Multi-sending-multi-receiving interference synthetic aperture radar space-time two-dimension signal waveform designing method

A technology of interferometric synthetic aperture and multiple transmission and multiple reception, which is applied in the field of space-time two-dimensional signal waveform design of multiple transmission and multiple reception interferometric synthetic aperture radar, which can solve the problems of reducing the performance of multiple transmission and multiple reception interferometric synthetic aperture radar and reducing the width of surveying and mapping bands, etc.

Active Publication Date: 2014-02-26
XIDIAN UNIV
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Problems solved by technology

Although this method can greatly reduce the mutual interference between signals, because it needs to increase the repetition frequency of the transmitted signal waveform, it will greatly reduce the width of the surveying

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  • Multi-sending-multi-receiving interference synthetic aperture radar space-time two-dimension signal waveform designing method
  • Multi-sending-multi-receiving interference synthetic aperture radar space-time two-dimension signal waveform designing method
  • Multi-sending-multi-receiving interference synthetic aperture radar space-time two-dimension signal waveform designing method

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[0031] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0032] Step 1. Calculate the Doppler center frequency required for waveform design.

[0033] 1a) Calculate any transmit-receive combination A separately i -A j The Doppler center frequency of the transmitted signal and the received signal Doppler center frequency for:

[0034] f ij Tx = 2 V sin β ij Tx / λ ,

[0035] f ij Rx = 2 V sin β ij Rx / λ ,

[0036] Wherein, i=1,2,...,M, j=1,2,...,M, M is the number of array elements, For transmit-receive combination A i -A j The launch oblique angle, For transmit-receive comb...

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Abstract

The invention discloses a multi-sending-multi-receiving interference synthetic aperture radar space-time two-dimension signal waveform designing method which mainly solves the problem that in the prior art, waveform orthogonality is poor, and sending signal pulse repetition frequency is high. The implementation steps of the method are that 1. Doppler center frequency shift delta f i j needed by waveform design is computed; 2. according to the Doppler center frequency shift delta f i j, waveform modulation oblique view angle beta i j is computed; 3. the modulation oblique view angle beta i j is subjected to non-redundancy processing through the Doppler center frequency shift consistency of the sending-receiving combination Ai-Aj and Aj-Ai; 4. according to the non-redundancy modulation oblique view angle number, the sending pulse of an array element Ai is subjected to sub-pulse dividing, modulation oblique view angles are distributed to sub pulses; and 5. the sending sub pulses of array elements are subjected to modulation respectively through the modulation oblique view angles, and a radar waveform signal si(t) is obtained. According to the method, pulse repetition frequency is effectively lowered, waveform orthogonality is improved, larger surveying and mapping band width is obtained, and the method can be used for multi-sending-multi-receiving interference synthetic aperture radar imaging.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to a method for designing space-time two-dimensional signal waveforms of multiple-transmission and multiple-reception interference synthetic aperture radar. This method can be used in the interferometric synthetic aperture radar system. By optimizing the waveform of the transmitted signal, while obtaining high waveform orthogonality, the frequency shift of the ground scattering coefficient caused by the observation is compensated by the space-time two-dimensional coding of the waveform, and the multiple The utilization rate of receiving multiple interferometric synthetic aperture radar signals and the width of the surveying and mapping band. Background technique [0002] As an important all-weather and high-resolution sensor, synthetic aperture radar has been widely used in various fields. When using synthetic aperture radar to image the ground, each scattering point on the ground wi...

Claims

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Application Information

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IPC IPC(8): G01S7/282G01S7/288G01S13/90
CPCG01S7/2813G01S7/282G01S7/42G01S13/24G01S13/9023G01S13/9058
Inventor 刘楠郭苹唐世阳张林让张娟
Owner XIDIAN UNIV
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