Design method of space-time two-dimensional signal waveform of multi-transmission multi-receiver interferometric synthetic aperture radar
A technology of interferometric synthetic aperture and multi-transmit and multi-receive, which is applied in the field of space-time two-dimensional signal waveform design of multi-transmit and multi-receive interferometric synthetic aperture radar, and can solve the problems of reducing the performance of multi-transmit and multi-receive interferometric synthetic aperture radar, and reducing the width of the swath.
Active Publication Date: 2015-09-30
XIDIAN UNIV
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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 band to meet the Doppler ambiguity and distance requirements. There is no requirement for fuzziness, so it greatly reduces the performance of multi-transmission and multi-reception interferometric synthetic aperture radar
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[0031] Reference 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 Doppler center frequency of the transmitted signal And 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] Among them, i=1, 2,...,M, j=1, 2,...,M, M is the number of array elements, For transmit-receive combination A i -A j Angle of launch, For transmit-receive combination A i -A j The receiving oblique angle of view, V is the speed of the radar platform, and λ is the signal wavelength;
[0037] 1b) According to the calculated Doppler center frequency of the transmitted signal and the received signal in 1a), the transmit-receive combination A is obtained i -A j The Doppler c...
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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 field of radar technology, and in particular to a method for designing a space-time two-dimensional signal waveform of a multi-transmit and multi-receive interferometric synthetic aperture radar. This method can be used in interferometric synthetic aperture radar systems. By optimizing the transmitted signal waveform, while obtaining higher waveform orthogonality, the space-time two-dimensional coding of the waveform compensates for the frequency shift of the ground scattering coefficient caused by the observation, and improves the The utilization rate of receiving and sending interferometric synthetic aperture radar signals and the width of the surveying strip. Background technique [0002] As an important all-weather, high-resolution sensor, synthetic aperture radar has been widely used in various fields. When using synthetic aperture radar to image the ground, the scattering points on the ground will be projected onto the tw...
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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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