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Phase difference estimation method of distributed radar based on orthogonal waveforms

A quadrature waveform and phase difference technology, applied in the field of distributed fully coherent radar, can solve the problem of phase asynchrony of the local oscillator system, and achieve the effect of improving the estimation accuracy

Inactive Publication Date: 2014-08-20
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 Patents(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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