System parameter design and transmission power optimization method of multi-mode small satellite SAR in scanning mode

A technology of scanning mode and system parameters, applied in radio wave measurement systems, instruments, measurement devices, etc., can solve the problems of not introducing sub-strip position parameters and time parameters, and not considering transmission power optimization, etc., to improve the boot time. Effect

Active Publication Date: 2021-10-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Document K. Tomiyasu, "Conceptual performance of a satellite borne, wideswath synthetic aperture radar," IEEE Trans.Geosci.Remote Sens., vol.GE-19, no.2, pp.108-116, Apr.1981. The performance parameters and design constraints of SAR such as scanning period, resolution, number of wave positions, antenna area, observation bandwidth, average transmit power and echo data rate are discussed in detail and comprehensively, but it does not introduce how to determine the The location parameters and time parameters of the belt, etc., did not consider the problem of transmitting power optimization

Method used

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  • System parameter design and transmission power optimization method of multi-mode small satellite SAR in scanning mode
  • System parameter design and transmission power optimization method of multi-mode small satellite SAR in scanning mode
  • System parameter design and transmission power optimization method of multi-mode small satellite SAR in scanning mode

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Embodiment 1

[0116] combine figure 1 , a system parameter design method for multi-mode small-satellite SAR in scanning mode, comprising the following steps:

[0117] The system parameter design of small satellite SAR in scanning mode needs to determine the system working parameters such as antenna size, signal bandwidth, pulse repetition frequency, number of scanning waves, position of each sub-strip, and time relationship of each sub-strip. In order to determine the above working parameters, parameters such as distance resolution, azimuth resolution, survey zone, satellite orbit height, and pulse width are often known or given.

[0118] Step 1: Determine the number of scanning waves.

[0119] Scan wave number N B It is related to the scanning time of each sub-strip (that is, the full-aperture imaging accumulation time corresponding to the beam width) and the beam dwell time (that is, the time for one burst continuous imaging of a certain sub-strip).

[0120] Let k represent the number ...

Embodiment 2

[0190] The sea surface can be regarded as a composite rough surface composed of a slightly rough surface superimposed on a large wave structure. The large wave structure causes the inclination of the slightly rough surface to form a so-called "dual-scale model". The small-scale capillary wave component in the dual-scale model and large-scale long-wave components respectively correspond to two backscattering mechanisms of high-frequency electromagnetic waves from the sea: Bragg scattering at oblique incidence and specular reflection at near-normal incidence. For both SAR and scatterometers, the incident angle is relatively large, so Bragg scattering is the main scattering component.

[0191] The expression of the Bragg scattering component is:

[0192]

[0193] In the formula, σ 0 is the normalized backscattering coefficient, θ is the incident angle, g ij (θ) is the first-order scattering coefficient related to the polarization mode, S PM is the two-dimensional PM spectru...

Embodiment 3

[0209] Verify the rationality of the system parameter design method for multi-mode small satellite SAR in scanning mode.

[0210] The sea surface simulation method used

[0211] In order to simulate the small satellite SAR ocean scene echo, it is first necessary to simulate the sea surface. At present, the main method for sea surface simulation is to generate wave spectrum first, and then simulate the sea surface according to the wave spectrum. The wave spectrum is the power density spectrum of the sea surface, which is the Fourier transform of the sea surface height fluctuation correlation function. Common wave spectra include PM spectrum, JONSWAP spectrum and Apel spectrum. In this paper, the most concise PM spectrum in mathematics is used to simulate the sea surface.

[0212] The PM spectrum is a gravitational wave spectrum in which the long and short gravitational waves play a major role respectively when the wave numbers are different. It is obtained by fitting after sp...

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Abstract

The invention discloses a system parameter design and transmission power optimization method of a multi-mode small satellite SAR in a scan mode, and a system parameter design method, which are used to provide antenna size, signal bandwidth, pulse repetition frequency, and scan wave for system simulation in a scan mode. Number of digits, wave position and other system working parameters. The transmission power optimization method makes full use of the characteristics of strong microwave scattering on the sea surface under the condition of high wind speed and suitable wind direction to reduce the transmission power, so as to improve the start-up time of each track when the multi-mode small satellite SAR works in SAR mode. The design results of system parameters in scan mode, the simulation results of ocean scene under conventional power, and the simulation results of ocean scene after power optimization are given. The results show that when the designed system parameters are used for system simulation, better ocean scene imaging results are obtained. The simulation results also verify that when the sea surface wind speed is high and the wind direction is suitable, better ocean scene imaging results can still be obtained with the reduced transmit power.

Description

technical field [0001] The invention relates to the field of multi-mode small-satellite SAR, in particular to a method for system parameter design and transmission power optimization of the multi-mode small-satellite SAR in scanning mode. Background technique [0002] Multi-mode small satellite SAR (Synthetic Aperture Radar, Synthetic Aperture Radar) is a new radar system. It makes full use of the phased array antenna's flexible beam scanning, the characteristics of multi-beam generation and software reconfigurable technology, and integrates the functions of remote sensors such as SAR, altimeter, scatterometer, spectrometer, etc. Make the remote sensor work in different modes such as SAR, altimeter, scatterometer, and spectrometer in time-sharing. When applied to ocean scenes, the SAR mode has obvious advantages in sea target detection. The altimeter mode has high accuracy in measuring sea surface height. The scatterometer mode is good at high-precision inversion of sea sur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/40
CPCG01S7/4052G01S7/4086
Inventor 周鹏吕伟强薛莲万勇曲晓俊戴永寿孙伟峰李立刚
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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