WO2019127178A1

WO2019127178A1 - Intelligent vehicle-mounted radar device with reduced polarization loss

Info

Publication number: WO2019127178A1
Application number: PCT/CN2017/119234
Authority: WO
Inventors: 蒋欢
Original assignee: 广州兴普电子科技有限公司
Priority date: 2017-12-28
Filing date: 2017-12-28
Publication date: 2019-07-04

Abstract

Disclosed in the present invention is an intelligent vehicle-mounted radar device with reduced polarization loss. For an antenna module in the device, a dual-polarization antenna may be used, capable of measuring any polarization signal. Moreover, a polarization digital processor module performs real-time processing and extracts polarization information, thereby providing the features of high speed and real time. In addition, when a vehicle is traveling at high speed, polarization loss may occur in a vehicle-mounted radar device. The present invention can adjust polarization loss caused by resonance interference when the vehicle is traveling at high speed. That is, a vehicle speed detection trigger module detects the vehicle speed, and if the vehicle speed reaches a first predetermined value inducing resonance interference, a polarization control module controls the antenna module for polarization correction. Thus, the polarization loss of the intelligent vehicle-mounted radar device can be reduced and the performance of the intelligent vehicle-mounted radar device can be improved.

Description

Intelligent vehicle-mounted radar device for reducing polarization loss

Technical field

The present invention relates to the field of in-vehicle radar technology, and more particularly to an intelligent vehicle-mounted radar device that reduces polarization loss.

Background technique

With the development of the Internet of Vehicles technology, the application space of the vehicle radar technology is getting larger and larger. For example, there are many vehicles on the highway, and various accidents often occur. The vehicle radar device can measure and display the distance of the vehicle's external obstacles from the vehicle. The detection is quick and convenient, the calculation is simple, and it is easy to control in real time. However, how to better improve the performance of the intelligent vehicle-mounted radar device is a problem faced by the industry.

Summary of the invention

In view of the above problems, the embodiments of the present invention provide an intelligent vehicle-mounted radar device that partially or completely solves the above problems, which can effectively reduce the polarization loss of the intelligent vehicle-mounted radar device, thereby improving the performance of the intelligent vehicle-mounted radar device.

In order to solve the above technical problem, the present application adopts the following technical solutions:

An intelligent vehicle-mounted radar apparatus for reducing polarization loss according to an embodiment of the present invention includes: a transmitting unit that transmits a radar wave and a receiving unit that receives a radar wave transmitted from an external object, wherein

The receiving unit includes an antenna module, two microwave front end modules, a local oscillator module, two intermediate frequency amplifying modules, two analog to digital conversion modules, a memory module, a polarized digital processor module, a polarization control module, and a vehicle speed detection trigger. Module, rectifier module, transistor, first resistor, second resistor, first capacitor, first switch module;

The antenna module and the local oscillator module are both connected to two microwave front end modules, and the two microwave front end modules are respectively connected to two intermediate frequency amplifying modules, and the two intermediate frequency amplifying modules are respectively connected to two analog to digital conversion modules. The two analog-to-digital conversion modules are both connected to the memory module, the memory module is connected to the polarization digital processor module, the polarization control module is connected to the antenna module, and the vehicle speed detection trigger module and the first resistor a first capacitor and a base of the transistor are connected, a collector of the transistor is connected to the second resistor and the second switch module, and the second switch module is connected to the polarization control module through a rectifier module; After receiving the radar wave signal, the radar wave signal is selected by the corresponding microwave front end module, and is converted to the intermediate frequency by the intermediate frequency amplification module, and converted into a digital signal by the corresponding analog-to-digital conversion module, and the polarization digital processor module is passed through the memory module buffer. Polarization information is extracted from the information of the memory buffer, and the vehicle speed detection trigger module detects the vehicle When the speed is greater than the first predetermined value, triggering the first capacitor discharge causes the base of the transistor to be turned off, the collector potential to rise, thereby controlling the first switch module to be turned on, and the polarization control module controls the antenna module to perform polarization calibration .

According to an intelligent vehicle-mounted radar device according to an embodiment of the invention, the antenna module can adopt a dual-polarized antenna, that is, can measure an arbitrary polarization signal, and can process and extract polarization information in real time through a polarization digital processor module, which has a fast In real time, in addition, the vehicle radar device has a certain polarization loss when the vehicle is driving at a high speed. The invention can adjust the polarization loss formed by the resonance interference when the vehicle is running at a high speed, that is, the vehicle speed is detected by the vehicle speed detection trigger module. When the vehicle speed reaches the first predetermined value for forming the resonance interference, the polarization control module controls the antenna module to perform polarization calibration, thereby reducing the polarization loss of the smart vehicle radar device, thereby improving the performance of the intelligent vehicle radar device.

DRAWINGS

1 is a schematic diagram of the composition of an intelligent vehicle-mounted radar device according to the present invention;

2 is a block diagram showing the composition of a receiving unit in an intelligent vehicle-mounted radar device according to the present invention;

3 is a schematic diagram of a polarization control module for controlling a polarization control module in an intelligent vehicle-mounted radar device according to the present invention;

Figure 4 is a schematic illustration of the prevention of signal interference in a local oscillator module in an intelligent vehicle-mounted radar apparatus of the present invention.

Detailed ways

Referring to FIG. 1, a schematic diagram of a composition of an intelligent vehicle-mounted radar apparatus according to an embodiment of the present invention includes: a transmitting unit 1 that transmits a radar wave and a receiving unit 2 that receives a radar wave transmitted from an external object. Referring to FIG. 2, in order to implement polarization information. For example, the receiving unit 2 includes an antenna module 201, two microwave front end modules 202, a local oscillator module 203, two intermediate frequency amplifying modules 204, two analog to digital conversion modules 205, and a memory module 206. The polarization digital processor module 207 and the polarization control module 208. In addition, referring to FIG. 3, in order to achieve polarization interference control, the vehicle-mounted radar device of the present invention further includes a vehicle speed detection trigger module 209, a rectifier module 210, and a first The switch module 211, the transistor VT, the first resistor R1, the second resistor R2, the first capacitor C1;

In the specific implementation, the antenna module 201 and the local oscillator module 203 are both connected to two microwave front end modules 202, and the two microwave front end modules 202 are respectively connected to two intermediate frequency amplifying modules 204, and two intermediate frequency amplifying modules 204. Two analog-to-digital conversion modules 205 are respectively connected, and two analog-to-digital conversion modules 205 are connected to the memory module 206. The memory module 206 is connected to the polarization digital processor module 207, and the polarization control module 208 is The antenna module 201 is connected to the base, and the vehicle speed detecting trigger module 209 is connected to the first resistor R1, the first capacitor C1, and the base of the transistor VT. The collector of the transistor VT and the second resistor R2 are The first switch module 211 is connected, and the first switch module 211 is connected to the polarization control module 208 through the rectification module 210;

In a specific operation, the antenna module 201 is configured to receive a radar wave signal transmitted from an external object, and the microwave front end module 202 is configured to select a signal received by the antenna module 201 and mix the local oscillator signal transmitted from the local oscillator module 203 into an intermediate frequency. The signal, the intermediate frequency amplifying module 204 performs intermediate frequency amplification on the signal sent from the microwave front end module 202, and the analog to digital conversion module 205 performs analog to digital conversion on the intermediate frequency amplified signal, and the analog to digital converted digital signal information passes through the memory module. 206 is buffered, and the digital processor module 207 is polarized, and the polarization digital processor module 207 performs polarization information extraction on the information buffered by the memory module 206, wherein the antenna module 201 can adopt a dual-polarized antenna for receiving left-handed rotation. Circularly polarized signals and right-handed circularly polarized signals are not described here.

It should be noted that when the vehicle speed is greater than a certain value, it is easy to cause the antenna of the vehicle-mounted radar device to resonate, that is, to form a resonance interference with the antenna of the vehicle-mounted radar device, thereby reducing polarization loss, resulting in deviation of the extracted polarization information, in order to solve the problem In the present invention, when the vehicle speed detecting trigger module 209 detects that the vehicle speed is greater than the first predetermined value, the first capacitor C1 is triggered to discharge, the base of the transistor VT is turned off, the collector potential is raised, and the first switch module is controlled. 211 is turned on, and the polarization control module 208 controls the antenna module 201 to perform polarization calibration. In specific implementation, the first predetermined value may determine a vehicle speed value that generates resonance interference according to different types of antenna tests, and no specific value is limited herein. In addition, the first switch module 211 in the present invention may be a device in which a thyristor or the like is triggered by a trigger signal to trigger its control electrode. In addition, as a specific embodiment, the vehicle speed detection trigger module 209 may include: a vehicle speed detector. a module and a switch control submodule, wherein the vehicle speed detecting submodule detects a vehicle of a vehicle in which the vehicle radar device is located The switch control submodule controls charging and discharging of the first capacitor according to a vehicle speed detected by the vehicle speed detecting submodule.

It should be noted that when the vehicle speed is less than a certain value, the influence of the resonance interference is small, that is, the polarization loss has no influence at all, and the polarization calibration needs to be turned off. In the present invention, when the vehicle speed is less than the second predetermined value, the vehicle speed detection trigger module 209 When the detected vehicle speed is less than the second predetermined value, the charging of the first capacitor is controlled to turn off the polarization calibration. However, although the vehicle speed has decreased, it is possible that the resonance interference will continue for a certain period of time, that is, the polarization needs to be maintained. The control module works for a period of time. For this reason, in the present invention, the control can be realized by the charging time of the first resistor R1 and the first capacitor C1, that is, when the output terminal voltage of the rectifier module charges the first capacitor C1 through the first resistor R1. When the voltage across the first capacitor C1 rises enough to turn the transistor VT back on, the gate of the thyristor as the first switching module is re-equally grounded, no trigger voltage, ie, the thyristor as the first switching module Turn off, the polarization control module no longer works, that is, the charging time is the working time of the polarization control module, in order to ensure that it can be realized at least once. The polarization calibration of the first resistor R1 and the first capacitor C1 in the present invention is: at least one of the polarization control modules controls an interval period for performing polarization calibration to ensure that the polarization control module can also Work at least one complete calibration cycle, so I won't go into details here.

In addition, referring to FIG. 4, when the local oscillator module 203 is activated, a large signal interference is formed on the local oscillator module 203 due to a sudden change of current in the circuit. To solve the problem, the present invention further includes a third resistor R3 and a fourth resistor. R4, the second capacitor C2, the first rectifier diode VD1, the second rectifier diode VD2, and the second switch module 212, taking the second switch module as a thyristor as an example, when the circuit of the local oscillator module is turned on, due to the characteristics of the capacitor The voltage across the second capacitor C2 cannot be abrupt, that is, the voltage across the second capacitor C2 is zero, and the thyristor as the second switch module 212 is turned off because there is no trigger voltage. Therefore, the current through the local oscillator module is passed through the second rectification. The half-wave current rectified by the diode VD2. At this time, the second capacitor C2 is charged by the first rectifier diode VD1 and the third resistor R3. After a certain delay, the voltage across the second capacitor C2 rises to the second switch module 212. The turn-on level of the thyristor is turned on as the thyristor of the second switch module 212, that is, the current gradually rises, the influence of the sudden change of the current is small, and the signal interference to the local oscillator module is reduced.

Claims

An intelligent vehicle-mounted radar device for reducing polarization loss, comprising: a transmitting unit that transmits a radar wave and a receiving unit that receives a radar wave transmitted from an external object, wherein

The receiving unit includes an antenna module, two microwave front end modules, a local oscillator module, two intermediate frequency amplifying modules, two analog to digital conversion modules, a memory module, a polarized digital processor module, a polarization control module, and a vehicle speed detection trigger. Module, rectifier module, transistor, first resistor, second resistor, first capacitor, first switch module;

The antenna module and the local oscillator module are both connected to two microwave front end modules, and the two microwave front end modules are respectively connected to two intermediate frequency amplifying modules, and the two intermediate frequency amplifying modules are respectively connected to two analog to digital conversion modules. The two analog-to-digital conversion modules are both connected to the memory module, the memory module is connected to the polarization digital processor module, the polarization control module is connected to the antenna module, and the vehicle speed detection trigger module and the first resistor a first capacitor and a base of the transistor are connected, a collector of the transistor is connected to the second resistor and the first switch module, and the first switch module is connected to the polarization control module through a rectifier module; After receiving the radar wave signal, the radar wave signal is selected by the corresponding microwave front end module, and is converted to the intermediate frequency by the intermediate frequency amplification module, and converted into a digital signal by the corresponding analog-to-digital conversion module, and the polarization digital processor module is passed through the memory module buffer. Polarization information is extracted from the information of the memory buffer, and the vehicle speed detection trigger module detects the vehicle Is greater than a first predetermined value, triggering the first capacitor discharges the base electrode of the transistor is off, the collector potential rises module further controls the first switch is turned on, the control module controls the polarization polarized antenna module calibration.
The device according to claim 1, wherein the vehicle speed detection triggering module comprises: a vehicle speed detecting sub-module and a switch control sub-module, wherein the vehicle speed detecting sub-module detects a vehicle speed of a vehicle in which the vehicle-mounted radar device is located, the switch control The submodule controls charging and discharging of the first capacitor according to a vehicle speed detected by the vehicle speed detecting submodule.
The apparatus according to claim 2, wherein the charging time of the first resistor and the first capacitor is: at least one of the polarization control modules controls an interval period during which polarization calibration is performed.
The apparatus of claim 1 wherein said antenna module employs a dual polarized antenna.
The apparatus of claim 1 wherein said first switching module is a thyristor.