Performances Analysis of Coherently Integrated CPF for LFM Signal Under Low SNR and Its Application to Ground Moving Target Imaging

Liu, Dong; Zhan, Muyang; Su, Jia; Liu, Hongqing; Zhang, Xuepan; Liao, Guisheng

doi:10.1109/tgrs.2017.2727508

Cited by 37 publications

(22 citation statements)

References 36 publications

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“…As shown by Li, et al [20], when the SNR is high, the CRLB for frequency and frequency rate estimation without outlier are as shown in Equations (57) and (58):…”

Section: Tracking Threshold Evaluationmentioning

confidence: 96%

“…As the coherent integration time increases from 0.01 to 0.1 s, the energy loss due to the 500 Hz/s residual Doppler rate increases from 0.0005 dB to about 6 dB, which is very significant. So, we take Equation (20) as the criteria to determine the FFT resolution.…”

Section: Performance Analysis and Processing Parameter Influence Evalmentioning

confidence: 99%

“…As an illustration, Figure 9 is a performance comparison of two integration approaches: the blue dotted line is 0.01 s of coherent integration with 50 blocks of incoherent summation, which corresponds to a total 0.5 s integration, while the red solid line is 0.25 s of coherent integration only. It could be seen that the 0.25-s integration has a better detection performance, although the first approach has an integration time of 0.5 s. According to Equation (20), the main limitation of expanding the coherent integration is the existence of the large Doppler rate. Short coherent integration (corresponding to small FFT resolution, ∆F) also leads to the inaccurate estimation of Doppler frequency, which in turn limits the carrier detection performance.…”

Section: Performance Analysis and Processing Parameter Influence Evalmentioning

confidence: 99%

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Direct Instantaneous Frequency Rate Estimation to Improve the Carrier Estimation Performance in Mars Entry, Descent, and Landing Flight

et al. 2018

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This paper focuses on the carrier estimation performance improvement in Mars entry, descent, and landing (EDL) flights. Carrier reconstruction could be used for trajectory derivation and Martian atmosphere profile inversion, and is the critical information for mission operations, as it helps determine the flight status of the spacecraft, demodulate the downlink information. The current approach is maximum likelihood estimation based on a two-dimensional (2D) maximum energy search algorithm, which computes the grid energy over all the combinations of frequency cells and frequency rate cells among the search space. Although it has good performance on robust estimation, the frequency estimation accuracy is limited due to the short coherent integration. An instantaneous frequency rate tracking approach based on the cubic phase function (CPF) is proposed that directly estimates the instantaneous frequency rate over the frequency rate cells, followed by the frequency estimation among the frequency cells. A sequential estimation method is introduced to propose the sequential CPF statistics, which uses the a priori Doppler phase information to suppress the noise squaring loss inherent in the standard CPF statistics. Simulations have been made on the released Mars Science Laboratory EDL trajectory for the two approaches, which show that considerable estimation improvement has been achieved for aerobraking flight by the new algorithm.

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“…As shown by Li, et al [20], when the SNR is high, the CRLB for frequency and frequency rate estimation without outlier are as shown in Equations (57) and (58):…”

Section: Tracking Threshold Evaluationmentioning

confidence: 96%

Section: Performance Analysis and Processing Parameter Influence Evalmentioning

confidence: 99%

Section: Performance Analysis and Processing Parameter Influence Evalmentioning

confidence: 99%

See 1 more Smart Citation

Direct Instantaneous Frequency Rate Estimation to Improve the Carrier Estimation Performance in Mars Entry, Descent, and Landing Flight

et al. 2018

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“…However, these two methods only use partial autoterm energy, and both are noncoherent integrations. In view of the shortcomings of the above two algorithms, we propose to utilize the coherently integrated CPF (CICPF) transform [42] by further exploiting the amplitude and phase information of the signal. With the CICPF, Equation 19is…”

Section: Motion Parameter Estimation Using Cicpfmentioning

confidence: 99%

An Efficient Ground Manoeuvring Target Refocusing Method Based on Principal Component Analysis and Motion Parameter Estimation

Liu

et al. 2020

Remote Sensing

Self Cite

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Refocusing ground manoeuvring targets with complex motions in synthetic aperture radar (SAR) remains a challenging objective because of the large range of cell migration (RCM) and time-varying Doppler frequency modulation (DFM). By exploiting the geometric information of RCM and two-dimensional (2-D) coherently integrated gain, a fast ground manoeuvring target refocusing method using principal component analysis (PCA) and high-order motion parameter estimation is proposed. First, an efficient phase difference (PD) method and PCA are utilized to correct the RCM, and then, the energy of the ground manoeuvring target is concentrated into the same range bin. Second, by utilizing the coherently integrated cubic phase function (CICPF) that was developed in our previous work, the motion parameters are obtained accurately, and the manoeuvring target is thus well refocused into a sharp peak point based on the estimated motion parameters. The proposed method is of low computational complexity because it avoids time-consuming search and interpolation operations and demonstrates an improved anti-noise performance due to fully exploiting the 2-D coherent accumulation characteristics for estimating motion parameters and enhanced refocused imaging results for manoeuvring targets due to adopting the high-order motion model. Finally, experiments are conducted using simulated and real SAR data to show the performance of the proposed method.

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“…In, [17] a diversity coming from successive pulses is used to detect range-spread targets. In [18], [19], [20], a timedivision multiplexing of the antennas is exploited to create a diversity for Ground Moving Targets Identification (GMTI). An extension to non Gaussian model has been explored in [21], [22], [23].…”

Section: B Relation To Prior Workmentioning

confidence: 99%

Design of New Wavelet Packets Adapted to High-Resolution SAR Images With an Application to Target Detection

Mian

Ovarlez

Atto

et al. 2019

IEEE Trans. Geosci. Remote Sensing

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High-Resolution in synthetic aperture radar (SAR) leads to new physical characterizations of scatterers which are anisotropic and dispersive. These behaviors present an interesting source of diversity for target detection schemes. Unfortunately, such characteristics have been integrated and have been naturally lost in monovariate single look SAR images. Modeling this behavior as non-stationarity, wavelet analysis has been successful in retrieving this information. However, the sharp-edge of the used wavelet functions introduces undesired high side-lobes for the strong scatterers present in the images. In this paper, a new family of parametrized wavelets, designed specifically to reduce those side-lobes in the SAR image decomposition, is proposed. Target detection schemes are then explored using this spectroangular diversity and it can be shown that in High-Resolution SAR images, the non-Gaussian and robust framework leads to better results.

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Performances Analysis of Coherently Integrated CPF for LFM Signal Under Low SNR and Its Application to Ground Moving Target Imaging

Cited by 37 publications

References 36 publications

Direct Instantaneous Frequency Rate Estimation to Improve the Carrier Estimation Performance in Mars Entry, Descent, and Landing Flight

Direct Instantaneous Frequency Rate Estimation to Improve the Carrier Estimation Performance in Mars Entry, Descent, and Landing Flight

An Efficient Ground Manoeuvring Target Refocusing Method Based on Principal Component Analysis and Motion Parameter Estimation

Design of New Wavelet Packets Adapted to High-Resolution SAR Images With an Application to Target Detection

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