阅读说明：本技术 一种高精度测距的毫米波测距装置 (Millimeter wave range unit of high accuracy range finding ) 是由 王震 于 2019-11-30 设计创作，主要内容包括：本发明公开了一种高精度测距的毫米波测距装置,包括基带处理器、毫米波雷达芯片、电源模块、数据输出接口和外壳；所述外壳用于整个设备的保护作用；所述电源模块用于将直流电12V转换为毫米波雷达和基带处理器所需的电压；所述毫米波雷达芯片通过发射天线发射极窄的脉冲信号,通过接收天线接收目标的回波信号后并将回波信号经过下变频和数字化后的基带数字信号传给所述基带处理器；所述基带处理器用于对毫米波雷达芯片的工作控制和参数配置、回波信号的检测和测量工作,并将测量结果通过数据输出接口传出供使用。有益效果：大大提高测距精度,大大减小可探测最小距离到6cm,使用不再受限于载体与目标的相对速度；从而可以减小对泊车车位长度的要求。(The invention discloses a millimeter wave distance measuring device for high-precision distance measurement, which comprises a baseband processor, a millimeter wave radar chip, a power module, a data output interface and a shell, wherein the millimeter wave radar chip is connected with the baseband processor; the shell is used for protecting the whole equipment; the power supply module is used for converting the direct current of 12V into voltage required by the millimeter wave radar and the baseband processor; the millimeter wave radar chip receives an echo signal of a target through a receiving antenna and transmits a baseband digital signal obtained by down-converting and digitizing the echo signal to the baseband processor through a pulse signal with a narrow emitter of a transmitting antenna; the baseband processor is used for controlling the work and parameter configuration of the millimeter wave radar chip, detecting and measuring echo signals and transmitting the measurement result to the data output interface for use. Has the advantages that: the distance measurement precision is greatly improved, the detectable minimum distance is greatly reduced to 6cm, and the use is not limited by the relative speed of the carrier and the target any more; thus, the requirement for the length of the parking space can be reduced.)

1. The utility model provides a millimeter wave range unit of high accuracy range finding which characterized in that: the millimeter-wave radar antenna comprises a baseband processor (100), a millimeter-wave radar chip (200), a power module (300), a data output interface (400) and a shell (500);

the housing (500) is used for protecting the whole equipment;

the power supply module (300) is used for converting 12V direct current into voltage required by the millimeter wave radar and the baseband processor (100);

the millimeter wave radar chip (200) receives echo signals of a target through a receiving antenna by transmitting pulse signals with narrow emitters of the antenna and transmits baseband digital signals obtained by down-conversion and digitization of the echo signals to the baseband processor (100);

the baseband processor (100) is used for controlling the work and parameter configuration of the millimeter wave radar chip, detecting and measuring echo signals, and transmitting the measurement result to the data output interface for use.

2. The millimeter wave distance measuring device for measuring distance with high precision according to claim 1, wherein: the protective function of the shell (500) comprises water and sand prevention, and the shell (500) is made of plastic materials or die-cast aluminum.

3. The millimeter wave distance measuring device for measuring distance with high precision according to claim 1 or 2, wherein: the power supply module (300) converts the input direct current 12V into the direct current of 1.8V required by the millimeter wave radar chip (200) and the direct current of 3.3V required by the baseband processor (100).

4. The millimeter wave distance measuring device for measuring distance with high precision according to claim 3, wherein: the millimeter wave radar chip (200) transmits pulse signals with a certain width through a transmitting antenna, receives echo signals through a receiving antenna, completes down-conversion and digitization of the echo signals, and transmits baseband digital signals to the baseband signal processor (100) through an SPI bus.

5. The millimeter wave distance measuring device for measuring distance with high precision according to claim 4, wherein: the baseband processor (100) completes control of the millimeter wave chip and receiving processing of data after the equipment is powered on; including detection processing and distance measurement.

6. The millimeter wave distance measuring device for measuring distance with high precision according to claim 5, wherein: the detection adopts different detection methods, including only detecting the target closest to the device, and calculating the distance from the target to the device by calculating the time delay difference between the received signal and the transmitted signal, and the formula is as follows:

where C is the speed of light 299792458m/s, τ is the time delay of the received signal and the transmitted signal, and R is the distance of the target from the device.

7. The millimeter wave distance measuring device for measuring distance with high precision according to claim 5 or 6, wherein: the measuring equipment of the ultrasonic radar chip can measure short distance, the minimum measuring distance is less than 10cm, and the minimum blind area reaches 13.8 cm.

Technical Field

The invention relates to the technical field of millimeter wave radar ranging, in particular to a millimeter wave ranging device for high-precision ranging.

Background

In recent years, an autonomous parking scheme by fusing a camera and an ultrasonic radar is a mainstream autonomous parking scheme at present. However, due to the respective defects of the sensors, the length of the required parking space is large, great inconvenience is brought to parking and vehicle construction, and space is seriously wasted. The distance sensor is used for autonomous parking, the ultrasonic reversing radar is basically used at the present stage, but the ultrasonic radar has the defects of larger blind area and lower distance measurement precision due to the inherent defects of ultrasonic waves, so that the requirement on the length of a parking space is higher. The millimeter wave radar of the pulse system has excellent performance and high ranging precision, and the blind area only depends on the leakage degree of the chip transmitting signal during receiving and transmitting, so that the high-precision short-distance measurement can be obtained on the premise of controlling the leakage, and the requirements on a distance sensor used for autonomous parking are met.

However, the existing reversing radar adopts ultrasonic waves, and due to the inherent defects of the ultrasonic waves, the ranging precision is not high, the stability is poor, and the high-speed dynamic measurement is not suitable; due to the objective existence of aftershock of the ultrasonic probe, a blind area is large, and accurate measurement within 15cm is difficult to perform.

Disclosure of Invention

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.

The present invention has been made in view of the above-mentioned conventional problems.

Therefore, the technical problem solved by the invention is as follows: the problems of low distance measurement precision, poor stability and inapplicability to high-speed dynamic measurement caused by inherent defects of ultrasonic waves are solved.

In order to solve the technical problems, the invention provides the following technical scheme: a millimeter wave distance measuring device for high-precision distance measurement comprises a baseband processor, a millimeter wave radar chip, a power module, a data output interface and a shell; the shell is used for protecting the whole equipment; the power supply module is used for converting the direct current of 12V into voltage required by the millimeter wave radar and the baseband processor; the millimeter wave radar chip receives an echo signal of a target through a receiving antenna and transmits a baseband digital signal obtained by down-converting and digitizing the echo signal to the baseband processor through a pulse signal with a narrow emitter of a transmitting antenna; the baseband processor is used for controlling the work and parameter configuration of the millimeter wave radar chip, detecting and measuring echo signals and transmitting the measurement result to the data output interface for use.

As a preferable scheme of the millimeter wave distance measuring device for measuring distance with high precision in the present invention, wherein: the protective action of shell is including waterproof sand prevention, just the shell is for plastics material or die-casting aluminium to make.

As a preferable scheme of the millimeter wave distance measuring device for measuring distance with high precision in the present invention, wherein: and the power supply module converts the input direct current 12V into the direct current of 1.8V required by the millimeter wave radar chip and the direct current of 3.3V required by the baseband processor.

As a preferable scheme of the millimeter wave distance measuring device for measuring distance with high precision in the present invention, wherein: the millimeter wave radar chip transmits a pulse signal with a certain width through the transmitting antenna, receives an echo signal through the receiving antenna, completes down conversion and digitization of the echo signal, and transmits a baseband digital signal to the baseband signal processor through the SPI bus.

As a preferable scheme of the millimeter wave distance measuring device for measuring distance with high precision in the present invention, wherein: the baseband processor completes control of the millimeter wave chip and receiving processing of data after the equipment is powered on; including detection processing and distance measurement.

As a preferable scheme of the millimeter wave distance measuring device for measuring distance with high precision in the present invention, wherein: the detection adopts different detection methods, including only detecting the target closest to the device, and calculating the distance from the target to the device by calculating the time delay difference between the received signal and the transmitted signal, and the formula is as follows:

where C is the speed of light 299792458m/s, τ is the time delay of the received signal and the transmitted signal, and R is the distance of the target from the device.

As a preferable scheme of the millimeter wave distance measuring device for measuring distance with high precision in the present invention, wherein: the measuring equipment of the ultrasonic radar chip can measure short distance, the minimum measuring distance is less than 10cm, and the minimum blind area reaches 13.8 cm.

The invention has the beneficial effects that: the distance measurement precision is greatly improved, the detectable minimum distance is greatly reduced to 6cm, and the use is not limited by the relative speed of the carrier and the target any more; thus, the requirement for the length of the parking space can be reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:

fig. 1 is a connection block diagram of a millimeter wave ranging apparatus for high-precision ranging according to a first embodiment of the present invention;

FIG. 2 is a schematic illustration of a second embodiment of the test of the present invention;

FIG. 3 is a comparison of the dynamic test results of the second embodiment of the present invention;

fig. 4 is a schematic diagram of an apparatus module according to a second embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

The present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

Meanwhile, in the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.