CN-122017817-A - Infrared radiation spectrum passive distance estimation method based on interval guiding strategy

CN122017817ACN 122017817 ACN122017817 ACN 122017817ACN-122017817-A

Abstract

The invention provides an infrared radiation spectrum passive distance estimation method based on an interval guiding strategy, which is applied to the field of passive distance measurement and comprises the steps of obtaining a target radiance spectrum; performing gradient descent optimization through an infrared radiation transmission ranging model based on a target radiance spectrum and an initial atmospheric average absorption coefficient to obtain an initial distance estimation value, performing iteration until the distance estimation value meets interval discrimination conditions to obtain a target distance estimation value, judging the position relation between a current distance estimation value and a current calibration interval, selecting an atmospheric average absorption coefficient of a corresponding calibration interval from an atmospheric average absorption coefficient distance-spectrum vector based on the position relation, performing gradient descent optimization through the infrared radiation transmission ranging model based on the target radiance spectrum and the atmospheric average absorption coefficient, and updating the distance estimation value. The invention can effectively improve the overall accuracy level of distance measurement in the complete detection range of the infrared spectrum measurement system.

Inventors

SHI ZHENGYANG
WEN QIN
ZHANG JIE
ZHANG GUIFENG
HUANG MIN
Luo Fengkun
Yong Gaofeng
ZHAO XUEHUI
HAN WEI
QIAN LULU

Assignees

中国科学院空天信息创新研究院

Dates

Publication Date: 20260512
Application Date: 20260212

Claims (11)

1. The method for estimating the passive distance of the infrared radiation spectrum based on the interval guiding strategy is characterized by comprising the following steps of: acquiring a target radiance spectrum, wherein the target radiance spectrum is a radiance value of a target actually measured by an infrared spectrum measuring system under a plurality of wavelengths; Performing gradient descent optimization through an infrared radiation transmission ranging model based on the target radiance spectrum and an initial atmospheric average absorption coefficient in a pre-constructed atmospheric average absorption coefficient distance-spectrum vector to obtain an initial distance estimation value, wherein the atmospheric average absorption coefficient distance-spectrum vector comprises a plurality of calibration distances and atmospheric average absorption coefficients corresponding to each calibration distance; the following steps are iteratively executed until the distance estimated value meets the interval discrimination condition, and the target distance estimated value is obtained: judging the position relation between the current distance estimation value and the current calibration interval, wherein the calibration interval is a continuous range defined by adjacent calibration distances; Based on the position relation, selecting an atmospheric average absorption coefficient of a corresponding calibration interval from the atmospheric average absorption coefficient distance-spectrum vector; And on the basis of the target radiance spectrum and the atmospheric average absorption coefficient, performing gradient descent optimization through the infrared radiation transmission ranging model, and updating a distance estimation value.
2. The method for passive distance estimation of infrared radiation spectrum based on interval guidance strategy according to claim 1, wherein the infrared radiation transmission ranging model is expressed by the following formula: ; Wherein, the Representing the monochromatic radiance of a predicted radiance spectrum before reaching the infrared spectrum measurement system, wherein the predicted radiance spectrum is used for calculating a prediction error with the target radiance spectrum in the gradient descent optimization process; Indicating the atmospheric transmittance and the atmospheric absorption coefficient Is determined by the average absorption coefficient of the atmosphere, The distance estimation value to be optimized; representing the spectrum of the target emissivity, Representing the planck blackbody radiation equation, The target temperature is indicated as such, The temperature of the atmosphere is indicated, Representing wavelength.
3. The interval guidance strategy-based passive distance estimation method of infrared radiation spectrum according to claim 2, wherein the gradient descent optimization is performed by the infrared radiation transmission ranging model based on the target radiance spectrum and the atmospheric average absorption coefficient, and updating a distance estimation value comprises: minimizing a loss function of the infrared radiation transmission ranging model through a gradient descent algorithm based on the target radiance spectrum and the atmospheric average absorption coefficient, and jointly optimizing and updating a distance estimated value, a target temperature and a target emissivity spectrum, wherein the loss function comprises the following steps: ; Wherein, the The loss function is represented by a function of the loss, Representing a measure of the loss term, Representing the term of the regularization constraint, Representing the predicted radiance spectrum, Representing the spectrum of the target radiance, The regularization coefficient is represented as a function of the regularization coefficient, Respectively representing the distance estimate, the target temperature and the target emissivity spectrum, The number of wavelength points is represented, Representing the wavelength index.
4. The interval guidance strategy based infrared radiation spectrum passive distance estimation method according to claim 1, wherein the method further comprises: Determining an atmospheric transmittance spectrum corresponding to each calibration distance; determining the radiance spectrum of a standard blackbody at a preset temperature based on the Planckian blackbody radiation law; Determining the radiance spectrum attenuated by the atmosphere through a radiation transmission model based on the atmospheric transmittance spectrum and the radiance spectrum of the standard blackbody; Based on the instrument function of the infrared spectrum measuring system, carrying out convolution operation on the radiance spectrum of the standard black body and the radiance spectrum attenuated by the atmosphere respectively to obtain an initial spectrum and an attenuated spectrum after instrument response; Based on lambert-beer law, according to the initial spectrum, the attenuated spectrum and the corresponding calibration distances, determining an atmospheric average absorption coefficient corresponding to each calibration distance, wherein the method comprises the following steps: Wherein, the Represents the monochromatic radiance of the attenuated spectrum, Represents the monochromatic radiance of the initial spectrum, Indicating the average absorption coefficient of the atmosphere, Representing the calibrated distance.
5. The interval guidance strategy based infrared radiation spectrum passive distance estimation method according to claim 4, wherein the method further comprises: determining an interval of a calibration distance based on an allowable error of the infrared spectrum measurement system, wherein the interval comprises the following steps: Wherein, the Represent the first The distance to be calibrated is set, Representing the minimum detection distance of the infrared spectrometry system, Represents an index of an integer number, Representing the statistical expectation of the range under the allowable error of the infrared spectrum measuring system.
6. The method for estimating the passive distance of the infrared radiation spectrum based on the interval guidance strategy according to claim 1, wherein the determining the positional relationship between the current distance estimation value and the current calibration interval comprises: when the current distance estimated value is positioned in the current calibration interval and the difference value between the current distance estimated value and the upper boundary of the current calibration interval is smaller than half of the calibration distance interval, judging that the current distance estimated value is close to the upper boundary of the interval; When the current distance estimated value is positioned in the current calibration interval and the difference value between the current distance estimated value and the lower boundary of the current calibration interval is smaller than half of the calibration distance interval, judging that the current distance estimated value is close to the lower boundary of the interval; and when the current distance estimated value is not located in the current calibration interval, judging that the current distance estimated value is located outside the calibration interval.
7. The method for estimating the passive distance of the infrared radiation spectrum based on the interval guidance strategy according to claim 5, wherein the selecting the atmospheric average absorption coefficient of the corresponding calibration interval from the atmospheric average absorption coefficient distance-spectrum vector based on the positional relationship comprises: If the upper boundary of the current calibration interval is judged to be close to the upper boundary of the interval, selecting an atmospheric average absorption coefficient corresponding to a new calibration interval taking the upper boundary of the current calibration interval as a lower boundary; If the current atmospheric average absorption coefficient and the current atmospheric average absorption coefficient are judged to be close to the lower boundary of the interval, confirming that the current atmospheric average absorption coefficient and the current atmospheric average absorption coefficient are both effective values; and if the air absorption coefficient is judged to be located outside the calibration interval, selecting an air average absorption coefficient corresponding to a new calibration interval comprising the current distance estimated value.
8. An interval guidance strategy-based infrared radiation spectrum passive distance estimation system, comprising: the acquisition module is used for acquiring a target radiance spectrum, wherein the target radiance spectrum is a radiance value of a target actually measured by the infrared spectrum measurement system under a plurality of wavelengths; The estimating module is used for carrying out gradient descent optimization through an infrared radiation transmission ranging model based on the target radiance spectrum and an initial atmospheric average absorption coefficient in a pre-constructed atmospheric average absorption coefficient distance-spectrum vector to obtain an initial distance estimated value, wherein the atmospheric average absorption coefficient distance-spectrum vector comprises a plurality of calibration distances and atmospheric average absorption coefficients corresponding to each calibration distance; the updating module is used for iteratively executing the following steps until the distance estimated value meets the interval discrimination condition to obtain the target distance estimated value: judging the position relation between the current distance estimation value and the current calibration interval, wherein the calibration interval is a continuous range defined by adjacent calibration distances; Based on the position relation, selecting an atmospheric average absorption coefficient of a corresponding calibration interval from the atmospheric average absorption coefficient distance-spectrum vector; And on the basis of the target radiance spectrum and the atmospheric average absorption coefficient, performing gradient descent optimization through the infrared radiation transmission ranging model, and updating a distance estimation value.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and running on the processor, characterized in that the processor implements the interval guidance strategy based infrared radiation spectrum passive distance estimation method according to any one of claims 1 to 7 when executing the computer program.
10. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the interval guidance strategy based infrared radiation spectrum passive distance estimation method according to any of claims 1 to 7.
11. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements the method for passive distance estimation of the infrared radiation spectrum based on the interval guidance strategy as claimed in any one of claims 1 to 7.

Description

Infrared radiation spectrum passive distance estimation method based on interval guiding strategy Technical Field The invention relates to the technical field of passive distance measurement, in particular to an infrared radiation spectrum passive distance estimation method based on an interval guiding strategy. Background The passive distance measurement does not need active light projection, has the advantages of low energy consumption, high concealment and strong applicability, and is widely applied to the fields of satellite remote sensing, military investigation, industrial production and the like. Based on the correlation of the atmospheric infrared radiation attenuation and the wavelength, the passive distance measurement is realized by utilizing the lambert-beer law and the transmission theory of infrared radiation in the atmosphere, and the infrared radiation infrared sensor has the characteristics of stealth, passivity, independence from texture characteristics and suitability for dark conditions. In the related art, the influence of the spectrum resolution of the infrared detection system under the actual measurement condition is not considered in the distance calculation process, the high-resolution atmospheric transmittance spectrum curve of the atmospheric simulation platform is directly called as a known parameter, and compared with the actual measurement spectrum line, the error is larger, so that the distance measurement precision is low, and the measurement range is small. Therefore, the infrared radiation spectrum distance measuring method in the related technology has the technical problems of small measuring range and low distance measuring precision. Disclosure of Invention The invention provides an infrared radiation spectrum passive distance estimation method based on an interval guiding strategy, which is used for solving the defects of small measuring range and low distance measuring precision of an infrared radiation spectrum distance measurement method in the prior art and improving the distance measuring precision and the measuring range. The invention provides an infrared radiation spectrum passive distance estimation method based on an interval guiding strategy, which comprises the following steps of. The method comprises the steps of obtaining a target radiance spectrum, wherein the target radiance spectrum is a radiance value of a target actually measured through an infrared spectrum measuring system under a plurality of wavelengths, carrying out gradient descent optimization through an infrared radiation transmission ranging model based on the target radiance spectrum and an initial atmospheric average absorption coefficient in a pre-built atmospheric average absorption coefficient distance-spectrum vector to obtain an initial distance estimated value, the atmospheric average absorption coefficient distance-spectrum vector comprises a plurality of calibration distances and atmospheric average absorption coefficients corresponding to each calibration distance, carrying out iteration execution until the distance estimated value meets interval discrimination conditions to obtain a target distance estimated value, judging the position relation between a current distance estimated value and a current calibration interval, wherein the calibration interval is a continuous range defined by adjacent calibration distances, selecting an atmospheric average absorption coefficient corresponding to the calibration interval from the atmospheric average absorption coefficient distance-spectrum vector based on the position relation, carrying out gradient descent optimization through the infrared radiation transmission ranging model based on the target radiance spectrum and the atmospheric average absorption coefficient, and updating the distance estimated value. According to the infrared radiation spectrum passive distance estimation method based on the interval guiding strategy, the infrared radiation transmission ranging model is expressed by the following formula: ; Wherein, the Representing the monochromatic radiance of a predicted radiance spectrum before reaching the infrared spectrum measurement system, wherein the predicted radiance spectrum is used for calculating a prediction error with the target radiance spectrum in the gradient descent optimization process; Indicating the atmospheric transmittance and the atmospheric absorption coefficient Is determined by the average absorption coefficient of the atmosphere,The distance estimation value to be optimized; representing the spectrum of the target emissivity, Representing the planck blackbody radiation equation,The target temperature is indicated as such,The temperature of the atmosphere is indicated,Representing wavelength. According to the method for estimating the passive distance of the infrared radiation spectrum based on the interval guiding strategy, the gradient descent optimization is performed through the infrared radiat