Laser altimeter cloud scattering error correction method and device
An error correction and deviation correction technology, which is applied in the field of satellite laser altimetry, can solve problems such as the inability to correct the height measurement results, and achieve the effect of accurate altimetry deviation correction value and simple calculation process
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Embodiment 1
[0030] Satellite laser altimetry is a technology that can obtain sub-meter or even centimeter-level elevation information at high frequency and in a wide range, and has become one of the important means of earth observation. When using satellite laser altimetry, in order to ensure the elevation accuracy of the acquired data, cloud is a factor that cannot be ignored. And the researchers found that the influence of clouds on satellite laser altimetry mainly comes from the multiple scattering effect. Based on this finding, the researchers simulated the impact of cloud multiple scattering on the accuracy of laser altimetry data under specific conditions based on the semi-analytic Monte Carlo method. The results show that the altimetry deviation is related to various factors such as cloud layer height, cloud effective particle radius, cloud optical thickness, concentration, etc. Therefore, the altimetry deviation must be corrected based on real-time atmospheric observation parameter...
Embodiment 2
[0093] The embodiment of this case provides a kind of laser altimeter cloud scattering error correction device, such as Figure 5 shown, including:
[0094] The echo waveform data acquisition module 10 is used to acquire the echo waveform data of the altimetry laser, and the echo waveform data includes echo power at different altitudes. For a detailed description, see the description of step S10 in the above-mentioned embodiment 1.
[0095] The original altimetry data calculation module 20 is used to calculate the original altimetry data according to the echo waveform data. For a detailed description, refer to the description of step S20 in the first embodiment above.
[0096] The backscatter coefficient calculation module 30 is configured to calculate the backscatter coefficient and extinction coefficient at different altitudes according to the echo power. For detailed description, refer to the description of step S30 in the above-mentioned embodiment 1.
[0097] The cloud d...
Embodiment 3
[0104] The present invention also provides a computer device, such as Figure 6 As shown, the computer device mainly includes one or more processors 91 and memory 92, Figure 6 A processor 91 is taken as an example.
[0105] The computer device may also include: an input device 99 and an output device 94 .
[0106] Processor 91, memory 92, input device 99 and output device 94 can be connected by bus or other ways, Figure 6 Take connection via bus as an example.
[0107] The processor 91 may be a central processing unit (Central Processing Unit, CPU). Processor 91 can also be other general processors, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-Programmable Gate Array, FPGA) or Other chips such as programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above-mentioned ty...
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