CN213581337U - Ka frequency channel millimeter wave radar altimeter - Google Patents
Ka frequency channel millimeter wave radar altimeter Download PDFInfo
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- CN213581337U CN213581337U CN202022937586.8U CN202022937586U CN213581337U CN 213581337 U CN213581337 U CN 213581337U CN 202022937586 U CN202022937586 U CN 202022937586U CN 213581337 U CN213581337 U CN 213581337U
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Abstract
The utility model provides a Ka frequency channel millimeter wave radar altimeter, including first millimeter wave radar chip, second millimeter wave radar chip, first transmitting antenna array, first receiving antenna array, second transmitting antenna array, second receiving antenna array, control circuit and signal processing circuit; the first millimeter wave radar chip is respectively connected with the first transmitting antenna array, the first receiving antenna array, the signal processing circuit and the control circuit; the second millimeter wave radar chip is respectively connected with the second transmitting antenna array, the second receiving antenna array, the signal processing circuit and the control circuit; the utility model discloses an utilize millimeter wave radar chip, two sets of transmitting antenna and two sets of receiving antenna of high integration level for this millimeter wave radar altimeter can realize bigger measuring height when reaching high integration level, small-size, low-power consumption performance.
Description
Technical Field
The utility model relates to a radar technology field especially relates to a Ka frequency channel millimeter wave radar altimeter.
Background
The altimeter mainly comprises a barometric altimeter, a GPS altimeter, an ultrasonic altimeter and a radar altimeter, wherein the altimeter is mainly used for measuring the altitude between the aircraft and the ground at the earliest time, the measurement results of the barometric altimeter and the GPS altimeter are absolute altimeters, and the measurement result of the radar altimeter is the relative altitude between the radar altimeter and the ground; with the development of millimeter wave chip technology, the millimeter wave frequency band has higher available bandwidth, and can realize the advantages of higher resolution and measurement accuracy, higher integration level and the like, so that the millimeter wave radar altimeter is more and more widely applied to various aspects such as unmanned aerial vehicles, helicopters, transport planes, missiles and the like.
The existing radar altimeters can be generally divided into two types, one type is mainly aimed at the market of the micro unmanned aerial vehicle, and has the characteristics of small size and low power consumption, but the measurement height is smaller; and in the other type, the measurement height is larger, but the size is large, the power consumption is large, and the integration level is low.
SUMMERY OF THE UTILITY MODEL
In view of the above prior art's shortcoming, the utility model aims to provide a Ka frequency channel millimeter wave radar altimeter can realize measuring long distance, has the advantage that the size is little, the consumption is little, the integrated level is high simultaneously.
In order to realize above-mentioned purpose and other relevant purposes, the utility model provides a Ka frequency channel millimeter wave radar altimeter, include: the antenna comprises a first millimeter wave radar chip, a second millimeter wave radar chip, a first transmitting antenna array, a first receiving antenna array, a second transmitting antenna array, a second receiving antenna array, a control circuit and a signal processing circuit; a first output end of the first millimeter wave radar chip is connected with the first transmitting antenna array, a first input end of the first millimeter wave radar chip is connected with the first receiving antenna array, a second output end of the first millimeter wave radar chip is connected with a first input end of the signal processing circuit, and a second input end of the first millimeter wave radar chip is connected with a first output end of the control circuit; the first output end of the second millimeter wave radar chip is connected with the second transmitting antenna array, the first input end of the second millimeter wave radar chip is connected with the second receiving antenna array, the second output end of the second millimeter wave radar chip is connected with the second input end of the signal processing circuit, and the second input end of the second millimeter wave radar chip is connected with the second output end of the control circuit.
In an embodiment of the present invention, the first millimeter wave radar chip and the second millimeter wave radar chip are integrated with a transmitting circuit, a receiving circuit, an oscillating circuit, a mixing circuit, and an intermediate frequency amplifying circuit.
In an embodiment of the present invention, the first transmitting antenna array and the first receiving antenna array are respectively connected to the first millimeter wave radar chip through a coplanar waveguide structure; and the second transmitting antenna array and the second receiving array are respectively connected with the second millimeter wave radar chip through a coplanar waveguide structure.
In an embodiment of the present invention, the first transmitting antenna array, the first receiving antenna array, the second transmitting antenna array and the second receiving antenna array all include a microwave array antenna and a feed network, and the microwave array antenna is a single-row microwave array antenna or a multi-row microwave array antenna.
In an embodiment of the present invention, the first transmitting antenna array and the first receiving antenna array are disposed on two sides or the same side of the first millimeter wave radar chip; the second transmitting antenna array and the second receiving antenna array are arranged on two sides or the same side of the second millimeter wave radar chip, and the connecting line direction of the corresponding positions of the first transmitting antenna array and the first receiving antenna array is perpendicular to the connecting line direction of the corresponding positions of the second transmitting antenna array and the second receiving antenna array.
In an embodiment of the present invention, the control circuit includes: the device comprises a frequency modulation module, a phase locking module and a phase synchronization module; the frequency modulation module, the phase locking module and the phase synchronization module are respectively used for carrying out frequency modulation, phase locking and phase synchronization on the transmitting signal of the first millimeter wave radar chip and the transmitting signal of the second millimeter wave radar chip.
In an embodiment of the present invention, the detection angle of the first transmitting antenna array and the first receiving antenna array in the X-axis direction of the rectangular planar coordinate system is greater than the detection angle in the Y-axis direction of the rectangular planar coordinate system; the detection angle of the second transmitting antenna array and the second receiving antenna array in the X-axis direction is smaller than that in the Y-axis direction, so that the detection ranges in the X-axis direction and the Y-axis direction are symmetrical.
In an embodiment of the present invention, the signal processing circuit includes: the device comprises a signal acquisition module and a signal processing module; a first input end of the signal acquisition module is connected with a second output end of the first millimeter wave radar chip and used for acquiring a first output signal of the first millimeter wave radar chip, and a second input end of the signal acquisition module is connected with a second output end of the second millimeter wave radar chip and used for acquiring a second output signal of the second millimeter wave radar chip; the signal processing module is connected with the signal acquisition module and used for processing the first output signal and the second output signal and acquiring height information according to the first output signal and the second output signal.
As above, Ka frequency channel millimeter wave radar altimeter, following beneficial effect has:
compared with the prior art, the utility model discloses an utilize millimeter wave radar chip, two sets of transmitting antenna and two sets of receiving antenna of two high integration levels for this millimeter wave radar altimeter can realize bigger measurement height when reaching high integration level, small-size, low-power consumption performance.
Drawings
Fig. 1 shows a schematic system diagram of the Ka frequency band millimeter wave radar altimeter according to an embodiment of the present invention.
Fig. 2 shows a schematic structural diagram of the Ka frequency band millimeter wave radar altimeter according to an embodiment of the present invention.
Description of the reference symbols
1 a first millimeter wave radar chip;
2 a second millimeter wave radar chip;
3 a first transmit antenna array;
4 a first receive antenna array;
5 a second transmit antenna array;
6 a second receive antenna array;
7 a control circuit;
8 a signal processing circuit.
Detailed Description
The following description is provided for illustrative embodiments of the present invention, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.
The utility model discloses a Ka frequency channel millimeter wave radar altimeter compares with prior art, the utility model discloses an utilize two millimeter wave radar chips, two sets of transmitting antenna and two sets of receiving antenna high integration for this millimeter wave radar altimeter can realize bigger measurement height when reaching high integration, small-size, low-power consumption performance.
As shown in fig. 1, in an embodiment, the Ka band millimeter wave radar altimeter of the present invention includes a first millimeter wave radar chip 1, a second millimeter wave radar chip 2, a first transmitting antenna array 3, a first receiving antenna array 4, a second transmitting antenna array 5, a second receiving antenna array 6, a control circuit 7 and a signal processing circuit 8.
It should be noted that the Ka band, which is a part of the microwave band of the electromagnetic spectrum, has a frequency range of 26.5-40GHz, and Ka represents K-above (K-above), in other words, the Ka band is directly higher than the K band, which is also called 30/20 GHz band, and is generally used for satellite communication.
Specifically, a first output end of the first millimeter wave radar chip 1 is connected to the first transmitting antenna array 3, a first input end of the first millimeter wave radar chip 1 is connected to the first receiving antenna array 4, a second output end of the first millimeter wave radar chip 1 is connected to a first input end of the signal processing circuit 8, and a second input end of the first millimeter wave radar chip 1 is connected to a first output end of the control circuit 7.
Specifically, a first output end of the second millimeter wave radar chip 2 is connected to the second transmitting antenna array 5, a first input end of the second millimeter wave radar chip 2 is connected to the second receiving antenna array 6, a second output end of the second millimeter wave radar chip 2 is connected to a second input end of the signal processing circuit 8, and a second input end of the second millimeter wave radar chip 2 is connected to a second output end of the control circuit 7.
In an embodiment, the first millimeter wave radar chip 1 and the second millimeter wave radar chip 2 are integrated with a transmitting circuit, a receiving circuit, an oscillating circuit, a mixing circuit, and an intermediate frequency amplifying circuit.
It should be noted that this transmitting circuit, receiving circuit, oscillating circuit, mixing circuit and intermediate frequency amplifier circuit are the technical means commonly used in the field, and its specific circuit connection relation and theory of operation do not regard as the restriction the utility model discloses a condition, so, also no longer describe herein.
In an embodiment, the first transmitting antenna array 3 and the first receiving antenna array 4 are respectively connected to the first millimeter wave radar chip 1 through a coplanar waveguide structure; the second transmitting antenna array 5 and the second receiving array are respectively connected with the second millimeter wave radar chip 2 through a coplanar waveguide structure.
It should be noted that, a central conductor strip is manufactured on one surface of the dielectric substrate, and conductor planes are manufactured on two sides adjacent to the central conductor strip, so that a coplanar waveguide, also called a coplanar microstrip transmission line, is formed; the coplanar waveguide transmits TEM wave without cut-off frequency, and the central conductor and the conductor plate are in the same plane, so that it is convenient to install parallel elements on the coplanar waveguide.
In an embodiment, the first transmitting antenna array 3, the first receiving antenna array 4, the second transmitting antenna array 5, and the second receiving antenna array 6 all include a microwave array antenna and a feed network, and the microwave array antenna is a single-row microwave array antenna or a multi-row microwave array antenna.
It should be noted that the directivity of a single antenna is limited, and in order to be suitable for applications in various occasions, two or more than two single antennas working at the same frequency are fed and spatially arranged according to a certain requirement to form an antenna array, also called an antenna array, and antenna radiation units forming the antenna array are called array elements; an array antenna refers to an antenna system, also called an antenna array, formed by a plurality of identical single antennas (e.g. symmetrical antennas) arranged according to a certain rule.
As shown in fig. 2, in an embodiment, the first transmitting antenna array 3 and the first receiving antenna array 4 are disposed on two sides or the same side of the first millimeter wave radar chip 1; the second transmitting antenna array 5 and the second receiving antenna array 6 are disposed on two sides or on the same side of the second millimeter wave radar chip 2, and a connection line direction of corresponding positions of the first transmitting antenna array 3 and the first receiving antenna array 4 is perpendicular to a connection line direction of corresponding positions of the second transmitting antenna array 5 and the second receiving antenna array 6.
Further, the first millimeter wave radar chip 1 and the second millimeter wave radar chip 2 are integrated on the same circuit board (as shown in fig. 2, the circuit board is not labeled in fig. 2).
In one embodiment, the control circuit 7 includes a frequency modulation module, a phase locking module and a phase synchronization module; the frequency modulation module, the phase locking module and the phase synchronization module are respectively used for carrying out frequency modulation, phase locking and phase synchronization on the transmitting signal of the first millimeter wave radar chip 1 and the transmitting signal of the second millimeter wave radar chip 2.
It should be noted that, this frequency modulation module, phase-locked module and phase synchronization module are the technical means commonly used in the field, and its specific circuit connection relation and theory of operation do not regard as the restriction the utility model discloses a condition, so, also no longer give consideration to here.
It should be noted that the control circuit 7 is configured to control the first millimeter wave radar chip 1 and the second millimeter wave radar chip 2 to generate frequency modulation signals, and synchronize phases of signals transmitted by the first millimeter wave radar chip 1 and the second millimeter wave radar chip 2, so as to achieve a larger measurement height under the condition that a detection range is satisfied.
In an embodiment, the detection angle of the first transmitting antenna array 3 and the first receiving antenna array 4 in the X-axis direction of the rectangular planar coordinate system is greater than the detection angle in the Y-axis direction of the rectangular planar coordinate system; the detection angle of the second transmitting antenna array 5 and the second receiving antenna array 6 in the X-axis direction is smaller than the detection angle in the Y-axis direction.
It should be noted that, through the two antenna arrays, the symmetry of the detection ranges of the Ka-band millimeter wave radar altimeter in the X-axis direction and the Y-axis direction is realized.
In an embodiment, the signal processing circuit 8 includes a signal acquisition module and a signal processing module.
Specifically, the first input end of the signal acquisition module is connected with the second output end of the first millimeter wave radar chip 1 and used for acquiring the first output signal of the first millimeter wave radar chip 1, and the second input end of the signal acquisition module is connected with the second output end of the second millimeter wave radar chip 2 and used for acquiring the second output signal of the second millimeter wave radar chip 2.
Specifically, the signal processing module is connected to the signal acquisition module, and is configured to process the first output signal and the second output signal, and acquire height information according to the first output signal and the second output signal.
It should be noted that the basic principle of the radar altimeter is to obtain altitude information by measuring the time delay between the echo signal and the transmitted signal, and the signal processing module may obtain the relevant time delay information by performing two-dimensional fourier transform FFT and CFAR constant false alarm algorithm processing on the first output signal and the second output signal, so as to obtain altitude information higher than altitude information obtained by solely depending on the first output signal or the second output signal.
It should be noted that, this constant false alarm algorithm of two-dimensional fourier transform FFT and CFAR is the common technical means in the field, and it does not regard as the restriction the utility model discloses a condition, so, do not again here to its theory of operation detailed description.
It should be noted that, this signal acquisition module and signal processing module are the technical means commonly used in the field, and its specific circuit connection relation and theory of operation do not regard as the restriction the utility model discloses a condition, so, also give unnecessary details here.
It should be noted that, because the Ka frequency range millimeter wave radar altimeter includes two millimeter wave radar chips, two sets of transmitting antennas and two sets of receiving antennas, under the control of the control circuit 7, a larger radiation power and a larger receiving gain can be realized, so that the Ka frequency range millimeter wave radar altimeter still has a sufficient signal-to-noise ratio of the first output signal and the second output signal at a larger altitude, thereby realizing a larger measurement altitude.
To sum up, compared with the prior art, the Ka-band millimeter wave radar height gauge of the utility model utilizes two high-integration millimeter wave radar chips, two sets of transmitting antennas and two sets of receiving antennas, so that the millimeter wave radar height gauge can realize larger measurement height while achieving high integration, small size and low power consumption performance; therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. A Ka frequency range millimeter wave radar altimeter, comprising: the antenna comprises a first millimeter wave radar chip, a second millimeter wave radar chip, a first transmitting antenna array, a first receiving antenna array, a second transmitting antenna array, a second receiving antenna array, a control circuit and a signal processing circuit;
a first output end of the first millimeter wave radar chip is connected with the first transmitting antenna array, a first input end of the first millimeter wave radar chip is connected with the first receiving antenna array, a second output end of the first millimeter wave radar chip is connected with a first input end of the signal processing circuit, and a second input end of the first millimeter wave radar chip is connected with a first output end of the control circuit;
the first output end of the second millimeter wave radar chip is connected with the second transmitting antenna array, the first input end of the second millimeter wave radar chip is connected with the second receiving antenna array, the second output end of the second millimeter wave radar chip is connected with the second input end of the signal processing circuit, and the second input end of the second millimeter wave radar chip is connected with the second output end of the control circuit.
2. The Ka-band millimeter wave radar altimeter of claim 1, wherein a transmitting circuit, a receiving circuit, an oscillating circuit, a mixing circuit and an intermediate frequency amplifying circuit are integrated on each of the first millimeter wave radar chip and the second millimeter wave radar chip.
3. The Ka-band millimeter wave radar altimeter of claim 1, wherein the first transmit antenna array and the first receive antenna array are connected to the first millimeter wave radar chip through coplanar waveguide structures, respectively; and the second transmitting antenna array and the second receiving array are respectively connected with the second millimeter wave radar chip through a coplanar waveguide structure.
4. The Ka-band millimeter wave radar altimeter of claim 1, wherein the first transmit antenna array, the first receive antenna array, the second transmit antenna array, and the second receive antenna array each comprise a microwave array antenna and a feed network, and the microwave array antenna is a single-row microwave array antenna or a multi-row microwave array antenna.
5. The Ka-band millimeter wave radar altimeter of claim 1, wherein the first transmit antenna array and the first receive antenna array are disposed on either side or on the same side of the first millimeter wave radar chip; the second transmitting antenna array and the second receiving antenna array are arranged on two sides or the same side of the second millimeter wave radar chip, and the connecting line direction of the corresponding positions of the first transmitting antenna array and the first receiving antenna array is perpendicular to the connecting line direction of the corresponding positions of the second transmitting antenna array and the second receiving antenna array.
6. The Ka-band millimeter wave radar altimeter of claim 1, wherein the control circuit comprises: the device comprises a frequency modulation module, a phase locking module and a phase synchronization module; the frequency modulation module, the phase locking module and the phase synchronization module are respectively used for carrying out frequency modulation, phase locking and phase synchronization on the transmitting signal of the first millimeter wave radar chip and the transmitting signal of the second millimeter wave radar chip.
7. The Ka-band millimeter wave radar altimeter of claim 1, wherein a detection angle of the first transmit antenna array and the first receive antenna array in an X-axis direction of a planar rectangular coordinate system is greater than a detection angle in a Y-axis direction of the planar rectangular coordinate system; the detection angle of the second transmitting antenna array and the second receiving antenna array in the X-axis direction is smaller than that in the Y-axis direction, so that the detection ranges in the X-axis direction and the Y-axis direction are symmetrical.
8. The Ka-band millimeter wave radar altimeter of claim 1, wherein the signal processing circuit comprises: the device comprises a signal acquisition module and a signal processing module; wherein the content of the first and second substances,
a first input end of the signal acquisition module is connected with a second output end of the first millimeter wave radar chip and is used for acquiring a first output signal of the first millimeter wave radar chip, and a second input end of the signal acquisition module is connected with a second output end of the second millimeter wave radar chip and is used for acquiring a second output signal of the second millimeter wave radar chip;
the signal processing module is connected with the signal acquisition module and used for processing the first output signal and the second output signal and acquiring height information according to the first output signal and the second output signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022937586.8U CN213581337U (en) | 2020-12-10 | 2020-12-10 | Ka frequency channel millimeter wave radar altimeter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022937586.8U CN213581337U (en) | 2020-12-10 | 2020-12-10 | Ka frequency channel millimeter wave radar altimeter |
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| CN213581337U true CN213581337U (en) | 2021-06-29 |
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| CN202022937586.8U Active CN213581337U (en) | 2020-12-10 | 2020-12-10 | Ka frequency channel millimeter wave radar altimeter |
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