Simulation method for dynamic high maneuvering target in pulse laser ranging

Abstract

The invention discloses a simulation method for a dynamic high maneuvering target in pulse laser ranging, and the method comprises the steps: constructing a moving target simulator; then, according to the absolute target object distance, the flight speed and the flight acceleration of the moving target needing to be simulated and the repetition frequency of the laser range finder, the pulse intensity, the pulse string interval value and the interval change value of echo laser of the moving target are calculated and set in a motion characteristic waveform generator; the motion characteristic waveform generator is linked with the continuous variable-frequency pulse light source to generate an analog echo pulse with variable intensity and variable pulse interval, and the photoelectric detector performs photoelectric conversion, analog amplification and comparison on the received pulse laser to generate a digital pulse to trigger the motion characteristic waveform generator and the continuous variable-frequency pulse light source; echo laser pulses are generated and irradiated to the laser range finder, and the laser range finder carries out distance calculation on the dynamic high-maneuvering target by simulating the arrival time of the echo laser pulses. According to the method, indoor simulation and testing of the dynamic high-maneuvering target by the laser range finder can be realized.

Description

Technical Field

[0001] The invention belongs to the technical field of pulse laser ranging, and in particular relates to a simulation method for a dynamic high-maneuverability target in pulse laser ranging. Background Art

[0002] Pulse laser ranging uses light waves as the ranging carrier and realizes high-precision, non-contact ranging of the target based on the time-of-flight method. It transmits one or more high-energy pulse lasers to the target at the ranging point. After the pulse laser reaches the target, it will reflect a part of the light and be received by the photoelectric detector at the measured point. According to the time domain correlation of the received light signal, the time difference between the transmitted and received light signals is obtained, and then the ranging value is calculated. It is widely used in the fields of vehicle-mounted laser radar, surveying and mapping, military reconnaissance, etc.

[0003] Pulse laser ranging is divided into single-pulse high-energy laser ranging and multi-pulse low-energy laser ranging. Single-pulse high-energy laser ranging is a technology that uses the high peak power of the laser to achieve target ranging. Its maximum repetition frequency is generally in the range of tens of Hz. Multi-pulse low-energy laser ranging is different from single-pulse high-energy laser ranging. It uses the high repetition frequency of the laser to achieve target ranging. The laser emission repetition frequency is generally from several kHz to hundreds of kHz.

[0004] Range finding target simulation is an important test system for detecting the performance parameters and indicators of laser range finders. It can detect and evaluate the performance of laser range finders indoors. In view of the requirements for the recognition and tracking of dynamic and highly maneuverable targets in current optoelectronic systems, traditional laser range finding target simulation test systems such as Figure 1 As shown, a photoelectric detector, a time delay device with a fixed interval and an echo laser generator connected in sequence constitute a rangefinder target simulator. The simulation method based on this simulator can only simulate the test of fixed and stationary targets, and cannot simulate dynamic and highly maneuverable targets. Summary of the invention

[0005] The object of the present invention is to provide a simulation method for a dynamic and highly maneuverable target in pulse laser ranging, so as to solve the simulation of a dynamic and highly maneuverable target in laser ranging.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a simulation method for dynamic high-maneuverability targets in pulse laser ranging, comprising the following steps: S1, a photoelectric detector, a variable-interval motion characteristic waveform generator, and a continuously variable-frequency pulse light source are sequentially connected to construct a moving target simulator; S2, determination of motion characteristic parameters: calculating the pulse intensity, pulse train interval value and interval change value of the echo laser of the moving target according to the absolute target distance, flight speed and flight acceleration of the moving target to be simulated and the repetition frequency of the laser rangefinder; S3, setting the parameters in step S2 into the motion characteristic waveform generator, and linking it with the continuously variable frequency pulse light source to generate simulated echo pulses with variable intensity and variable pulse interval; S4, when the laser rangefinder emits a ranging pulse laser to illuminate the photoelectric detector at the receiving end of the moving target simulator, the photoelectric detector converts the received pulse laser into photoelectric, analog amplifies and compares it to generate a digital pulse, triggers the motion characteristic waveform generator and the continuously variable frequency pulse light source, and generates a same-band echo laser pulse with a variable pulse interval to illuminate the receiving telescope of the laser rangefinder; S5, the laser rangefinder calculates the distance to the moving target by simulating the arrival time of the echo laser pulse.

[0007] Furthermore, when using a 1Khz high repetition rate 1550nm laser rangefinder to conduct indoor moving target ranging capability and precision ranging tests and simulations, the laser radar equation is first used to calculate its working parameters and the target reflection cross section and reflectivity parameters to obtain the output pulse intensity required for the simulated echo. P r : ,in P t is the peak power emitted by the laser rangefinder, σ is the atmospheric extinction coefficient, V is the atmospheric visibility, β is the target reflectivity, R is the target distance, T t is the transmission system efficiency, T r For receiving system efficiency, A r The effective area of ​​the receiving telescope of the rangefinder is obtained; the pulse interval parameters and the interval variation parameters are obtained from the target motion characteristic parameters and input into the motion characteristic waveform generator; the motion characteristic waveform generator and the continuously variable frequency pulse light source output a simulated 1550nm pulse laser string signal whose intensity varies with the distance, and the pulse interval and the interval variation rate vary with the target motion parameters; the pulse laser string signal is then irradiated into the receiving telescope of the laser rangefinder; the ranging value output by the laser rangefinder is compared with the simulated value, thereby realizing the ranging capability and ranging accuracy test and simulation of the 1Khz high repetition rate 1550nm laser ranging system for moving targets.

[0008] Furthermore, for a large moving target with a speed of 30 km, 1 km / s and a reflectivity of 0.3, the photoelectric detector calculates the peak value of the simulated echo laser pulse 01nW, the standard pulse interval 200us and the interval increment T*V / C through the laser radar equation according to the emission energy of the laser rangefinder, the efficiency of the transceiver system and the coupling efficiency of the moving target to be measured.

[0009] Furthermore, the photoelectric detector sends the above-mentioned peak value, standard pulse interval and interval increment parameters to the motion characteristic waveform generator through the serial port, and the motion characteristic waveform generator adjusts the peak value and trigger pulse interval time of the continuous variable frequency pulse light source in real time.

[0010] Furthermore, when the laser rangefinder is measuring distance, the laser rangefinder emits a 1550nm pulse light, the photoelectric detector of the passive target simulator receives and triggers the motion characteristic waveform generator and the continuously variable frequency pulse light source to generate a 1550nm laser pulse with a peak power of 10nW, and the rangefinder receiving end receives and processes it, thereby realizing a simulation experiment of measuring the distance of a long-distance moving target in the laboratory.

[0011] The beneficial effects of the present invention are as follows: the present invention realizes the simulation of dynamic and highly maneuverable targets by introducing high-repetition-rate variable-frequency light source technology and high-speed echo signal simulation technology into a laser ranging target simulation system; based on a traditional target simulation pulse echo device, the present invention utilizes motion waveform construction technology and high-repetition-rate variable-frequency light source technology to dynamically adjust the echo string interval within the ranging time in real time according to the target object distance, flight speed and flight acceleration, thereby realizing the simulation of dynamic and highly maneuverable targets; the method of the present invention can realize the indoor simulation and test of the dynamic and highly maneuverable targets by the laser rangefinder, can be used as a test and inspection means for the dynamic target algorithm provided by the multi-pulse laser rangefinder, and has direct economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the traditional laser ranging target simulation system; Figure 2 It is a structural schematic diagram of the laser ranging moving target simulation system of the present invention; Figure 3 It is a schematic diagram of the variable pulse interval echo generated by the laser ranging moving target simulation system.

[0013] The reference numerals of the figures are: 01—photoelectric detector, 02—motion characteristic waveform generator, 03—continuously variable frequency pulse light source, 04—laser rangefinder. DETAILED DESCRIPTION

[0014] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the examples of the present invention. Obviously, the described embodiment is only one embodiment of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative labor are within the scope of protection of the present invention.

[0015] Reference Figure 2 As shown, the present invention discloses a simulation method for dynamic high-maneuverability targets in pulse laser ranging, which includes the following steps.

[0016] S1, sequentially connect the photoelectric detector 01, the variable-interval motion characteristic waveform generator 02 and the continuously variable-frequency pulse light source 03 to construct a moving target simulator.

[0017] S2, determination of motion characteristic parameters: the pulse intensity, pulse train interval value and interval change value of the echo laser of the moving target are calculated according to the absolute target distance, flight speed and flight acceleration of the dynamic high-maneuverability target to be simulated and the repetition frequency of the laser rangefinder 04.

[0018] S3, setting the parameters in step S2 into the motion characteristic waveform generator 02, and linking with the continuously variable frequency pulse light source 03 to generate simulated echo pulses with variable intensity and variable pulse interval.

[0019] S4, when the laser rangefinder 04 emits a ranging pulse laser to illuminate the photoelectric detector 01 at the receiving end of the moving target simulator, the photoelectric detector 01 converts the received pulse laser into photoelectric, analog amplifies and compares it to generate a digital pulse, triggering the motion characteristic waveform generator 02 and the continuously variable frequency pulse light source 03 to generate an echo laser pulse of the same band with a variable pulse interval to illuminate the receiving telescope of the laser rangefinder 04.

[0020] S5, the laser rangefinder 04 calculates the distance to the moving target by simulating the arrival time of the echo laser pulse.

[0021] In a further embodiment, for a 1Khz high repetition rate 1550nm laser rangefinder 04, when conducting indoor moving target ranging capability and precision ranging test and simulation, firstly, the laser radar equation is used to calculate its working parameters and target characteristic parameters to obtain the simulated echo output pulse intensity, pulse interval parameters and interval variation parameters, which are input into the motion characteristic waveform generator 02. The motion characteristic waveform generator 02 and the continuously variable frequency pulse light source 03 output a simulated 1550nm pulse laser train signal whose intensity varies with distance, and whose pulse interval and interval variation rate vary with target motion parameters. Then, the pulse laser train signal is irradiated into the receiving telescope of the laser rangefinder 04. The ranging value output by the laser rangefinder 04 is compared with the simulation value, thereby realizing the moving target ranging capability and ranging precision test and simulation of the 1Khz high repetition rate 1550nm laser ranging system.

[0022] The laser radar equation is , where P t is the peak power emitted by the laser rangefinder, σ is the atmospheric extinction coefficient, V is the atmospheric visibility, β is the target reflectivity, R is the target distance, T t is the transmission system efficiency, T r For receiving system efficiency, A r It is the effective area of ​​the rangefinder receiving telescope.

[0023] In the embodiment, for a large moving target with a speed of 30 km, 1 km / s and a reflectivity of 0.3, the peak value 01 nW of the simulated echo laser pulse, the standard pulse interval of 200 us and the interval increment T*V / C (wherein the laser period T is 1 / F, V is the target movement speed, and C is the speed of light) are calculated by the laser radar equation according to the emission energy of the laser rangefinder 04, the efficiency of the transceiver system and the coupling efficiency of the moving target to be measured.

[0024] In the embodiment, the above peak value, standard pulse interval and interval increment parameters are sent to the motion characteristic waveform generator 02 through the serial port, and the motion characteristic waveform generator 02 adjusts the peak value and trigger pulse interval time of the continuously variable frequency pulse light source in real time.

[0025] When the laser rangefinder 04 is measuring distance, it emits 1550nm pulse light, which is received by the photoelectric detector 01 of the passive target simulator and triggers the motion characteristic waveform generator 02 and the continuously variable frequency pulse light source 03 to generate a 1550nm laser pulse with a peak power of 10nW, which is then received and processed by the receiving end of the rangefinder system, thereby realizing a simulation experiment of measuring the distance of a long-distance moving target in the laboratory.

[0026] The above embodiments are only illustrative of the principles and effects of the present invention, as well as some embodiments of its application. For those skilled in the art, several modifications and improvements may be made without departing from the creative concept of the present invention, and all of these belong to the protection scope of the present invention.

Claims

1. A method for simulating dynamic and highly maneuverable targets in pulse laser ranging, characterized in that: The following steps are included S1, sequentially connects a photoelectric detector (01), a variable-interval motion characteristic waveform generator (02), and a continuously variable-frequency pulse light source (03) to construct a moving target simulator; S2, calculating the pulse intensity, pulse train interval value and interval change value of the echo laser of the dynamic high maneuverable target according to the absolute target distance, flight speed and flight acceleration of the dynamic high maneuverable target and the repetition frequency of the laser rangefinder (04); S3, setting the parameters in step S2 into the motion characteristic waveform generator (02), and linking with the continuously variable frequency pulse light source (03) to generate simulated echo pulses with variable intensity and variable pulse interval; S4, the laser rangefinder (04) emits a ranging pulse laser to irradiate the photoelectric detector (01), and the photoelectric detector (01) converts the received pulse laser into photoelectric, analog amplifies and compares it to generate a digital pulse, triggers the motion characteristic waveform generator (02) and the continuously variable frequency pulse light source (03), and generates a same-band echo laser pulse with a variable pulse interval to irradiate the receiving telescope of the laser rangefinder (04); S5, the laser rangefinder (04) calculates the distance to the dynamic and highly maneuverable target by simulating the arrival time of the echo laser pulse.

2. A method for simulating dynamic high-maneuverability targets in pulse laser ranging according to claim 1, characterized in that: When using a 1Khz high repetition rate 1550nm laser rangefinder (04), first use the laser radar equation The working parameters and the target reflection cross section and reflectivity parameters are calculated to obtain the output pulse intensity required for the simulated echo. P r , where P t is the peak power emitted by the laser rangefinder, σ is the atmospheric extinction coefficient, V is the atmospheric visibility, β is the target reflectivity, R is the target distance, T t is the transmission system efficiency, T r For receiving system efficiency, A r The invention relates to an effective area of ​​a receiving telescope of a rangefinder; a pulse interval parameter and an interval variation parameter are obtained from target motion characteristic parameters and input into a motion characteristic waveform generator (02); the motion characteristic waveform generator (02) and a continuously variable frequency pulse light source (03) output a simulated 1550nm pulse laser train signal whose intensity varies with distance, and whose pulse interval and interval variation rate vary with target motion parameters; the pulse laser train signal is then irradiated onto a laser rangefinder (04); and a distance measurement value output by the laser rangefinder (04) is compared with the simulated value.

3. A method for simulating dynamic high-maneuverability targets in pulse laser ranging according to claim 2, characterized in that: The photoelectric detector (01) calculates the peak value of the echo laser pulse, the standard pulse interval and the interval increment according to the emission energy of the laser rangefinder (04), the efficiency of the transceiver system and the coupling efficiency of the dynamic high-maneuvering target through the laser radar equation.

4. A method for simulating dynamic high-maneuverable targets in pulse laser ranging according to claim 1, 2 or 3, characterized in that: The photoelectric detector (01) sends the peak value, standard pulse interval and interval progression to the motion characteristic waveform generator (02) via a serial port, and the motion characteristic waveform generator (02) adjusts the peak value of the pulse light source and the trigger pulse interval time in real time.

5. The method for simulating a dynamic high-maneuverability target in pulse laser ranging according to claim 4, characterized in that: The laser rangefinder (04) emits 1550nm pulse light, which is received by the photodetector (01) and triggers the motion characteristic waveform generator (02) and the continuously variable frequency pulse light source (03) to generate 1550nm laser pulses with a peak power of 10nW.

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