Traffic road test radar transmitting and receiving circuit and method

Abstract

The invention discloses a traffic road test radar transmitting and receiving circuit which comprises a transmitting and receiving module, a basic radar module, a local oscillation source module and a power division driving module. The local oscillation source module is used for generating a local oscillation signal; the power division driving module is used for dividing a local oscillator signal into two signals with the same power; the basic radar module is a radar chip with the frequency range of 79-81 GHz; and the transceiver module is used for mixing the two paths of signals accessed to the sending information access port and then emitting the mixed signals, and carrying out difference frequency on the received radar signals and the output signals of the power division driving module accessed to the receiving information output port to obtain the input signals of the basic radar module. According to the 77-81GHz radar sensor, the final working frequency is improved by adding circuits on the basis of an existing 77-81GHz radar sensor, and the 77-81GHz radar sensor can work within the specified 92-96GHz frequency band quickly.

Description

Technical Field

[0001] The invention relates to the technical field of traffic road test radar, and in particular to a traffic road test radar transceiver circuit and method. Background Art

[0002] Nowadays, there are clear requirements for the frequency of traffic road test radar in China, which needs to be changed to 92-94GHz. However, the frequency of traffic road test radars produced in the current domestic field industry is 79-81GHz, and most of the 1T1R or 3T4R chips used by radars are from manufacturers such as TI and NXP, but these manufacturers are all foreign manufacturers, and the technology and relatively mature supporting software are relatively mature. It is necessary to move the frequency of traffic road test radar from 79-81GHz to 92-94GHz in a very short time, and the cost cannot be greatly increased. It is very difficult. The main reason is that it is difficult and time-consuming to independently develop 1T1R chips with a frequency of 92-94GHz, and the supporting software is immature, which makes it impossible to quickly realize the mass production of 92-94GHz frequency radars. At the same time, there may be a large volume of 1T1R modules developed with a frequency of 92-94GHz, which cannot meet the market's demand for size. At the same time, the existing stock of traffic road test radars with a frequency of 79-81GHz is large. If the traffic road test radars with a frequency of 92-94GHz are directly replaced, there will be a waste of resources. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a traffic road test radar transceiver circuit and method to solve the technical problem that the prior art cannot quickly implement and mass-produce traffic road test radars that can meet the 92-94GHz frequency.

[0004] The invention provides a traffic road measurement radar transceiver circuit, comprising: a transceiver module, a basic radar module, a local oscillator source module, and a power division driving module; the output end of the local oscillator source module is connected to the input end of the power division driving module; two output ends of the power division driving module are respectively connected to a receiving information output port and a sending information access port of the transceiver module; the output end of the basic module is connected to the sending information access port of the transceiver module, and the receiving end of the basic module is connected to the receiving information output port of the transceiver module; the local oscillator source module is used to generate a local oscillator signal; the power division driving module is used to divide the local oscillator signal into two signals with the same power; the basic radar module is a radar chip with a frequency range of 79-81GHz; the transceiver module is used to mix two signals connected to the sending information access port and then transmit them, and perform frequency difference between the received radar signal and the output signal of the power division driving module connected to the receiving information output port to obtain the input signal of the basic radar module.

[0005] Furthermore, the local oscillator source module includes: a voltage-controlled oscillator and a phase-locked loop; the frequency of the local oscillator signal generated by the voltage-controlled oscillator is locked by the phase-locked loop.

[0006] Furthermore, the power division driving module includes: a one-to-two power divider and two driving amplifiers; the output end of the local oscillator source module is connected to the input end of the one-to-two power divider, and the two output ends of the one-to-two power divider are respectively connected to the two driving amplifiers; the output ends of the two driving amplifiers are respectively used as the two output ends of the power division driving module.

[0007] Furthermore, the transceiver module includes: a receiving antenna, a transmitting antenna, a power amplifier, a low-noise amplifier and two mixers; an output end of the power division driving module is connected to an input end of the first mixer, the output end of the basic radar module is connected to another input end of the first mixer, the output end of the first mixer is connected to the input end of the power amplifier, and the output end of the power amplifier is connected to the transmitting antenna; the receiving antenna is connected to the input end of the low-noise amplifier, the output end of the low-noise amplifier is connected to an input end of the second mixer, the other output end of the power division driving module is connected to another input end of the second mixer, and the output end of the second mixer is connected to the input end of the basic radar module.

[0008] The present invention also provides a traffic road test radar transceiver method, which is applicable to the above-mentioned traffic road test radar transceiver circuit, and the method comprises:

[0009] Determine the operating frequency range of each traffic road test radar in the same group within the frequency range of 92-94GHz. Set the local oscillator signal frequency required to be generated by the local oscillator source module according to the upper and lower limits of the operating frequency range required by the traffic road test radar and the frequency range of the basic radar module used. Generate the corresponding local oscillator signal through the local oscillator source module. When it is necessary to transmit a radar signal, mix the local oscillator signal with the output signal of the basic radar module to form a radar signal. When it is necessary to receive a radar signal, the received radar signal is compared with the local oscillator signal to form the signal required by the basic radar module.

[0010] Beneficial effects of the present invention:

[0011] The present invention improves the final operating frequency by adding circuits on the basis of the existing 77-81GHz radar sensor, and can quickly realize the 77-81GHz radar sensor to work in the specified 92-96GHz frequency band. The operating frequency that the present invention needs to achieve is achieved on the basis of the existing radar chip, temporarily skipping the chip research and development process, which can greatly reduce the research and development cost, does not affect the current radar back-end processing, and effectively avoids the waste of existing resources. The present invention adjusts the local oscillator signal frequency used by each traffic road test radar in a group according to the required working frequency range, and sets different local oscillator signal frequencies between each traffic road test radar, which can simply and effectively avoid the situation where the radar works in the same frequency band and there is co-frequency interference. The present invention can increase the transmission power and receiving gain according to the actual use scenario, so that the radar detection distance is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0013] Figure 1 Schematic diagram of a circuit of a specific embodiment of the present invention. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0015] The present invention is further illustrated below in conjunction with specific embodiments. Those skilled in the art should understand that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention, and modifications to various equivalent forms of the present invention fall within the scope defined by the appended claims of this application.

[0016] like Figure 1 As shown, the present invention provides a traffic road test radar transceiver circuit, including: a transceiver module 1, a basic radar module 2, a local oscillator source module 3, and a power division drive module 4;

[0017] The local oscillator module 3 includes: a voltage-controlled oscillator VCO and a phase-locked loop PLL; the power division driving module 4 includes: a one-to-two power divider P1 and two driving amplifiers U1 and U2; the transceiver module 1 includes: a receiving antenna RX, a transmitting antenna TX, a power amplifier U3, a low-noise amplifier U4 and two mixers M1 and M2; the basic radar module 3 is a radar chip with a frequency range of 79-81GHz;

[0018] The frequency of the local oscillator signal generated by the voltage-controlled oscillator VCO is locked by the phase-locked loop PLL. The selection of the frequency of the local oscillator signal is determined based on the operating frequency range of the basic radar module 3 within the range of 79-81GHz and the operating frequency range within the range of 92-96GHz, which is the difference between the two. The output end of the voltage-controlled oscillator VCO is connected to the input end of the one-to-two power divider P1. The two output ends of the one-to-two power divider P1 are respectively connected to two driving amplifiers U1 and U2. The two driving amplifiers U1 and U2 can ensure that the W-band mixer can be driven to work normally. In order to ensure the consistency of the system phase, the two power division signal transmission lines must be of equal length. The output end of the driving amplifier U1 is connected to an input end of the mixer M1, the output end of the basic radar module 3 is connected to the other input end of the mixer M1, the output end of the mixer M1 is connected to the input end of the power amplifier U3, and the output end of the power amplifier U3 is connected to the transmitting antenna TX; the transmission process realizes the function of up-converting 77-81GHz to 92-96GHz frequency band, the radar chip outputs a frequency of 77-81GHz, enters the mixer M1, and mixes with the local oscillator signal to 92.5-96.5GHz, and the transmission power is increased by the power amplifier U1 and provided to the reflective antenna TX for transmission; The receiving antenna RX is connected to the input end of the low noise amplifier U4, the output end of the low noise amplifier U4 is connected to one input end of the mixer M2, the output end of the driving amplifier U2 is connected to the other input end of the mixer M2, and the output end of the mixer M2 is connected to the input end of the basic radar module 3; the receiving process realizes the function of down-converting from 92-96GHz to 77-81GHz frequency band. After the receiving antenna RX receives the returned signal, the received signal is amplified by the low noise amplifier U4, and then input into the mixer M2 to mix with the local oscillator signal, down-mixed to 77-81GHz, and then enters the radar chip for signal processing.

[0019] The present invention also provides a traffic road test radar transceiver method, which is applicable to the above-mentioned traffic road test radar transceiver circuit, and the method comprises:

[0020] Determine the operating frequency range of each traffic road test radar in the same group within the frequency range of 92-94GHz. Set the local oscillator signal frequency required to be generated by the local oscillator source module according to the upper and lower limits of the operating frequency range required by the traffic road test radar and the frequency range of the basic radar module used. Generate the corresponding local oscillator signal through the local oscillator source module. When it is necessary to transmit a radar signal, mix the local oscillator signal with the output signal of the basic radar module to form a radar signal. When it is necessary to receive a radar signal, the received radar signal is compared with the local oscillator signal to form the signal required by the basic radar module.

[0021] The circuit and method of the present invention are described below by way of examples, as follows:

[0022] In general scenarios, there will be two road test radars for comparison. If the radars work in the same frequency band, there will be co-channel interference, which will cause single or multiple false targets to appear in the radar image. For example, the first radar works in a frequency band of 77-78 GHz, and the local oscillator is set to 15 GHz. After being processed by the present invention, the final transmission frequency is 92-93 GHz. The second radar works in the same frequency band as the first radar, which is also 77-78 GHz, and the local oscillator is set to 16 GHz. After being processed by the present invention, the final system transmission frequency is 93-94 GHz. There are few crossover frequencies between 92-93 GHz and 93-94 GHz, which greatly reduces the problem of co-channel interference and also meets the requirement of increasing the frequency range of 92-94 GHz.

[0023] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A traffic road test radar transceiver circuit, characterized in that: include: Transceiver module, basic radar module, local oscillator module, power division drive module; The output end of the local oscillator source module is connected to the input end of the power division driving module; The two output ends of the power division driving module are respectively connected to the receiving information output port and the sending information access port of the transceiver module; the output end of the basic module is connected to the sending information access port of the transceiver module, and the receiving end of the basic module is connected to the receiving information output port of the transceiver module; The local oscillator source module is used to generate a local oscillator signal; the power division drive module is used to divide the local oscillator signal into two signals with the same power; the basic radar module is a radar chip with a frequency range of 79-81GHz; the transceiver module is used to mix the two signals connected to the information sending access port and then transmit them, and to perform a difference frequency calculation on the received radar signal and the output signal of the power division drive module connected to the information receiving output port to obtain the input signal of the basic radar module.

2. The traffic road test radar transceiver circuit as claimed in claim 1, characterized in that: The local oscillator source module includes: a voltage-controlled oscillator and a phase-locked loop; the frequency of the local oscillator signal generated by the voltage-controlled oscillator is locked by the phase-locked loop.

3. The traffic road test radar transceiver circuit as claimed in claim 1, characterized in that: The power division driving module includes: a one-to-two power divider and two driving amplifiers; the output end of the local oscillator source module is connected to the input end of the one-to-two power divider, and the two output ends of the one-to-two power divider are respectively connected to the two driving amplifiers; the output ends of the two driving amplifiers are respectively used as the two output ends of the power division driving module.

4. The traffic road test radar transceiver circuit as claimed in claim 1, characterized in that: The transceiver module includes: a receiving antenna, a transmitting antenna, a power amplifier, a low noise amplifier and two mixers; an output end of the power division driving module is connected to an input end of the first mixer, the output end of the basic radar module is connected to another input end of the first mixer, the output end of the first mixer is connected to the input end of the power amplifier, and the output end of the power amplifier is connected to the transmitting antenna; the receiving antenna is connected to the input end of the low noise amplifier, the output end of the low noise amplifier is connected to an input end of the second mixer, the other output end of the power division driving module is connected to another input end of the second mixer, and the output end of the second mixer is connected to the input end of the basic radar module.

5. A traffic road test radar transceiver method, applicable to the traffic road test radar transceiver circuit as claimed in any one of claims 1 to 4, characterized in that: The method comprises: Determine the operating frequency range of each traffic road test radar in the same group within the frequency range of 92-94GHz. Set the local oscillator signal frequency required to be generated by the local oscillator source module according to the upper and lower limits of the operating frequency range required by the traffic road test radar and the frequency range of the basic radar module used. Generate the corresponding local oscillator signal through the local oscillator source module. When it is necessary to transmit a radar signal, mix the local oscillator signal with the output signal of the basic radar module to form a radar signal. When it is necessary to receive a radar signal, the received radar signal is compared with the local oscillator signal to form the signal required by the basic radar module.

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