oscillator circuit after being mixed with a 60MHz intermediate frequency signal, the output end of the first local oscillator circuit 2 after frequency multiplication and the output end of the first local oscillator circuit are connected to the input end of the second local oscillator circuit, the second local oscillator circuit is used for generating a 35.2GHz excitation signal, and the excitation signal suitable for radar products is output by using the scheme. The speed measuring radar is obviously complex to use and is not beneficial to portable use.
For another example, the patent of the invention granted by china with publication number CN103823218B discloses a Ka-band radar wave measuring device, which comprises an antenna, a circulator, a Ka-band TR component, and an integrated signal module, which are sequentially linked to form the antenna, the circulator, the Ka-band TR component, and the integrated signal module. The device is a linear frequency modulation system radar working in a Ka wave band, and can extract information such as the distance from waves to a transmitting point, the distance change rate (radial speed), the wave period and the like from echoes. The measuring device is suitable for various severe environments, does not need to be watched on duty, has high detection precision, is stable and reliable, has a light structure, can be used for shore-based measurement and shipborne measurement, and has wide application range. And is also not suitable for speed measurement due to the large size.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the anti-interference Ka-band speed measuring radar with high performance, low cost, high integration level.
The technical scheme adopted by the invention is as follows: the high-integration Ka-band anti-interference speed measuring radar comprises an oscillator, wherein the oscillator is sequentially connected with a frequency multiplier, a power divider C, a power divider A and a transmitting-receiving antenna; the power divider C is divided into two paths, one path is connected with the power divider A, the other path is connected with the branch line coupler, the power divider A is divided into two paths, one path is connected with the power divider C, and the other path is connected with the power divider B; the power divider B is divided into two paths and respectively connected with two frequency mixers, and the frequency mixers are sequentially connected with an amplifying filter and an ARM processor; the branch line couplers are respectively connected with the mixers.
As a further improvement of the present invention, the mixer includes a branch line coupler, and the branch line coupler is connected to two diodes in opposite directions.
As a further improvement of the present invention, the transceiver antenna is a microstrip antenna, and the branch line coupler and the mixer are manufactured by using microstrip circuit technology.
The invention has the following beneficial effects: the Ka-band speed measurement radar has the advantages of large Doppler frequency shift, high resolution, difficulty in interference and accurate speed measurement of captured vehicles. The receiving and transmitting antenna is a microstrip antenna, the frequency is generated by frequency multiplication, and the power divider is adopted for signal synthesis and distribution, so that the interference of receiving and transmitting signals can be effectively reduced, and the isolation is increased. And an amplification filter is adopted to strengthen the signal, so that the operational capability of the digital signal is effectively improved. The invention has the advantages of low production cost, compact structure, small volume, high stability, excellent performance and reliable circuit performance, effectively ensures the accuracy of detecting the overspeed of the vehicle and can be widely applied to police snapshot speed measurement systems.
Drawings
Fig. 1 is a schematic diagram of the principle of the present invention.
Fig. 2 is a schematic diagram of a mixer circuit according to the present invention.
Shown in the figure: the power divider comprises a receiving and transmitting antenna 1, a power divider A2, a power divider B3, a branch line coupler 4, a power divider C5, a frequency multiplier 6, an oscillator 7, a mixer 8, a diode 9, an amplifying filter 10 and an ARM processor 11.
Detailed Description
The invention will be further described with reference to fig. 1 and 2.
As shown in the figure, the high-integration-level Ka-band anti-interference speed measuring radar comprises an oscillator 7, wherein the oscillator 7 is sequentially connected with a frequency multiplier 6, a power divider C, a power divider a and a transmitting-receiving antenna 1; the power divider C is divided into two paths, one path is connected with the power divider A, the other path is connected with the branch line coupler 4, the power divider A is divided into two paths, one path is connected with the power divider C, and the other path is connected with the power divider B; the power divider B is divided into two paths and is respectively connected with two mixers 8, and the mixers 8 are sequentially connected with an amplifying filter 10 and an ARM processor 11; the branch line couplers 4 are connected to mixers 8, respectively.
The speed measuring radar of the structure adopts the same antenna to transmit signals and receive signals. The oscillator 7 generates Ka-band frequency through the frequency multiplier 6, is divided into two paths through the power divider A, one path is connected with the branch line coupler 4, the other path is connected with the power divider B, and then is radiated by the transceiving antenna 1 and is spread in the space in an electromagnetic wave mode. When the electromagnetic wave meets the vehicle in the space, the electromagnetic wave is reflected, and if the vehicle moves, the frequency of the reflected electromagnetic wave is added with a Doppler frequency which is proportional to the moving speed of the vehicle. The echo is received by the receiving and transmitting antenna 1, and is divided into two paths of echo signals through the power divider A and the power divider B, one path of echo signal is mixed with the branch line coupler 4 at the frequency mixer 8, the other path of echo signal is mixed with the branch line coupler 4 at the other frequency mixer 8, an I/Q orthogonal intermediate frequency signal is generated after frequency mixing, then the I/Q orthogonal intermediate frequency signal is connected to form a low-pass filter through the amplifying filter 10 for filtering, the filtered signal is sent to the ARM processor 11 for signal processing, and speed and direction information is sent out through a serial port after analysis.
The power divider C divides signals generated by the oscillator 7 into two paths after being amplified by the frequency multiplier 6, the power divider B divides echo signals into two paths, and the power divider has small insertion loss, good phase consistency and amplitude balance so as to ensure higher distribution. The power divider A transmits frequency-doubled signals, can receive reflected signals, can effectively isolate transmitted signals and received signals, and is simple in circuit form, small in size, convenient to machine, good in consistency and convenient to miniaturize and integrate equipment.
The oscillator 7 generates the required frequency through frequency doubling of the frequency multiplier 6, and has good frequency stability, low phase noise and high temperature stability and reliability; if the frequency module is directly adopted, the price is higher, and the mass production is not facilitated. And an active frequency device is selected for frequency doubling, so that the input power is low, amplification is not needed, the frequency doubling loss is small, frequency doubling gain can be generated, the frequency doubling efficiency is high, and the temperature stability is good.
In order to further improve the isolation of the invention and improve the anti-interference capability. The mixer 8 is mainly composed of a branch line coupler and two diodes with the same characteristics and opposite directions. The receiving signal of the transmitting-receiving antenna 1 is mixed with the oscillating signal generated by the oscillator through frequency doubling, and the nonlinearity of the diode is utilized to generate a new combined frequency for further signal processing. The branch line coupler in the frequency mixer has the function of impedance conversion, under the ideal matching condition, the power of a received signal and the power of a frequency source are added on the two diodes through the branch line coupler, and the branch line coupler enables the received signal and the oscillator to be well isolated, so that the isolation of each port is greatly improved, and the clutter suppression capability is strong. The mixer adopts a microstrip circuit design, so that the mixer is high in reliability, high in repeated production capacity and low in manufacturing cost; the generated I/Q orthogonal signal can provide the running direction and speed of the vehicle, and has the characteristics of low cost and high efficiency compared with other speed measuring radar systems.
In order to further improve the portability and reduce the weight of the invention, the receiving and transmitting antenna is designed by adopting a single antenna structure and is used for transmitting and receiving Ka-band frequency, and the receiving and transmitting antenna is processed by adopting a micro-strip, so that the invention has the advantages of easy commonality, small size, high gain and light weight.
In order to further improve the effect of the invention, the branch line coupler 4 adopts a microstrip circuit technology, is easy to be connected with other elements and has a simple structure. The method mainly divides the frequency generated by the oscillator after frequency multiplication into two paths to be mixed with echo signals.
The Ka-band speed measurement radar has the advantages of large Doppler frequency shift, high resolution, difficulty in interference and accurate speed measurement of captured vehicles. The receiving and transmitting antenna is a microstrip antenna, the frequency is generated by frequency multiplication, and the power divider is adopted for signal synthesis and distribution, so that the interference of receiving and transmitting signals can be effectively reduced, and the isolation is increased. And an amplification filter is adopted to strengthen the signal, so that the operational capability of the digital signal is effectively improved. The invention has the advantages of low production cost, compact structure, small volume, high stability, excellent performance and reliable circuit performance, effectively ensures the accuracy of detecting the overspeed of the vehicle and can be widely applied to police snapshot speed measurement systems.
It should be understood by those skilled in the art that the protection scheme of the present invention is not limited to the above-mentioned embodiments, and various permutations, combinations and modifications can be made on the above-mentioned embodiments without departing from the spirit of the present invention, and the modifications are within the scope of the present invention.
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| CN201911366374.4A CN110954870A (en) | 2019-12-26 | 2019-12-26 | High-integration Ka-band anti-interference speed measuring radar |
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|---|---|---|---|---|
| CN102445689A (en) * | 2011-12-01 | 2012-05-09 | 安徽蓝盾光电子股份有限公司 | Speed-measuring radar system with function of distinguishing vehicle direction |
| CN104076352A (en) * | 2014-06-27 | 2014-10-01 | 电子科技大学 | Low-interception speed measurement method and radar device |
| US20140292563A1 (en) * | 2012-12-20 | 2014-10-02 | The Board Of Regents Of The University Of Oklahoma | Radar System and Methods for Making and Using Same |
| US20160245913A1 (en) * | 2015-02-19 | 2016-08-25 | Korea Advanced Institute Of Science And Technology | Apparatus and method for measuring precipitation in the atmosphere using k-band frequency-modulated continuous wave (fmcw) weather radar system |
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| CN108459302A (en) * | 2018-02-11 | 2018-08-28 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Modulation Continuous Wave Radar receiving and transmitting front end |
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-
2019
- 2019-12-26 CN CN201911366374.4A patent/CN110954870A/en active Pending
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| US20160245913A1 (en) * | 2015-02-19 | 2016-08-25 | Korea Advanced Institute Of Science And Technology | Apparatus and method for measuring precipitation in the atmosphere using k-band frequency-modulated continuous wave (fmcw) weather radar system |
| CN106772297A (en) * | 2017-01-23 | 2017-05-31 | 上海广电通信技术有限公司 | Radar transmission power is measured and automatic frequency tracking system |
| CN108459302A (en) * | 2018-02-11 | 2018-08-28 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Modulation Continuous Wave Radar receiving and transmitting front end |
| CN211627808U (en) * | 2019-12-26 | 2020-10-02 | 安徽蓝盾光电子股份有限公司 | High-integration Ka-band anti-interference speed measuring radar |
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