Frequency-phase MIMO hybrid digital array radar detection system

Abstract

The invention discloses a frequency-phase MIMO hybrid digital array radar detection system, and the system comprises a frequency-phase MIMO integrated antenna module which is used for enabling a radio-frequency signal to be radiated to a specified direction of a free space after beamforming during transmission, receiving a signal in a characteristic beam direction in the free space during receiving, and outputting the signal to an integrated channel module; the integrated channel module is used for down-converting the received radio frequency signal to the intermediate frequency and up-converting the intermediate frequency signal to the radio frequency; the high-speed signal processor is used for generating an intermediate-frequency excitation signal, receiving an intermediate-frequency signal and processing the intermediate-frequency signal to complete target detection and tracking; and the secondary power supply module is used for converting power supply voltage provided by the outside and supplying power to each module. According to the technical scheme, the radar detection system is miniaturized and low in cost, and has higher survivability and anti-interference ability.

Description

Technical Field

[0001] The present invention relates to the field of radar detection technology, and in particular to a frequency-phase MIMO hybrid digital array radar detection system. Background Art

[0002] The radar detection system is an electronic system that can search, intercept and track targets, and has certain anti-interference and clutter suppression capabilities. The structural module of the radar detection system controls the antenna to radiate electromagnetic waves to the target in a specific beam direction according to predetermined information instructions, and measures the target's angle, speed, distance and other information after receiving the echo signal reflected by the target, thereby realizing the detection and tracking of the target.

[0003] At present, most radar detection systems use phased array systems. Each array element of the phased array radar transmits a signal with the same frequency. By connecting a phase shifter at the output end of each array element to control the beam direction, the spatial scanning of the beam can be achieved by adjusting the phase shift of the phase shifter. At present, as a fully digital array radar, the phased array radar uses digital beam synthesis technology in both the transmit and receive modes, and supports adaptive processing of digital signals. Therefore, it has unique advantages in spatial anti-interference. Through signal processing in the digital domain, many advanced spatial adaptive filtering algorithms can be realized. The receive beam synthesis can more flexibly form adaptive nulls in the interference direction, while suppressing multiple interference signals in space, effectively improving the survivability of the phased array radar in complex electromagnetic environments, and thus becoming one of the current focuses of radar anti-interference. For active interference signals from the sidelobe direction, the phased array radar detection system can effectively suppress them by using anti-sidelobe interference technologies such as ultra-low sidelobe antennas, sidelobe blanking, sidelobe cancellation or adaptive sidelobe nulling. These technologies have been widely used in actual engineering and have achieved good results, basically solving the sidelobe interference problem of radar detection systems. On the other hand, radar detection systems also include MIMO (Multiple-Input Multiple-Output) systems. The antenna arrangement of MIMO radars is similar to that of phased arrays, and can be regarded as a derivative of phased arrays. This type of MIMO radar has a smaller distance between array elements, and the waveform of each transmitted signal can be freely designed. Compared with phased array radars, MIMO radars have higher resolution, more accurate parameter resolution and sensitivity. Therefore, compared with traditional phased array radars, the biggest advantage of MIMO radars is that waveform diversity can be used to improve system performance. Since the array elements of MIMO radars transmit unrelated signals to each other, the transmitted waveform cannot synthesize a high-gain narrow beam, but receives multiple beams while jointly forming a low-gain wide beam, so the resolution is also significantly improved. Frequency Diverse Array (FDA) radars transmit coherent signals like phased array radars. The carrier frequencies of adjacent array elements have a frequency increment (the frequency increment is much smaller than the carrier frequency), which results in the frequency array array factor having both angle and distance dependence, thus having the ability to suppress main lobe interference. At the same time, the distance-angle coupling and time-varying characteristics of the frequency-controlled array transmit beam can greatly increase the difficulty of positioning and solving the passive detection technology, and cause the opponent's passive detection equipment to have a serious detection deviation, which is a "positioning deception" effect.

[0004] However, single-system radar detection systems have their limitations: the defects of phased array radar detection systems are: first, although the use of spatial filtering has a good suppression effect on sidelobe interference, this interference suppression method is difficult to combat mainlobe interference; second, it uses a narrow mainlobe beam and a low sidelobe peak to achieve RF stealth technology, but the phased array beam control technology it uses can only control the radiation characteristics of the angle dimension, and cannot effectively control the distance dimension characteristics, making it easy for the enemy to detect and locate it, resulting in insufficient RF stealth of the phased array detection system; third, when detecting low-altitude targets, it will face serious clutter and multipath interference. , the existing clutter suppression technology based on space-time processing or transform domain processing is difficult to solve the problem of fuzzy clutter or multipath interference suppression, resulting in insufficient low-altitude target detection capabilities; fourth, most of them adopt a brick-type antenna architecture, which has problems such as large size and weight, high cost, and it is difficult to meet the needs of miniaturization, low cost, and large-scale production; while the frequency-controlled array radar detection system can suppress main lobe interference, the distance-angle coupling problem will cause the detection target to be blurred; although the MIMO radar detection system has multiple degrees of freedom in the spatial domain, it lacks transmit array gain and it is difficult to achieve multiple large time-bandwidth product orthogonal waveforms.

[0005] Therefore, a technical solution is needed to address the problems of existing radar detection systems' lack of main lobe interference resistance, RF stealth capability and low-altitude clutter suppression capability, as well as the difficulty of existing multi-channel radar detection systems to meet the requirements of miniaturization, low cost and large-scale production. Summary of the invention

[0006] To achieve the above objectives, the present application provides a frequency-phase MIMO hybrid digital array radar detection system, comprising:

[0007] Frequency-phase MIMO integrated antenna module: It is composed of twelve identical sub-arrays, which are used to realize beam synthesis and radiation of RF signals to a specified direction in free space when the sub-arrays transmit, and to receive signals returned from the target in a specified direction in free space when receiving, amplify the signals through the receiving channel of the T / R chip, and output them to the integrated channel module through the microwave interface;

[0008] Integrated channel module: The integrated channel module includes twelve independent receiving channels, twelve transmitting channels, one transmitting calibration channel, one receiving calibration channel and a frequency synthesis source; the integrated channel module is used to realize the down-conversion of the received RF signal to the intermediate frequency and transmit it to the high-speed signal processor, and up-convert the intermediate frequency signal to the RF and transmit it to the antenna feed system;

[0009] High-speed signal processor: used to generate intermediate frequency linear frequency modulation pulse signals, receive intermediate frequency echo signals, perform consistency calibration of amplitude and phase between channels, adaptive digital beam synthesis and pulse compression, complete coherent accumulation and CFAR detection, and calculate target points to achieve single-target and multi-target detection and tracking; the high-speed signal processor includes a frequency-phase MIMO encoding unit, which is used to switch the working mode, and the working modes include: phased array radar mode, frequency-controlled array radar mode and MIMO radar mode.

[0010] Secondary power supply module: used to convert the externally provided power supply voltage and provide it to each module of the frequency-phase MIMO hybrid digital array radar detection system.

[0011] When the frequency-phase MIMO encoding module switches the working mode to the phased array radar mode, the twelve sub-arrays in the frequency-phase MIMO integrated antenna module work together in a phased manner;

[0012] When the frequency-phase MIMO encoding module switches the working mode to the frequency-controlled array radar mode, there is a frequency difference between the center frequencies of the twelve sub-arrays in the frequency-phase MIMO integrated antenna module;

[0013] When the frequency-phase MIMO coding module switches the working mode to the MIMO radar mode, the signals of the twelve sub-arrays in the frequency-phase MIMO integrated antenna module are orthogonal to each other through frequency bands or coding.

[0014] The frequency-phase MIMO coding unit switches the working mode through array element waveform and frequency deviation.

[0015] Furthermore, when the switching of the working mode is realized, when the frequency-phase MIMO encoding unit controls all frequency deviations of the transmitted signals to be equal to zero and the transmitting baseband waveforms are the same, the working mode is switched to the phased array radar mode;

[0016] When the frequency-phase MIMO encoding unit controls all the frequency deviations of the transmitted signals to be unequal and the transmitted baseband waveforms are the same, the working mode is switched to the frequency-controlled array radar mode;

[0017] When the frequency-phase MIMO encoding unit controls all frequency deviations of the transmitted signals to be equal to zero or the frequency deviations of the transmitted signals are not all equal and the transmitted baseband waveforms are orthogonal, the working mode is switched to the MIMO radar mode.

[0018] When the number of array elements is 1, the working mode is a basic single antenna mode.

[0019] Furthermore, when the working mode is the phased array radar mode: the radar transmits twelve completely identical sub-array signals, the waveform generator generates a transmitting intermediate frequency signal, which is amplified and filtered by the integrated channel module, and then the frequency is multiplied to obtain a radio frequency transmitting signal, which is radiated into space through the frequency-phase MIMO integrated transmitting antenna array;

[0020] During reception, the signals received by the twelve sub-array receiving antennas are mixed with the transmit coupled signals and down-converted into intermediate frequency signals, which are then amplified and enter the high-speed signal processor; the high-speed signal processor performs AD sampling and data storage, and after range pulse compression + MTD digital signal processing and CFAR processing, completes target detection, extracts range and speed information, obtains target azimuth information, and tracks the target through the tracking loop.

[0021] When the working mode is frequency-controlled array radar mode: the radar transmits twelve sub-array signals with different carrier frequencies, and the waveform generator of the high-speed signal processor generates a transmitting intermediate frequency signal. The intermediate frequency signal is mixed, amplified and filtered by the local oscillator of the intermediate frequency module, and then the frequency is multiplied to obtain the radio frequency transmission signal, which is radiated into space through the frequency-phase MIMO integrated transmitting antenna array.

[0022] When the working mode is MIMO radar mode, the radar transmits twelve orthogonally coded sub-array signals, and the waveform generator of the high-speed signal processor transmits the intermediate frequency signal; the intermediate frequency signal is orthogonally encoded, and the intermediate frequency module local oscillator mixing, amplification, filtering, and frequency multiplication generates a radio frequency transmission signal, which is radiated into space through the frequency-phase MIMO integrated transmitting antenna array.

[0023] When the working mode is the frequency-controlled array radar mode, a transmitting beam brought by different carrier frequencies is used between transmitting array elements, and the transmitting beam has the characteristics of spatial agility, time agility, frequency agility, and waveform agility;

[0024] Among them, spatial agility refers to the fact that the transmitting beam has a joint range-azimuth dependency;

[0025] Frequency agility means that each array element can use a different center carrier frequency;

[0026] Time agility refers to the time-varying electromagnetic propagation interference effect caused by the simultaneous transmission of different carrier frequency waveforms;

[0027] Waveform agility means that each transmitting array element can transmit different orthogonal or non-orthogonal waveforms.

[0028] Furthermore, the frequency-phase MIMO integrated antenna module is implemented by a surface-mount multi-channel array antenna method based on an antenna on a package; the surface-mount multi-channel array antenna method includes two dimensions: process chip and 3D packaging; in the process chip dimension, a phased array multi-channel T / R chip is used to achieve high integration and chipization of transceiver components; in the 3D packaging dimension, the chip, package and antenna in the phased array antenna are interconnected to form an antenna sub-array on the package.

[0029] According to the solution provided by the present invention, different working modes can be selected only through software definition, thereby reducing the hardware cost of the system, and having the characteristics of small size, light weight and low cost; at the same time, the frequency-phase MIMO hybrid digital array radar detection system provided by the present invention is not easy to be detected and has stronger survivability; it has agile parameters in spatial dimension, time dimension and distance dimension, has stronger anti-interference ability, and can suppress the main lobe interference with the same azimuth as the target but close distance; it can effectively enhance the radar seeker's suppression ability of strong clutter and multipath interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of a frequency-phase MIMO hybrid digital array radar detection system provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The frequency-phase MIMO hybrid digital array radar detection system provided by the present invention is an integrated design of radars of phased array radar detection, frequency-controlled array radar detection and MIMO radar detection systems. Since both frequency-controlled array and MIMO radar need to transmit multiple transmission signals, the use of multiple sub-arrays is considered when designing the system architecture to simultaneously realize the transmission and reception requirements of three different radar system signals.

[0032] The frequency-phase MIMO hybrid digital array radar detection system provided by the present invention is based on digital phased array radar hardware and system architecture, and comprehensively adopts multi-dimensional joint transmission and coherent receiving technology such as space, time, frequency and waveform. Among them, the frequency-phase MIMO hybrid digital array includes phased array, frequency controlled array (FDA), MIMO radar and FDA-MIMO, which has good universality and generality, and can make the working frequency bands of various working systems consistent. Through the design of multiple sub-arrays, the entire hardware can realize resource sharing in antennas, radio frequency channels, sampling, signal processing and other parts, and perform integrated design.

[0033] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings.

[0034] The frequency-phase MIMO hybrid digital array radar detection system of the present invention is mainly composed of a frequency-phase MIMO integrated antenna module, an integrated channel module, a high-speed signal processor and a secondary power supply module. Figure 1 As shown, including:

[0035] P100 frequency-phase MIMO integrated antenna module: The frequency-phase MIMO integrated antenna module consists of twelve identical sub-arrays, which are used to process the excitation signal and radiate it into free space when the sub-array is transmitting, and receive the signal from free space when receiving, process the signal, and output it to the integrated channel module;

[0036] Specifically, the functions of the frequency-phase MIMO integrated antenna module are reflected in two aspects: sending signals and receiving signals: when each sub-array transmits, the excitation signal enters the antenna board through the microwave interface, is amplified, power-divided, amplitude-modulated and phase-modulated through the T / R chip, and finally radiated into the free space by the antenna on the array surface; when receiving, the signal received by the antenna from the free space is amplified by the receiving channel of the T / R chip, and then the amplitude and phase controller controls the amplitude and phase of each signal, and outputs it to the integrated channel module through the microwave interface.

[0037] The frequency-phase MIMO integrated antenna adopts surface-mount multi-channel array antenna technology based on packaged antenna; this technology is reflected in two dimensions: chip process and chip packaging;

[0038] At the chip technology level, a phased array multi-channel T / R chip design is adopted to achieve high integration and chip-based transceiver components while ensuring detection performance. At the chip 3D packaging and interconnection level, the chip, package and antenna interconnection in the phased array antenna are used to form an antenna-on-package (AOP) sub-array module, which is then integrated into a surface-mount phased array antenna in the form of "building blocks". It has the characteristics of high integration, small size and light weight.

[0039] P110 integrated channel module: The integrated channel module includes: twelve independent receiving channels, twelve transmitting channels, one transmitting calibration channel, one receiving calibration channel and frequency synthesis source; the integrated channel module is used to realize the down-conversion of the received RF signal to the intermediate frequency and transmit it to the high-speed signal processor, and up-convert the intermediate frequency signal to the RF and radiate it into the free space through the antenna feed system;

[0040] P120 high-speed signal processor: used to generate 12-channel intermediate frequency linear frequency modulation pulse signals with linear frequency deviation, receive intermediate frequency echo information, and perform consistency calibration, adaptive digital beam synthesis and pulse compression on the 12-channel amplitude and phase, complete coherent accumulation and CFAR detection, and then calculate target point traces to achieve single-target and multi-target detection and tracking;

[0041] Specifically, each receiving channel receives echo signals from 12 transmitting channels, completes digital down-conversion, signal extraction, amplitude and phase consistency calibration of 12 channels, adaptive digital beamforming, completes pulse compression, coherent accumulation and CFAR target detection for multiple channels, and calculates target point traces; therefore, the high-speed signal processor has multi-wave position search, distance search within a specified range, search-intercept-track processing functions; and can realize single-target or multi-target detection and tracking.

[0042] The high-speed signal processor comprises a frequency-phase MIMO coding unit, and the frequency-phase MIMO coding unit realizes the switching of the working mode through the array element waveform and the frequency deviation for switching the working mode.

[0043] P130 secondary power supply module: used to convert the externally provided power supply voltage and provide it to each module of the frequency-phase MIMO hybrid digital array radar detection system.

[0044] The operating modes supported by the frequency-phase MIMO hybrid digital array radar detection system of the present invention include: phased array radar mode, frequency-controlled array radar mode and MIMO radar mode:

[0045] 1) Phased array radar mode: When the frequency-phase MIMO encoding unit controls the transmitted signal so that all frequency deviations are equal to zero and the transmitted baseband waveforms are the same, the working mode is switched to the phased array radar mode; at this time, the twelve sub-arrays in the frequency-phase MIMO integrated antenna module work together in a phased manner.

[0046] When the working mode is phased array radar mode: the radar transmits twelve identical sub-array signals, the waveform generator generates a transmitting intermediate frequency signal, which is amplified and filtered by the integrated channel module, and then the frequency is multiplied to obtain the radio frequency transmitting signal, which is radiated into space through the frequency-phase MIMO integrated transmitting antenna array;

[0047] When receiving in phased array radar mode, the signals received by the twelve sub-array receiving antennas are mixed with the transmit coupled signals and down-converted into intermediate frequency signals, which are amplified and enter the high-speed signal processor; the high-speed signal processor performs AD sampling and data storage, and after range pulse compression + MTD digital signal processing and CFAR processing, completes target detection, extracts distance and speed information, obtains target azimuth information, and tracks the target through the tracking loop.

[0048] 2) Frequency-controlled array radar mode: When the frequency-phase MIMO encoding unit controls the transmitted signals to have unequal frequency deviations and the transmitted baseband waveforms are the same, the working mode is switched to the frequency-controlled array radar mode; at this time, there is a small frequency difference between the center frequencies of the twelve sub-arrays in the frequency-phase MIMO integrated antenna module.

[0049] When the working mode is frequency-controlled array radar mode: the radar transmits twelve sub-array signals with different carrier frequencies, and the waveform generator in the high-speed signal processor generates a transmitting intermediate frequency signal. The intermediate frequency signal is mixed, amplified and filtered by the local oscillator of the intermediate frequency module, and then the frequency is multiplied to obtain the RF transmission signal, which is radiated into space through the frequency-phase MIMO integrated transmitting antenna array.

[0050] When the working mode is the frequency-controlled array radar mode, different carrier frequency bands are used between the transmitting array elements to transmit the beam, and the transmitting beam has the characteristics of space agility, time agility, frequency agility and waveform agility.

[0051] Specifically, the spatial agility feature refers to the fact that the transmit beam has a joint range-azimuth dependency;

[0052] The frequency agility feature means that each array element can use a different center carrier frequency;

[0053] The time-agile characteristic refers to the time-varying electromagnetic propagation interference effect caused by the simultaneous transmission of different carrier frequency waveforms;

[0054] The waveform agility feature means that each transmitting array element can transmit different orthogonal or non-orthogonal waveforms.

[0055] 3) MIMO radar mode: When the frequency-phase MIMO coding unit controls all frequency deviations of the transmitted signals to be equal to zero or the frequency deviations of the transmitted signals are not all equal and the transmitted baseband waveforms are orthogonal, the working mode is switched to MIMO radar mode; at this time, the signals of the twelve sub-arrays are orthogonal to each other through frequency bands or coding.

[0056] When the working mode is MIMO radar mode, the radar transmits twelve orthogonally coded sub-array signals, and the waveform generator of the high-speed signal processor transmits the intermediate frequency signal. The intermediate frequency signal is orthogonally encoded, and the intermediate frequency module local oscillator is mixed, amplified, filtered, and multiplied to generate a radio frequency transmission signal, which is radiated into space through the frequency-phase MIMO integrated transmitting antenna array.

[0057] However, when the frequency deviations of the transmitted signals are not all equal and the transmitted baseband waveforms are orthogonal, the universal model degenerates into FDA-MIMO.

[0058] 4) When there is only one array element, the universal model degenerates into a basic single-antenna (i.e., single-input-single-output) mode.

[0059] It can be seen that through the solution of the present invention, by software definition and selection of different array element waveforms and frequency offsets, the frequency-phase MIMO hybrid array radar with universality and multi-function can realize different radar systems, which also means that waveform design and selection are the core parameters that determine the system and function of the frequency-phase MIMO hybrid array radar.

[0060] Compared with the prior art, the present invention has the following advantages:

[0061] a) Due to the interference effect of electromagnetic propagation of the transmitted signal of the frequency-phase MIMO hybrid digital array radar detection system, the multi-dimensional joint transmission signal of space, time, frequency and waveform will form a complex "interference bending" phenomenon of distance, azimuth and time dependence in space, which is easy to cause positioning inaccuracy (positioning deception characteristics) of passive detection technology. Therefore, the frequency-phase MIMO hybrid digital array radar detection system is not easy to be detected and has stronger survivability;

[0062] b) Compared with conventional phased array radar seekers, the frequency-phase MIMO hybrid digital array radar detection system has increased agile parameters in the spatial, temporal and distance dimensions, and thus has stronger anti-interference capabilities. In particular, it can utilize its multi-dimensional target response characteristics to suppress main lobe interference with the same azimuth as the target but with a similar distance dimension.

[0063] c) The frequency-phase MIMO hybrid digital array radar detection system beam has distance-dependent characteristics and space-varying and time-varying characteristics, which helps to separate and suppress distance-ambiguous clutter and can effectively improve the radar seeker's ability to suppress strong clutter and multipath interference;

[0064] d) The frequency-phase MIMO hybrid digital array radar detection system adopts an integrated hardware system architecture of phased array and frequency-controlled array, and is compatible with frequency-controlled array, phased array, and MIMO modes working simultaneously, individually, or collaboratively, sharing antennas, RF channels, data acquisition and processing resources, and can select different working modes simply through software definition, thereby reducing the system hardware cost;

[0065] e) The antenna of the frequency-phase MIMO hybrid digital array radar detection system adopts surface-mount multi-channel array antenna technology based on phased array multi-channel T / R chip. Its chip, package and antenna are interconnected to form an AOP sub-array module, which is integrated into a surface-mount phased array antenna in the form of "building blocks". It has the characteristics of small size, light weight and low cost.

[0066] The above disclosures are only several specific embodiments of the present invention; however, the present invention is not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A frequency-phase MIMO hybrid digital array radar detection system, characterized in that: include: Frequency-phase MIMO integrated antenna module: The frequency-phase MIMO integrated antenna module is composed of twelve identical sub-arrays, which are used to realize beam synthesis of radio frequency signals and radiate them to a specified direction in free space when the sub-arrays transmit, and to receive signals returned from the target in a specified direction in free space when receiving, amplify the signals through the receiving channel of the T / R chip, and output them to the integrated channel module through the microwave interface; Integrated channel module: The integrated channel module includes: twelve independent receiving channels, twelve transmitting channels, one transmitting calibration channel, one receiving calibration channel and a frequency synthesis source; the integrated channel module is used to realize the down-conversion of the received RF signal to the intermediate frequency and transmit it to the high-speed signal processor, and up-convert the intermediate frequency signal to the RF and transmit it to the antenna feed system; High-speed signal processor: used to generate intermediate frequency linear frequency modulation pulse signals and receive intermediate frequency echo signals. At the same time, it performs consistency calibration, adaptive digital beam synthesis and pulse compression on the amplitude and phase of 12 channels, completes coherent accumulation and CFAR detection, and calculates target points to achieve single-target and multi-target detection and tracking; the high-speed signal processor includes a frequency-phase MIMO encoding unit, which is used to switch the working mode, and the working modes include: phased array radar mode, frequency-controlled array radar mode and MIMO radar mode. Secondary power supply module: used to convert the externally provided power supply voltage and provide it to each module of the frequency-phase MIMO hybrid digital array radar detection system.

2. The frequency-phase MIMO hybrid digital array radar detection system according to claim 1, characterized in that: When the frequency-phase MIMO encoding module switches the working mode to the phased array radar mode, the twelve sub-arrays in the frequency-phase MIMO integrated antenna module work together in a phased array manner; When the frequency-phase MIMO encoding module switches the working mode to the frequency-controlled array radar mode, there is a frequency difference between the center frequencies of the twelve sub-arrays in the frequency-phase MIMO integrated antenna module; When the frequency-phase MIMO encoding module switches the working mode to the MIMO radar mode, the signals of the twelve sub-arrays in the frequency-phase MIMO integrated antenna module are orthogonal to each other through frequency bands or coding.

3. The frequency-phase MIMO hybrid digital array radar detection system according to claim 1, characterized in that: The frequency-phase MIMO encoding unit realizes the switching of the working mode through the array element waveform and the frequency deviation.

4. The frequency-phase MIMO hybrid digital array radar detection system according to claim 3, characterized in that: When the switching of the working mode is realized, the frequency-phase MIMO encoding unit controls all frequency deviations of the transmitted signals to be equal to zero and the transmitted baseband waveforms are the same, and the working mode is switched to the phased array radar mode; When the frequency-phase MIMO encoding unit controls all frequency deviations of the transmitted signals to be unequal and the transmitted baseband waveforms to be the same, the working mode is switched to the frequency-controlled array radar mode; When the frequency-phase MIMO encoding unit controls all frequency deviations of the transmitted signals to be equal to zero or the frequency deviations of the transmitted signals are not all equal and the transmitted baseband waveforms are orthogonal, the working mode is switched to the MIMO radar mode.

5. The frequency-phase MIMO hybrid digital array radar detection system according to claim 3, characterized in that: When the number of array elements is 1, the working mode is a basic single antenna mode.

6. The frequency-phase MIMO hybrid digital array radar detection system according to claim 1, characterized in that: When the working mode is the phased array radar mode: the radar transmits twelve completely identical sub-array signals, the waveform generator generates a transmitting intermediate frequency signal, which is amplified and filtered by the integrated channel module, and then the frequency is multiplied to obtain a radio frequency transmitting signal, which is radiated into space through the frequency-phase MIMO integrated transmitting antenna array; During reception, the signals received by the twelve sub-array receiving antennas are mixed with the transmit coupled signals and down-converted into intermediate frequency signals, which are then amplified and enter the high-speed signal processor; the high-speed signal processor performs AD sampling and data storage, and after range pulse compression + MTD digital signal processing and CFAR processing, completes target detection, extracts range and speed information, obtains target azimuth information, and tracks the target through the tracking loop.

7. The frequency-phase MIMO hybrid digital array radar detection system according to claim 1, characterized in that: When the working mode is the frequency-controlled array radar mode: the radar transmits twelve sub-array signals with different carrier frequencies, the waveform generator of the high-speed signal processor generates a transmitting intermediate frequency signal, the intermediate frequency signal is mixed, amplified and filtered by the local oscillator of the intermediate frequency module, and then the frequency is multiplied to obtain the radio frequency transmission signal, which is radiated into space through the frequency-phase MIMO integrated transmitting antenna array.

8. The frequency-phase MIMO hybrid digital array radar detection system according to claim 1, characterized in that: When the working mode is the MIMO radar mode, the radar transmits twelve orthogonally coded sub-array signals, and the waveform generator of the high-speed signal processor transmits an intermediate frequency signal. The intermediate frequency signal is orthogonally encoded, and is amplified, filtered, and multiplied by the local oscillator mixing, amplification, and frequency multiplication of the intermediate frequency module to generate a radio frequency transmission signal, which is radiated into space through the frequency-phase MIMO integrated transmitting antenna array.

9. The frequency-phase MIMO hybrid digital array radar detection system according to claim 7, characterized in that: When the working mode is the frequency-controlled array radar mode, a transmitting beam brought by different carrier frequencies is used between transmitting array elements, and the transmitting beam has the characteristics of spatial agility, time agility, frequency agility, and waveform agility; The spatial agility means that the transmit beam has a joint range-azimuth dependency; The frequency agility means that each array element can use a different central carrier frequency; The time agility refers to the time-varying electromagnetic propagation interference effect caused by the simultaneous transmission of different carrier frequency waveforms; The waveform agility refers to that each transmitting array element can transmit different orthogonal or non-orthogonal waveforms.

10. The frequency-phase MIMO hybrid digital array radar detection system according to claim 1, characterized in that: The frequency-phase MIMO integrated antenna module is implemented by a surface-mount multi-channel array antenna method based on an antenna on a package; the surface-mount multi-channel array antenna method includes two dimensions: chip process and chip packaging; In terms of chip technology, phased array multi-channel T / R chips are used to achieve high integration and chip-based transceiver components. In terms of chip packaging, the chip, package and antenna in the phased array antenna are interconnected to form an antenna sub-array on the package.

Images