CN219225089U - Ultrasonic echo signal processing circuit, chip and automobile radar device - Google Patents
Ultrasonic echo signal processing circuit, chip and automobile radar device Download PDFInfo
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- CN219225089U CN219225089U CN202223609598.3U CN202223609598U CN219225089U CN 219225089 U CN219225089 U CN 219225089U CN 202223609598 U CN202223609598 U CN 202223609598U CN 219225089 U CN219225089 U CN 219225089U
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Abstract
The utility model discloses an ultrasonic echo signal processing circuit, a chip and an automobile radar device, and relates to the technical field of radar devices. The ultrasonic echo signal processing circuit is used for being electrically connected with an ultrasonic transducer, the ultrasonic transducer comprises an ultrasonic receiving device, the ultrasonic echo signal processing circuit comprises a sampling unit, a threshold comparison unit and a main control circuit unit, a first input end of the sampling unit is electrically connected with an output end of the ultrasonic receiving device, and the sampling unit receives echo signals acquired by the ultrasonic receiving device and converts the echo signals into first signals; the input end of the threshold comparison unit is electrically connected with the output end of the sampling unit, and the threshold comparison unit receives the first signal to perform threshold comparison and outputs a threshold comparison result; the input end of the main control circuit unit is electrically connected with the output end of the threshold comparison unit, and the main control circuit unit receives the threshold comparison result and judges whether the echo signal is reflected by an obstacle or not according to the threshold comparison result.
Description
Technical Field
The present utility model relates to the field of radar devices, and in particular, to an ultrasonic echo signal processing circuit, a chip, and an automotive radar device.
Background
In the existing ultrasonic echo detection, a signal processing unit processes echo signals, all processed echo signals or an envelope curve of a peak value is sent to a main control circuit after the peak value is extracted, the main control circuit compares the echo signals sent back by the signal processing unit with a threshold value, and the distance of an obstacle is judged according to a comparison result.
In the existing mode, all echo signals are processed by an ADC, the processed data are stored in a buffer, the data in the buffer are extracted by a DSP circuit to be processed, and finally the processed result is used for judging the distance of an obstacle. Thus, more or larger buffers are needed to buffer the data processed by the ADC, or the DSP circuit processes the data, and the processing speed is slow, a large amount of hardware circuits are needed, and the power consumption for processing a large amount of data is high.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model aims to provide an ultrasonic echo signal processing circuit, a chip and an automobile radar device, which solve the problems that the processing speed is low, a large amount of hardware circuits are required to be occupied, and the power consumption for processing a large amount of data is high in the prior art.
According to a first aspect of the present utility model, there is provided an ultrasonic echo signal processing circuit for electrical connection with an ultrasonic transducer, the ultrasonic transducer comprising an ultrasonic receiving device, comprising:
the first input end of the sampling unit is electrically connected with the output end of the ultrasonic receiving device, and the sampling unit receives the echo signal output by the ultrasonic receiving device and converts the echo signal into a first signal;
the input end of the threshold comparison unit is electrically connected with the output end of the sampling unit, and the threshold comparison unit receives the first signal to perform threshold comparison and outputs a threshold comparison result;
the input end of the main control circuit unit is electrically connected with the output end of the threshold comparison unit, and the main control circuit unit receives the threshold comparison result and judges whether the echo signal is reflected by the obstacle or not according to the threshold comparison result.
According to the ultrasonic echo signal processing circuit, the echo signal is converted into the first signal through the sampling unit, and the threshold comparison unit compares the first signal with the preset threshold, so that the main control circuit unit judges whether the echo signal is reflected by an obstacle or not according to the threshold comparison result, a large number of buffers are saved, hardware cost and power consumption are reduced, meanwhile, the judging speed of echo occurrence is improved, and the detection precision is improved.
In some embodiments, the threshold comparing unit is configured to compare the received first signal with a preset threshold value, and output a second signal when the first signal is greater than the preset threshold value;
and when the received second signals continuously appear in a preset quantity or periodically and continuously appear in a preset quantity within a certain time, the main control circuit unit judges that the echo signals are echo signals reflected by the obstacle.
In some embodiments, the ultrasonic transducer further comprises a driving circuit, wherein the ultrasonic transducer comprises an ultrasonic transmitting device, and the input end and the output end of the driving circuit are respectively and electrically connected with the first output end of the main control circuit unit and the input end of the ultrasonic transmitting device;
the driving circuit is controlled by the main control circuit unit to generate an ultrasonic driving signal to drive the ultrasonic transmitting device.
In some embodiments, the second output of the master circuit unit is electrically connected with the second input of the sampling unit;
when the main control circuit unit judges that the echo signal is reflected by the obstacle, the sampling unit is closed before the next control of the driving circuit generates an ultrasonic driving signal. Thus, the power consumption of the circuit can be reduced.
In some embodiments, the device further comprises a register electrically connected between the output of the sampling unit and the input of the threshold comparison unit;
the register receives the first signals and inputs the first signals into different addresses bit by bit according to the sequence;
the register sequentially transmits the first signals input into different addresses bit by bit to the threshold comparison unit for threshold comparison. Thus, the accuracy and the comparison speed can be improved.
In some embodiments, at least two threshold comparison units are provided, the input ends of different threshold comparison units are respectively and electrically connected with different output ends of the register, and the output ends of different threshold comparison units are respectively and electrically connected with different input ends of the main control circuit unit;
the different threshold comparison units are used for simultaneously processing different first signals. Thereby, the processing speed can be increased.
In some embodiments, the capacity of the register is set according to the ratio of the operating efficiencies of the sampling unit and the threshold comparison unit, so that the sampling frequency of the sampling unit is kept consistent with the operating frequency of the threshold comparison unit.
In some embodiments, the ultrasonic sensor further comprises an amplifying unit/filtering unit, wherein the first input end and the output end of the amplifying unit/filtering unit are respectively and electrically connected with the output end of the ultrasonic receiving device and the first input end of the sampling unit, or respectively and electrically connected with the output end of the sampling unit and the input end of the threshold value comparing unit;
the amplifying unit/filtering unit is used for amplifying/filtering the echo signal or the first signal.
In some embodiments, the system further comprises an echo intensity adjusting module, wherein the input end and the output end of the echo intensity adjusting module are respectively and electrically connected with the third output end of the main control circuit unit and the second input end of the amplifying unit;
the echo intensity adjusting module is controlled by the main control circuit unit to adjust the amplification factor of the echo signal or the first signal by the amplifying unit.
According to a second aspect of the present utility model, there is provided a chip comprising the above-described ultrasonic echo signal processing circuit.
According to a third aspect of the present utility model, there is provided an automotive radar apparatus including an ultrasonic wave transmitting apparatus, an ultrasonic wave receiving apparatus, and the chip described above.
Compared with the prior art, the ultrasonic echo signal processing circuit, the ultrasonic echo signal processing chip and the automobile radar device convert the echo signal into the first signal through the sampling unit, and the threshold comparison unit compares the first signal with the preset threshold, so that the main control circuit unit judges whether the echo signal is reflected by an obstacle or not according to the threshold comparison result, a large number of buffers are saved, hardware cost and power consumption are reduced, meanwhile, the judging speed of echo occurrence is improved, and the detection precision is improved.
Drawings
Fig. 1 is a schematic diagram showing the module composition of an ultrasonic echo signal processing circuit according to a first embodiment of the present utility model;
FIG. 2 is a schematic diagram illustrating the module composition of a sampling unit and a threshold comparison unit according to a first embodiment of the present utility model;
FIG. 3 is a schematic circuit diagram of an ultrasonic echo signal processing circuit according to a second embodiment of the present utility model;
fig. 4 is a schematic circuit diagram of an ultrasonic echo signal processing circuit according to a third embodiment of the present utility model;
fig. 5 is a schematic circuit diagram of an ultrasonic echo signal processing circuit according to a fourth embodiment of the present utility model;
fig. 6 is a schematic block diagram of an automotive radar apparatus according to an embodiment of the present utility model.
Reference numerals illustrate: the device comprises a processing circuit 100, a driving circuit 110, a sampling unit 120, a threshold comparison unit 130, a main control circuit unit 140, a register 150, an amplifying unit/filtering unit 160, an echo intensity adjusting module 170, an ultrasonic transducer 200, an ultrasonic transmitting device 210, an ultrasonic receiving device 220 and a host computer 300.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings.
According to a first aspect of the present utility model, fig. 1 schematically shows an ultrasonic echo signal processing circuit according to a first embodiment of the present utility model. As shown in fig. 1, the processing circuit 100 is configured to be electrically connected to an ultrasonic transducer 200, where the ultrasonic transducer 200 includes an ultrasonic transmitting device 210 and an ultrasonic receiving device 220, the ultrasonic transmitting device 210 is configured to transmit ultrasonic waves for detection (such as distance detection of an obstacle), the ultrasonic waves are reflected when encountering the obstacle, the reflected ultrasonic waves are received by the ultrasonic receiving device 220, and an echo signal is formed, and the echo signal is an analog signal.
The processing circuit 100 includes a driving circuit 110, a sampling unit 120, a threshold comparing unit 130, and a main control circuit unit 140.
As shown in fig. 1, the input end and the output end of the driving circuit 110 are respectively electrically connected with the first output end of the main control circuit unit 140 and the input end of the ultrasonic wave transmitting device 210, the main control circuit unit 140 sends a control signal to the driving circuit 110, and the driving circuit 110 is controlled by the main control circuit unit 140 to generate an ultrasonic wave driving signal to the ultrasonic wave transmitting device 210 so as to drive the ultrasonic wave transmitting device 210 to transmit ultrasonic waves.
As shown in fig. 2, a first input end of the sampling unit 120 is electrically connected to an output end of the ultrasonic receiving device 220, after the ultrasonic transmitting device 210 transmits ultrasonic waves, the transmitted ultrasonic waves are reflected back when encountering an obstacle, at this time, the ultrasonic receiving device 220 receives the reflected ultrasonic waves and converts the reflected ultrasonic waves into echo signals, the sampling unit 120 receives the echo signals output by the ultrasonic receiving device 220, and the sampling unit 120 converts the received echo signals into first signals, wherein the sampling unit 120 is an ADC analog-to-digital converter, and the ADC analog-to-digital converter converts the echo signals (i.e., analog signals) into first signals (i.e., digital signals).
As shown in fig. 2, an input end of the threshold comparing unit 130 is electrically connected to an output end of the sampling unit 120, the threshold comparing unit 130 receives the first signal output by the sampling unit 120, the threshold comparing unit 130 performs threshold comparison on the received first signal with a preset threshold preset by the threshold comparing unit 130, and outputs a threshold comparison result; specifically, the threshold comparing unit 130 is configured to compare the received first signal with a preset threshold preset by the threshold comparing unit 130, and when the first signal is greater than the preset threshold, the threshold comparing unit 130 inverts the first signal and outputs a second signal (i.e. an inverted signal); the threshold comparing unit 130 is a threshold comparator, the non-inverting terminal (Vin) of the corresponding threshold comparator is electrically connected to the output terminal of the sampling unit 120, and the inverting terminal (Vth) of the threshold comparator is electrically connected to a voltage reference (corresponding to a preset threshold).
As shown in fig. 1, the input end of the main control circuit unit 140 is electrically connected to the output end of the threshold comparison unit 130, the main control circuit unit 140 receives the threshold comparison result output by the threshold comparison unit 130, and the main control circuit unit 140 determines whether the echo signal is an echo signal reflected by an obstacle according to the threshold comparison result, specifically, when the main control circuit unit 140 continuously generates a preset number of received second signals or periodically continuously generates a preset number of received second signals within a certain time, the main control circuit unit 140 determines that the echo signal received by the sampling unit 120 is an echo signal reflected by an obstacle, thereby saving a large amount of buffers, reducing hardware cost and power consumption, simultaneously improving the determination speed of echo occurrence, and improving the detection precision.
A second output terminal of the main control circuit unit 140 is electrically connected to a second input terminal of the sampling unit 120; when the main control circuit unit 140 determines that the echo signal is the echo signal reflected by the obstacle, the main control circuit 140 always turns off the sampling unit 120 before controlling the driving circuit 110 to generate the ultrasonic driving signal next time, that is, controlling the sampling unit 120 to stop continuing the sampling and the conversion, thereby reducing the power consumption of the circuit.
Fig. 3 schematically shows an ultrasonic echo signal processing circuit according to a second embodiment of the present utility model. As shown in fig. 3, other circuit structures of the processing circuit 100 are the same as those shown in fig. 1 and 2, and are not described herein, and the difference between the circuit structures of the embodiment and those shown in fig. 1 and 2 is that the processing circuit 100 includes a register 150, and the register 150 is electrically connected between the output end of the sampling unit 120 and the input end of the threshold comparing unit 130; the register 150 receives the first signals output by the sampling unit 120 and inputs the first signals into different addresses of the register 150 in a bit-by-bit sequence, and then the register 150 sequentially transmits the first signals input into different addresses to the threshold comparison unit 130 bit by bit for threshold comparison, so that the accuracy and the comparison speed can be improved.
The capacity of the register 150 may be set according to the ratio of the operation efficiencies of the sampling unit 120 and the threshold comparing unit 130 so that the sampling frequency of the sampling unit 120 is consistent with the operation frequency of the threshold comparing unit 130.
An ultrasonic echo signal processing circuit according to a third embodiment of the present utility model is schematically shown in fig. 4. As shown in fig. 4, other circuit structures of the processing circuit 100 are the same as those shown in fig. 3, and are not described herein, and the difference between the circuit structures shown in fig. 3 is that the threshold comparing unit 130 in the processing circuit 100 includes at least two threshold comparing units 130, the input ends of the different threshold comparing units 130 are respectively electrically connected with different output ends of the register 150, the output ends of the different threshold comparing units 130 are respectively electrically connected with different input ends of the main control circuit unit 140, and the different threshold comparing units 130 are used for simultaneously processing different first signals, so as to improve the processing speed.
Since the data to be held sampled by the sampling unit 120 can be input to the threshold comparing unit 130 for comparison at once, the sampling and processing frequency of the sampling unit 120 is kept as consistent as possible with the operating frequency of the threshold comparator. In general, the sampling frequency of the sampling unit 120 is higher than the operating frequency of the threshold value comparing unit 130, so that in order to avoid that more data is sampled and processed by the sampling unit 120, the threshold value comparing unit 130 is not enough to process the data to be accumulated, so that multiple parallel threshold value comparator circuits can be provided to process multiple data simultaneously; compared with the ADC sampling register in the prior art, the DSP extracts data, and the processing speed is improved.
An ultrasonic echo signal processing circuit according to a fourth embodiment of the present utility model is schematically shown in fig. 5. As shown in fig. 5, the other circuit structures of the processing circuit 100 may be the same as the circuit structures shown in fig. 1 and 2, may be the same as the circuit structures shown in fig. 3, and may be the same as the circuit structures shown in fig. 4, and the same parts will not be described herein, except that the processing circuit 100 includes an amplifying unit/filtering unit 160, where a first input terminal and an output terminal of the amplifying unit/filtering unit 160 are electrically connected to an output terminal of the ultrasonic receiving device 220 and a first input terminal of the sampling unit 120, respectively, and the amplifying unit/filtering unit 160 is used for amplifying/filtering echo signals.
It should be noted that the first input and output of the amplifying unit/filtering unit 160 may also be electrically connected to the output of the sampling unit 120 and the input of the threshold comparing unit 130, respectively, that is, the amplifying/filtering operation is performed on the first signal.
The processing circuit 100 further includes an echo intensity adjusting module 170, wherein an input end and an output end of the echo intensity adjusting module 170 are respectively electrically connected with a third output end of the main control circuit unit 140 and a second input end of the amplifying unit, and the echo intensity adjusting module 170 controls the main control circuit unit 140 to adjust the amplification factor of the amplifying unit to the echo signal or the first signal.
In practice this may occur: when the distance to the obstacle is short, but because the received signal is insufficiently processed (amplified), it is erroneously determined that the echo signal is not received. Therefore, it is necessary to design an echo intensity adjusting module 170 to change the amplification factor of the echo signal or the first signal, so as to implement self-adjustment of signal processing (amplification) and reduce echo detection errors.
According to a second aspect of the present utility model, there is provided a chip comprising the ultrasonic echo signal processing circuit of any one of the embodiments described above.
According to a third aspect of the present utility model, fig. 6 schematically shows an automotive radar device according to an embodiment of the present utility model. As shown in fig. 6, the automotive radar device includes the chip and the ultrasonic transducer 200 described above.
The automobile radar can be connected with the upper computer 300 to realize the communication function of ultrasonic ranging and the upper computer 300, and can display the measured information such as the obstacle distance or the echo intensity adjustment value (gain value), and the like, thereby being convenient for visually displaying the related information and being convenient for checking.
What has been described above is merely some embodiments of the present utility model. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the utility model.
Claims (11)
1. An ultrasonic echo signal processing circuit for electrical connection with an ultrasonic transducer comprising an ultrasonic receiving device, comprising:
the first input end of the sampling unit is electrically connected with the output end of the ultrasonic receiving device, and the sampling unit receives the echo signal output by the ultrasonic receiving device and converts the echo signal into a first signal;
the input end of the threshold comparison unit is electrically connected with the output end of the sampling unit, and the threshold comparison unit receives the first signal to perform threshold comparison and outputs a threshold comparison result;
the main control circuit unit is electrically connected with the input end of the main control circuit unit and the output end of the threshold comparison unit, receives the threshold comparison result and judges whether the echo signal is reflected by an obstacle or not according to the threshold comparison result.
2. The ultrasonic echo signal processing circuit according to claim 1, wherein the threshold comparing unit is configured to compare the received first signal with a preset threshold value, and output a second signal when the first signal is greater than the preset threshold value.
3. The ultrasonic echo signal processing circuit according to claim 1, further comprising a driving circuit, wherein the ultrasonic transducer comprises an ultrasonic transmitting device, and an input end and an output end of the driving circuit are respectively electrically connected with the first output end of the main control circuit unit and the input end of the ultrasonic transmitting device;
the driving circuit is controlled by the main control circuit unit to generate an ultrasonic driving signal to drive the ultrasonic transmitting device.
4. The ultrasonic echo signal processing circuit according to claim 3, wherein the second output terminal of the main control circuit unit is electrically connected to the second input terminal of the sampling unit;
the main control circuit closes the sampling unit before generating the ultrasonic driving signal.
5. The ultrasonic echo signal processing circuit according to any one of claims 1 to 4, further comprising a register electrically connected between an output of the sampling unit and an input of the threshold comparison unit;
the register receives the first signals and inputs the first signals into different addresses one by one according to the sequence;
the register sequentially transmits the first signals input into different addresses bit by bit to the threshold comparison unit for threshold comparison.
6. The ultrasonic echo signal processing circuit according to claim 5, wherein at least two threshold comparison units are provided, the input ends of different threshold comparison units are respectively electrically connected with different output ends of the register, and the output ends of different threshold comparison units are respectively electrically connected with different input ends of the main control circuit unit;
the different threshold comparison units are used for simultaneously processing the different first signals.
7. The ultrasonic echo signal processing circuit according to claim 5, wherein a capacity of the register is set in accordance with a ratio of operating efficiencies of the sampling unit and the threshold comparing unit so that a sampling frequency of the sampling unit is kept identical to an operating frequency of the threshold comparing unit.
8. The ultrasonic echo signal processing circuit according to any one of claims 1 to 4, further comprising an amplifying unit/filtering unit, wherein a first input terminal, an output terminal, of the amplifying unit/filtering unit is electrically connected to the output terminal of the ultrasonic receiving device, the first input terminal of the sampling unit, or the output terminal of the sampling unit, the input terminal of the threshold comparing unit, respectively;
the amplifying unit/filtering unit is used for amplifying/filtering the echo signal or the first signal.
9. The ultrasonic echo signal processing circuit according to claim 8, further comprising an echo intensity adjusting module, wherein an input end and an output end of the echo intensity adjusting module are respectively electrically connected with a third output end of the main control circuit unit and a second input end of the amplifying unit;
the echo intensity adjusting module is controlled by the main control circuit unit to adjust the amplification factor of the amplifying unit on the echo signal or the first signal.
10. A chip comprising the ultrasound echo signal processing circuit of any one of claims 1-9.
11. An automotive radar device comprising the ultrasonic transducer and the chip of claim 10.
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| CN202223609598.3U CN219225089U (en) | 2022-12-30 | 2022-12-30 | Ultrasonic echo signal processing circuit, chip and automobile radar device |
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| CN202223609598.3U CN219225089U (en) | 2022-12-30 | 2022-12-30 | Ultrasonic echo signal processing circuit, chip and automobile radar device |
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