摘要 :
For realizing the rapid estimation of time delay, Doppler shift and Doppler rate of moving targets in passive radar, we present a cross ambiguity function algorithm based on higher order ambiguity function (CAF-HAF). In this algor...
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For realizing the rapid estimation of time delay, Doppler shift and Doppler rate of moving targets in passive radar, we present a cross ambiguity function algorithm based on higher order ambiguity function (CAF-HAF). In this algorithm, higher order ambiguity function transforms the nonlinear harmonious signal's estimation to the linear harmonious signal's estimation, then zoom-FFT is used for estimating the frequency portion which the authors are interested about. Therefore, the CAF-HAF algorithm realizes the accurate estimation of the time delay, Doppler shift and Doppler rate of moving target with less computational cost. Then the computation cost and the accuracy of the CAF-HAF algorithm are compared with the cross ambiguity function method based on the fractional Fourier transform (CAF-FRFT), showing higher efficiency and being more adaptive for real time signal processing.
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摘要 :
For realizing the rapid estimation of time delay, Doppler shift and Doppler rate of moving targets in passive radar, we present a cross ambiguity function algorithm based on higher order ambiguity function (CAF-HAF). In this algor...
展开
For realizing the rapid estimation of time delay, Doppler shift and Doppler rate of moving targets in passive radar, we present a cross ambiguity function algorithm based on higher order ambiguity function (CAF-HAF). In this algorithm, higher order ambiguity function transforms the nonlinear harmonious signal's estimation to the linear harmonious signal's estimation, then zoom-FFT is used for estimating the frequency portion which the authors are interested about. Therefore, the CAF-HAF algorithm realizes the accurate estimation of the time delay, Doppler shift and Doppler rate of moving target with less computational cost. Then the computation cost and the accuracy of the CAF-HAF algorithm are compared with the cross ambiguity function method based on the fractional Fourier transform (CAF-FRFT), showing higher efficiency and being more adaptive for real time signal processing.
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摘要 :
Automotive radar is stepping up Direction of Arrival (DOA) estimation performance by increasing the number of transmitters per radar. To use more transmitters, while maintaining target coherence in a Multiple Input Multiple Output...
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Automotive radar is stepping up Direction of Arrival (DOA) estimation performance by increasing the number of transmitters per radar. To use more transmitters, while maintaining target coherence in a Multiple Input Multiple Output (MIMO) radar, new waveforms are needed beyond time division techniques. In this work a novel Doppler division based MIMO technique is presented. With this technique transmitted signals are orthogonalized with frequency offsets in the Doppler dimension. A spectral gap is created in the Doppler spectrum which allows detection of velocity ambiguity thus extending the maximum unambiguous velocity and correcting cyclic rotation of the transmitter ordering. A special, novel, version of the technique, using quadrature encoding, is presented which allows the simultaneous use of three transmitters using only binary phase shifters while maintaining the Doppler spectral gap.
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摘要 :
In consideration of the measurement error and the blind region, a novel algorithm is proposed for PD radar resolving range and velocity ambiguity. The algorithm is based on minimum variance criteria, it can screen out the true val...
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In consideration of the measurement error and the blind region, a novel algorithm is proposed for PD radar resolving range and velocity ambiguity. The algorithm is based on minimum variance criteria, it can screen out the true values of Range and velocity from all possible values under the reference PRF. Compared with the traditional Chinese remainder theorem, the computational complexity of this novel algorithm is much smaller. Simulation results show that the algorithm has a good capability of tolerating measurement errors, and can correctly resolve ambiguity even if target is only visible under two PRFs.
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摘要 :
In consideration of the measurement error and the blind region, a novel algorithm is proposed for PD radar resolving range and velocity ambiguity. The algorithm is based on minimum variance criteria, it can screen out the true val...
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In consideration of the measurement error and the blind region, a novel algorithm is proposed for PD radar resolving range and velocity ambiguity. The algorithm is based on minimum variance criteria, it can screen out the true values of Range and velocity from all possible values under the reference PRF. Compared with the traditional Chinese remainder theorem, the computational complexity of this novel algorithm is much smaller. Simulation results show that the algorithm has a good capability of tolerating measurement errors, and can correctly resolve ambiguity even if target is only visible under two PRFs.
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摘要 :
In consideration of the measurement error and the blind region, a novel algorithm is proposed for PD radar resolving range and velocity ambiguity. The algorithm is based on minimum variance criteria, it can screen out the true val...
展开
In consideration of the measurement error and the blind region, a novel algorithm is proposed for PD radar resolving range and velocity ambiguity. The algorithm is based on minimum variance criteria, it can screen out the true values of Range and velocity from all possible values under the reference PRF. Compared with the traditional Chinese remainder theorem, the computational complexity of this novel algorithm is much smaller. Simulation results show that the algorithm has a good capability of tolerating measurement errors, and can correctly resolve ambiguity even if target is only visible under two PRFs.
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摘要 :
In consideration of the measurement error and the blind region, a novel algorithm is proposed for PD radar resolving range and velocity ambiguity. The algorithm is based on minimum variance criteria, it can screen out the true val...
展开
In consideration of the measurement error and the blind region, a novel algorithm is proposed for PD radar resolving range and velocity ambiguity. The algorithm is based on minimum variance criteria, it can screen out the true values of Range and velocity from all possible values under the reference PRF. Compared with the traditional Chinese remainder theorem, the computational complexity of this novel algorithm is much smaller. Simulation results show that the algorithm has a good capability of tolerating measurement errors, and can correctly resolve ambiguity even if target is only visible under two PRFs.
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摘要 :
The performance of the multi-carrier radar signal is investigated using the ambiguity function. The multi-carrier waveform under consideration is modulated by random phase coding, with the intention to combine radar and communicat...
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The performance of the multi-carrier radar signal is investigated using the ambiguity function. The multi-carrier waveform under consideration is modulated by random phase coding, with the intention to combine radar and communications and at the same time solve the Doppler ambiguity. The connection between the instantaneous power of the waveform and the Doppler sidelobes of the ambiguity function are explored. The variance of the Doppler sidelobes, which arises from the random phase coding of the carriers, is connected to the peak to average power ratio of the waveform.
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摘要 :
The performance of the multi-carrier radar signal is investigated using the ambiguity function. The multi-carrier waveform under consideration is modulated by random phase coding, with the intention to combine radar and communicat...
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The performance of the multi-carrier radar signal is investigated using the ambiguity function. The multi-carrier waveform under consideration is modulated by random phase coding, with the intention to combine radar and communications and at the same time solve the Doppler ambiguity. The connection between the instantaneous power of the waveform and the Doppler sidelobes of the ambiguity function are explored. The variance of the Doppler sidelobes, which arises from the random phase coding of the carriers, is connected to the peak to average power ratio of the waveform.
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摘要 :
The performance of the multi-carrier radar signal is investigated using the ambiguity function. The multi-carrier waveform under consideration is modulated by random phase coding, with the intention to combine radar and communicat...
展开
The performance of the multi-carrier radar signal is investigated using the ambiguity function. The multi-carrier waveform under consideration is modulated by random phase coding, with the intention to combine radar and communications and at the same time solve the Doppler ambiguity. The connection between the instantaneous power of the waveform and the Doppler sidelobes of the ambiguity function are explored. The variance of the Doppler sidelobes, which arises from the random phase coding of the carriers, is connected to the peak to average power ratio of the waveform.
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