Wide band orthogonal linear frequency modulation wave light generating system and method

A chirp wave and chirp technology, applied in the field of broadband orthogonal chirp light generation system, can solve problems such as research is still blank, achieve high encoding rate, enhance the ability of target detection and recognition, and improve the distance resolution Effect

Active Publication Date: 2018-11-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the research in the field of broadband quadrature chirp light generation is still blank

Method used

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  • Wide band orthogonal linear frequency modulation wave light generating system and method
  • Wide band orthogonal linear frequency modulation wave light generating system and method
  • Wide band orthogonal linear frequency modulation wave light generating system and method

Examples

Experimental program
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Embodiment

[0085] In this embodiment, taking two-channel (n=2) quadrature phase-coded chirp light generation as an example, an experimental test is carried out on the broadband quadrature chirp light generation system and method. The start frequency of the target phase-coded chirp is 11.5GHz, the pulse width is 8us, the stop frequency is 8.5GHz, the repetition period is 10us, and the encoding rate is 0.5Gb / s; the start frequency of the light-borne chirp generated by 4bit microwave photon DAC (PDAC) 11.5GHz, pulse width 8us, stop frequency 8.5GHz, repetition period 10us. The generated light-carrying chirp wave is divided into two paths by an optical coupler with a splitting ratio of 50:50, and sent to two dual-output modulators respectively. The bias voltage of the dual-output modulators is set to half of the half-wave voltage. The coding sequence (the total length is 4095) is generated from the M sequence with the number of 12, and the first 4000 codes are taken as the first coding seque...

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Abstract

The invention provides a wide band orthogonal linear frequency modulation wave light generating system and method and belongs to the orthogonal waveform generation field. The system comprises an optical-borne linear frequency modulation wave generator, an optical coupler, a code sequence generator and a DC power supply and further comprises several phase encoding units, or several equivalent phasemodulation units or several upconverted phase encoding units, wherein an output end of the optical-borne linear frequency modulation wave generator is connected with an input end of the optical coupler, and output ends of the optical coupler, the code sequence generator and the DC power supply are respectively connected with an input end of the corresponding unit. The system is advantaged in thatorthogonal phase coding linear frequency modulation waves with the wide band and high orthogonality can be generated, the system is applied to the field of an MIMO radar, the range resolution and work performance of the MIMO radar can be effectively improved, and target detection and identification capability is enhanced.

Description

technical field [0001] The invention belongs to the field of orthogonal waveform generation, and in particular relates to a broadband orthogonal linear frequency modulation wave optical generation system and method. Background technique [0002] Orthogonal waveforms play an important role in multiple-input multiple-output (MIMO) radars. MIMO radars have multiple transmitting antennas, which transmit mutually orthogonal radar waveforms to irradiate targets at the same time, and multiple receiving antennas receive target echo signals and respond to them The wave is processed to extract information such as the spatial position and motion state of the target. Due to the good pulse compression performance of the chirp wave, a high distance resolution can still be obtained through pulse compression in the case of large time width, which effectively solves the contradiction between the radar action range and the distance resolution. Commonly used waveforms. Therefore, the generat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/484H04B10/548H04B10/516
CPCH04B10/516H04B10/548G01S7/484
Inventor 郑小平肖雪迪李尚远吴德鑫薛晓晓
Owner TSINGHUA UNIV
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