阅读说明：本技术 一种基于连续压缩态激光的目标回波探测系统及方法 (Target echo detection system and method based on continuous compression state laser ) 是由 孙腾 赵康 陈红 彭月 王静 苏必达 王景峰 于 2020-12-29 设计创作，主要内容包括：本发明提供了一种基于连续压缩态激光的目标回波探测系统及方法。本发明中,姿态模拟系统位于周向轨道中心,量子回波高阶关联探测系统的平衡零拍探测装置位于周向轨道上；连续压缩态光源输出本地光和探测光,利用相位调制器调节本地光的相位,控制姿态模拟系统,使探测光以不同的俯仰角和方位角照射在待测目标上；调节平衡零拍探测装置的位置,使平衡零拍探测装置以不同角度接收回波信号,经过相位调制的本地光和回波信号在平衡零拍探测装置上发生耦合,然后分别被量子回波高阶关联探测系统的两个探测器接收,信号处理系统对探测器输出的信号进行处理,得到回波信号中的量子特性信息。(The invention provides a target echo detection system and method based on continuous compression state laser. In the invention, an attitude simulation system is positioned in the center of a circumferential track, and a balanced homodyne detection device of a quantum echo high-order correlation detection system is positioned on the circumferential track; the continuous compression state light source outputs local light and detection light, the phase modulator is used for adjusting the phase of the local light and controlling the attitude simulation system, so that the detection light irradiates on a target to be detected at different pitch angles and azimuth angles; adjusting the position of the balanced homodyne detection device to enable the balanced homodyne detection device to receive echo signals at different angles, coupling the phase-modulated local light and the echo signals on the balanced homodyne detection device, receiving the coupled local light and the echo signals by two detectors of a quantum echo high-order correlation detection system respectively, and processing signals output by the detectors by a signal processing system to obtain quantum characteristic information in the echo signals.)

1. A target echo detection system based on continuous compression state laser is characterized by comprising a continuous compression state light source, an attitude simulation system, a circumferential track, a quantum echo high-order correlation detection system and a signal processing system;

the target to be measured is placed on the attitude simulation system, and the attitude simulation system can drive the target to be measured to rotate to any upper rotation angle, lower rotation angle, arc angle and circumferential angle;

the attitude simulation system is positioned in the center of the circumferential track;

the optical signal receiving part of the quantum echo higher-order correlation detection system is positioned on the circumferential track and can move along the circumferential track;

the continuous compression state laser output by the continuous compression state light source is divided into two beams, and one beam is used as local light to enter the quantum echo high-order correlation detection system; the other beam is used as detection light, irradiates the target to be detected, and is reflected by the target to be detected to form an echo signal which enters the quantum echo high-order correlation detection system;

the signal processing system is used for analyzing the signal output by the quantum echo high-order correlation detection system to obtain quantum characteristic information in the echo signal of the target to be detected.

2. The continuous compression state laser-based target echo detection system according to claim 1, wherein the continuous compression state light source comprises a laser, a frequency doubling device and an optical parametric amplification device; and continuous laser output by the laser enters the frequency doubling device, laser emitted from the frequency doubling device enters the optical parametric amplification device as a pumping source, and the laser output from the optical parametric amplification device is compressed laser.

3. The continuous compression state laser-based target echo detection system according to claim 2, wherein the wavelengths of the continuous laser output by the laser and the laser output from the optical parametric amplification device are 1064 nm.

4. The continuous-compression-state-laser-based target echo detection system of claim 2, wherein the continuous-compression-state light source further comprises a feedback control system comprising a temperature control module and a cavity length control module:

the temperature control module is used for controlling the temperature of the nonlinear crystals in the frequency doubling device and the optical parametric amplification device;

and the cavity length control module is used for controlling the cavity lengths of the frequency doubling device and the optical parametric amplification device.

5. The continuous compression state laser based target echo detection system according to claim 1, wherein the quantum echo higher order correlation detection system comprises a phase modulator, a balanced homodyne detection device and two detectors;

the phase modulator is used for carrying out phase modulation on the local light;

the balanced homodyne detection device is used as an optical signal receiving part of the quantum echo high-order correlation detection system;

the echo signal and the local light after phase modulation are coupled at the balanced homodyne detection device and are respectively received by the two detectors after being transmitted by the balanced homodyne detection device.

6. The continuous compression state laser based target echo detection system according to claim 1, wherein the signal processing system comprises:

the first analysis module is configured to perform high-order correlation processing on phase and amplitude information of the detected echo signal to obtain phase and amplitude correlation characteristics of the echo signal and the local light; and

and the second analysis module is configured to analyze and process the phase and amplitude correlation characteristics of the echo signal and the local light to obtain quantum characteristic information in the echo signal of the target to be detected.

7. A target echo detection method based on continuous compression state laser is characterized by comprising the following steps:

placing a target to be detected on an attitude simulation system, placing the attitude simulation system at the center of a circumferential track, and placing a balanced homodyne detection device on the circumferential track;

dividing the continuous compression state laser output by the continuous compression state light source into two beams, wherein one beam is used as local light, the phase of the local light is adjusted by using a phase modulator, and the other beam is used as probe light;

controlling the attitude simulation system to enable the detection light to irradiate the target to be detected at different pitch angles and azimuth angles;

adjusting the position of the balanced homodyne detection device on the circumferential track to enable the balanced homodyne detection device to receive laser reflected by the target to be detected, namely echo signals, at different angles, and enabling local light after phase modulation to irradiate on the balanced homodyne detection device while the balanced homodyne detection device receives the echo signals;

utilizing two detectors to respectively detect local light and echo signals transmitted by the balanced homodyne detection device;

and analyzing the signals detected by the two detectors to obtain quantum characteristic information in the echo signal of the target to be detected.

8. The method according to claim 7, wherein the continuous compression state light source comprises a laser, a frequency doubling device and an optical parametric amplification device; and continuous laser output by the laser enters the frequency doubling device, laser emitted from the frequency doubling device enters the optical parametric amplification device as a pumping source, and the laser output from the optical parametric amplification device is compressed laser.

9. The continuous compression state laser-based target echo detection method according to claim 7, wherein the continuous compression state light source further comprises a feedback control system, the feedback control system comprises a temperature control module and a cavity length control module:

the temperature control module is used for controlling the temperature of the nonlinear crystals in the frequency doubling device and the optical parametric amplification device;

and the cavity length control module is used for controlling the cavity lengths of the frequency doubling device and the optical parametric amplification device.

10. The method according to claim 7, wherein analyzing the signals detected by the two detectors to obtain the quantum characteristic information in the echo signal of the target comprises:

performing high-order correlation processing on the phase and amplitude information of the detected echo signal to obtain the phase and amplitude correlation characteristics of the echo signal and the local light;

and analyzing and processing the phase and amplitude correlation characteristics of the echo signal and the local light to obtain quantum characteristic information in the echo signal of the target to be detected.

Technical Field

The invention relates to the field of radar target detection, in particular to a target echo detection technology based on continuous compression state laser.

Background

The existing laser echo detection technology has the defects of large transmitting power, poor anti-stealth capability, weak imaging capability caused by low signal-to-noise ratio of echo signals and the like, so that the high-efficiency and quick perception and fine structure description of small targets, stealth targets and even point targets are limited, and the development of the existing laser echo detection technology enters a bottleneck stage.

Therefore, a new laser echo detection technology is needed to meet the development requirement of radar target detection.

Disclosure of Invention

The invention aims to solve the technical problems of high transmitting power, poor anti-stealth capability and weak imaging capability of the existing laser echo detection technology.

The invention discloses a target echo detection system based on continuous compression state laser, which comprises a continuous compression state light source, an attitude simulation system, a circumferential track, a quantum echo high-order correlation detection system and a signal processing system, wherein the signal processing system is connected with the circumferential track;

the target to be measured is placed on the attitude simulation system, and the attitude simulation system can drive the target to be measured to rotate to any upper rotation angle, lower rotation angle, arc angle and circumferential angle;

the attitude simulation system is positioned in the center of the circumferential track;

the optical signal receiving part of the quantum echo higher-order correlation detection system is positioned on the circumferential track and can move along the circumferential track;

the continuous compression state laser output by the continuous compression state light source is divided into two beams, and one beam is used as local light to enter the quantum echo high-order correlation detection system; the other beam is used as detection light, irradiates the target to be detected, and is reflected by the target to be detected to form an echo signal which enters the quantum echo high-order correlation detection system;

the signal processing system is used for analyzing the signal output by the quantum echo high-order correlation detection system to obtain quantum characteristic information in the echo signal of the target to be detected.

Optionally, the continuous compression state light source includes a laser, a frequency doubling device and an optical parametric amplification device; and continuous laser output by the laser enters the frequency doubling device, laser emitted from the frequency doubling device enters the optical parametric amplification device as a pumping source, and the laser output from the optical parametric amplification device is compressed laser.

Optionally, the wavelength of the continuous laser output by the laser and the wavelength of the laser output by the optical parametric amplification device are both 1064 nm.

Optionally, the continuous compression state light source further comprises a feedback control system, and the feedback control system comprises a temperature control module and a cavity length control module:

the temperature control module is used for controlling the temperature of the nonlinear crystals in the frequency doubling device and the optical parametric amplification device;

and the cavity length control module is used for controlling the cavity lengths of the frequency doubling device and the optical parametric amplification device.

Optionally, the quantum echo higher-order correlation detection system includes a phase modulator, a balanced homodyne detection device, and two detectors;

the phase modulator is used for carrying out phase modulation on the local light;

the balanced homodyne detection device is used as an optical signal receiving part of the quantum echo high-order correlation detection system;

the echo signal and the local light after phase modulation are coupled at the balanced homodyne detection device and are respectively received by the two detectors after being transmitted by the balanced homodyne detection device.

Optionally, the signal processing system comprises:

the first analysis module is configured to perform high-order correlation processing on phase and amplitude information of the detected echo signal to obtain phase and amplitude correlation characteristics of the echo signal and the local light; and

and the second analysis module is configured to analyze and process the phase and amplitude correlation characteristics of the echo signal and the local light to obtain quantum characteristic information in the echo signal of the target to be detected.

The invention also discloses a target echo detection method based on the continuous compression state laser, which comprises the following steps:

placing a target to be detected on an attitude simulation system, placing the attitude simulation system at the center of a circumferential track, and placing a balanced homodyne detection device on the circumferential track;

dividing the continuous compression state laser output by the continuous compression state light source into two beams, wherein one beam is used as local light, the phase of the local light is adjusted by using a phase modulator, and the other beam is used as probe light;

controlling the attitude simulation system to enable the detection light to irradiate the target to be detected at different pitch angles and azimuth angles;

adjusting the position of the balanced homodyne detection device on the circumferential track to enable the balanced homodyne detection device to receive laser reflected by the target to be detected, namely echo signals, at different angles, and enabling local light after phase modulation to irradiate on the balanced homodyne detection device while the balanced homodyne detection device receives the echo signals;

utilizing two detectors to respectively detect local light and echo signals transmitted by the balanced homodyne detection device;

and analyzing the signals detected by the two detectors to obtain quantum characteristic information in the echo signal of the target to be detected.

Optionally, the continuous compression state light source includes a laser, a frequency doubling device and an optical parametric amplification device; and continuous laser output by the laser enters the frequency doubling device, laser emitted from the frequency doubling device enters the optical parametric amplification device as a pumping source, and the laser output from the optical parametric amplification device is compressed laser.

Optionally, the continuous compression state light source further comprises a feedback control system, and the feedback control system comprises a temperature control module and a cavity length control module:

the temperature control module is used for controlling the temperature of the nonlinear crystals in the frequency doubling device and the optical parametric amplification device;

and the cavity length control module is used for controlling the cavity lengths of the frequency doubling device and the optical parametric amplification device.

Optionally, the analyzing the signals detected by the two detectors to obtain the quantum characteristic information in the echo signal of the target to be detected includes:

performing high-order correlation processing on the phase and amplitude information of the detected echo signal to obtain the phase and amplitude correlation characteristics of the echo signal and the local light;

and analyzing and processing the phase and amplitude correlation characteristics of the echo signal and the local light to obtain quantum characteristic information in the echo signal of the target to be detected.

Compared with the prior art, the invention has the following advantages:

the low-power continuous compression state laser is used as the detection light, the anti-stealth capability is strong, the power consumption of a laser detection system can be effectively reduced, the detection method is applicable to various light platforms, the detection means of the target is enriched, the detection performance of the low visible target is improved, and the signal-to-noise ratio of an echo signal generated by the quantum compression light as the detection light is high, so that the imaging capability is strong.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a schematic diagram of a target echo detection system based on continuous compression state laser according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of a target echo detection method based on continuous compression state laser according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions.

Fig. 1 is a schematic diagram of a target echo detection system based on continuous compression state laser according to an embodiment of the present invention, and the target echo detection system based on continuous compression state laser according to an embodiment of the present invention may generally include a continuous compression state light source 1, an attitude simulation system 2, a circumferential track 3, a quantum echo high-order correlation detection system 4, and a signal processing system 5;

a target to be measured is placed on the attitude simulation system 2, the target of the embodiment is a target model, and the attitude simulation system 2 can drive the target to be measured to rotate to any upper rotation angle, lower rotation angle, arc angle and circumferential angle;

the attitude simulation system 2 is positioned at the center of the circumferential track 3;

the optical signal receiving part of the quantum echo higher order correlation detection system 4 is positioned on the circumferential track 3 and can move along the circumferential track 3;

the continuous compression state light source 1 comprises a laser, a frequency doubling device, an optical parametric amplification device and a feedback control system; continuous laser with the wavelength of 1064nm output by the laser enters the frequency doubling device, laser with the wavelength of 532nm emitted from the frequency doubling device is used as a pumping source to enter the optical parametric amplification device, and the laser with the wavelength of 1064nm output from the optical parametric amplification device is continuous compression state laser, namely quantum light. Quantum light has high compression degree, amplitude fluctuation is small, the signal-to-noise ratio can break through shot noise limit, compared with conventional laser detection, the quantum light has stronger anti-jamming capability, the application value of a detection system in a strong interference environment can be improved, the detection distance of a high-power conventional laser light source can be reached or even exceeded under the condition of small output power, the detection limit of conventional laser detection can be broken through, the detection performance of a low-visible target is improved, the detection means of the target is enriched, the technical limitation of the conventional laser radar in the detection aspect is broken through, the quantum light has important application potential in the field of laser radar detection and imaging recognition, only low-power detection light needs to be output, and the power consumption and the volume of the detection light source are greatly reduced.

The main structures of the frequency doubling device and the optical parametric amplification device are an optical resonant cavity and a nonlinear crystal positioned in the optical resonant cavity. The feedback control system of the continuous compression state light source 1 has the functions of controlling the temperature of the nonlinear crystal to enable the nonlinear crystal to achieve the optimal phase matching and controlling the cavity length of an optical resonant cavity of a frequency doubling device and an optical parametric amplification device to enable laser output by the continuous compression state light source 1 to be more stable, and specifically adopts a temperature controller, piezoelectric ceramics, a multi-channel PID system, a multi-channel high-voltage amplifier and the like.

The continuous compression state laser is divided into two beams, one beam is used as local light, and the other beam is used as probe light.

The attitude simulation system 2 can realize parameter conversion from a target coordinate system to an attitude simulation system self coordinate system by changing an upper rotating angle, a lower rotating angle, an arc angle and a circumferential angle, simulate irradiation of continuous compression state quantum irradiation light on different pitch angles and azimuth angles of a target model, and simulate detection of a detection device on the target model at different pitch angles and azimuth angles. The target to be measured is placed on the attitude simulation system 2, the pitch angle and the azimuth angle of the target to be measured are adjusted, so that the probe light irradiates the target to be measured, the probe light interacts with the target to be measured, and the quantum scattering characteristic parameters of the typical target, such as the energy density distribution of the quantum scattering field of the continuous compressed light (namely echo signal) after interaction, can be changed.

The quantum echo high-order correlation detection system 4 comprises a phase modulator, a balanced homodyne detection device and two detectors. The balanced homodyne detection device can move along the circumferential track 3, and the position of the balanced homodyne detection device is adjusted, so that the balanced homodyne detection device can receive echo signals at different angles. When the phase difference between the local light and the echo signal meets a certain condition, the correlation characteristic between the local light and the echo signal is strongest, so that the phase of the local light is modulated by adopting phase modulation, the state of the continuous compression state quantum echo signal rotates in a phase space, namely, the detection noise is converted between phase noise and amplitude noise, and the noise intensity of a signal field is amplified. The local light after phase modulation and the echo signal returned by the target to be detected are coupled on the balanced homodyne detection device, the local light and the echo signal transmitted by the balanced homodyne detection device are respectively received by the two detectors, and the detectors convert the detected light signal into an electric signal and input the electric signal into the signal processing system 5.

The signal processing system 5 performs high-order correlation processing on the obtained phase and amplitude information of the echo signal to obtain phase and amplitude correlation characteristics of the continuous compression state quantum echo signal and the continuous compression state quantum local light, and then analyzes and processes the correlation characteristics to obtain quantum characteristic information such as the phase and amplitude of the target echo signal.

Fig. 2 is a schematic flow chart of a target echo detection method based on continuous compression state laser according to an embodiment of the present invention. The target echo detection method based on the continuous compression state laser in the embodiment of the present invention is a method for detecting a target echo by using a target echo detection system based on the continuous compression state laser in the embodiment of the present invention, and the method may generally include:

s1, placing the target to be detected on an attitude simulation system, placing the attitude simulation system at the center of a circumferential track, and placing a balanced homodyne detection device on the circumferential track;

step S2, dividing the continuous compression state laser output by the continuous compression state light source into two beams, wherein one beam is used as local light, the phase of the local light is adjusted by using a phase modulator, and the other beam is used as probe light;

step S3, controlling the attitude simulation system to enable the probe light to irradiate the target to be detected at different pitch angles and azimuth angles;

step S4, adjusting the position of the balanced homodyne detection device on the circumferential track, so that the balanced homodyne detection device receives the laser reflected by the target to be detected, i.e. the echo signal, at different angles, and the balanced homodyne detection device receives the echo signal and at the same time, irradiates the phase-modulated local light on the balanced homodyne detection device;

step S5, respectively detecting local light and echo signals transmitted by the balanced homodyne detection device by using two detectors;

and step S6, analyzing the signals detected by the two detectors to obtain quantum characteristic information in the echo signal of the target to be detected.

As a preferred embodiment of the present invention, the continuous compression state light source includes a laser, a frequency doubling device and an optical parametric amplification device; and continuous laser output by the laser enters the frequency doubling device, laser emitted from the frequency doubling device enters the optical parametric amplification device as a pumping source, and the laser output from the optical parametric amplification device is compressed laser.

As a preferred embodiment of the present invention, the continuous compression state light source further comprises a feedback control system, the feedback control system comprises a temperature control module and a cavity length control module:

the temperature control module is used for controlling the temperature of the nonlinear crystals in the frequency doubling device and the optical parametric amplification device;

and the cavity length control module is used for controlling the cavity lengths of the frequency doubling device and the optical parametric amplification device.

As a preferred embodiment of the present invention, the analyzing the signals detected by the two detectors to obtain the LRCS of the target to be detected includes:

performing high-order correlation processing on the phase and amplitude information of the detected echo signal to obtain the phase and amplitude correlation characteristics of the echo signal and the local light;

and analyzing and processing the phase and amplitude correlation characteristics of the echo signal and the local light to obtain quantum characteristic information in the echo signal of the target to be detected.

The principle and effect of the target echo detection method based on continuous compression state laser in the embodiment of the invention are the same as those of the target echo detection system based on continuous compression state laser in the embodiment of the invention, and are not repeated here.

It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the specific embodiments described and illustrated in detail herein, and that various changes may be made therein by those skilled in the art without departing from the scope of the invention as defined by the appended claims.