WO2019127181A1

WO2019127181A1 - Intelligent vehicle-mounted radar device for reducing signal interference

Info

Publication number: WO2019127181A1
Application number: PCT/CN2017/119241
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 is an intelligent vehicle-mounted radar device for reducing signal interference. An antenna module thereof may be a bipolar antenna, that is, any polarized signal can be measured, and a digital polarization processor module processes and extracts polarization information in real time, thus having the characteristics of rapidity and timeliness. In addition, when a local oscillation module is turned on, a first rectifier diode, a first switch module, a first resistor, a second resistor and a second rectifier diode enable a current passing through the local oscillation module rise gradually to suppress signal interference, thereby improving the performance of the intelligent vehicle-mounted radar device.

Description

Intelligent vehicle-mounted radar device for reducing signal interference

Technical field

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

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 signal interference to the local oscillator module, thereby improving the performance of the smart vehicle 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 signal interference 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 first resistor. a second resistor, a first capacitor, a first rectifier diode, a second rectifier diode, and a first switching 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 all 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 local oscillator module and the first rectification respectively a diode, the first switch module and the second rectifier diode are connected, the first resistor is respectively connected to the first rectifier diode, the second resistor, the first capacitor and the first switch module, the first capacitor One end is respectively connected to the first resistor, the first switch module and the second resistor, and the other end is respectively connected with the second resistor and the other end of the first switch module and one end of the second rectifier diode; the received radar wave signal is received by the antenna module The antenna signal is selected through the corresponding microwave front-end module, and is converted to the intermediate frequency by the intermediate frequency amplification module, and the corresponding analog-to-digital conversion module Transmitting into a digital signal, the polarization digital processor module extracts polarization information of the memory buffer by the memory module buffer, and passes through the first rectifier diode and the first switch module when the local oscillator module is turned on The first resistor, the second resistor, and the second trimming diode gradually increase a current through the local oscillator module to suppress signal interference.

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 a real-time feature, in addition, when the local oscillator module is turned on, passing through the first rectifier diode, the first switch module, the first resistor, the second resistor, and the second trimming diode The current of the local oscillator module is gradually increased to suppress signal interference, thereby improving the performance of the smart 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;

4 is a schematic diagram of preventing signal interference in a local oscillator module in an intelligent vehicle-mounted radar device 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, as one aspect of the present invention, 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, the rectifier module 210, the second switch module 211, the transistor VT, the third resistor R1, the fourth resistor R2, the second capacitor C2;

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, and the vehicle speed detecting trigger module 209 is connected to the bases of the third resistor R3, the second capacitor C2 and the transistor VT, and the collector of the transistor VT and the fourth resistor R2 and The second switch module 211 is connected, and the second switch module 211 is connected to the polarization control module 208 through the rectifier 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 second capacitor C2 is triggered to discharge, the base of the transistor VT is turned off, the collector potential is raised, and the second 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 second 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 second capacitor C2 according to the 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 second 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 third resistor R3 and the second capacitor C2, that is, when the output terminal voltage of the rectifier module charges the second capacitor C2 through the third resistor R3. When the voltage across the second capacitor C2 rises enough to turn the transistor VT back on, the gate of the thyristor as the second switching module is re-equally grounded, and there is no trigger voltage, ie, the thyristor as the second switching module. Turn off, the polarization control module no longer works, that is, the charging time of the second capacitor C2 is the working time of the polarization control module, in order to ensure that At least one complete polarization calibration, the charging time of the third resistor R3 and the second capacitor C2 in the present invention is: at least one of the polarization control modules controls an interval period for performing polarization calibration to ensure polarization control The module can also work for at least one complete calibration cycle, which is not repeated here.

In addition, referring to FIG. 4, as another aspect of the present invention, when the local oscillator module 203 is activated, a large signal interference is generated to the local oscillator module 203 due to a sudden change in current in the circuit. To solve the problem, the present invention also includes The first resistor R1, the second resistor R2, the first capacitor C2, the first rectifier diode VD1, the second rectifier diode VD2, and the first switch module 212, taking the first switch module as a thyristor as an example, when the local oscillator module is located When turned on, due to the characteristics of the capacitor, the voltage across the first capacitor C1 cannot be abrupt, that is, the voltage across the first capacitor C1 is zero, and the thyristor as the first switching module 212 is turned off because there is no trigger voltage, so the local oscillator is passed. The current of the module is a half-wave current rectified by the second rectifier diode VD2. At this time, the first capacitor C1 is charged by the first rectifier diode VD1 and the first resistor R1, and after a certain time delay, the voltage across the first capacitor C1 rises. To the turn-on level of the thyristor as the second switch module 212, the thyristor as the first switch module 212 is turned on, that is, the current gradually rises, and the current sudden change is less, and the current is reduced. Local oscillation signal interference module.

Claims

An intelligent vehicle-mounted radar device for reducing signal interference, 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 first resistor. a second resistor, a first capacitor, a first rectifier diode, a second rectifier diode, and a first switching 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 all 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 local oscillator module and the first rectification respectively a diode, the first switch module and the second rectifier diode are connected, the first resistor is respectively connected to the first rectifier diode, the second resistor, the first capacitor and the first switch module, the first capacitor One end is respectively connected to the first resistor, the first switch module and the second resistor, and the other end is respectively connected with the second resistor and the other end of the first switch module and one end of the second rectifier diode; the received radar wave signal is received by the antenna module The antenna signal is selected through the corresponding microwave front-end module, and is converted to the intermediate frequency by the intermediate frequency amplification module, and the corresponding analog-to-digital conversion module For the digital signal, the polarization digital processor module extracts the information of the memory buffer through the memory module buffer, and when the local oscillator module is turned on, passes through the first rectifier diode, the first switch module, The first resistor, the second resistor, and the second trimming diode gradually increase a current through the local oscillator module to suppress signal interference.
The device according to claim 1, further comprising: a vehicle speed detecting trigger module, a rectifier module, a transistor, a third resistor, a fourth resistor, a second capacitor, and a second switch module, wherein the vehicle speed detecting trigger module Connected to the third resistor, the second capacitor, and the base of the transistor, the collector of the transistor is connected to the fourth resistor and the second switch module, and the second switch module passes through the rectifier module The polarization control module is connected. When the vehicle speed detection triggering module detects that the vehicle speed is greater than the first predetermined value, triggering the second capacitor discharge to turn off the base of the transistor and increase the collector potential to control the second switch module to be turned on. The polarization control module controls the antenna module for polarization calibration.
The device according to claim 2, 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 of claim 3 wherein the charging time of said third resistor and said second capacitor is such that at least one of said polarization control modules controls an interval period during which polarization calibration is performed.
The device according to claim 2, wherein the first switch module and the second switch module are both thyristors.