Single-photon laser active-passive imaging detection radar

Abstract

The application discloses a kind of single-photon laser active-passive imaging detection radars, comprising: laser emission module, laser ranging receiving module, focal plane imaging detection receiving module, timing control and ranging signal processing module, active-passive imaging data separation module, data processing module;Laser ranging acceptance module accepts the laser echo signal of target reflection, and target distance calculation is completed by the timing control and signal processing module;The focal plane imaging detection receiving module is based on the periodic pulse string gate signal that the timing control and signal processing module emit, in the mth measurement period, active reception and processing of echo signal are completed, and passive reception and processing of n-1 measurement periods are completed;The active-passive imaging data separation module realizes the separation of active imaging detection data and passive imaging detection data;And by data processing module, according to preset data processing algorithm processing, corresponding target active imaging and target passive imaging are obtained.

Description

Technical Field

[0001] This invention belongs to the field of radar imaging technology, and in particular relates to a single-photon laser active and passive imaging detection radar. Background Technology

[0002] With the continuous development of basic software and hardware technologies, single-photon laser non-scanning active and passive imaging detection technology based on Geiger focal plane cameras has attracted more and more attention and has produced a number of research results. This has greatly improved lidar in terms of operating range, imaging effect, and imaging speed, and has high application value.

[0003] Single-photon lidar imaging and detection systems typically operate in active imaging mode. They detect targets by locally emitting pulsed laser light towards them, which is then reflected back by a laser receiving system. However, research has shown that in some cases, the system can operate in passive mode, receiving the background light reflected from the target, thus achieving passive imaging and detection. Passive operation increases the system's stealth and flexibility, enriching its functionality.

[0004] Currently, there are few systems available for single-photon passive imaging detection, and there are almost no solutions that combine active and passive detection. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems of the prior art and disclose a single-photon laser active and passive imaging detection radar. This invention organically combines ranging, single-photon imaging detection, and single-photon passive imaging detection to achieve ranging-guided laser active imaging while also taking into account single-photon passive imaging, thereby improving the system's imaging detection efficiency and quality.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A single-photon laser active-passive imaging detection radar, comprising: a laser emitting module, a laser ranging and receiving module, a focal plane imaging detection and receiving module, a timing control and ranging signal processing module, an active-passive imaging data separation module, and a data processing module.

[0008] The laser emitting module emits periodic pulsed lasers toward the target based on the control signals from the timing control and signal processing module.

[0009] The laser ranging receiving module receives the laser echo signal reflected by the target based on the enable signal of the timing control and signal processing module, and simultaneously feeds back the target distance data containing the target distance information to the timing control and signal processing module while receiving the laser echo signal. The timing control and signal processing module then completes the target distance calculation.

[0010] The focal plane imaging detection and receiving module is based on n periodic pulse train gating signals issued by the timing control and signal processing module, so that the focal plane imaging detection and receiving module is in the effective working time of the m-th measurement cycle when the target echo signal arrives, where m < n. It completes the active reception and processing of the echo signal in the m-th measurement cycle and the passive reception and processing in the n-1 measurement cycles. The processed focal plane imaging detection data is then output to the active and passive imaging data separation module.

[0011] The active and passive imaging data separation module extracts the m-th frame of focal plane imaging detection data from the n frames of received focal plane imaging detection data as active imaging detection data, and extracts the remaining n-1 frames of focal plane imaging detection data as passive imaging detection data.

[0012] The data processing module processes the active imaging detection data and the passive imaging detection data according to a preset data processing algorithm to obtain the corresponding active target imaging and passive target imaging.

[0013] According to a preferred embodiment, the laser emitting module generates an optical synchronization signal while emitting laser pulses, which is input to the timing control and signal processing module as the starting point for laser ranging timing.

[0014] Alternatively, the laser emitting module emits laser pulses at a fixed frequency and outputs an optical synchronization signal to the timing control and signal processing module.

[0015] According to a preferred embodiment, after receiving the light output synchronization signal and delaying for a preset time, the timing control and signal processing module outputs an enable signal to the laser ranging and receiving module to control the laser ranging and receiving module to start working and receive the laser echo signal reflected by the target.

[0016] According to a preferred embodiment, the timing control and signal processing module obtains the pulse flight time dt of the laser pulse signal reflected by the target based on the starting point information of the laser ranging time and the target distance data fed back by the laser ranging receiving module, and then calculates the target distance using L = 0.5 * c * dt, where c is the speed of light and L is the target distance.

[0017] According to a preferred embodiment, after receiving the light output synchronization signal from the laser emitting module, the timing control and signal processing module delays for a preset time and then outputs n periodic pulse train gating signals to the focal plane imaging detection and receiving module, thereby controlling the focal plane imaging detection and receiving module to be in the effective working time of the m-th measurement cycle at the time of arrival of the target echo signal; wherein, the delay time is called the phase P of the gating signal, and the phase P is determined based on the measured target distance L.

[0018] According to a preferred embodiment, the phase P is calculated as follows:

[0019]

[0020] In the formula: Δt represents the floor function, L represents the target distance, c represents the speed of light in a vacuum, T represents the gating signal period, and Δt is the time constant.

[0021] According to a preferred embodiment, m is calculated as follows:

[0022]

[0023] In the formula: This indicates the floor function.

[0024] According to a preferred embodiment, the laser emitting module, the laser ranging and receiving module, and the focal plane imaging detection and receiving module are arranged coaxially.

[0025] According to a preferred embodiment, the laser ranging receiver module and the focal plane imaging detector receiver module are configured with a common aperture or with separate apertures.

[0026] The aforementioned main solution of the present invention and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted and are claimed by the present invention. Those skilled in the art, after understanding the solution of the present invention, will realize that there are many combinations based on existing technology and common knowledge, all of which are technical solutions to be protected by the present invention, and will not be exhaustively listed here.

[0027] The beneficial effects of this invention are as follows: The structural design of this single-photon laser active and passive imaging radar integrates laser ranging and laser imaging, overcoming the shortcomings of long detector dead time and short effective working time in single-photon laser ranging systems. It eliminates the need for prior information on target distance, avoiding complex range gating and push-broom processes, and improving imaging detection efficiency, especially for high-speed moving targets. By fusing single-photon active and passive imaging detection, the system becomes more powerful and versatile, with better performance. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the system architecture of the single-photon laser active and passive imaging detection radar of the present invention;

[0029] Figure 2 This is a schematic diagram of the signal timing relationship of the single-photon laser active and passive imaging detection radar of the present invention. Detailed Implementation

[0030] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0031] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, it should be pointed out that unless otherwise specified, the structures, connections, positional relationships, power source relationships, etc., involved in this invention are all things that those skilled in the art can discover without creative effort based on existing technology.

[0032] Example 1:

[0033] refer to Figure 1 As shown in the figure, a single-photon laser active-passive imaging detection radar is illustrated. The radar includes: a laser emitting module, a laser ranging and receiving module, a focal plane imaging detection and receiving module, a timing control and ranging signal processing module, an active-passive imaging data separation module, and a data processing module. The focal plane imaging detection and receiving module is a Geiger focal plane camera.

[0034] Preferably, the laser emitting module, laser ranging and receiving module, and focal plane imaging and receiving module are coaxially arranged. The laser ranging and receiving module and the focal plane imaging and receiving module can be configured with a common aperture or separate apertures. Furthermore, the laser ranging and receiving module and the focal plane imaging and receiving module share a single laser emitting module, achieving one-to-many transmission and reception.

[0035] Preferably, the laser emitting module emits periodic pulsed lasers toward the target based on the control signals from the timing control and signal processing module.

[0036] Furthermore, while the laser emitting module emits laser pulses, it generates an optical synchronization signal, which is input to the timing control and signal processing module as the starting point for laser ranging timing.

[0037] Alternatively, the laser emitting module emits laser pulses at a fixed frequency and outputs a light output synchronization signal to the timing control and signal processing module. That is, the laser emitting module does not receive the light output control signal from the timing control and signal processing module, but operates at a fixed frequency through the laser itself.

[0038] Preferably, the laser ranging receiving module receives the laser echo signal reflected by the target based on the enable signal of the timing control and signal processing module, and simultaneously feeds back target distance data containing target distance information to the timing control and signal processing module while receiving the laser echo signal, so that the timing control and signal processing module can complete the target distance calculation.

[0039] Specifically, after receiving the light output synchronization signal and delaying for a preset time, the timing control and signal processing module outputs an enable signal to the laser ranging and receiving module, controlling the laser ranging and receiving module to start working and receive the laser echo signal reflected by the target.

[0040] The timing control and signal processing module, based on the starting point information of the laser ranging timer and the target distance data fed back by the laser ranging receiver module, obtains the pulse flight time dt of the laser pulse signal reflected by the target, and then calculates the target distance using L = 0.5 * c * dt, where c is the speed of light and L is the target distance. The timing relationship is as follows: Figure 2 As shown.

[0041] Preferably, the focal plane imaging detection and receiving module is based on n periodic pulse train gating signals issued by the timing control and signal processing module, so that the focal plane imaging detection and receiving module is in the effective working time of the m-th measurement cycle when the target echo signal arrives, where m < n. The active reception and processing of the echo signal is completed in the m-th measurement cycle, and the passive reception and processing is completed in the n-1 measurement cycles. The processed focal plane imaging detection data are then output to the active and passive imaging data separation module.

[0042] Specifically, after receiving the light output synchronization signal from the laser emission module, the timing control and signal processing module delays for a preset time and then outputs n periodic pulse train gating signals to the focal plane imaging detection and receiving module, thereby controlling the focal plane imaging detection and receiving module to be in the effective working time of the m-th measurement cycle when the target echo signal arrives.

[0043] The delay time is called the phase P of the gating signal, which is determined based on the measured target distance L. Measuring the target distance L is a continuous, multiple-measurement process; the L used here is the result of a previous measurement. Alternatively, the target distance can be obtained through other methods (such as microwave radar, triangulation, etc.).

[0044] The phase P is calculated as follows:

[0045]

[0046] In the formula: The expression represents floor function, L represents the target distance, c represents the speed of light in a vacuum, T represents the gating signal period, and Δt is the time constant. Here, the focal plane detector operates with a period of T. Within this time interval, the detector only has a very short period (effective working time) to receive signals normally; the rest is dead time. The purpose of phase control here is to ensure that the detector is in an effective working state at the moment the laser pulse signal reflected from the target arrives.

[0047] After receiving n periodic gating signals, the focal plane detector receiving module operates n times and outputs n frames of focal plane detection data. The timing relationship is as follows: Figure 2 As shown.

[0048] The active and passive imaging data separation module extracts the m-th frame of focal plane imaging detection data from the n frames of received focal plane imaging detection data as active imaging detection data, and extracts the remaining n-1 frames of focal plane imaging detection data as passive imaging detection data.

[0049] The method for calculating m is as follows:

[0050]

[0051] In the formula: This indicates the floor function.

[0052] The data processing module processes the active imaging detection data and the passive imaging detection data according to the preset data processing algorithm to obtain the corresponding active target imaging and passive target imaging.

[0053] The structural design of this invention, using a single-photon laser active and passive imaging radar, achieves an integrated design of laser ranging and laser imaging, overcoming the shortcomings of long detector dead time and short effective working time in single-photon laser ranging systems. It eliminates the need for prior information on target distance, avoiding complex range gating and push-broom processes, and improving imaging detection efficiency, especially for high-speed moving targets. By fusing single-photon active and passive imaging detection, the system becomes more powerful and versatile, with better performance.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A single-photon laser active / passive imaging detection radar, characterized in that, The single-photon laser active and passive imaging detection radar includes: a laser emitting module, a laser ranging and receiving module, a focal plane imaging detection and receiving module, a timing control and ranging signal processing module, an active and passive imaging data separation module, and a data processing module. The laser emitting module emits periodic pulsed lasers toward the target based on the control signals from the timing control and signal processing module. The laser ranging receiving module receives the laser echo signal reflected by the target based on the enable signal of the timing control and signal processing module, and simultaneously feeds back the target distance data containing the target distance information to the timing control and signal processing module while receiving the laser echo signal. The timing control and signal processing module then completes the target distance calculation. The focal plane imaging detection and receiving module is based on n periodic pulse train gating signals issued by the timing control and signal processing module, so that the focal plane imaging detection and receiving module is in the effective working time of the m-th measurement cycle when the target echo signal arrives, where m < n. It completes the active reception and processing of the echo signal in the m-th measurement cycle and the passive reception and processing in the n-1 measurement cycles. The processed focal plane imaging detection data is then output to the active and passive imaging data separation module. The active and passive imaging data separation module extracts the m-th frame of focal plane imaging detection data from the n frames of received focal plane imaging detection data as active imaging detection data, and extracts the remaining n-1 frames of focal plane imaging detection data as passive imaging detection data. The data processing module processes the active imaging detection data and the passive imaging detection data according to a preset data processing algorithm to obtain the corresponding active target imaging and passive target imaging. After receiving the output synchronization signal from the laser emitting module, the timing control and signal processing module delays for a preset time and then outputs n periodic pulse train gating signals to the focal plane imaging detection and receiving module. This controls the focal plane imaging detection and receiving module to be in the effective working time of the m-th measurement cycle when the target echo signal arrives. The delay time is called the phase P of the gating signal, and the phase P is determined based on the measured target distance L. The phase P is calculated as follows: In the formula: Δt represents the floor function, L represents the target distance, c represents the speed of light in a vacuum, T represents the period of the gate signal, and Δt is the time constant. The method for calculating m is as follows: In the formula: This indicates the floor function.

2. The single-photon laser active / passive imaging detection radar as described in claim 1, characterized in that, While emitting laser pulses, the laser emitting module generates an optical synchronization signal, which is input to the timing control and signal processing module as the starting point for laser ranging timing.

3. The single-photon laser active / passive imaging detection radar as described in claim 1, characterized in that, Alternatively, the laser emitting module emits laser pulses at a fixed frequency and outputs an optical synchronization signal to the timing control and signal processing module.

4. The single-photon laser active / passive imaging detection radar as described in claim 2 or 3, characterized in that, After receiving the light output synchronization signal and delaying for a preset time, the timing control and signal processing module outputs an enable signal to the laser ranging and receiving module, controlling the laser ranging and receiving module to start working and receive the laser echo signal reflected by the target.

5. The single-photon laser active / passive imaging detection radar as described in claim 4, characterized in that, The timing control and signal processing module obtains the pulse flight time dt of the laser pulse signal reflected by the target based on the starting point information of the laser ranging time and the target distance data fed back by the laser ranging receiving module. Then, it calculates the target distance using L = 0.5 * c * dt, where c is the speed of light and L is the target distance.

6. The single-photon laser active / passive imaging detection radar as described in claim 1, characterized in that, The laser emitting module, laser ranging and receiving module, and focal plane imaging detection and receiving module are coaxially arranged.

7. The single-photon laser active / passive imaging detection radar as described in claim 1, characterized in that, The laser ranging receiver module and the focal plane imaging detector receiver module are configured with either a common aperture or separate apertures.

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