Signal processing system and method based on estimating signal direction of anived wave
A signal processing and signal direction technology, applied in the field of satellite communication, can solve the problems of increasing the number of weighted phase shifters and delayers, unable to meet the requirements of satellite communication, and not suitable for satellite communication applications, so as to improve the accuracy and reduce the number of , the effect of reducing the width of the main lobe
Inactive Publication Date: 2008-03-05
PEKING UNIV
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Its disadvantage is that when the number of antenna array elements is relatively large, the number of weighted phase shifters and delayers also increases, and the calculation amount required to calculate the complex-valued amplitude and phase weighting coefficients increases rapidly, which is not conducive to real-time data processing
Neither of these two systems can meet the requirements of satellite communication and are not suitable for application in satellite communication
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[0039] The array antenna (1) in the signal processing system involved in the present invention receives signals sent from one or more far-field devices (for example, satellite ground stations, base stations, etc.); the control part (4) controls the switching matrix (2) nodes On-off state; the signal receiver (3) receives the arrival wave signal output by the switching matrix (2), and becomes a digital baseband signal after processing; the covariance calculation part (5) calculates the estimated value of the arrival wave signal correlation matrix; the subarray The synthesis part (6) synthesizes the equivalent main array covariance matrix based on the estimation of the subarray output covariance matrix, and the result is stored in the data memory (7); the spatial feature detection part (8) estimates the Darbolet wave based on the estimation of the covariance matrix angle to achieve super-resolution Direction of Arrival (DOA) estimation. The specific implementation method is as f...
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The system includes following parts: array antenna part, antenna array element for inductive receiving signal of remote arrived wave; switching matrix part, connecting or disconnecting node according to instruction of control circuit; signal receiver part, magnifying or attenuating amplitude of signal output from antenna array, carrying out AGC process, carrying out demodulating and decoding so as to convert signal of arrived wave to digital baseband signal; control part, controlling connection and disconnection of switching matrix, controlling operation for accessing data memory; covariance count part for calculating covariance of signal output from array element; subarray composition part (adder), composing equivalent covariance; data memory part, storing intermediate result of data operation and final result; space feature detection part, detecting space feature parameters of signal of arrived wave in order to realize estimating direction of arrived wave.
Description
technical field [0001] The invention relates to the field of satellite communication, in particular to a processing device and method for DOA estimation of signals in satellite communication. The method can be applied to occasions where the number of processors is less than the number of antenna elements due to system complexity and power consumption limitations. Background technique [0002] In spectral estimation, typical spectral estimation methods can be divided into three types: the periodogram method (periodogram) proposed by Schuster in 1898, which is a direct spectral estimation method based on Fourier transform; the AR, MA and ARMA model proposed by Yule in 1927 The model parameter power spectrum estimation method; the super-resolution spectrum estimation method proposed by Schmidt in 1986, the MUSIC method is a typical representative and one of the most widely used methods. The MUSIC super-resolution spectrum estimation method is based on the subspace decomposition...
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IPC IPC(8): H04B7/04G01S1/02H01Q21/00G01S3/14
Inventor 项海格尚勇许文龙蒋伟
Owner PEKING UNIV