CN116008928A - Doppler microwave radar simulator based on circular polarization design and microwave radar test system - Google Patents
Doppler microwave radar simulator based on circular polarization design and microwave radar test system Download PDFInfo
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Abstract
The invention provides a Doppler microwave radar simulator based on circular polarization design and a microwave radar test system, which can accurately receive, modulate and output target simulation signals through a receiving antenna, a transmitting antenna and a signal processing component which are integrated on a circuit board of the simulator, reduce the polarization deflection problem caused by the difference of the spatial arrangement positions of a plurality of tested radar products when the tested products are simultaneously measured by using strict circular polarization design, reduce measurement errors and improve the consistency of test results.
Description
Technical Field
The invention relates to the field of microwave radars, in particular to a Doppler microwave radar simulator based on circular polarization design and a microwave radar testing system.
Background
With the gradual deepening of radar technology from military to civil use, microwave radar is used as a sensor and applied to various consumer products. The microwave radar sensor can be installed in a hidden mode, is not influenced by temperature, air flow, dust, smoke and the like, has the advantages of long service life, high reaction speed, higher sensitivity, wide induction area and the like, and is also widely used in the fields of energy-saving illumination, intelligent household appliances and the like. The test scheme of the matched microwave radar sensor is focused on so as to solve the problems of radar index test in the research and development stage and radar batch detection in the production stage.
For a common microwave radar sensor testing scheme, a triangular cone and a swinging device are often adopted as detection targets of a radar sensor during testing; a disadvantage of this approach is that the test results are perceptual and difficult to quantify; particularly in production testing, when a plurality of radar sensor products are simultaneously tested for detection with a target, such a solution can amplify deviations in the sensing results of different radar sensors, resulting in deterioration of consistency.
Disclosure of Invention
In view of the above drawbacks of the prior art, an object of the present invention is to provide a doppler microwave radar simulator and a microwave radar testing system based on circular polarization design, which are used for solving the above technical problems in the prior art.
To achieve the above and other related objects, the present invention provides a doppler microwave radar simulator based on a circular polarization design, comprising: a receiving antenna, a transmitting antenna and a signal processing part integrated on the simulator circuit board; wherein the signal processing section includes: the low-noise amplifier, the matching balun, the phase shifter, the micro-control chip, the digital-to-analog converter, the first mixer, the second mixer and the power amplifier; the receiving antenna and the transmitting antenna adopt regular polygon microstrip patch structures and are respectively embedded in the front of the simulator circuit board; a feed network matched with the receiving antenna and the transmitting antenna is respectively arranged on the back of the simulator circuit board; the receiving antenna and the transmitting antenna are respectively provided with a first feeding point and a second feeding point, and the first feeding point and the second feeding point connect the antennas with the corresponding feed networks in the form of metal through holes; the first feeding point and the second feeding point are equal in distance from the geometric center of the corresponding antenna, and connecting lines of the two feeding points to the geometric center are orthogonal to each other; the receiving antenna converts received electromagnetic waves sent by the radar sensor into a pair of orthogonal radio frequency signals by combining with a corresponding feed network; the transmitting antenna generates circularly polarized electromagnetic waves from signals processed by the orthogonal radio frequency signals through the signal processing component and transmits the circularly polarized electromagnetic waves to the radar sensor through combination with a corresponding feed network.
In an embodiment of the present invention, each feed network is provided with a power divider and a resistor; one end of the power divider is connected with a first feeding point and a second feeding point of the corresponding antenna, and the other end of the power divider is connected with the low-noise amplifier or the power amplifier arranged on the back surface of the simulator circuit board; the resistor bridges a first specific position and a second specific position which are respectively arranged on the transmission sections from the first feeding point and the second feeding point to the power divider respectively.
In an embodiment of the present invention, a first length relationship is satisfied between a transmission segment length between the first specific location and the first feeding point and a transmission segment length between the second specific location and the second feeding point, and a second length relationship is satisfied between a transmission segment length between the first specific location and the power divider and a transmission segment length between the second specific location and the power divider, so that a phase difference relationship between the first feeding point and the second feeding point is exactly 90 ° and the power of the first feeding point and the second feeding point is equal.
In an embodiment of the present invention, the first length relation includes:
and wherein L A1 For the transmission segment length between the first specific position and the first feeding point, L B2 The second path length is lambda is the wavelength of electromagnetic waves in the air at the working frequency of the radar, epsilon is the dielectric constant of the circuit board, and N is a natural number; the second length relationship includes: corresponding to the length of a transmission section between the first specific position and the power divider and corresponding to the second specific position and the power dividerThe transmission segment lengths between the two are equal.
In an embodiment of the present invention, a length of a transmission segment from the first specific location to the second specific location through the resistor and a length of a transmission segment from the first specific location to the second specific location through the power divider satisfy a third length relationship; wherein the third length relationship comprises:
and wherein L ARB For the transmission segment length from the first specific position to the second specific position through the resistor, L ADB And for the length of a transmission section from the first specific position to the second specific position through the power divider, lambda is the wavelength of electromagnetic waves in air at the working frequency of the radar, epsilon is the dielectric constant of the circuit board, and N is a natural number.
In an embodiment of the present invention, the simulator circuit board has a multi-layer structure, including: the antenna comprises an antenna layer provided with a receiving antenna and a transmitting antenna, a feed network layer provided with a feed network corresponding to the antennas, and a grounding layer arranged between the antenna layer and the feed network layer.
In one embodiment of the present invention, the ground layer is laid with a monolithic piece of copper foil as a common reference ground for the antenna and the feed network.
To achieve the above and other related objects, the present invention provides a microwave radar testing system, comprising: the radar sensors to be tested are respectively arranged on the tool plane of the fixed tool; the Doppler microwave radar simulator based on the circular polarization design is arranged in the normal direction along the tool plane; the Doppler microwave radar simulator based on the circular polarization design sequentially converts received electromagnetic waves emitted by all radar sensors to be detected into a pair of orthogonal radio frequency signals respectively, and sends the corresponding generated circular polarization electromagnetic waves to the corresponding radar sensors for receiving.
In an embodiment of the present invention, a distance between the doppler microwave radar simulator based on the circular polarization design and the tool plane satisfies a fixed distance relationship;
wherein the fixed distance relationship comprises:
and D is the distance between the Doppler microwave radar simulator based on circular polarization design and the plane of the tool, D is the diagonal length of the tool for fixing the radar sensor, and lambda is the wavelength in the air corresponding to the electromagnetic wave under the radar working frequency.
In an embodiment of the invention, the radar sensor to be measured is a linear polarization radar sensor.
As described above, the invention relates to a Doppler microwave radar simulator and a microwave radar test system based on circular polarization design, which have the following beneficial effects: according to the invention, the target analog signals can be accurately received, modulated and output through the receiving antenna, the transmitting antenna and the signal processing component which are integrated on the simulator circuit board, and the strict circular polarization design is utilized, so that the polarization deflection problem caused by the difference of the spatial arrangement positions of the tested products when a plurality of tested radar products are simultaneously measured is reduced, the measurement error is reduced, and the consistency of the test results is improved.
Drawings
Fig. 1 is a schematic structural diagram of a doppler microwave radar simulator based on a circular polarization design according to an embodiment of the invention.
Fig. 2 is a schematic diagram of an antenna layout according to an embodiment of the invention.
Fig. 3 is a schematic diagram of a feeding network according to an embodiment of the present invention.
Fig. 4 is a schematic diagram showing a trace length relationship of a feeding network according to an embodiment of the present invention.
Fig. 5 is a schematic view of an application test environment of a microwave radar test system according to an embodiment of the invention.
Fig. 6 shows a schematic view of a radar sensor installation in an embodiment of the present invention.
Fig. 7 shows a schematic view of polarization deflection of a radar sensor according to an embodiment of the present invention.
Fig. 8 is a schematic view illustrating polarization decomposition of a circularly polarized electromagnetic wave according to an embodiment of the present invention.
FIG. 9 is a diagram showing the axial ratio index of the simulator at each principal direction angle in an embodiment of the invention.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
In the following description, reference is made to the accompanying drawings, which illustrate several embodiments of the invention. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present invention. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present invention is defined only by the claims of the issued patent. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Spatially relative terms, such as "upper," "lower," "left," "right," "lower," "below," "lower," "above," "upper," and the like, may be used herein to facilitate a description of one element or feature as illustrated in the figures relative to another element or feature.
Throughout the specification, when a portion is said to be "connected" to another portion, this includes not only the case of "direct connection" but also the case of "indirect connection" with other elements interposed therebetween. In addition, when a certain component is said to be "included" in a certain section, unless otherwise stated, other components are not excluded, but it is meant that other components may be included.
The first, second, and third terms are used herein to describe various portions, components, regions, layers and/or sections, but are not limited thereto. These terms are only used to distinguish one portion, component, region, layer or section from another portion, component, region, layer or section. Thus, a first portion, component, region, layer or section discussed below could be termed a second portion, component, region, layer or section without departing from the scope of the present invention.
Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including" specify the presence of stated features, operations, elements, components, items, categories, and/or groups, but do not preclude the presence, presence or addition of one or more other features, operations, elements, components, items, categories, and/or groups. The terms "or" and/or "as used herein are to be construed as inclusive, or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a, A is as follows; b, a step of preparing a composite material; c, performing operation; a and B; a and C; b and C; A. b and C). An exception to this definition will occur only when a combination of elements, functions or operations are in some way inherently mutually exclusive.
The invention provides a Doppler microwave radar simulator based on circular polarization design and a microwave radar test system, which can accurately receive, modulate and output target analog signals through a receiving antenna, a transmitting antenna and a signal processing component which are integrated on a simulator circuit board, reduce the problem of polarization deflection caused by the difference of the spatial arrangement positions of a plurality of tested radar products when the tested products are simultaneously measured by using strict circular polarization design, reduce measurement errors and improve the consistency of test results.
The embodiments of the present invention will be described in detail below with reference to the attached drawings so that those skilled in the art to which the present invention pertains can easily implement the present invention. This invention may be embodied in many different forms and is not limited to the embodiments described herein.
Fig. 1 shows a schematic structural diagram of a doppler microwave radar simulator based on a circular polarization design in an embodiment of the present invention.
The structure comprises: a receiving antenna 1, a transmitting antenna 2, and a signal processing part integrated on the simulator circuit board; wherein the signal processing section includes: a low noise amplifier 3, a matching balun 4, a phase shifter 5, a micro-control chip 6, a digital-to-analog converter 7, a first mixer 8, a second mixer 9 and a power amplifier 10; and wherein the low noise amplifier 3, the matching balun 4, and the phase shifter 5 are connected in sequence; the first mixer 8 and the second mixer 9 are connected with the phase shifter 5, the micro-control chip 6 and the digital-to-analog converter 7; the receiving antenna 1 and the transmitting antenna 2 are respectively provided with feed networks 11 and 21 in a matching way; the receiving antenna 1 and the transmitting antenna 2 are connected to a low noise amplifier 3 and a power amplifier 10 of the signal processing means via feed networks 11 and 21, respectively;
specifically, the basic process of operating the simulator as a target simulator includes: the receiving antenna 1 receives electromagnetic wave signals sent by a radar sensor, converts the electromagnetic wave signals into a pair of orthogonal radio frequency signals by combining a feed network 11, amplifies the signals by the low-noise amplifier 3, performs impedance matching of corresponding working frequencies by the matching balun 4, and outputs a pair of processed orthogonal radio frequency signals by the phase shifter 5; meanwhile, tool software at the PC control end sends various parameters of a simulation target to be generated to a micro-control chip 6 of the simulator, and the micro-control chip 6 outputs digital signals conforming to the characteristics of the simulation target according to the parameters; the signal is converted by a digital-to-analog converter 7 into a pair of analog quadrature signals that correspond to the characteristics of the analog target. The pair of signals are mixed with the radio frequency signal through the first mixer 8 and the second mixer 9 respectively, then combined and amplified by a power amplifier, and then circularly polarized electromagnetic waves are generated through the feed network 21 and the transmitting antenna 2 and transmitted to the radar sensor.
To illustrate the design of the rf antenna in more detail, reference is made to fig. 2.
As shown in fig. 2, the front design of the simulator circuit board is shown, wherein the hatched area represents the occupied area of other components and traces, and the upper left and lower right white areas are the clear empty areas of the antenna; the transmitting antenna 1 and the receiving antenna 2 are respectively positioned in two clearance areas, and both adopt regular polygon microstrip patch structures and have a geometric center; the regular polygon may be regular polygon such as equilateral triangle, square, regular pentagon, regular hexagon, regular octagon, etc.; the figure only shows a square as an example. The feed networks 11 and 21 are arranged on the back of the simulator circuit board in a matched manner with the receiving antenna 1 and the transmitting antenna 2.
The receiving antenna 1 and the transmitting antenna 2 are respectively provided with a first feeding point and a second feeding point; the first feeding point and the second feeding point connect the antenna with the corresponding feed network in the form of metal via holes; the distances from the first feeding point and the second feeding point to the geometric center of the corresponding antenna are equal, and the connecting lines of the two feeding points to the geometric center are orthogonal to each other. Therefore, the isolation degree of the two feed points meets the requirement, signals between the two feed points cannot cross each other, and the phase relation between the two feed points is disordered.
In one embodiment, as shown in fig. 3, each feed network is provided with a power divider and a resistor; one end of the power divider is connected with a first feeding point and a second feeding point of the corresponding antenna, and the other end of the power divider is connected with the low-noise amplifier or the power amplifier arranged on the back surface of the simulator circuit board; the resistor bridges a first specific position and a second specific position which are respectively arranged on the transmission sections from the first feeding point and the second feeding point to the power divider respectively, namely, the resistance value of the resistor is the same as the impedance of the transmission belt line.
Specifically, if the feed network is set corresponding to the receiving antenna, one end is connected with the first feed point and the second feed point of the receiving antenna; the other end is connected with a low noise amplifier after being combined by a power divider. If the feed network is arranged corresponding to the transmitting antenna, one end of the feed network is connected with a first feed point and a second feed point of the transmitting antenna; the other end is connected with a power amplifier after being combined through a power divider; preferably, the power divider is a one-to-one second-power divider.
In an embodiment, in order to avoid the distortion that affects the radiation of the antenna and causes the polarization of the radiation of the antenna, the components for processing the relevant radio frequency signals in the doppler microwave radar simulator based on the circular polarization design are all arranged on the back of the circuit board of the simulator, so as to isolate the radiation of the transmission line.
In one embodiment, there are special requirements for each segment of the transmission line length of the feed network.
In order to synthesize an accurate circularly polarized electromagnetic wave, as shown in FIG. 4, the transmission segment length L between the first specific position A and the first feeding point 1 A1 And a transmission segment length L between the second specific position B and the second feeding point 2 B2 The first length relation is satisfied; and corresponds to the transmission section length L between the first specific position A and the power divider D DA And a transmission section length L between the second specific position B and the power divider D DB The second length relation is met to ensure that the phase difference relation of the two feed points is 90 degrees accurately, the power is equal, and the accurate circularly polarized electromagnetic wave is synthesized.
In a specific embodiment, the first length relationship includes:
and wherein lambda is the wavelength of electromagnetic wave in air at the radar working frequency, epsilon is the dielectric constant of the circuit board, and N is a natural number.
And the second length relation is corresponding to the transmission section length L between the first specific position A and the power divider D DA And a transmission section length L between the second specific position B and the power divider D DB Equal.
At this time, the phase difference between the two feeding points is 90 °, the power is equal, the electromagnetic waves excited respectively are a pair of linear polarized waves orthogonal to each other, and the synthesized wave form is a circular polarized wave.
In one embodiment, the transmission length L of the first specific position A from the resistor R to the second specific position B ARB And a transmission section length L corresponding to the first specific position A passing through the power divider D and then reaching the second specific position B ADB The third length relation is satisfied;
wherein the third length relationship comprises:
and wherein lambda is the wavelength of electromagnetic wave in air at the radar working frequency, epsilon is the dielectric constant of the circuit board, and N is a natural number.
At this time, the interference signals of the two paths from A to B can be effectively counteracted, and the signals are ensured to only along L DA +L A1 And L DB +L B2 And the isolation degree of the two feed points is improved. Finally, the phases of the two feeding points are 90 degrees, and the equal power is implemented.
In one embodiment, the simulator circuit board is a multi-layer structure comprising: the antenna layer is provided with a receiving antenna and a transmitting antenna, the feed network layer is provided with a feed network corresponding to the antenna, and the grounding layer is arranged between the antenna layer and the feed network layer to serve as a common reference ground of the antenna and the feed network. The layer insulates transmission line radiation of the feed network from ground so that the radiation of the antenna is not affected and the polarization of the radiation of the antenna is not distorted.
In one embodiment, the ground layer is laid with a monolithic piece of copper foil to serve as a common reference ground for the antenna and the feed network.
Fig. 5 shows a schematic diagram of an application test environment of a microwave radar test system according to an embodiment of the invention.
The system is in an external environment built by wave absorbing materials, comprising:
a plurality of radar sensors 51 to be measured mounted on a tool plane of the fixed tool 01;
a Doppler microwave radar simulator 52 based on circular polarization design installed in the normal direction along the tool plane is used as a target simulator of the test system; it should be noted that, the doppler microwave radar simulator 52 based on the circular polarization design may implement all functions of the doppler microwave radar simulator based on the circular polarization design in the above embodiment, which will not be described in detail.
It should be noted that, in the tool design for testing the radar sensor 51, a mode of spreading along a plane is adopted in most cases, and the target simulator is arranged in a mode of a normal direction of the plane, so that the difference of detection results is small. However, the spreading of the radar sensors 51 is not limited to equidistant spreading, and in theory, the radar sensors 51 may be spaced apart from each other by a certain distance, and no requirement is imposed on the regularity of orientation and arrangement.
The doppler microwave radar simulator 52 based on circular polarization design sequentially converts the received electromagnetic waves emitted by each radar sensor 51 to be detected into a pair of orthogonal radio frequency signals, and sends the corresponding generated circular polarized electromagnetic waves to the corresponding radar sensor 51 for receiving.
Because the mounting position of the radar sensor has non-negligible dislocation relative to the target simulator, signal receiving and transmitting are not strictly transmitted according to the normal direction, so that polarization deflection exists; according to the scheme, the Doppler microwave radar simulator 52 is adopted, signals can be received and transmitted in a mode of reducing half power for any deflected radar electromagnetic wave by circular polarization, and the Doppler microwave radar simulator 52 corresponds to a plurality of radar sensors and can receive and transmit signals with consistent amplitude.
In one embodiment, as shown in fig. 5, the doppler microwave radar simulator 51 is installed in a direction along the normal direction of the tool plane, and is spaced from the tool plane by a distance d. D satisfies a fixed distance relationship;
wherein the fixed distance relationship comprises:
and D is the diagonal length of the radar sensor fixing tool, and lambda is the wavelength in the air corresponding to the electromagnetic wave under the radar working frequency.
In one embodiment, the radar sensor 51 to be measured is a linearly polarized radar sensor for receiving and transmitting linearly polarized electromagnetic waves.
In order to better illustrate the microwave radar test system, the present invention provides the following specific embodiments.
Example 1: a microwave radar test system.
The system comprises: 9 radar sensors to be detected, a target simulator and an external environment built by wave-absorbing materials;
9 radar sensors to be tested are arranged on a fixed tool, and are unfolded in a nine-grid plane as shown in fig. 6; the target simulator adopts a Doppler microwave radar simulator based on circular polarization design, and is arranged in the normal direction along the plane of the tool, the distance from the tool is d, and the d value meets the formula (3);
wherein D is the diagonal length of the fixture for fixing the radar sensor (e.g., the diagonal length of the hatched square in fig. 6), and λ is the wavelength in air corresponding to the electromagnetic wave at the radar operating frequency.
In the application case, the radar sensors are all used for receiving and transmitting linearly polarized electromagnetic waves; as shown in fig. 6, it is assumed that the radar sensor No. 5 is facing the target simulator when installed, and its polarization direction with respect to the simulator is as shown in fig. 7; in this case, the other sensors have a polarization deflection because the mounting positions are not negligibly displaced from the target simulator, and the signal transmission and reception are no longer strictly transmitted in normal direction.
For a simulator of linear polarization design, facing the problem of polarization deflection, only electromagnetic wave components consistent with the self polarization direction can be reserved for receiving and transmitting, and components different from the self direction are abandoned; the proportion of the selection is changed according to different deflection degrees, and finally the magnitude of the received transmitting signal of the simulator is caused to fluctuate.
Under the circular polarization design, as shown in fig. 8, the received and emitted electromagnetic waves of the target simulator can be disassembled into any two equal-amplitude orthogonal linear polarizations, wherein one polarization coincides with the deflected radar electromagnetic wave, and the other is orthogonal to the polarized radar electromagnetic wave; therefore, for any deflected radar electromagnetic wave, circular polarization can transmit and receive signals in a mode of reducing half power, so that the simulator corresponds to a plurality of radar sensors, and signals with consistent amplitude can be transmitted and received.
In the general circular polarization design, the ratio of the magnitudes of two linear polarizations after the circular polarization is split into two orthogonal linear polarizations is called an axial ratio. When the axial ratio is less than or equal to 3dB, the circular polarization design requirement is considered to be met. And fig. 9 shows the axial ratio index of the target simulator in the present solution at each main direction angle, it can be seen that the axial ratio index in the present solution is basically kept below 1dB, and the circular polarization strictness is higher than the general standard.
In summary, according to the doppler microwave radar simulator and the microwave radar test system based on the circular polarization design, the receiving antenna, the transmitting antenna and the signal processing component integrated on the simulator circuit board can accurately receive, modulate and output the target simulation signal, and the strict circular polarization design is utilized, so that the problem of polarization deflection caused by the difference of the spatial arrangement positions of a plurality of radar products to be tested is reduced when the radar products to be tested are simultaneously measured, the measurement error is reduced, and the consistency of the test results is improved.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. It is therefore intended that all equivalent modifications and changes made by those skilled in the art without departing from the spirit and technical spirit of the present invention shall be covered by the appended claims.
Claims (10)
1. A doppler microwave radar simulator based on circular polarization design, comprising:
a receiving antenna, a transmitting antenna and a signal processing part integrated on the simulator circuit board; wherein the signal processing section includes: the low-noise amplifier, the matching balun, the phase shifter, the micro-control chip, the digital-to-analog converter, the first mixer, the second mixer and the power amplifier;
the receiving antenna and the transmitting antenna adopt regular polygon microstrip patch structures and are respectively embedded in the front of the simulator circuit board; a feed network matched with the receiving antenna and the transmitting antenna is respectively arranged on the back of the simulator circuit board; the receiving antenna and the transmitting antenna are respectively provided with a first feeding point and a second feeding point, and the first feeding point and the second feeding point connect the antennas with the corresponding feed networks in the form of metal through holes; the first feeding point and the second feeding point are equal in distance from the geometric center of the corresponding antenna, and connecting lines of the two feeding points to the geometric center are orthogonal to each other;
the receiving antenna converts received electromagnetic waves sent by the radar sensor into a pair of orthogonal radio frequency signals by combining with a corresponding feed network; the transmitting antenna generates circularly polarized electromagnetic waves from signals processed by the orthogonal radio frequency signals through the signal processing component and transmits the circularly polarized electromagnetic waves to the radar sensor through combination with a corresponding feed network.
2. The doppler microwave radar simulator based on circular polarization design according to claim 1, wherein each feed network is provided with a power divider and resistors; one end of the power divider is connected with a first feeding point and a second feeding point of the corresponding antenna, and the other end of the power divider is connected with the low-noise amplifier or the power amplifier arranged on the back surface of the simulator circuit board; the resistor bridges a first specific position and a second specific position which are respectively arranged on the transmission sections from the first feeding point and the second feeding point to the power divider respectively.
3. The doppler microwave radar simulator based on circular polarization design according to claim 2, wherein a first length relation is satisfied between a transmission segment length between the first specific position and a first feeding point and a transmission segment length between the second specific position and a second feeding point, and a second length relation is satisfied between a transmission segment length between the first specific position and the power divider and a transmission segment length between the second specific position and the power divider, so that a phase difference relation between the first feeding point and the second feeding point is exactly 90 ° and power of the first feeding point and the second feeding point is equal.
4. A doppler microwave radar simulator based on a circular polarization design according to claim 3, wherein the first length relation comprises:
and wherein L A1 For the transmission segment length between the first specific position and the first feeding point, L B2 The second path length is lambda is the wavelength of electromagnetic waves in the air at the working frequency of the radar, epsilon is the dielectric constant of the circuit board, and N is a natural number;
the second length relationship includes: the length of the transmission section between the first specific position and the power divider is equal to the length of the transmission section between the second specific position and the power divider.
5. The doppler microwave radar simulator based on circular polarization design according to claim 2, wherein a transmission segment length from the first specific position to the second specific position through a resistor and a transmission segment length from the first specific position to the second specific position through the power divider satisfy a third length relationship;
wherein the third length relationship comprises:
and wherein L ARB For the transmission segment length from the first specific position to the second specific position through the resistor, L ADB And for the length of a transmission section from the first specific position to the second specific position through the power divider, lambda is the wavelength of electromagnetic waves in air at the working frequency of the radar, epsilon is the dielectric constant of the circuit board, and N is a natural number.
6. The doppler microwave radar simulator based on circular polarization design of claim 1, wherein the simulator circuit board is a multilayer structure comprising: the antenna comprises an antenna layer provided with a receiving antenna and a transmitting antenna, a feed network layer provided with a feed network corresponding to the antennas, and a grounding layer arranged between the antenna layer and the feed network layer.
7. The doppler microwave radar simulator based on circular polarization design of claim 6, wherein the ground layer is laid with a monolithic piece of copper foil as a common reference ground for the antenna and the feed network.
8. A microwave radar testing system, the system comprising:
the radar sensors to be tested are respectively arranged on the tool plane of the fixed tool;
a doppler microwave radar simulator based on a circular polarization design as claimed in any one of claims 1 to 7, mounted in a direction normal to the tool plane;
the Doppler microwave radar simulator based on the circular polarization design sequentially converts received electromagnetic waves emitted by all radar sensors to be detected into a pair of orthogonal radio frequency signals respectively, and sends the corresponding generated circular polarization electromagnetic waves to the corresponding radar sensors for receiving.
9. The microwave radar testing system according to claim 8, wherein the distance between the circularly polarized design-based doppler microwave radar simulator and the tool plane satisfies a fixed distance relationship;
wherein the fixed distance relationship comprises:
and D is the distance between the Doppler microwave radar simulator based on circular polarization design and the plane of the tool, D is the diagonal length of the tool for fixing the radar sensor, and lambda is the wavelength in the air corresponding to the electromagnetic wave under the radar working frequency.
10. The microwave radar testing system of claim 8, wherein the radar sensor to be tested is a linearly polarized radar sensor.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116520266A (en) * | 2023-05-04 | 2023-08-01 | 隔空（上海）智能科技有限公司 | Radar target simulator based on mixing mode and microwave radar sensing test system |
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