Top ionosphere detection space-borne MIMO radar system

A technology of radar system and ionosphere, which is applied in the direction of radio wave measurement system, measurement device, radio wave reflection/reradiation, etc. It can solve the problems of low azimuth resolution, long frequency scanning period, and no resolution ability, etc., and achieve high The effect of azimuth resolution and high work efficiency

Inactive Publication Date: 2012-09-05
BEIHANG UNIV
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Problems solved by technology

However, their working mode is still the traditional sweeping working mode
The scanning period of this scanning mode is relatively long, resulting in almost no ability to resolve the electron density in the azimuth direction (along the flight direction of the satellite). For example, the scanning period of TOPADS is 10 seconds, and its azimuth resolution is as low as 75 kilometers

Method used

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  • Top ionosphere detection space-borne MIMO radar system
  • Top ionosphere detection space-borne MIMO radar system
  • Top ionosphere detection space-borne MIMO radar system

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Embodiment

[0047] According to the parameters shown in Table 1, the system was simulated by computer. In the simulation, the sub-pulse code of the complete complementary sequence is selected from {1, -1, j, -j}, where j 2 = -1.

[0048] Table 1 Simulation parameters

[0049]

[0050] In the simulation, the ionospheric electron density distribution N e (h, x) is approximately regarded as the product of the vertical distribution part and the horizontal disturbance part, assuming the vertical distribution N ver (h) Satisfy the Chapman model, the horizontal disturbance part F hor (x) is the Gaussian function:

[0051] N e (h, x)=N ver (h)·F hor (x) (5)

[0052] N ver ( h ) = N 0 exp { 0.5 [ 1 - h - h 0 H - exp ( - h - h 0 H ) ] } - - - ( 6 )

[0053] F hor ( x ) = 1 + exp [ - ( x - μ ) 2 σ 2 ] - - - ( 7 )

[0054] In the formula...

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Abstract

The invention discloses a top ionosphere detection space-borne MIMO radar system which belongs to the field of radar technology and compromises a complete complementary sequence generator, a pulse period delayer, a modulator, emission antennae, reception antennae, a demodulator, a pulse compression system and an electron density distribution generation system. The complete complementary sequence generator simultaneously generates N pairs of complementary sequences. The pulse period delayer alternatively inputs two complementary sequences to the modulator. N pairs of signals are modulated at Ncarrier frequencies respectively and sent out by the N emission antennae, and the echo signals are received by the N reception antennae. The demodulator demodulates signals on the N carrier frequencies. The signals are sent to the electron density distribution generation system after pulse compression to generate a two dimensional ionogram. The space-borne MIMO radar system is used for the top ionosphere detection. Compared with the prior ionosphere detector, the space-borne MIMO radar system of the invention can generate two dimensional ionograms and has very high orientation resolution and high work efficiency.

Description

Technical field [0001] The invention relates to a satellite-borne MIMO (Multiple-Input Multiple-Output) radar system for detecting the top ionosphere, belonging to the technical field of radars. Background technique [0002] The ionosphere is one of the important components of the earth's space environment, and its height extends from 60 kilometers to 1,000 kilometers above the ground. The ionosphere will cause serious interference to the propagation of electromagnetic waves, and have a great impact on space information systems such as satellite communications, navigation and positioning, and microwave remote sensing. Therefore, detecting the structure of the ionosphere is beneficial to improve the information acquisition and application of the above-mentioned space information systems. quality. In addition, by detecting changes in ionospheric physical parameters (electron density, etc.), it is possible to provide early warning of natural disasters such as earthquakes and tsunam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/02G01S13/89G01S7/28
Inventor 陈杰李卓李春升周健
Owner BEIHANG UNIV
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