An intelligent vehicle-mounted radar device for reducing signal interference

Abstract

The present invention discloses an intelligent vehicle-mounted radar device for reducing signal interference. The antenna module of the intelligent vehicle-mounted radar device can adopt a dual-polarized antenna, that is, it can measure signals of any polarization, and the polarization information can be processed and extracted in real time through a polarization digital processor module, which has the characteristics of fast and real-time. In addition, when the local oscillator module is turned on, the current passing through the local oscillator module is gradually increased through the first rectifier diode, the first switch module, the first resistor, the second resistor, and the second sorting diode to suppress signal interference, thereby improving the performance of the intelligent vehicle-mounted radar device.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted radars, and more particularly to an intelligent vehicle-mounted radar device for reducing signal interference. Background Art

[0002] With the development of Internet of Vehicles technology, the application space of vehicle-mounted radar technology is getting larger and larger. For example, there are many vehicles on the highway and various accidents often occur. The vehicle-mounted radar device can measure and display the distance of external obstacles from the car. The detection is fast and convenient, the calculation is simple, and it is easy to control in real time. However, how to better improve the performance of intelligent vehicle-mounted radar devices is a problem faced by the industry. Summary of the invention

[0003] In view of the above problems, an embodiment of the present invention provides 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 intelligent vehicle-mounted radar device.

[0004] In order to solve the above technical problems, this application adopts the following technical solutions:

[0005] An intelligent vehicle-mounted radar device for reducing signal interference according to an embodiment of the present invention includes: a transmitting unit for transmitting radar waves and a receiving unit for receiving radar waves emitted from an external object.

[0006] The receiving unit includes an antenna module, two microwave front-end modules, a local oscillator module, two intermediate frequency amplification modules, two analog-to-digital conversion modules, a memory module, a polarization digital processor module, a polarization control module, a first resistor, a second resistor, a first capacitor, a first rectifier diode, a second rectifier diode and a first switch module.

[0007] The antenna module and the local oscillator module are both connected to two microwave front-end modules, the two microwave front-end modules are respectively connected to two intermediate frequency amplification modules, the two intermediate frequency amplification modules are respectively connected to two analog-to-digital conversion modules, the two analog-to-digital conversion modules are both connected to a memory module, the memory module is connected to a polarization digital processor module, the polarization control module is connected to the antenna module, the local oscillator module is respectively connected to the first rectifier diode, the first switch module and the second rectifier diode, the first resistor is respectively connected to the first rectifier diode, the second resistor, the first capacitor and the first switch module, one end of the first capacitor is respectively connected to the first resistor, the first switch module and the second rectifier diode. The first end of the local oscillator module is connected to the switch module and the second resistor, and the other end is respectively connected to 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 and then selected by the corresponding microwave front-end module, 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 cached by the memory module. The polarization digital processor module extracts polarization information from the information cached in the memory. When the local oscillator module is turned on, the current passing through the local oscillator module is gradually increased through the first rectifier diode, the first switch module, the first resistor, the second resistor, and the second rectifier diode to suppress signal interference.

[0008] According to an intelligent vehicle-mounted radar device of an embodiment of the present invention, its antenna module can adopt a dual-polarized antenna, that is, it can measure signals of any polarization, and process and extract polarization information in real time through a polarization digital processor module, which has the characteristics of fast and real-time. In addition, when the local oscillator module is turned on, the current passing through the local oscillator module is gradually increased through the first rectifier diode, the first switch module, the first resistor, the second resistor, and the second rectifier diode to suppress signal interference, thereby improving the performance of the intelligent vehicle-mounted radar device. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the composition of an intelligent vehicle-mounted radar device of the present invention;

[0010] Figure 2 It is a block diagram of a receiving unit in an intelligent vehicle-mounted radar device of the present invention;

[0011] Figure 3 It is a schematic diagram of controlling a polarization control module to perform polarization calibration in an intelligent vehicle-mounted radar device of the present invention;

[0012] Figure 4 It 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 DESCRIPTION

[0013] refer to Figure 1 , a schematic diagram of the composition of an intelligent vehicle-mounted radar device according to an embodiment of the present invention, which comprises: a transmitting unit 1 for transmitting radar waves and a receiving unit 2 for receiving radar waves emitted from an external object, with reference to Figure 2 In order to extract polarization information, as a specific embodiment, the receiving unit 2 includes an antenna module 201, two microwave front-end modules 202, a local oscillator module 203, two intermediate frequency amplification modules 204, two analog-to-digital conversion modules 205, a memory module 206, a polarization digital processor module 207, and a polarization control module 208. In addition, refer to Figure 3 As one aspect of the present invention, in order to achieve the control of polarization interference, the vehicle-mounted radar device of the present invention also includes a vehicle speed detection trigger module 209, a rectifier module 210, a second switch module 211, a transistor VT, a third resistor R1, a fourth resistor R2, and a second capacitor C2.

[0014] In a specific implementation, the antenna module 201 and the local oscillator module 203 are both connected to two microwave front-end modules 202, the two microwave front-end modules 202 are respectively connected to two intermediate frequency amplification modules 204, the two intermediate frequency amplification modules 204 are respectively connected to two analog-to-digital conversion modules 205, the two analog-to-digital conversion modules 205 are both connected to a memory module 206, the memory module 206 is connected to a polarization digital processor module 207, the polarization control module 208 is connected to the antenna module 201, and the vehicle speed detection trigger module 209 is connected to the third resistor R3, the second capacitor C2 and the base of the transistor VT, the collector of the transistor VT is connected to the fourth resistor R2 and the second switch module 211, and the second switch module 211 is connected to the polarization control module 208 through the rectifier module 210.

[0015] During specific operation, the antenna module 201 is used to receive radar wave signals emitted from external objects, the microwave front-end module 202 is used to select the signal received by the antenna module 201 and mix it with the local oscillator signal transmitted by the local oscillator module 203 into an intermediate frequency signal, the intermediate frequency amplification module 204 performs intermediate frequency amplification on the signal sent by 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 into a digital signal, the digital signal information after the analog-to-digital conversion is cached by the memory module 206, and the polarization digital processor module 207, and the polarization digital processor module 207 extracts polarization information from the information cached in the memory module 206, wherein the antenna module 201 can adopt a dual-polarization antenna for receiving left-hand circularly polarized signals and right-hand circularly polarized signals, which will not be repeated here.

[0016] 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 resonant interference on the antenna of the vehicle-mounted radar device, thereby reducing the polarization loss and causing the extracted polarization information to deviate. In order to solve this problem, in the present invention, when the vehicle speed detection trigger module 209 detects that the vehicle speed is greater than the first predetermined value, the second capacitor C2 is triggered to discharge so that the base of the transistor VT is cut off and the collector potential rises, thereby controlling the second switch module 211 to turn on, and the polarization control module 208 controls the antenna module 201 to perform polarization calibration. In specific implementation, the first A predetermined value can be determined based on different types of antenna tests to determine the vehicle speed value that produces resonance interference. The specific value is not limited here. In addition, the second switch module 211 in the present invention can use a thyristor or other device that is turned on by triggering its control electrode with a trigger signal. In addition, as a specific embodiment, the vehicle speed detection trigger module 209 may include: a vehicle speed detection submodule and a switch control submodule. The vehicle speed detection submodule detects the speed of the vehicle where the vehicle-mounted radar device is located, and the switch control submodule controls the charging and discharging of the second capacitor C2 according to the vehicle speed detected by the vehicle speed detection submodule.

[0017] It should be noted that when the vehicle speed is less than a certain value, the resonance interference has little effect, that is, the polarization loss has basically no effect, and the polarization calibration needs to be turned off. In the present invention, when the vehicle speed is less than the second predetermined value, that is, when the vehicle speed detection trigger module 209 detects that the vehicle speed is less than the second predetermined value, the charging of the second capacitor is controlled to turn off the polarization calibration. However, in specific implementation, although the vehicle speed has been reduced, it is possible that the resonance interference will continue for a certain period of time, that is, it is necessary to keep the polarization control module working for a period of time. For this reason, the present invention can be controlled by the third resistor R3 and the charging time of the second capacitor C2, that is, when the output terminal voltage of the rectifier module is connected to the second capacitor C2 through the third resistor R3, When the voltage across the second capacitor C2 rises to a level sufficient to turn the crystal triode VT back on, the control electrode of the thyristor serving as the second switch module is equivalently grounded again, and there is no trigger voltage, that is, the thyristor serving as the second switch module is turned off, and 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 can be achieved, 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 the interval period for performing polarization calibration to ensure that the polarization control module can also work for at least one complete calibration cycle, which will not be described in detail here.

[0018] In addition, refer to Figure 4As another aspect of the present invention, when the local oscillator module 203 is started, the sudden change of current in the circuit will cause a large signal interference to the local oscillator module 203. In order to solve this problem, the present invention also includes a first resistor R1, a second resistor R2, a first capacitor C2, a first rectifier diode VD1, a second rectifier diode VD2 and a first switch module 212. Taking the first switch module as a thyristor as an example, when the circuit where the local oscillator module is located is connected, due to the characteristics of the capacitor, the voltage across the first capacitor C1 cannot suddenly change, that is, the voltage across the first capacitor C1 cannot suddenly change. The voltage is zero, and the thyristor of the first switch module 212 is cut off because there is no trigger voltage. Therefore, the current passing through the local oscillator module is a half-wave current rectified by the second rectifier diode VD2. At this time, the first capacitor C1 is charged through the first rectifier diode VD1 and the first resistor R1. After a certain delay, the voltage across the first capacitor C1 rises to the turn-on level of the thyristor of the second switch module 212, and the thyristor of the first switch module 212 is turned on, that is, the current gradually rises, and the impact of the current mutation is small, thereby reducing the signal interference to the local oscillator module.

Claims

1. An intelligent vehicle-mounted radar device for reducing signal interference, characterized in that: include: a transmitting unit for transmitting radar waves and a receiving unit for receiving radar waves emitted from an external object, wherein The receiving unit includes an antenna module, two microwave front-end modules, a local oscillator module, two intermediate frequency amplification modules, two analog-to-digital conversion modules, a memory module, a polarization digital processor module, a polarization control module, a first resistor, a second resistor, a first capacitor, a first rectifier diode, a second rectifier diode and a first switch module; The antenna module and the local oscillator module are both connected to two microwave front-end modules, the two microwave front-end modules are respectively connected to two intermediate frequency amplification modules, the two intermediate frequency amplification modules are respectively connected to two analog-to-digital conversion modules, the two analog-to-digital conversion modules are both connected to a memory module, the memory module is connected to a polarization digital processor module, the polarization control module is connected to the antenna module, the local oscillator module is respectively connected to the first rectifier diode, the first switch module and the second rectifier diode, the first resistor is respectively connected to the first rectifier diode, the second resistor, the first capacitor and the first switch module, one end of the first capacitor is respectively connected to the first resistor, the first switch module and the second rectifier diode. The first end of the local oscillator module is connected to the switch module and the second resistor, and the other end is respectively connected to 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 and then selected by the corresponding microwave front-end module, 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 cached by the memory module. The polarization digital processor module extracts polarization information from the information cached in the memory. When the local oscillator module is turned on, the current passing through the local oscillator module is gradually increased through the first rectifier diode, the first switch module, the first resistor, the second resistor, and the second rectifier diode to suppress signal interference.

2. The device according to claim 1, characterized in that Also includes: A vehicle speed detection trigger module, a rectifier module, a transistor, a third resistor, a fourth resistor, a second capacitor, and a second switch module. The vehicle speed detection trigger module is 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. The second switch module is connected to the polarization control module through the rectifier module. When the vehicle speed detection trigger module detects that the vehicle speed is greater than a first predetermined value, the second capacitor is triggered to discharge so that the base of the transistor is cut off and the collector potential rises, thereby controlling the second switch module to be turned on. The polarization control module controls the antenna module to perform polarization calibration.

3. The device according to claim 2, characterized in that The vehicle speed detection trigger module includes: a vehicle speed detection submodule and a switch control submodule. The vehicle speed detection submodule detects the speed of the vehicle where the vehicle-mounted radar device is located, and the switch control submodule controls the charging and discharging of the second capacitor according to the vehicle speed detected by the vehicle speed detection submodule.

4. The device according to claim 3, characterized in that The charging time of the third resistor and the second capacitor is: the interval period during which at least one of the polarization control modules controls the polarization calibration.

5. The device according to claim 2, characterized in that The first switch module and the second switch module are both thyristors.

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