A radar search imaging waveform configuration method and device

Abstract

The application discloses a radar search imaging waveform configuration method and device, comprising: determining index requirements of search and imaging and radar parameters; determining pulse parameters of each pulse based on the index requirements and the radar parameters, wherein one cycle has multiple pulses, and the multiple pulses include imaging pulses for imaging purposes and search pulses for search purposes; determining time intervals between the pulses according to time required by device switching states; and realizing search and imaging simultaneously based on the parameters after configuration is completed. The method of the application determines pulse parameters of each pulse based on index requirements and radar parameters, thereby accurately configuring time widths and bandwidths of imaging pulses and search pulses, and simultaneously completing search and imaging of a reconnaissance surveillance radar in one pulse repetition cycle. The method guarantees completion of the imaging function, avoids appearance of a surveillance blind area, improves radar detection performance, and increases airspace surveillance capability of the radar.

Description

Technical Field

[0001] This application relates to the field of radar technology, and in particular to a radar search imaging waveform configuration method and apparatus. Background Technology

[0002] Modern reconnaissance and surveillance radars deal with a wide range of targets, including low-altitude, land, and sea targets. Typical targets include fixed-wing aircraft, helicopters, drones, vehicles, personnel, and ships. With the development of modern advanced weapon systems and radar electronics technology, the demands on reconnaissance and surveillance radars have expanded beyond simply detecting and locating targets. Target identification has become an increasingly important requirement. Radars should be able to provide advance warnings and alerts for targets with a higher threat level while detecting them. Because different types of reconnaissance and surveillance targets have different scattering characteristics, analyzing the geometric features and structural characteristics of targets is essential for automatically classifying and identifying various types of targets. This requires reconnaissance and surveillance radars to possess high-resolution range imaging capabilities.

[0003] Existing mechanically scanned reconnaissance and surveillance radars employ elevation shaping and fixed azimuth beams, achieving 360° azimuth coverage through mechanical rotation. They require time-based segmentation to search for and image targets. For example... Figure 1 As shown, when a radar transmits an imaging waveform in the direction of the imaging target, it loses its ability to detect the target; searching and imaging cannot be performed simultaneously. This means that traditional reconnaissance and surveillance radars cannot perform searches in imaging mode, resulting in blind spots and the loss of intelligence information from the imaging sector. Summary of the Invention

[0004] This application provides a radar search and imaging waveform configuration method and apparatus to precisely configure the duration and bandwidth of the imaging pulse and search pulse, enabling the search and imaging of the reconnaissance and surveillance radar to be completed simultaneously within one pulse repetition cycle. This ensures the imaging function is completed while avoiding surveillance blind spots, improving radar detection performance and increasing the radar's airspace surveillance capabilities.

[0005] This application provides a radar search imaging waveform configuration method, including the following steps:

[0006] Determine the requirements for search and imaging, as well as the radar parameters;

[0007] Based on the aforementioned index requirements and radar parameters, the pulse parameters of each pulse are determined. One period has multiple pulses, including imaging pulses for imaging purposes and search pulses for search purposes. The pulse parameters of each pulse can be different.

[0008] The time interval between each pulse is determined based on the time required for the device to switch states.

[0009] Based on the configured parameters, the system can perform simultaneous searching and imaging.

[0010] Optionally, the determined search and imaging metrics may include: maximum search distance R. max Search minimum distance R min Maximum imaging distance R′ max Minimum imaging distance R′ min Distance resolution ΔR, imaging resolution ΔR′;

[0011] The determined radar parameters include: transmit power P, antenna transmit gain G. t Antenna receiving gain G r Target radar cross section σ, equivalent radar cross section σ′ under imaging conditions, radar transmission wavelength λ, pulse accumulation number N, minimum detectable signal-to-noise ratio (S / N) min Boltzmann constant K, reference temperature T0, receiver noise figure F n .

[0012] Optionally, based on the aforementioned performance requirements and the radar parameters, the pulse parameters for each pulse are determined as follows:

[0013] The search bandwidth B is determined based on the distance resolution ΔR requirement in the specifications, to meet the following conditions.

[0014] The search bandwidth B′ is determined based on the imaging resolution ΔR′ requirement in the specification, satisfying the following:

[0015] The pulse width of the first search pulse is determined based on the radar power requirements specified in the indicator requirements, satisfying the following:

[0016]

[0017] The pulse width of the first imaging pulse is determined based on the requirements for radar imaging power in the technical specifications, satisfying the following:

[0018] Based on the minimum radar imaging distance requirement and blind spot compensation requirement in the specifications, the pulse width of the second imaging pulse is determined to meet the following:

[0019] Based on the detection range and the duration of the transmitted pulse, the radar repetition period T is determined, where T > τ1′ + τ1 + Δt + 2R. max / c;

[0020] Based on the frequency band requirements in the technical specifications, the anti-interference strategy requirements, and the search bandwidth B and imaging bandwidth B′, the center frequency of each pulse is determined.

[0021] Optionally, determining the pulse parameters of each pulse based on the aforementioned performance requirements and radar parameters further includes:

[0022] When the second search pulse is used to fill in the distance blind spot by supplementing the first search pulse and the second imaging pulse, the pulse width of the second search pulse satisfies:

[0023] Optionally, determining the pulse parameters of each pulse based on the aforementioned performance requirements and radar parameters further includes:

[0024] When the third search pulse is used to compensate for the distance blindness of the second search pulse, the width of the third search pulse satisfies:

[0025] Optionally, the time interval between each pulse can be determined as a specified multiple of the time required for the device to switch states, based on the time required for the device to switch states.

[0026] This application also proposes a computer device, including a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, it implements the steps of the radar search imaging waveform configuration method described above.

[0027] This application also proposes a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the radar search imaging waveform configuration method described above.

[0028] Based on the performance requirements and radar parameters, this application's embodiments determine the pulse parameters of each pulse, thereby precisely configuring the duration and bandwidth of the imaging and search pulses. This allows the reconnaissance and surveillance radar to simultaneously complete its search and imaging within a single pulse repetition cycle. This ensures the imaging function is completed while avoiding blind spots, improving radar detection performance, and enhancing the radar's airspace surveillance capabilities.

[0029] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0031] Figure 1 This is an example of the imaging operation mode of a mechanical scanning reconnaissance and surveillance radar;

[0032] Figure 2 This is an example of the simultaneous search and imaging operation mode of the mechanical scanning reconnaissance and surveillance radar in this application embodiment;

[0033] Figure 3 This is a basic flowchart example of the radar search imaging waveform configuration method according to an embodiment of this application;

[0034] Figure 4 This is an example of a waveform configuration method for simultaneous searching and imaging in an embodiment of this application. Detailed Implementation

[0035] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0036] This application provides a radar search imaging waveform configuration method, such as... Figure 2 , Figure 3 As shown, it includes the following steps:

[0037] In step S301, the search and imaging performance requirements and radar parameters are determined. In some embodiments, the determined search and imaging performance requirements include: maximum search range R. max Search minimum distance R min Maximum imaging distance R′ max Minimum imaging distance R′ min Distance resolution ΔR, imaging resolution ΔR′.

[0038] The determined radar parameters include: transmit power P, antenna transmit gain G. t Antenna receiving gain G r Target radar cross section σ, equivalent radar cross section σ′ under imaging conditions, radar transmission wavelength λ, pulse accumulation number N, minimum detectable signal-to-noise ratio (S / N) min Boltzmann constant K, reference temperature T0, receiver noise figure F n .

[0039] In step S302, based on the specified requirements and the radar parameters, the pulse parameters of each pulse are determined. One period has multiple pulses, including imaging pulses for imaging purposes and search pulses for search purposes. The pulse parameters of each pulse can be different. For example... Figure 4 As shown in the illustration, this application takes the example of a radar solid-state power amplifier continuously transmitting 5 pulses within one pulse repetition cycle to achieve target imaging, detection, and range blind spot compensation. The 5 continuously transmitted pulses, from left to right, are the first imaging pulse, the first search pulse, the second imaging pulse, the second search pulse, and the third search pulse, with an interval of Δt between adjacent pulses. Wherein:

[0040] The first imaging pulse uses a linear frequency modulated signal with a center frequency of f1′, a modulation bandwidth of B′, and a pulse width of τ′1.

[0041] The first search pulse uses a linear frequency modulated signal with a center frequency of f1, a modulation bandwidth of B, and a pulse width of τ1.

[0042] The second imaging pulse uses a linear frequency modulated signal with a center frequency of f2′, a modulation bandwidth of B′, and a pulse width of τ′2.

[0043] The second search pulse uses a linear frequency modulated signal with a center frequency of f2, a modulation bandwidth of B, and a pulse width of τ2.

[0044] The third search pulse uses a linear frequency modulated signal with a center frequency of f3, a modulation bandwidth of B, and a pulse width of τ3.

[0045] The imaging pulse parameter settings meet the imaging performance requirements; the search pulse parameter settings meet the search performance requirements.

[0046] In step S303, the time interval between each pulse is determined based on the time required for the device to switch states. For example... Figure 4 The transmission timing sequence is as follows: the first imaging pulse, the first search pulse, the second imaging pulse, the second search pulse, and the third search pulse are transmitted sequentially, with an interval set to Δt.

[0047] In step S304, based on the parameters after configuration, simultaneous searching and imaging is achieved.

[0048] In this embodiment, the radar has five pulses in the same pulse repetition period corresponding to five transmission frequencies f1′, f2′, f1, f2, and f3. The working state of these five transmission frequencies can be controlled independently. The center frequency, frequency modulation slope, and polarity of the operation can be controlled by the control code. An induced frequency can also be generated before the working pulse to resist aiming interference.

[0049] In this embodiment, each pulse can be a linear frequency modulated signal, or it can be a nonlinear frequency modulated signal or a phase modulated signal. The number of pulses in this embodiment is not limited to five; it can be increased or decreased according to performance and cost requirements.

[0050] For example, when the radar power-aperture product is large enough or the minimum search range requirement is lenient, the third search pulse may not be required. When the radar system has a lenient minimum imaging range requirement, the second imaging pulse may not be required. When the radar power-aperture product is small but close-range target detection is still required, the third search pulse cannot simultaneously compensate for the blind spot caused by the second search pulse and detect close-range targets; therefore, an additional search pulse needs to be added after the third search pulse. When the radar power-aperture product is small but close-range target imaging is still required, the second imaging pulse cannot simultaneously compensate for the blind spot caused by the first imaging pulse and detect close-range targets; therefore, an additional imaging pulse needs to be added, which can be placed between the second and third search pulses. In this case, the third search pulse needs to have a longer duration to meet the blind spot compensation requirement of the newly added pulse. The specific pulse number configurations will not be elaborated upon here.

[0051] This application embodiment determines the pulse parameters of each pulse based on performance requirements and radar parameters, thereby precisely configuring the duration and bandwidth of the imaging and search pulses. This allows the search and imaging of the reconnaissance and surveillance radar to be completed simultaneously within a single pulse repetition cycle. This ensures the imaging function is completed while avoiding blind spots, improving radar detection performance and increasing the radar's airspace surveillance capabilities.

[0052] In some embodiments, determining the pulse parameters of each pulse based on the performance requirements and the radar parameters includes:

[0053] The search bandwidth B is determined based on the distance resolution ΔR requirement in the specifications, to meet the following conditions.

[0054] The search bandwidth B′ is determined based on the imaging resolution ΔR′ requirement in the specification, satisfying the following:

[0055] The pulse width of the first search pulse is determined based on the radar power requirements specified in the indicator requirements, satisfying the following:

[0056]

[0057] The pulse width of the first imaging pulse is determined based on the requirements for radar imaging power in the technical specifications, satisfying the following:

[0058] Based on the minimum radar imaging distance requirement and blind spot compensation requirement in the specifications, the pulse width of the second imaging pulse is determined to meet the following:

[0059] Based on the detection range and the duration of the transmitted pulse, the radar repetition period T is determined, where T > τ1′ + τ1 + Δt + 2R. max / c.

[0060] Based on the frequency band requirements in the technical specifications, the anti-interference strategy requirements, and the search bandwidth B and imaging bandwidth B′, the center frequencies f1′, f2′, f1, f2, and f3 of each pulse are determined.

[0061] In some embodiments, determining the pulse parameters of each pulse based on the indicator requirements and the radar parameters further includes:

[0062] When the second search pulse is used to fill in the distance blind spot by supplementing the first search pulse and the second imaging pulse, the pulse width of the second search pulse satisfies:

[0063] In some embodiments, determining the pulse parameters of each pulse based on the indicator requirements and the radar parameters further includes:

[0064] When the third search pulse is used to compensate for the distance blindness of the second search pulse, the width of the third search pulse satisfies:

[0065] In some embodiments, the time interval between each pulse is determined to be a specified multiple of the time required for the device to switch states, based on the time required for the device to switch states. For example, it can be set to pulse interval Δt > 1.5t0, where t0 is the time required for the device to switch states.

[0066] The method in this application embodiment utilizes a simultaneous search and imaging waveform setting method, which has the following advantages compared to traditional single waveform setting methods:

[0067] Search and imaging are completed simultaneously, requiring no additional time or resource overhead. Quantitative calculations of waveform settings ensure full-range imaging and search capabilities. Pulse parameters can be configured via software to flexibly match detection and imaging requirements. Each frequency channel can operate in different states (inter-pulse agility, pulse group agility, coded agility, fixed frequency, induced frequency, etc.), improving anti-interference capabilities. The minimum frequency interval can be controlled via software, better suppressing image frequency interference. Independent operating frequencies are used, employing only one intermediate frequency signal; all channel circuits are identical, simplifying the design. Search and imaging coverage can be adjusted by adding or removing pulses, achieving channel redundancy.

[0068] This application also proposes a computer device, including a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, it implements the steps of the radar search imaging waveform configuration method described above.

[0069] This application also proposes a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the radar search imaging waveform configuration method described above.

[0070] This application embodiment determines the pulse parameters of each pulse based on performance requirements and radar parameters, thereby precisely configuring the duration and bandwidth of the imaging and search pulses. This allows the search and imaging of the reconnaissance and surveillance radar to be completed simultaneously within a single pulse repetition cycle. This ensures the imaging function is completed while avoiding blind spots, improving radar detection performance and increasing the radar's airspace surveillance capabilities.

[0071] It should be noted that, in the embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0072] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0073] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0074] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims. All of these forms are within the protection scope of this application.

Claims

1. A radar search imaging waveform configuration method, characterized in that, Includes the following steps: The search and imaging performance requirements and radar parameters are determined. These requirements include: maximum search range. Search minimum distance Maximum imaging distance Minimum imaging distance Distance resolution Imaging resolution ; The determined radar parameters include: transmit power. Antenna transmit gain Antenna receiving gain Target radar cross-section Equivalent radar cross section of target under imaging conditions Radar transmission wavelength Pulse accumulation number Minimum detectable signal-to-noise ratio Boltzmann constant reference temperature Receiver noise figure ; Based on the aforementioned index requirements and radar parameters, the pulse parameters of each pulse are determined. One period has multiple pulses, including imaging pulses for imaging purposes and search pulses for search purposes. The pulse parameters of each pulse can be different. The time interval between each pulse is determined based on the time required for the device to switch states. Based on the configured parameters, the system can perform simultaneous searching and imaging. Based on the aforementioned performance requirements and radar parameters, the pulse parameters for each pulse are determined as follows: According to the distance resolution requirements The requirement is to determine the search bandwidth B, which satisfies... ; According to the imaging resolution requirements Requirements for determining search bandwidth ,satisfy: ; The pulse width of the first search pulse is determined based on the radar power requirements specified in the specifications, satisfying the following: ; The pulse width of the first imaging pulse is determined based on the requirements for radar imaging power in the technical specifications, satisfying the following: ; Based on the minimum radar imaging distance requirement and blind spot compensation requirement in the specifications, the pulse width of the second imaging pulse is determined to meet the following: ; The radar repetition period T is determined based on the detection range and the duration of the transmitted pulse. ; Based on the frequency band requirements in the technical specifications, the anti-interference strategy requirements, and the search bandwidth... Imaging bandwidth Determine the center frequency of each pulse; Also includes: When the second search pulse is used to fill in the distance blind spot by supplementing the first search pulse and the second imaging pulse, the pulse width of the second search pulse satisfies: .

2. The radar search imaging waveform configuration method as described in claim 1, characterized in that, Based on the aforementioned performance requirements and radar parameters, determining the pulse parameters for each pulse further includes: When the third search pulse is used to compensate for the distance blindness of the second search pulse, the width of the third search pulse satisfies: .

3. The radar search imaging waveform configuration method as described in claim 1, characterized in that, Based on the time required for the device to switch states, the time interval between each pulse is determined to be a specified multiple of the time required for the device to switch states.

4. A computer device, characterized in that, It includes a processor and a memory, wherein the memory stores a computer program that, when executed by the processor, implements the steps of the radar search imaging waveform configuration method as described in any one of claims 1 to 3.

5. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the radar search imaging waveform configuration method as described in any one of claims 1 to 3.

Images