MIMO radar emission internal calibration method based on antenna full-array emission amplitude-phase data
The MIMO radar's antenna full array transmit amplitude phase data is calibrated internally, and the calibration error and calibration coefficient are calculated, which solves the complexity and time-consuming problems of the calibration process of MIMO radar, and realizes simple and efficient antenna partition calibration, ensuring signal processing function normal operation.
Patent Information
- Application Number
- CN202411316929.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2024-12-27
AI Technical Summary
MIMO radar requires complex circuits and specialized equipment during calibration, which makes the process time-consuming and labor-intensive, and it is difficult to effectively calibrate the relative amplitude and phase relationship between multiple antenna partitions, affecting beamforming and signal processing functions.
The amplitude phase data is emitted by the antenna full array, and the MIMO radar itself is used for internal calibration. The full array excitation signal and partition excitation signal are controlled through the radio frequency selection module, the amplitude phase data is collected, the calibration error and calibration coefficient are calculated, and the compensation is performed to achieve Calibration of partition excitation signal.
The MIMO radar calibration process is simplified, reducing difficulty and time-consuming, improving calibration efficiency, relying solely on the radar's own devices, and no additional design of complex circuits is required, ensuring the normal operation of beamforming and signal processing functions.
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Figure CN119199770A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of airborne MIMO radar transmission amplitude and phase data calibration, and specifically relates to a MIMO radar transmission internal calibration method based on antenna full array transmission amplitude and phase data. Background Art
[0002] Radar antenna calibration technology can effectively reduce the amplitude and phase errors between antenna subunits, thereby improving the detection accuracy and reliability of the radar. The amplitude and phase errors of antenna subunits are mainly caused by the physical characteristics and manufacturing errors of the antenna itself, which will lead to the pointing deviation of the antenna beam and the increase of the sidelobe level, reducing the detection accuracy of the radar.
[0003] In the past, radar antenna calibration usually required measurement, calculation, and compensation. The antenna’s transmit and receive channels were used to measure the amplitude and phase errors of the antenna subunits through full-array excitation, and the error compensation values were calculated. The antenna subunit amplitude and phase were compensated based on the error compensation values.
[0004] MIMO radar achieves spatial diversity and beamforming through multiple transmitting and receiving antennas. Its antenna partition calibration not only calibrates the amplitude and phase errors of a single antenna partition, but also calibrates the relative amplitude and phase relationship between multiple antenna partitions to ensure beamforming and signal processing functions.
[0005] MIMO radar is formed by partitioning traditional phased array radar. Currently, when calibrating it, it is usually necessary to design complex circuits and special equipment, and the process is complicated, time-consuming and labor-intensive. In view of this, the present application is proposed. Summary of the invention
[0006] The purpose of this application is to provide a MIMO radar transmission internal calibration method based on the amplitude and phase data of the full antenna array transmission. By transmitting the phase matching data of the antenna, the relative amplitude and phase relationship between multiple antenna partitions is calibrated to ensure the beam forming and signal processing functions. Only the components of the MIMO radar itself are used for internal calibration, and there is no need to design additional complex circuits and special equipment, which reduces the difficulty of MIMO radar antenna calibration and improves the calibration efficiency.
[0007] The technical solution of this application is:
[0008] A MIMO radar transmission internal calibration method based on full antenna array transmission amplitude and phase data, comprising:
[0009] Step 1: Use the MIMO radar RF selection module to control the full array excitation signal to be input into the drive circulator component, so that the full array excitation signal enters each MIMO partition, and then is transmitted to the power divider through the coupling port of each MIMO partition. The corresponding signal is collected at the narrowband RF receiving point to obtain the amplitude and phase data under the full array excitation.
[0010] Step 2: Control the excitation signal of each MIMO partition to be input into the driving circulator component through the MIMO radar RF selection module, so that the full array excitation signal enters each MIMO partition, and then is transmitted to the power divider through the coupling port of each MIMO partition. The corresponding signal is collected at the narrowband RF receiving point to obtain the amplitude and phase data under the MIMO partition excitation.
[0011] Step 3: Amplitude and phase data based on MIMO partition excitation Amplitude and phase data under full array excitation As a reference benchmark, for comparison, calculate the calibration error of each MIMO partition excitation signal △ i ;
[0012] Step 4: Calibration error △ based on each partition excitation signal i , taking the calibration error of any partition excitation signal as the reference benchmark, compare and calculate the calibration coefficient D of each MIMO partition excitation signal i , where C is the calibration error of any partition excitation signal, so as to compensate each MIMO partition excitation signal at the excitation source.
[0013] According to at least one embodiment of the present application, in the above-mentioned MIMO radar transmission internal calibration method based on the amplitude and phase data of the full antenna array transmission, in step 3, based on the amplitude and phase data under MIMO partition excitation Amplitude and phase data under full array excitation As a reference benchmark, for comparison, calculate the calibration error of each MIMO partition excitation signal △ i , specifically:
[0014]
[0015] According to at least one embodiment of the present application, in the above-mentioned MIMO radar transmission internal calibration method based on the amplitude and phase data of the full antenna array transmission, in step 4, the calibration error △ based on each partition excitation signal i , taking the calibration error of any partition excitation signal as the reference benchmark, compare and calculate the calibration coefficient D of each MIMO partition excitation signal i , specifically:
[0016] D i =△ i / C;
[0017] in,
[0018] C is the calibration error of the excitation signal of any partition.
[0019] According to at least one embodiment of the present application, in the above-mentioned MIMO radar transmission internal calibration method based on full antenna array transmission amplitude and phase data, C=△1;
[0020] in,
[0021] △1 is the calibration error of the first partition excitation signal.
[0022] This application has at least the following beneficial technical effects:
[0023] A MIMO radar transmission internal calibration method based on the antenna full array transmission amplitude and phase data is provided. The antenna full array transmission amplitude and phase data is used as a reference to calculate the error between the existing antenna transmission amplitude and phase data and the transmission calibration signal of different MIMO partitions, and perform antenna MIMO partition transmission internal calibration, which simplifies the complexity of MIMO radar calibration and has the characteristics of simplicity and practicality. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a flow chart of a MIMO radar transmission internal calibration method based on antenna full array transmission amplitude and phase data provided in an embodiment of the present application;
[0025] Figure 2 It is a link diagram of a MIMO radar transmission internal calibration method based on full antenna array transmission amplitude and phase data provided in an embodiment of the present application.
[0026] In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. In addition, the drawings are only used for illustrative purposes and should not be construed as limitations on the present application. DETAILED DESCRIPTION
[0027] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be described in further detail in detail and in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design.
[0028] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application shall have the usual meanings understood by those of ordinary skill in the art to which this application belongs. The words used in the description of this application to indicate orientation are only used to indicate relative directions or positional relationships. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. The word "include" used in the description of this application indicates that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but does not exclude other elements or objects.
[0029] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installation", "connection" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Technical personnel in the field can understand its specific meaning in this application according to the specific circumstances.
[0030] A MIMO radar transmit internal calibration method based on the full array transmit amplitude and phase data, such as Figure 1 shown.
[0031] Step 1: Control the full array excitation signal input to the drive circulator component through the MIMO radar RF selection module, so that the full array excitation signal enters each MIMO partition, that is, the antenna partition, and then transmits it to the power divider through the coupling port of each MIMO partition. The corresponding signal is collected at the narrowband RF receiving point to obtain the amplitude and phase data under the full array excitation. like Figure 2 shown.
[0032] Step 2: Control the excitation signal of each MIMO partition to be input into the driving circulator component through the MIMO radar RF selection module, so that the full array excitation signal enters each MIMO partition, and then is transmitted to the power divider through the coupling port of each MIMO partition. The corresponding signal is collected at the narrowband RF receiving point to obtain the amplitude and phase data under the MIMO partition excitation. like Figure 2 shown.
[0033] Step 3: Amplitude and phase data based on MIMO partition excitation Amplitude and phase data under full array excitation As a reference benchmark, for comparison, calculate the calibration error of each MIMO partition excitation signal
[0034] Step 4: Calibration error △ based on each partition excitation signal i , taking the calibration error of any partition excitation signal as the reference benchmark, compare and calculate the calibration coefficient D of each MIMO partition excitation signal i =△ i / C, where C is the calibration error of any partition excitation signal. By compensating the excitation signal of each MIMO partition at the excitation source, the internal calibration of the MIMO radar transmission can be achieved.
[0035] In a specific example, the antenna subunit is divided into four MIMO partitions, and the MIMO radar transmission internal calibration method based on the antenna full array transmission amplitude and phase data disclosed in the above embodiment is implemented as follows:
[0036] Step 1: Use the MIMO radar RF selection module to control the full array excitation signal to be input from port A to the drive circulator component, so that the full array excitation signal enters the four MIMO partitions, and then is transmitted to the power divider through the coupling ports C1, C2, C3, and C4 of each MIMO partition. Four signals are collected at the narrowband RF receiving point to obtain the amplitude and phase data under full array excitation. i=1,2,3,4.
[0037] Step 2: Use the MIMO radar RF selection module to control the four MIMO partition excitation signals from B1, B2, B3, and B4 to input into the drive circulator component, so that the full array excitation signal enters the four MIMO partitions, and then is transmitted to the power divider through the coupling ports C1, C2, C3, and C4 of the four MIMO partitions. The corresponding signal is collected at the narrowband RF receiving point to obtain the amplitude and phase data under MIMO partition excitation. i=1,2,3,4.
[0038] Step 3: Amplitude and phase data based on MIMO partition excitation Amplitude and phase data under full array excitation As a reference benchmark, for comparison, calculate the calibration error of each MIMO partition excitation signal i=1,2,3,4;
[0039] Step 4: Calibration error △ based on four partition excitation signals i , i = 1, 2, 3, 4, taking the calibration error △1 of the first partition excitation signal as the reference benchmark, compare and calculate the calibration coefficient D of each MIMO partition excitation signal i =△ i / △1,i=1,2,3,4, so as to compensate the excitation signal of each MIMO partition at the excitation source and realize the internal calibration of MIMO radar transmission.
[0040] The MIMO radar transmit internal calibration method based on the antenna full array transmit amplitude and phase data disclosed in the above embodiment uses the antenna full array transmit amplitude and phase data as a reference, calculates the error between the existing antenna transmit amplitude and phase data and the transmit calibration signals of different MIMO partitions, and performs antenna MIMO partition transmit internal calibration, which simplifies the complexity of MIMO radar calibration and has the characteristics of simplicity and practicality.
[0041] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other. In the absence of conflict, the embodiments in this application and the technical features in the embodiments can be combined with each other to obtain new embodiments.
[0042] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the scope of protection of the present application.
Claims
1. A MIMO radar transmission internal calibration method based on full antenna array transmission amplitude and phase data, characterized in that: include: Step 1: Use the MIMO radar RF selection module to control the full array excitation signal to be input into the drive circulator component, so that the full array excitation signal enters each MIMO partition, and then is transmitted to the power divider through the coupling port of each MIMO partition. The corresponding signal is collected at the narrowband RF receiving point to obtain the amplitude and phase data under the full array excitation. Step 2: Control the excitation signal of each MIMO partition to be input into the driving circulator component through the MIMO radar RF selection module, so that the full array excitation signal enters each MIMO partition, and then is transmitted to the power divider through the coupling port of each MIMO partition. The corresponding signal is collected at the narrowband RF receiving point to obtain the amplitude and phase data under the MIMO partition excitation. Step 3: Amplitude and phase data based on MIMO partition excitation Amplitude and phase data under full array excitation As a reference benchmark, for comparison, calculate the calibration error of each MIMO partition excitation signal △ i ; Step 4: Calibration error △ based on each partition excitation signal i , taking the calibration error of any partition excitation signal as the reference benchmark, compare and calculate the calibration coefficient D of each MIMO partition excitation signal i , where C is the calibration error of any partition excitation signal, so as to compensate each MIMO partition excitation signal at the excitation source.
2. The MIMO radar transmission internal calibration method based on antenna full array transmission amplitude and phase data according to claim 1 is characterized in that: In step 3, based on the amplitude and phase data under MIMO partition excitation Amplitude and phase data under full array excitation As a reference benchmark, for comparison, calculate the calibration error of each MIMO partition excitation signal △ i , specifically:
3. The MIMO radar transmission internal calibration method based on antenna full array transmission amplitude and phase data according to claim 1 is characterized in that: In step 4, the calibration error △ based on the excitation signal of each partition i , taking the calibration error of any partition excitation signal as the reference benchmark, compare and calculate the calibration coefficient D of each MIMO partition excitation signal i , specifically: D i =△ i / C; in, C is the calibration error of the excitation signal of any partition.
4. The MIMO radar transmission internal calibration method based on antenna full array transmission amplitude and phase data according to claim 3 is characterized in that: C＝△1； in, △1 is the calibration error of the first partition excitation signal.