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Phase difference estimation method of distributed radar based on orthogonal waveforms

A technology of orthogonal waveform and phase difference, which is applied in the field of distributed fully coherent radar, can solve the problems of out-of-synchronization of the phase of the local oscillator system, and achieve the effect of improving the estimation accuracy

Inactive Publication Date: 2013-02-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

Moreover, in the distributed system, since each unit radar is equipped with its own independent local oscillator system, there will be a problem of phase asynchrony between the local oscillator systems.

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  • Phase difference estimation method of distributed radar based on orthogonal waveforms
  • Phase difference estimation method of distributed radar based on orthogonal waveforms
  • Phase difference estimation method of distributed radar based on orthogonal waveforms

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[0093] The distance R between the target and the radar 1 1 =200km, distance R between target and radar 2 2 =200.025km; the phase synchronization error of the two radars Δθ=10°. The center frequency f of the radar transmitted signal 0 =10GHz; radar transmission pulse repetition period PRT=2ms, pulse width τ=0.2ms; optional phase code space M=4 of quadrature polyphase coded signal; sub-pulse number N=200 of quadrature polyphase coded signal; The peak value of the cross-correlation function will seriously affect the measurement accuracy of the phase difference, so the weighting coefficient of the cost function λ=100 is selected; the noise is additive Gaussian white noise, and the signal-to-noise ratio SNR=30dB.

[0094] Therefore, the time delay difference of the two echo signals Δt=ΔR / c=0.1667us; and the quadrature signal sub-pulse width τ sub =τ / N=1us. Therefore, the echo time difference between the two radars does not exceed one sub-pulse. Therefore, the following cost fu...

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Abstract

The invention relates to a phase difference estimation method of a distributed radar based on orthogonal waveforms, and the phase difference estimation method solves a phase difference estimation problem in a new system radar specific to a distributed full-coherent radar. The phase difference estimation method comprises: step one, using an amendment cost function to design the orthogonal waveforms: firstly, determining the amendment cost function according to targets provided by a search radar and apriori information of a distance difference of two radars, then using a hybrid optimization algorithm of a simulated annealing algorithm and a traditional iterative algorithm to search a phase space to enable the cost function to be minimum, and accordingly obtaining phase matrixes of sub pulses; and step two, sending the orthogonal waveforms and estimating a phase difference: firstly, using the orthogonal waveforms designed in the step one to conduct up-conversion to obtain transmitting signals of the two radars, enabling target echoes received from the two radars to be separated into four channels of echo signals through a matched filter group after the transmitting signals are reflected by a target, then conducting phase extraction on the four channels of echo signals to estimate the phase difference, and finally conducting average weighting on two estimated values to obtain a final phase difference estimated value.

Description

technical field [0001] The invention belongs to the technical field of distributed full coherent radar, and relates to a phase difference estimation method of distributed radar based on orthogonal waveforms. Background technique [0002] The measurement accuracy and sensitivity of the radar are related to the receiving signal-to-noise ratio. When the power of the radar transmitter is constant, it is necessary to increase the radar aperture to increase the radar gain and improve the output signal-to-noise ratio. The demand for high-precision and high-sensitivity detection of long-distance targets has promoted the development of large-caliber radars, such as the GBR-P radar (antenna diameter of about 12.5 meters) and SBX radar (antenna diameter of about 22.1 meters) in the United States. However, a radar with such a large caliber will inevitably make it difficult to maneuver and deploy, and it will be expensive to manufacture. In order to overcome the inherent shortcomings of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
Inventor 杨小鹏曾涛殷丕磊龙腾
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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