CN117008111A - Barrier radar device and target detection method - Google Patents
Barrier radar device and target detection method Download PDFInfo
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- CN117008111A CN117008111A CN202311283676.1A CN202311283676A CN117008111A CN 117008111 A CN117008111 A CN 117008111A CN 202311283676 A CN202311283676 A CN 202311283676A CN 117008111 A CN117008111 A CN 117008111A
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- 238000001514 detection method Methods 0.000 title claims abstract description 121
- 230000004888 barrier function Effects 0.000 title claims abstract description 23
- 238000005259 measurement Methods 0.000 claims description 34
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- 238000010586 diagram Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/04—Systems determining presence of a target
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a barrier radar device and a target detection method, wherein the barrier radar device comprises a circuit board, and the circuit board is integrated with: the device comprises a wide-beam millimeter wave radar transceiver antenna unit, a narrow-beam millimeter wave radar transceiver antenna unit, a wide-beam radio frequency unit, a narrow-beam radio frequency unit, a wide-beam intermediate frequency unit, a narrow-beam intermediate frequency unit, a signal processing unit, a data processing unit, a power supply unit, a clock unit and an external interface circuit; the narrow beam millimeter wave radar receiving and transmitting antenna unit, the narrow beam radio frequency unit and the narrow beam intermediate frequency unit are sequentially connected, the wide beam millimeter wave radar receiving and transmitting antenna unit, the wide beam radio frequency unit and the wide beam intermediate frequency unit are sequentially connected, the narrow beam intermediate frequency unit and the wide beam intermediate frequency unit are simultaneously connected with the input end of the signal processing unit, the output end of the signal processing unit is connected with the input end of the data processing unit, and the output end of the data processing unit is connected with the external output interface. The invention can improve the accuracy and the detection precision of vehicle detection.
Description
Technical Field
The invention relates to the technical field of radar detection, in particular to a barrier gate radar device and a target detection method.
Background
Along with the increasing of private car possession in China, the demand quantity for parking lots is increasing, parking lot management is also increasing, the current parking lots basically adopt a gateway entrance vehicle entrance management mode, each parking lot is less in number and is provided with a plurality of gateway entrance, and a gateway adopted by the gateway has various forms including a straight bar, a grating bar or a billboard bar and the like. When an external vehicle enters the parking lot from the gate port or the vehicle in the parking lot exits from the gate port, the vehicle license plate is firstly irradiated by the camera, the vehicle can continue to pass after the gate rod controlling the gate port is lifted, and the passing gate rod needs to be timely closed after the vehicle leaves the gate port. The inductive sensor for detecting the vehicle driving out of the gate opening in the traditional parking lot is a ground induction coil, the inductive coil detects the existence and the departure of the vehicle mainly by sensing whether a larger metal object exists in the surrounding distance range, if the vehicle is still at the gate opening, the ground induction coil detects the vehicle, at the moment, the gate rod does not drop down, and only when the ground induction coil detects that no vehicle exists, the gate rod drops down. The method needs to embed the ground sensing coil into the ground, and once the ground of the gate is provided with metal objects such as steel bars, steel meshes and the like, the ground sensing coil cannot be used in the scene, and the ground sensing coil is easy to be rolled for a long time by a heavy vehicle to cause damage, and vehicles with different chassis heights are easy to leak detection. In order to overcome the defects above the ground induction coil, the millimeter wave radar has been installed and applied to the road gate of the parking lot a few years ago, the millimeter wave radar avoids the need of damaging the ground, is not influenced by the passing and rolling of heavy vehicles, and can be suitable for the scene of metal objects on the ground of the road gate and the like. Early barrier radar basically adopts a radar to the mode of passing vehicle response, detects the accuracy not high, to the gate way of bill-board or barrier railing, often adopts the slope installation, and the antenna beam of millimeter wave radar avoids bill-board or barrier railing position area, is the blind area that millimeter wave radar beam shines under the bill-board or the barrier railing like this, if the head or the afterbody edge of vehicle just stops under bill-board or barrier railing, millimeter wave radar will not detect the vehicle, and bill-board or barrier railing just can drop this moment, causes to pound the car incident. Two radar application modes are used later, two radar beams point to different directions, one radar beam points to a vehicle for triggering the vehicle, and the other radar beam points to the vehicle driving direction at a gate opening vertically for detecting the existence of the vehicle.
Therefore, the millimeter wave radar is designed to cover the area right below the billboard or the fence, the accuracy of the barrier radar on vehicle detection is improved, and the occurrence of the barrier exit/entrance collision event is particularly necessary.
Disclosure of Invention
The invention aims to provide a barrier radar device and a target detection method, so as to improve the accuracy and detection precision of vehicle detection.
The technical scheme for solving the technical problems is as follows:
the invention provides a barrier gate radar device, which comprises a circuit board, wherein the circuit board is integrated with:
the device comprises a wide-beam millimeter wave radar transceiver antenna unit, a narrow-beam millimeter wave radar transceiver antenna unit, a wide-beam radio frequency unit, a narrow-beam radio frequency unit, a wide-beam intermediate frequency unit, a narrow-beam intermediate frequency unit, a signal processing unit, a data processing unit, a power supply unit, a clock unit and an external interface circuit;
the narrow beam millimeter wave radar receiving and transmitting antenna unit, the narrow beam radio frequency unit and the narrow beam intermediate frequency unit are sequentially connected, the wide beam millimeter wave radar receiving and transmitting antenna unit, the wide beam radio frequency unit and the wide beam intermediate frequency unit are sequentially connected, the narrow beam intermediate frequency unit and the wide beam intermediate frequency unit are simultaneously connected with the input end of the signal processing unit, the output end of the signal processing unit is connected with the input end of the data processing unit, and the output end of the data processing unit is connected with an external output interface;
the narrow-beam millimeter wave radar transceiver antenna unit comprises a narrow-beam transmitting antenna and a narrow-beam receiving antenna, wherein the narrow-beam transmitting antenna is used for continuously transmitting millimeter wave signals to a free space so as to detect a target; the narrow beam receiving antenna is used for receiving a first echo signal of the target in a first area;
the first echo signal sequentially passes through the narrow beam radio frequency unit, the narrow beam intermediate frequency unit and the signal processing unit to form a processed echo signal, and then enters the data processing unit, the data processing unit generates a wide beam opening control signal according to the processed echo signal, and the wide beam opening control signal sequentially passes through the signal processing unit, the wide beam intermediate frequency unit and the wide beam radio frequency unit and enters the wide beam millimeter wave radar receiving and transmitting antenna unit to control the wide beam millimeter wave radar receiving and transmitting antenna unit and the narrow beam millimeter wave radar receiving and transmitting antenna unit to perform target detection in a second area; the target comprises a vehicle.
Optionally, the signal processing unit is configured to:
receiving a wide-beam intermediate frequency signal;
converting the wide beam intermediate frequency signal into a wide beam digital signal by using a wide beam A/D converter;
performing wide-beam frequency measurement on the wide-beam digital signal by using fast Fourier transform to obtain a wide-beam frequency measurement result;
generating a wide beam target detection result according to the wide beam frequency measurement result;
and
receiving a narrow beam intermediate frequency signal;
converting the narrow beam intermediate frequency signal into a narrow beam digital signal by using a narrow beam A/D converter;
carrying out narrow beam frequency measurement on the narrow beam digital signal by utilizing fast Fourier transform to obtain a narrow beam frequency measurement result;
generating a narrow beam target detection result according to the narrow beam frequency measurement result;
and simultaneously transmitting the wide beam target detection result and the narrow beam target detection result to the data processing unit as output data.
Optionally, the data processing unit is configured to:
receiving output data output by the signal processing unit;
and making a target existence decision according to the output data.
Optionally, the second area is larger than the first area.
The invention also provides a target detection method based on the barrier radar device, which comprises the following steps:
s1: controlling a narrow-beam millimeter wave radar receiving and transmitting antenna unit to continuously transmit millimeter wave signals to a free space so as to detect a target, and obtaining a first detection result;
s2: judging whether the first detection result comprises a target or not, if so, entering S3; otherwise, returning to S1;
s3: generating a wide beam opening control signal according to the first detection result;
s4: according to the wide-beam opening control signal, controlling the wide-beam millimeter wave radar receiving and transmitting antenna unit to continuously transmit millimeter wave signals to the free space, and controlling the narrow-beam millimeter wave radar receiving and transmitting antenna unit to continuously transmit millimeter wave signals to the free space, so as to generate a second detection result;
s5: respectively carrying out signal processing on a wide beam detection result and a narrow beam detection result in the second detection result to obtain a wide beam target detection result and a narrow beam target detection result;
s6: and carrying out target existence decision according to the wide beam target detection result and the narrow beam target detection result.
Optionally, the S5 includes:
s51: receiving the wide beam detection result and the narrow beam detection result;
s52: converting the wide beam intermediate frequency signal in the wide beam detection result into a wide beam digital signal by using a wide beam A/D converter, and converting the narrow beam intermediate frequency signal in the narrow beam detection result into a narrow beam digital signal by using a narrow beam A/D converter;
s53: the fast Fourier transform is utilized to carry out frequency measurement on the wide-beam digital signal and the narrow-beam digital signal, so as to obtain a wide-beam frequency measurement result and a narrow-beam frequency measurement result;
s54: and generating a wide beam target detection result and a narrow beam target detection result according to the wide beam frequency measurement result and the narrow beam frequency measurement result respectively.
Optionally, in the step S5, the wide beam target detection result includes presence target and absence target
The narrow beam target detection result comprises a presence target and an absence target;
the step S6 comprises the following steps:
if the narrow beam target detection result and the wide beam target detection result are both the target which does not exist, outputting a target decision which does not exist;
if the target does not exist in the wide beam target detection result, outputting a target existence decision;
if the target does not exist in the narrow beam target detection result, outputting a target existence decision if the target exists in the wide beam target detection result;
if targets exist in the wide-beam target detection result and the narrow-beam target detection result, a target existence decision is also output.
The invention has the following beneficial effects:
by the technical method, when a passing vehicle just enters a detection area of the millimeter wave radar, a vehicle target is detected only by the narrow-beam millimeter wave radar receiving and transmitting antenna unit, and the wide-beam radar is not started; when the target is in the area of the simultaneous irradiation of the narrow-beam millimeter wave radar receiving and transmitting antenna unit and the wide-beam millimeter wave radar receiving and transmitting antenna unit, the vehicle target is detected simultaneously, the accuracy of vehicle detection is improved, and even if a large inclination angle is arranged between the vehicle and the radar, the barrier radar can accurately detect the existence of the vehicle without missed detection, so that the detection accuracy can be improved.
Drawings
FIG. 1 is a schematic diagram of a barrier radar apparatus;
FIG. 2 is a schematic diagram of a signal processing unit and an output processing unit;
fig. 3 is a schematic diagram of layout structures of a wide-beam millimeter wave radar transceiver antenna unit and a narrow-beam millimeter wave radar transceiver antenna unit on a circuit board;
fig. 4 is a flow chart of a target detection method.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
The invention provides a barrier gate radar device, which comprises a circuit board, wherein the circuit board is integrated with:
the device comprises a wide-beam millimeter wave radar transceiver antenna unit, a narrow-beam millimeter wave radar transceiver antenna unit, a wide-beam radio frequency unit, a narrow-beam radio frequency unit, a wide-beam intermediate frequency unit, a narrow-beam intermediate frequency unit, a signal processing unit, a data processing unit and an external interface circuit.
Referring to fig. 1, a narrow beam millimeter wave radar receiving and transmitting antenna unit, a narrow beam radio frequency unit and a narrow beam intermediate frequency unit are sequentially connected, a wide beam millimeter wave radar receiving and transmitting antenna unit, a wide beam radio frequency unit and a wide beam intermediate frequency unit are sequentially connected, the narrow beam intermediate frequency unit and the wide beam intermediate frequency unit are simultaneously connected with an input end of a signal processing unit, an output end of the signal processing unit is connected with an input end of a data processing unit, and an output end of the data processing unit is connected with an external output interface;
here, the functions of the rf unit and the if unit are well known to those skilled in the art, and the present invention is not described in detail.
The signal processed by the intermediate frequency unit is an analog signal, so the invention converts the analog signal into a digital signal through the processing of the signal processing unit, and then the frequency measurement is carried out by utilizing the fast Fourier transform, thereby identifying the detection target. That is, referring to fig. 2, the signal processing unit of the present invention is configured to: receiving a wide-beam intermediate frequency signal; converting the wide beam intermediate frequency signal into a wide beam digital signal by using a wide beam A/D converter; performing wide-beam frequency measurement on the wide-beam digital signal by using fast Fourier transform to obtain a wide-beam frequency measurement result; generating a wide beam target detection result according to the wide beam frequency measurement result; receiving a narrow beam intermediate frequency signal; converting the narrow beam intermediate frequency signal into a narrow beam digital signal by using a narrow beam A/D converter; carrying out narrow beam frequency measurement on the narrow beam digital signal by utilizing fast Fourier transform to obtain a narrow beam frequency measurement result; generating a narrow beam target detection result according to the narrow beam frequency measurement result; and simultaneously transmitting the wide-beam target detection result and the narrow-beam target detection result as output data to a data processing unit.
In addition, the overall layout of the wide-beam millimeter wave radar transceiver antenna unit and the narrow-beam millimeter wave radar transceiver antenna unit on a circuit board is shown in reference to fig. 3, the narrow-beam transceiver antenna is placed parallel to the long-side direction of the circuit board, and the length dimension of the receiving antenna is slightly short, so that a space is reserved for placing the wide-beam transceiver antenna. Therefore, the horizontal direction wave beam of the narrow-beam millimeter wave radar receiving and transmitting antenna unit is narrow, the horizontal direction wave beam of the wide-beam millimeter wave radar receiving and transmitting antenna unit is wide, the coverage area is large, and the wide-beam millimeter wave radar receiving and transmitting antenna unit and the narrow-beam millimeter wave radar receiving and transmitting antenna unit are both pointed in the normal direction of the circuit board. Based on the above, the narrow beam millimeter wave radar transceiver antenna unit comprises a narrow beam transmitting antenna and a narrow beam receiving antenna, wherein the narrow beam transmitting antenna is used for continuously transmitting millimeter wave signals to a free space so as to detect a target; the narrow beam receiving antenna is used for receiving a first echo signal of which the target is located in the first area. The wide-beam millimeter wave radar transceiver antenna unit also comprises a wide-beam transmitting antenna and a wide-beam receiving antenna.
The first echo signals sequentially pass through the narrow beam radio frequency unit, the narrow beam intermediate frequency unit and the signal processing unit, the processed echo signals are formed and then enter the data processing unit, the data processing unit generates wide beam opening control signals according to the processed echo signals, and the wide beam opening control signals sequentially pass through the signal processing unit, the wide beam intermediate frequency unit and the wide beam radio frequency unit and enter the wide beam millimeter wave radar receiving and transmitting antenna unit so as to control the wide beam millimeter wave radar receiving and transmitting antenna unit and the narrow beam millimeter wave radar receiving and transmitting antenna unit to detect targets in a second area.
Optionally, the data processing unit is configured to:
receiving output data output by the signal processing unit; namely, a wide beam target detection result and a narrow beam target detection result output by the received signal processing unit.
And making a target existence decision according to the output data.
If the target does not exist in the wide beam target detection result, outputting a target existence decision;
if the target does not exist in the narrow beam target detection result, outputting a target existence decision if the target exists in the wide beam target detection result;
if targets exist in the wide beam target detection result and the narrow beam target detection result, outputting a target existence decision;
and if the target does not exist in the wide beam target detection result and the narrow beam target detection result, outputting a target-nonexistence decision.
Namely: when the narrow beam millimeter wave radar detects a vehicle target in a first area (when the billboard or the fence is in a lifting state), the wide beam millimeter wave radar is started to start working immediately, the vehicle target in a coverage area (a second area) is detected, and the two millimeter wave radars detect the passing vehicle target in the area at the same time and jointly judge the existence of the vehicle.
Also, the second area needs to be larger than the first area.
When a passing vehicle just enters a detection area of the millimeter wave radar, a vehicle target is detected only by a narrow-beam millimeter wave radar receiving and transmitting antenna unit, and the wide-beam radar is not started; when the target is in the area of the simultaneous irradiation of the narrow-beam millimeter wave radar receiving and transmitting antenna unit and the wide-beam millimeter wave radar receiving and transmitting antenna unit, the vehicle target is detected simultaneously, the accuracy of vehicle detection is improved, and even if a large inclination angle is arranged between the vehicle and the radar, the barrier radar can accurately detect the existence of the vehicle without missed detection, so that the detection accuracy can be improved.
The invention also provides a target detection method based on the barrier radar device, and referring to fig. 4, the target detection method comprises the following steps:
s1: controlling a narrow-beam millimeter wave radar receiving and transmitting antenna unit to continuously transmit millimeter wave signals to a free space so as to detect a target, and obtaining a first detection result;
s2: judging whether the first detection result comprises a target or not, if so, entering S3; otherwise, returning to S1;
s3: generating a wide beam opening control signal according to the first detection result;
s4: according to the wide-beam starting control signal, controlling the wide-beam millimeter wave radar receiving and transmitting antenna unit to continuously transmit millimeter wave signals to the free space, and controlling the narrow-beam millimeter wave radar receiving and transmitting antenna unit to continuously transmit millimeter wave signals to the free space, so as to generate a second detection result;
s5: respectively carrying out signal processing on a wide beam detection result and a narrow beam detection result in the second detection result to obtain a wide beam target detection result and a narrow beam target detection result;
s6: and carrying out target existence decision according to the wide-beam target detection result and the narrow-beam target detection result.
Optionally, S5 includes:
s51: receiving a wide beam detection result and a narrow beam detection result;
s52: converting the wide beam intermediate frequency signal in the wide beam detection result into a wide beam digital signal by using a wide beam A/D converter, and converting the narrow beam intermediate frequency signal in the narrow beam detection result into a narrow beam digital signal by using a narrow beam A/D converter;
s53: frequency measurement is carried out on the wide-beam digital signal and the narrow-beam digital signal by utilizing fast Fourier transform, so that a wide-beam frequency measurement result and a narrow-beam frequency measurement result are obtained;
s54: and generating a wide beam target detection result and a narrow beam target detection result according to the wide beam frequency measurement result and the narrow beam frequency measurement result respectively.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (7)
1. The utility model provides a banister radar apparatus, its characterized in that, banister radar apparatus includes the circuit board, integrate on the circuit board and have:
the device comprises a wide-beam millimeter wave radar transceiver antenna unit, a narrow-beam millimeter wave radar transceiver antenna unit, a wide-beam radio frequency unit, a narrow-beam radio frequency unit, a wide-beam intermediate frequency unit, a narrow-beam intermediate frequency unit, a signal processing unit, a data processing unit, a power supply unit, a clock unit and an external interface circuit;
the narrow beam millimeter wave radar receiving and transmitting antenna unit, the narrow beam radio frequency unit and the narrow beam intermediate frequency unit are sequentially connected, the wide beam millimeter wave radar receiving and transmitting antenna unit, the wide beam radio frequency unit and the wide beam intermediate frequency unit are sequentially connected, the narrow beam intermediate frequency unit and the wide beam intermediate frequency unit are simultaneously connected with the input end of the signal processing unit, the output end of the signal processing unit is connected with the input end of the data processing unit, and the output end of the data processing unit is connected with an external output interface;
the narrow-beam millimeter wave radar transceiver antenna unit comprises a narrow-beam transmitting antenna and a narrow-beam receiving antenna, wherein the narrow-beam transmitting antenna is used for continuously transmitting millimeter wave signals to a free space so as to detect a target; the narrow beam receiving antenna is used for receiving a first echo signal of the target in a first area;
the first echo signal sequentially passes through the narrow beam radio frequency unit, the narrow beam intermediate frequency unit and the signal processing unit to form a processed echo signal, and then enters the data processing unit, the data processing unit generates a wide beam opening control signal according to the processed echo signal, and the wide beam opening control signal sequentially passes through the signal processing unit, the wide beam intermediate frequency unit and the wide beam radio frequency unit and enters the wide beam millimeter wave radar receiving and transmitting antenna unit to control the wide beam millimeter wave radar receiving and transmitting antenna unit and the narrow beam millimeter wave radar receiving and transmitting antenna unit to perform target detection in a second area;
the target comprises a vehicle.
2. The banister radar apparatus according to claim 1, wherein said signal processing unit is configured to:
receiving a wide-beam intermediate frequency signal;
converting the wide beam intermediate frequency signal into a wide beam digital signal by using a wide beam A/D converter;
performing wide-beam frequency measurement on the wide-beam digital signal by using fast Fourier transform to obtain a wide-beam frequency measurement result;
generating a wide beam target detection result according to the wide beam frequency measurement result;
and
receiving a narrow beam intermediate frequency signal;
converting the narrow beam intermediate frequency signal into a narrow beam digital signal by using a narrow beam A/D converter;
carrying out narrow beam frequency measurement on the narrow beam digital signal by utilizing fast Fourier transform to obtain a narrow beam frequency measurement result;
generating a narrow beam target detection result according to the narrow beam frequency measurement result;
and simultaneously transmitting the wide beam target detection result and the narrow beam target detection result to the data processing unit as output data.
3. The banister radar apparatus according to claim 1, wherein said data processing unit is configured to:
receiving output data output by the signal processing unit;
and making a target existence decision according to the output data.
4. A barrier radar apparatus according to any one of claims 1 to 3, wherein the second area is larger than the first area.
5. A target detection method based on the barrier radar apparatus according to any one of claims 1 to 4, characterized in that the target detection method comprises:
s1: controlling a narrow-beam millimeter wave radar receiving and transmitting antenna unit to continuously transmit millimeter wave signals to a free space so as to detect a target, and obtaining a first detection result;
s2: judging whether the first detection result comprises a target or not, if so, entering S3; otherwise, returning to S1;
s3: generating a wide beam opening control signal according to the first detection result;
s4: according to the wide-beam opening control signal, controlling the wide-beam millimeter wave radar receiving and transmitting antenna unit to continuously transmit millimeter wave signals to the free space, and controlling the narrow-beam millimeter wave radar receiving and transmitting antenna unit to continuously transmit millimeter wave signals to the free space, so as to generate a second detection result;
s5: respectively carrying out signal processing on a wide beam detection result and a narrow beam detection result in the second detection result to obtain a wide beam target detection result and a narrow beam target detection result;
s6: and carrying out target existence decision according to the wide beam target detection result and the narrow beam target detection result.
6. The target detection method according to claim 5, wherein S5 comprises:
s51: receiving the wide beam detection result and the narrow beam detection result;
s52: converting the wide beam intermediate frequency signal in the wide beam detection result into a wide beam digital signal by using a wide beam A/D converter, and converting the narrow beam intermediate frequency signal in the narrow beam detection result into a narrow beam digital signal by using a narrow beam A/D converter;
s53: the fast Fourier transform is utilized to carry out frequency measurement on the wide-beam digital signal and the narrow-beam digital signal, so as to obtain a wide-beam frequency measurement result and a narrow-beam frequency measurement result;
s54: and generating a wide beam target detection result and a narrow beam target detection result according to the wide beam frequency measurement result and the narrow beam frequency measurement result respectively.
7. The target detection method according to claim 5, wherein in S5, the wide beam target detection result includes a presence target and an absence target;
the narrow beam target detection result comprises a presence target and an absence target;
the step S6 comprises the following steps:
if the narrow beam target detection result and the wide beam target detection result are both the target which does not exist, outputting a target decision which does not exist;
if the target does not exist in the wide beam target detection result, outputting a target existence decision;
if the target does not exist in the narrow beam target detection result, outputting a target existence decision if the target exists in the wide beam target detection result;
if targets exist in the wide-beam target detection result and the narrow-beam target detection result, a target existence decision is also output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202311283676.1A CN117008111A (en) | 2023-10-07 | 2023-10-07 | Barrier radar device and target detection method |
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