CN113325372A - Vehicle-mounted MIMO radar random coding waveform modulation method - Google Patents
Vehicle-mounted MIMO radar random coding waveform modulation method Download PDFInfo
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- CN113325372A CN113325372A CN202110716788.6A CN202110716788A CN113325372A CN 113325372 A CN113325372 A CN 113325372A CN 202110716788 A CN202110716788 A CN 202110716788A CN 113325372 A CN113325372 A CN 113325372A
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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
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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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- 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
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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
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
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- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a random coding waveform modulation method for a vehicle-mounted MIMO radar, and belongs to the field of millimeter wave radars. The method comprises the following steps: firstly, setting a radar to be in a random coding mode; by arranging the random signal generator, the random signal generator is reset when the radar signal is transmitted, and a group of random codes are generated; after generating random codes, writing the random codes into a register, and modulating radar signals by calling the codes in the register when the radar transmits the radar signals each time; and inputting the demodulated data in the radio frequency chip into a decoder to generate a decoded receiving signal, so that a receiving end can receive an echo signal reflected by the transmitted radar signal after encountering an obstacle. According to the invention, each initial phase of the transmitted pulse is randomly coded in the processor, and the transmitted signals with different codes do not interfere with each other, so that a plurality of millimeter wave radars can be used in the same environment, the robustness of the system is increased, and the anti-interference capability of the rail transit radar can be greatly improved.
Description
Technical Field
The invention relates to the technical field of millimeter wave radars, in particular to a random coding waveform modulation method for a vehicle-mounted MIMO radar.
Background
With the rapid development of millimeter wave chip technology, millimeter wave radars are widely applied in civil markets such as automatic driving, intelligent security, intelligent transportation and intelligent home. Compared with sensors such as laser, ultrasonic wave and camera, the millimeter wave radar has the advantages of long detection distance, all weather, high reliability and the like.
The existing vehicle-mounted millimeter wave radar is mainly designed and developed aiming at a highway scene, the problems of short detection distance, low azimuth resolution, poor anti-interference capability and the like exist in the rail transit scene, the application requirement is difficult to meet, and the MIMO (multiple-input multiple-output multiple-receive) millimeter wave radar effectively increases the antenna aperture of the radar through a multi-radio-frequency chip cascade technology, has the characteristics of high resolution and long detection distance, can increase the diversity of target information, and improves the anti-interference capability of the radar. The existing MIMO radar mostly adopts time-sharing MIMO waveforms, and has the defects of short detection distance, low angle measurement precision, poor anti-interference capability and the like under a high-speed train moving platform. In the rail transit industry, the train-mounted millimeter wave radar needs to realize high-precision detection on a long-distance obstacle, and meanwhile, due to more noise interference in a rail transit scene, the traditional millimeter wave radar adopting time-sharing MIMO waveforms may not meet actual requirements.
Disclosure of Invention
The invention aims to provide a random coding waveform modulation method for a vehicle-mounted MIMO radar. According to the random coding waveform modulation method for the vehicle-mounted MIMO radar, the random coding modulation is carried out on the transmitting signal of each frame, the azimuth resolution is high, the detection distance is long, and the anti-interference capability is strong, and the technical scheme adopted by the invention is as follows:
according to one aspect of the invention, a vehicle-mounted MIMO radar random coding waveform modulation method is provided, and comprises the following steps:
(1) setting a transmitting mode and a receiving mode of the radar to be random coding modes;
(2) a random signal generator is arranged in a processor of the radar, when the radar signal is transmitted, the random signal generator in the processor is reset according to a certain time interval, a group of random codes are generated at the time interval, the code length is the accumulated number of radar transmission pulses, and the code number is the number of transmission channels;
(3) after generating random codes, writing the random codes into a primary phase modulation control register of a corresponding transmitting channel of a radio frequency chip in the radar, and modulating the radar signals by calling the codes in the primary phase modulation control register when the radar transmits the radar signals each time;
(4) modulating a transmission mode of a radio frequency chip into a mode capable of transmitting a modulated radar signal;
(5) and inputting the demodulated data in the radio frequency chip into a decoder to generate a receiving signal which is coded and decoded in a corresponding transmitting channel, so that a receiving end of the radar can receive an echo signal which is reflected by the transmitted radar signal after encountering an obstacle.
Preferably, 4 AWR2243 transmitting chips are cascaded at the radio frequency front end of the radar, each transmitting chip transmits 3 and receives 4, 12 transmitting channels and 16 receiving channels are provided, each transmitting signal carries out 6-byte encoding on the initial phase, 64 code words are provided, and the length of the encoding sequence of each transmitting channel is 256.
Preferably, the maximum speed measurement range of the radar is as follows: 400km/h to 50 km/h.
Preferably, the radar has a detection distance of more than 120 meters for a target with a radar scattering cross section of more than 1 square meter and a detection distance of more than 500 meters for a train with a radar scattering cross section of more than 30 square meters.
Preferably, the radar emission pulse repetition period is: 41.667 us.
The technical scheme adopted by the invention has the following remarkable effects:
(1) according to the invention, each initial phase of the transmitted pulse is randomly coded in the processor, and the transmitted signals of different codes do not interfere with each other, so that a plurality of millimeter wave radars can be used in the same environment, the robustness of the system is increased, and the anti-interference capability of the rail transit radar can be greatly improved;
(2) the invention simultaneously controls the multi-channel transmitting signal channels in real time, thereby avoiding Doppler phase difference introduced by time-sharing transmission;
(3) the invention enables the millimeter wave radar to have the capability of simultaneously transmitting 12 channels and receiving 16 channels, the more the transmitting and receiving channels are, the better the performance of the radar is, the azimuth resolution is improved to be more than 0.5 degrees, and the maximum detection distance of an object with the radar scattering cross section (RCS) larger than 30 square meters can be more than 500 meters.
Drawings
FIG. 1 is a schematic diagram of a single frame waveform of the present invention;
FIG. 2 is a random encoding table for the initial phase of the radar transmitted pulse.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples of preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
According to the random coding waveform modulation method of the vehicle-mounted MIMO radar, firstly, a transmitting mode and a receiving mode of the radar are set to be random coding modes; and a random signal generator is arranged in a processor of the radar, when the radar signal is transmitted, the random signal generator in the processor is reset according to a certain time interval, and the repetition period of the transmitted pulse is as follows: 41.667us, generating a group of random codes at the time interval, wherein the length of the group of random codes is the accumulated number of radar transmitting pulses, the accumulated number of pulses is 256, and the number of the random codes is the number of transmitting channels; the radio frequency front end of the radar adopts 4 AWR2243 transmitting chips to be cascaded, each transmitting chip transmits 3 and receives 4, and has 12 transmitting channels and 16 receiving channels, each transmitting signal carries out 6 byte coding on an initial phase, 64 code words are totally formed, and the length of a coding sequence of each transmitting channel is 256; secondly, after the random code is generated, writing the random code into a primary phase modulation control register of a corresponding transmitting channel of a radio frequency chip in the radar, and modulating the radar signal by calling the random code in the primary phase modulation control register when the radar transmits the radar signal each time; modulating a transmission mode of a radio frequency chip into a mode capable of transmitting a modulated radar signal; and finally, inputting the demodulated data in the radio frequency chip into a decoder to generate a receiving signal which is coded and decoded in a corresponding transmitting channel, so that a receiving end of the radar can receive an echo signal which is reflected by the transmitted radar signal after encountering an obstacle.
Wherein the starting frequency of the radar is 77GHz as shown in fig. 1-2; the bandwidth is 350 MHz; the number of transmitting antennas is 12; the number of receiving antennas is 16; the maximum speed measurement range is as follows: 400km/h to 50 km/h; the radar has a detection distance of more than 120 meters for a target with a radar scattering cross-sectional area (RCS) of more than 1 square meter and a detection distance of more than 500 meters for a train with a radar scattering cross-sectional area (RCS) of more than 30 square meters.
By the modulation method, the speed precision of the radar is better than 0.18m/s, the azimuth resolution is better than 0.5 degree, and the azimuth measurement precision is better than 0.05 degree.
The radar has the working frequency of 77GHz, the detection distance is far, and the radar has the capabilities of distance measurement, direction measurement, speed measurement and anti-interference, each frame of transmitted signals is subjected to random coding modulation, so that the problem of same-frequency asynchronous interference between the radars when a high-speed moving train runs in a crossing manner can be solved, the accumulation gain of the radars can be improved, the detection capability of the radars is increased, the requirement of the train on the high detection distance is met, the radar can be applied to a millimeter wave radar 4-chip cascade scheme, the simultaneous transmission of the signals by 12 transmitting channels is realized, echoes corresponding to the transmitted signals are separated from 16 receiving channels, the azimuth angle resolution is superior to 0.5 degrees, the distance resolution can reach 0.5 meter, the maximum detection distance can reach 500 meters, and the application requirement of rail transit is met.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (5)
1. A random coding waveform modulation method for a vehicle-mounted MIMO radar is characterized by comprising the following steps: the method comprises the following steps:
(1) setting a transmitting mode and a receiving mode of the radar to be random coding modes;
(2) a random signal generator is arranged in a processor of the radar, when the radar signal is transmitted, the random signal generator in the processor is reset according to a certain time interval, a group of random codes are generated at the time interval, the code length is the accumulated number of radar transmission pulses, and the code number is the number of transmission channels;
(3) after generating random codes, writing the random codes into a primary phase modulation control register of a corresponding transmitting channel of a radio frequency chip in the radar, and modulating the radar signals by calling the codes in the primary phase modulation control register when the radar transmits the radar signals each time;
(4) modulating a transmission mode of a radio frequency chip into a mode capable of transmitting a modulated radar signal;
(5) and inputting the demodulated data in the radio frequency chip into a decoder to generate a receiving signal which is coded and decoded in a corresponding transmitting channel, so that a receiving end of the radar can receive an echo signal which is reflected by the transmitted radar signal after encountering an obstacle.
2. The vehicle-mounted MIMO radar random coding waveform modulation method according to claim 1, wherein: the radio frequency front end of the radar adopts 4 AWR2243 transmitting chips to be cascaded, each transmitting chip transmits 3 and receives 4, 12 transmitting channels and 16 receiving channels are provided, each transmitting signal carries out 6 byte coding on an initial phase, 64 code words are provided, and the length of a coding sequence of each transmitting channel is 256.
3. The vehicle-mounted MIMO radar random coding waveform modulation method according to claim 1, wherein: the maximum speed measuring range of the radar is as follows: 400km/h to 50 km/h.
4. The vehicle-mounted MIMO radar random coding waveform modulation method according to claim 1, wherein: the radar has a detection distance of more than 120 meters for a target with a radar scattering sectional area of more than 1 square meter and a detection distance of more than 500 meters for a train with a radar scattering sectional area of more than 30 square meters.
5. The vehicle-mounted MIMO radar random coding waveform modulation method according to claim 1, wherein: the repetition period of the radar emission pulse is as follows: 41.667 us.
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| CN202110716788.6A CN113325372B (en) | 2021-06-25 | 2021-06-25 | Random coding waveform modulation method for vehicle-mounted MIMO radar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114812376A (en) * | 2022-04-21 | 2022-07-29 | 山东软科智能科技发展有限公司 | Vehicle tire pattern depth detection system and method |
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Cited By (2)
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| CN114812376B (en) * | 2022-04-21 | 2024-03-22 | 山东软科智能科技发展有限公司 | System and method for detecting depth of tire pattern of vehicle |
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