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New method for passive radar seeker to antagonize non-coherent radar decoy 被引量:4
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作者 Weijian Si,Xicai Si,and Zhiyu Qu College of Information and Communication Engineering,Harbin Engineering University,Harbin 150001,P.R.China 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2010年第3期397-403,共7页
Using super resolution direction of arrival(DOA) estimation algorithm to reduce the resolution angle is an effective method for passive radar seeker(PRS) to antagonize non-coherent radar decoy.Considering the powe... Using super resolution direction of arrival(DOA) estimation algorithm to reduce the resolution angle is an effective method for passive radar seeker(PRS) to antagonize non-coherent radar decoy.Considering the power and correlation property between radar and non-coherent decoy,an improved subspace DOA estimation method based on traditional subspace algorithm is proposed.Because this new method uses the invariance property of noise subspace,compared with traditional MUSIC algorithm,it shows not only better resolution in condition of closely spaced sources,but also superior performance in case of different power or partially correlated sources.Using this new method,PRS can distinguish radar and non-coherent decoy with good performance.Both the simulation result and the experimental data confirm the performance of the method. 展开更多
关键词 radar countermeasures passive radar seeker(PRS) non-coherent decoy direction of arrival(DOA) estimation.
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Novel non-coherent integration method using binary phase-coded radar signal 被引量:2
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作者 田黎育 何苗 +1 位作者 刘斌 傅雄军 《Journal of Beijing Institute of Technology》 EI CAS 2013年第1期60-66,共7页
The m series with 511 bits is taken as an example being applied in non-coherent integra- tion algorithm. A method to choose the bi-phase code is presented, which is 15 kinds of codes are picked out of 511 kinds of m s... The m series with 511 bits is taken as an example being applied in non-coherent integra- tion algorithm. A method to choose the bi-phase code is presented, which is 15 kinds of codes are picked out of 511 kinds of m series to do non-coherent integration. It is indicated that the power in- creasing times of larger target sidelobe is less than the power increasing times of smaller target main- lobe because of the larger target' s pseudo-randomness. Smaller target is integrated from larger tar- get sidelobe, which strengthens the detection capability of radar for smaller targets. According to the sidelobes distributing characteristic, a method is presented in this paper to remove the estimated sidelobes mean value for signal detection after non-coherent integration. Simulation results present that the SNR of small target can be improved approximately 6. 5 dB by the proposed method. 展开更多
关键词 binary phase-coded signal non-coherent integration code agility peak sidelobe level(PSL) mainlobe-peak sidelobe ratio
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A Simple Method to Derive Minimal Cut Sets for a Non-coherent Fault Tree 被引量:2
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作者 Takehisa Kohda 《International Journal of Automation and computing》 EI 2006年第2期151-156,共6页
Minimal cut sets (or prime implicants: minimal combinations of basic event conditions leading to system failure) are important information for reliability/safety analysis and design. To obtain minimal cut sets for ... Minimal cut sets (or prime implicants: minimal combinations of basic event conditions leading to system failure) are important information for reliability/safety analysis and design. To obtain minimal cut sets for general non-coherent fault trees, including negative basic events or multi-valued basic events, a special procedure such as the consensus rule must be applied to the results obtained by logical operations for coherent fault trees, which will require more steps and time. This paper proposes a simple method for a non-coherent fault tree, whose top event is represented as an AND combination of monotonic sub-trees. A "monotonic" sub-tree means that it does not have both positive and negative representations for each basic event. It is proven that minimal cut sets can be obtained by a conventional method for coherent fault trees. An illustrative example of a simple event tree analysis shows the detail and characteristics of the proposed method. 展开更多
关键词 non-coherent fault trees monotonic sub-trees minimal cut sets.
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Non-coherent sequence detection scheme for satellite-based automatic identification system 被引量:1
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作者 Haosu Zhou Jianxin Wang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2017年第3期442-448,共7页
The satellite-based automatic identification system (AIS) receiver has to encounter the frequency offset caused by the Doppler effect and the oscillator instability. This paper proposes a non-coherent sequence detecti... The satellite-based automatic identification system (AIS) receiver has to encounter the frequency offset caused by the Doppler effect and the oscillator instability. This paper proposes a non-coherent sequence detection scheme for the satellite-based AIS signal transmitted over the white Gaussian noise channel. Based on the maximum likelihood estimation and a Viterbi decoder, the proposed scheme is capable of tolerating a frequency offset up to 5% of the symbol rate. The complexity of the proposed scheme is reduced by the state-complexity reduction, which is based on per-survivor processing. Simulation results prove that the proposed non-coherent sequence detection scheme has high robustness to frequency offset compared to the relative scheme when messages collision exists. 展开更多
关键词 non-coherent sequence detection scheme satellite based automatic identification system frequency offset messages collision Viterbi decoder
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ANALYSIS OF WEIGHTED NON-COHERENT RECEIVER FOR UWB-OOK SIGNAL IN MULTIPATH CHANNELS 被引量:1
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作者 Wu Jianjun Liang Qinglin Xiang Haige 《Journal of Electronics(China)》 2008年第1期32-38,共7页
Non-coherent receivers are attractive for pulsed Ultra-WideBand (UWB) systems due to the implementation simplicity. However, they have to face the shortage of performance degradation. Several techniques were proposed ... Non-coherent receivers are attractive for pulsed Ultra-WideBand (UWB) systems due to the implementation simplicity. However, they have to face the shortage of performance degradation. Several techniques were proposed to alleviate the noise effect and promote the receiver performance, among which is the weighted combining of multiple integration sub-intervals. In this paper, the performance of the weighted non-coherent receiver for UWB On-Off Keying (UWB-OOK) signal in multipath channels is analyzed, in terms of bit-error-rate. In addition, a closed-form expression of the approximately near-optimal weighting coefficient set is derived, and two simple weighting coefficient sets are proposed as well. Finally, the analytic results are verified via the computer simulations, which reveal obvious performance improvements to the conventional energy detector. 展开更多
关键词 Ultra-WideBand (UWB) non-coherent Energy detection Weighted processing
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PERFORMANCE OF NON-COHERENT RECEIVER WITH UWB PPM SIGNAL IN MULTIPATH CHANNELS 被引量:1
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作者 Wu Jianjun Xiang Haige 《Journal of Electronics(China)》 2007年第4期448-454,共7页
Mainly due to its implementation simplicity, the non-coherent Ultra-Wide Band (UWB) receiver is attractive for lower data rate applications, which gains much attention again in recent years. In this paper, a General L... Mainly due to its implementation simplicity, the non-coherent Ultra-Wide Band (UWB) receiver is attractive for lower data rate applications, which gains much attention again in recent years. In this paper, a General Likelihood Ratio Test (GLRT) based non-coherent receiver on UWB Pulse-Position-Modulation (PPM) signal in multipath channels is derived, and a novel structure is proposed as well. Subsequently, the closed-form expressions of asymptotic error-rate performance related to the non-coherent receiver are also derived and verified. 展开更多
关键词 Ultra-Wide Band (UWB) non-coherent General Likelihood Ratio Test (GLRT)
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A hypersonic target coherent integration detection algorithm based on Doppler feedback 被引量:6
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作者 LI Lin WANG Guohong +1 位作者 SUN Dianxing ZHANG Xiangyu 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2020年第1期85-94,共10页
The traversal search of multi-dimensional parameter during the process of hypersonic target echo signal coherent integration,leads to the problem of large amounts of calculation and poor real-time performance.In view ... The traversal search of multi-dimensional parameter during the process of hypersonic target echo signal coherent integration,leads to the problem of large amounts of calculation and poor real-time performance.In view of these problems,a modified polynomial Radon-polynomial Fourier transform(MPRPFT)hypersonic target coherent integration detection algorithm based on Doppler feedback is proposed in this paper.Firstly,the Doppler estimation value of the target is obtained by using the target point information obtained by subsequent non-coherent integration detection.Then,the feedback adjustment of the coherent integration process is performed by using the acquired target Doppler estimation value.Finally,the coherent integration is completed after adjusting the search interval of compensation.The simulation results show that the algorithm can effectively reduce the computational complexity and improve the real-time performance on the basis of the effective coherent integration of hypersonic target echo signals. 展开更多
关键词 hypersonic target coherent integration non-coherent integration Doppler estimation feedback adjustment
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Long term integration of radar signals with unknown Doppler shift for ubiquitous radar 被引量:4
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作者 Qinglong Bao Zengping Chen Yue Zhang Jian Yang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2011年第2期219-227,共9页
Ubiquitous radar is a new radar system that provides continuous and uninterrupted multifunction capability within a coverage volume. Continuous coverage from close-in "pop-up" targets in clutter to long-range target... Ubiquitous radar is a new radar system that provides continuous and uninterrupted multifunction capability within a coverage volume. Continuous coverage from close-in "pop-up" targets in clutter to long-range targets impacts selection of waveform parameters. The coherent processing interval (CPI) must be long enough to achieve a certain signal-to-noise ratio (SNR) that ensures the efficiency of detection. The condition of detection in the case of low SNR is analyzed, and three different cases that would occur during integration are discussed and a method to determine the CPI is presented. The simulation results show that targets detection with SNR as low as -26 dB in the experimental system can possibly determine the CPI. 展开更多
关键词 ubiquitous radar low signal-to-noise ratio (SNR) coherent processing interval (CPI) coherent integration non-coherent integration.
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An energy detection receiver for non-coherent IR-UWB 被引量:2
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作者 蔡力 黄鲁 +2 位作者 傅忠谦 杨静儿 王卫东 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2011年第6期96-103,共8页
A non-coherent receiver for impulse radio ultra-wide band(IR-UWB)is presented.The proposed receiver front-end consists of a high gain LNA,a high frequency detector and an intermediate frequency(IF)amplifier to amp... A non-coherent receiver for impulse radio ultra-wide band(IR-UWB)is presented.The proposed receiver front-end consists of a high gain LNA,a high frequency detector and an intermediate frequency(IF)amplifier to amplify the recovered signal and drive an external test instrument.To meet the requirements of high gain and a low noise figure(NF)under moderate power consumption for the LNA,capacitor cross coupled(CCC)and current reuse techniques were adopted.The detector consists of a squarer and an integrator.The overall circuit consumes 41.2mA current with a supply voltage of 1.8 V at a 400 MHz pulse rate.The resulting energy efficiency is 0.19 nJ/pulse.A chip prototype is implemented in 0.18-μm CMOS.The die area is 2.1×1.4 mm^2 and the active area is 1.7×0.98 mm^2. 展开更多
关键词 RECEIVER IR-UWB non-coherent LNA DETECTOR
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Weak GPS L1 Signal Acquisition Based on BPDC 被引量:3
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作者 曾庆喜 唐琳琳 +1 位作者 王庆 陈小惠 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2014年第3期331-337,共7页
It is difficult to achieve accurate acquisition of weak global positioning system( GPS) signals with traditional methods. A weak signal acquisition strategy based on block processing and differentially coherent( BPDC)... It is difficult to achieve accurate acquisition of weak global positioning system( GPS) signals with traditional methods. A weak signal acquisition strategy based on block processing and differentially coherent( BPDC) is put forward after analyzing the advantages and disadvantages of coherent and non-coherent integration algorithms. Code phase parallel search of the pre-coherent integration is conducted by using fast Fourier transform( FFT),and the results are then differential coherent processed and block processed. BPDC method reduces computation cost compared with coherent and noncoherent( CNC) algorithm. The performance of the two algorithms is also compared based on simulated signals. The result shows that the noise suppression effect of BPDC algorithms is superior to that of traditional CNC algorithm,and the superiority of BPDC is more apparent with the reduction of carrier to noise ratio( CNR). In the case that the pre-coherent integration length is 4 ms and CNR is reduced to 28 dB-Hz,CNC algorithm cannot yet acquire signal correctly while BPDC has well acquisition performance. Therefore,for weak GPS signal acquisition,BPDC algorithm can acquire the signal with lower CNR and has better acquisition property. 展开更多
关键词 block processing and differentially coherent(BPDC) coherent and non-coherent(CNC) weak GPS signals
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Target estimation using MIMO radar with multiple subcarriers 被引量:2
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作者 Min Jiang Jianguo Huang +1 位作者 Yong Jin Jing Han 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2012年第1期57-62,共6页
This paper analyzes the effect of waveform parame- ters on the joint target location and velocity estimation by a non- coherent multiple input multiple output (MIMO) radar transmitting multiple subcarriers signals. ... This paper analyzes the effect of waveform parame- ters on the joint target location and velocity estimation by a non- coherent multiple input multiple output (MIMO) radar transmitting multiple subcarriers signals. How the number of subcarriers in- fluences the estimation accuracy is illustrated by considering the joint Cramer-Rao bound and the mean square error of the maxi- mum likelihood estimate. The non-coherent MIMO radar ambiguity function with multiple subcarriers is developed and investigated by changing the number of subcarriers, the pulse width and the frequency spacing between adjacent subcarriers. The numerical results show that more subcarriers mean more accurate estimates, higher localization resolution, and larger pulse width results in a worse performance of target location estimation, while the fre- quency spacing affects target location estimation little. 展开更多
关键词 target estimation non-coherent multiple input multi- ple output (MIMO) radar multiple subcarrier waveform parameter ambiguity function (AF).
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MIMO-FSK non-coherent detection with spatial multiplexing in fast-fading environment 被引量:2
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作者 Zheng Lin Wang Zhen +2 位作者 Chen Jianmei Lin Mengying Deng Xiaofang 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 2020年第5期47-54,共8页
Accurate estimationand real-time compensation for phase offset and Doppler shift are essential for coherent multi-input multi-output(MIMO)systems.Here,a spatial multiplexing MIMO scheme with non-coherent frequency-shi... Accurate estimationand real-time compensation for phase offset and Doppler shift are essential for coherent multi-input multi-output(MIMO)systems.Here,a spatial multiplexing MIMO scheme with non-coherent frequency-shift keying(FSK)detection is proposed.It is immune to random phase interference and Doppler shift while increasing capacity.It is valuable that the proposed spatial multiplexing MIMO based on energy detection(ED)is equivalent to a linear system,and there is no mutual interference caused by the product of simultaneous signals in square-law processing.The equivalent MIMO channel model is derived as a real matrix,which remains maximal multiplexing capacity and reduces the channel estimation complexity.Simulation results show that the proposed scheme has outstanding performance over Rician flat fading channel,and experimental system obtains four times the capacity through 4 antennas on both transmitter and receiver. 展开更多
关键词 non-coherent MIMO MIMO-FSK spatial multiplexing experimental system
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A Blackman-Harris windowed triple-spectrum-line interpolation method for measuring SNR of ADCs 被引量:2
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作者 YU Zhi-guo SUN Yi-zhou +2 位作者 HUANG Pu HE Qin GU Xiao-feng 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2017年第4期321-327,共7页
In the practical measurement of signal to noise ratio(SNR)of analog-to-digital converters(ADCs)by using fast Fourier transformation(FFT)method,the non-coherent sampling is inevitable,leading to spectral leakage which ... In the practical measurement of signal to noise ratio(SNR)of analog-to-digital converters(ADCs)by using fast Fourier transformation(FFT)method,the non-coherent sampling is inevitable,leading to spectral leakage which in turn affects the calculation accuracy and final measurement results.In this paper,a new method based on the Blackman-Harris windowed triple-spectrum-line interpolation is presented for the measurement of ADCs SNR by FFT.The simulation platform is built based on MATLAB and the behavioral dynamic models of the high-speed ADC products of Analog Devices Inc.(ADI)are simulated.The simulation results show that,even in the case of the maximum non-coherent degree,the SNR error is less than0.23dB and reaches the testing standards provided by ADI,confirming that the proposed method is effective for suppressing the spectral leakage effects and improving the SNR test accuracy. 展开更多
关键词 Blackman-Harris windowed signal to noise ratio (SNR) triple-spectrum-line interpolation spectral leakage non-coherent sampling
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Constant False Alarm Rate Acquisition Algorithm for Compass B1C Signal 被引量:1
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作者 Wengang Li Tianrong Qian +1 位作者 Yiwei Wang Chen Huang 《China Communications》 SCIE CSCD 2019年第11期201-211,共11页
In order to improve the sensitivity of the Compass B1C signal acquisition for the receiver,the principle of constant false alarm rate(CFAR)is applied for the B1C pilot channel acquisition to realize the dynamic adjust... In order to improve the sensitivity of the Compass B1C signal acquisition for the receiver,the principle of constant false alarm rate(CFAR)is applied for the B1C pilot channel acquisition to realize the dynamic adjustment of the threshold of acquisition against the carrier to noise ratio.The non-coherent data/pilot combined acquisition algorithm for B1C signal is analyzed to make full use of the power of the B1C signal under the condition of low carrier to noise ratio.On this basis,to improve the acquisition sensitivity of the receiver,the principle of constant false alarm probability is applied for the non-coherent data/pilot combined acquisition algorithm.Theoretical analysis and simulations show that the non-coherent data/pilot combined acquisition algorithm with CFAR improves the B1C signal acquisition sensitivity of the receiver significantly,and achieves a better Receiver Operating Characteristic compared with the traditional acquisition algorithms. 展开更多
关键词 B1C SIGNAL non-coherent ACQUISITION ACQUISITION threshold constant false ALARM rate(CFAR)
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MICROSTRUCTURE OF DIFFERENTLY TREATED Al-Mg-Sc-Zr ALLOYS 被引量:1
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作者 Jie Zhang Zhimin Yin +2 位作者 Yonghong Zhang Yongzheng Gao Qinglin Pan 《Journal of Central South University》 SCIE EI CAS 1997年第1期24-27,共4页
The microstructures of different treated Al-5Mg-0.5Sc-0. 1Zr alloys have been studied with opticalmicroscopy and transmission electron microscope (TEM). Coherent particles with the matrix were found inas-cast sample. ... The microstructures of different treated Al-5Mg-0.5Sc-0. 1Zr alloys have been studied with opticalmicroscopy and transmission electron microscope (TEM). Coherent particles with the matrix were found inas-cast sample. composite Al3Sc/Al3Zr particles were found after 13 h homogenized treatment under 470℃.Coherent precipitates pinned dislocations and low-angle grain boundaries. and then restrained recrystallization. All kinds of particles of different treatments were not larger than 40nm. After high-temperaturestabilization treatments, most particles remain coherent with the matrix. The reasons of microstructurechange at different treated conditions have been analyzed. 展开更多
关键词 Al-Mg-Sc-Zr alloy MICROSTRUCTURE Al_3 (Sc Zr) coherent and non-coherent
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New Iterated Decoding Algorithm Based on Differential Frequency Hopping System 被引量:1
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作者 梁富林 罗伟雄 《Journal of Beijing Institute of Technology》 EI CAS 2005年第1期27-31,共5页
A new iterated decoding algorithm is proposed for differential frequency hopping (DFH) encoder concatenated with multi-frequency shift-key (MFSK) modulator. According to the character of the frequency hopping (FH) pat... A new iterated decoding algorithm is proposed for differential frequency hopping (DFH) encoder concatenated with multi-frequency shift-key (MFSK) modulator. According to the character of the frequency hopping (FH) pattern trellis produced by DFH function, maximum a posteriori (MAP) probability theory is applied to realize the iterate decoding of it. Further, the initial conditions for the new iterate algorithm based on MAP algorithm are modified for better performance. Finally, the simulation result compared with that from traditional algorithms shows good anti-interference performance. 展开更多
关键词 differential frequency hopping (DFH) maximum a posteriori (MAP) non-coherent detection
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Comparison of Kurtosis and Fourth Power Detectors with Applications to IR-UWB OOK Systems 被引量:1
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作者 Javad Taghipour Vahid Tabataba Vakili Dariush Abbasi-Moghadam 《International Journal of Communications, Network and System Sciences》 2012年第1期43-49,共7页
On-off keying (OOK) is one of the modulation schemes for non-coherent impulse radio Ultra-wideband systems. In this paper, the utilization of the kurtosis detector (KD) and fourth power detector (FD) receivers for OOK... On-off keying (OOK) is one of the modulation schemes for non-coherent impulse radio Ultra-wideband systems. In this paper, the utilization of the kurtosis detector (KD) and fourth power detector (FD) receivers for OOK signaling is introduced. We investigate the effect of integration interval and the optimum threshold on the performance of energy detector (ED), KD and FD receivers. The semi analytic expression of BER is obtained by using generalized extreme value distribution function for KD and FD receivers. From performance point of view, the simulation results show that FD receiver outperforms KD and ED receivers. In contrast, the sensitivity to the optimum threshold is greatly reduced in KD receiver compared to ED and FD receivers. 展开更多
关键词 Ultra-Wideband (UWB) non-coherent Receiver OOK Energy DETECTOR KURTOSIS DETECTOR FOURTH Power DETECTOR
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Favourable and Unfavourable EMF Frequency Patterns in Cancer:Perspectives for Improved Therapy and Prevention 被引量:3
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作者 Dirk K.F.Meijer Hans J.H.Geesink 《Journal of Cancer Therapy》 2018年第3期188-230,共43页
Carcinogenesis fits in a frequency pattern of electromagnetic field (EMF) waves, in which a gradual loss of cellular organization occurs. Such generation of cancer features can be inhibited by adequate exposure to coh... Carcinogenesis fits in a frequency pattern of electromagnetic field (EMF) waves, in which a gradual loss of cellular organization occurs. Such generation of cancer features can be inhibited by adequate exposure to coherent electromagnetic frequencies. However, cancer can also be initiated and promoted at other distinct frequencies of electromagnetic waves. Both observations were revealed by analyzing 100 different EMF frequency data reported in a meta-analyses of 123 different, earlier published, biomedical studies. The studied EM frequencies showed a fractal pattern of 12 beneficial (anti-cancer) frequencies, and 12 detrimental (cancer promoting) frequencies, that form the central pattern of a much wider self-similar EMF spectrum of cancer inhibiting or promoting activities. Inhibiting of the cancer process, and even curing of the disease, can thus be considered through exposure to the coherent type of EM fields. Stabilization of the disease can be understood by constructive resonance of macromolecules in the cancer cell with the externally appied coherent EMF field frequencies, called solitons/polarons. The latter, for instance, have been shown earlier to induce repair in DNA/RNA conformation and/or epigenetic changes. The field of EMF treatment of cancer disorders is rapidly expanding and our studies may invite further experimental and clinical studies in which systematically various potential EMF treatment protocols could be applied, with combined and modulated frequencies, to obtain even more efficient EMF anti-cancer therapies. 展开更多
关键词 Cancer Therapy Coherent EMF Frequencies non-coherent EMF Frequencies Electromagnetic Fields SOLITONS Non-Ionizing EM Radiation Frohlich Davydov
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Tracking algorithm of BPSK signal in low bit SNR and high dynamic scenarios
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作者 王鹏 陈国瑛 《Journal of Beijing Institute of Technology》 EI CAS 2015年第1期118-127,共10页
A new tracking algorithm is proposed aiming at the tracking problem in low bit signal-to- noise ratio (i. e. , Eb/N0 ) scenarios, in which the bit clock regenerated by bit synchronization loop decides loop update mo... A new tracking algorithm is proposed aiming at the tracking problem in low bit signal-to- noise ratio (i. e. , Eb/N0 ) scenarios, in which the bit clock regenerated by bit synchronization loop decides loop update moment. The double frequency processing and non-coherent accumulation tech- nologies are applied to eliminate the impact of data polarity inversion, and then long time accumula- tion improves the input signal-to-noise ratio of discriminator. The frequency locked loop and phase locked loop constitute a carrier loop in parallel, which can meet the high dynamic demands. The ef- fectiveness of this algorithm has been corroborated by theoretical analysis, simulation and measure- ments, and the new tracking algorithm has been used in an aerospace engineering project successfully. 展开更多
关键词 TRACKING double frequency processing non-coherent low bit signal-to-noise ratio
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Detection and Analysis of Strong Ionospheric Scintillation in Equatorial Region
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作者 ZHU Xuefen LIN Mengying +1 位作者 LU Zhengpeng CHEN Xiyuan 《Instrumentation》 2021年第4期1-8,共8页
To detect the occurrence of ionospheric scintillation in the equatorial region,a coherent/non-coherent integration method is adopted on the accumulation of intermediate frequency(IF)signal and local code,in the proces... To detect the occurrence of ionospheric scintillation in the equatorial region,a coherent/non-coherent integration method is adopted on the accumulation of intermediate frequency(IF)signal and local code,in the process of signal acquisition based on software receiver.The processes of polynomial fitting and sixth-order Butterworth filtering are introduced to detrend the tracking results.Combining with ionospheric scintillation detection algorithm and preset thresholds,signal acquisition and tracking,scintillation detection,positioning solution are realized under the influence of strong ionospheric scintillation.Under the condition that the preset threshold of amplitude and carrier phase scintillation indices are set to 0.5 and 0.15,and the percentage of scin-tillation occurrence is 50%,respectively,PRN 12 and 31 affected by strong amplitude scintillation are detected effectively.Results show that the positioning errors in the horizontal direction are below 5m approximately.The software receiver holds performances of accurate acquisition,tracking and positioning on the strong ionospheric scintillation conditions,which can provide important basis and helpful guidance for relevant research on ionospheric scintillation,space weather and receiver design with high performance. 展开更多
关键词 Ionospheric Scintillation Acquisition and Tracking Positioning Error Coherent/non-coherent Integration Detrending
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