Broadband receiving digital waveform formation method based on dechirp processing and two-time time delays

A wideband reception and digital beam technology, applied in the field of broadband reception digital beamforming, can solve the problem of wideband signal side frequency phase error, digital delay line delay resolution can not meet the phase accuracy requirements, deterioration of wideband digital beam side lobe performance, etc. question

Active Publication Date: 2016-01-13
HOHAI UNIV
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Problems solved by technology

[0009] a. The delay resolution of the digital delay line cannot meet the phase accuracy requirements of digital beam steering, and digital delay and phase compensation need to be ...

Method used

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  • Broadband receiving digital waveform formation method based on dechirp processing and two-time time delays
  • Broadband receiving digital waveform formation method based on dechirp processing and two-time time delays
  • Broadband receiving digital waveform formation method based on dechirp processing and two-time time delays

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Embodiment Construction

[0076] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0077] A broadband receiving digital beamforming method based on deskewing processing and two delays proposed by the present invention, the specific implementation steps are as follows figure 1 shown.

[0078] Step 1, design DDS, produce broadband linear frequency modulation (LFM) signal, specifically:

[0079] (1a) The digital baseband signal of the broadband LFM signal is divided into two phases, that is, a 0-phase signal and a 1-phase signal.

[0080] 0-phase signal:

[0081]

[0082] 1 phase signal:

[0083]

[0084] In the formula, m represents the number of sampling points of 0-phase signal and 1-phase signal; π represents the radian corresponding to the semicircle; is the FM slope of the wideband LFM signal, B is the bandwidth of the wideband LFM signal, and T is the pulse width of the wideband LFM signal; T s is the sampling int...

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Abstract

The invention discloses a broadband receiving digital waveform formation method based on dechirp processing and two-time time delays. A DDS is designed by use of a polyphase processing technology in an FPGA, by use of two double-accumulators and a CORDIC algorithm, digital band-based signals of broadband chirp signals are generated, and then interpolation filtering upconversion digital-to-analog conversion is carried out; a digital time delay filer is designed; by use of externally input reference clock signals and frequency agility local oscillator signals, first and second local oscillator signals are generated; an antenna array receives radar echo signals and performs frequency mixing filtering with the first local oscillator signals and the second local oscillator signals through amplitude-limiting amplification; and synthesizing is carried out after digital time delay processing on the signals in a frequency domain so as to form a receiving digital wave beam. According to the invention, by use of phase control and continuously variable digital time delay control, broadband dechirp local oscillator signals are generated, and receiving waveform formation control of broadband signals is realized.

Description

technical field [0001] The invention relates to a broadband receiving digital beamforming method based on de-skew processing and two time delays, and belongs to the technical field of array signal processing. Background technique [0002] Phased array radar can complete various tasks such as target search, tracking, and guidance, so it is widely used in fields such as multi-target ballistic measurement, air defense warning, and multi-target tracking and guided weapon systems. Requirements such as large airspace, multiple targets, and anti-jamming urge radar to develop in a digital direction. Digital array radar is the direction of future phased array radar technology development. The requirements for imaging and identifying targets have prompted radars to use wideband and high-resolution signal waveforms. For digital arrays of broadband signals, due to the existence of aperture transit time, only phase control cannot effectively form beams and control beam pointing. In ord...

Claims

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Application Information

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IPC IPC(8): G01S7/32
CPCG01S7/32
Inventor 蒋德富付伟苏宇钱荣魏爽沈明威
Owner HOHAI UNIV
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