System parameter design for multi-mode small satellite SAR in scanning mode and transmitting power optimization method

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

Active Publication Date: 2020-05-22
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,

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

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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 method for a multi-mode small satellite SAR in a scanning mode and a transmitting power optimization method. The system parameter design method is used for providing system working parameters such as the antenna size, signal bandwidth, pulse repetition frequency, scanning wave digit, wave position and the like for system simulation in the scanningmode. According to the transmitting power optimization method, the transmitting power is reduced by fully utilizing the characteristics of high wind speed and strong sea surface microwave scattering under the condition of proper wind direction, so that the starting time of each orbit when the multi-mode small satellite SAR works in an SAR mode is prolonged. A system parameter design result under the scanning mode, an ocean scene simulation result under conventional power and an ocean scene simulation result after power optimization are given. Results show that when the designed system parameters are adopted for system simulation, a good ocean scene imaging result is obtained. The simulation result also verifies that when the sea surface wind speed is high and the wind direction is proper,a good ocean scene imaging result can still be obtained by using the reduced transmitting 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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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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