GEO卫星机会源近岸海面高度测量性能评估
Performance Assessment of Coastal Sea Surface Height Measurement Using Opportunity-Source Signal from GEO Satellite
王峰 1杨东凯2
作者信息
- 1. 地理信息工程国家重点实验室,陕西西安 710054;北京航空航天大学电子信息工程学院,北京 100191
- 2. 北京航空航天大学电子信息工程学院,北京 100191
- 折叠
摘要
基于同步地球轨道(Geostationary Earth Orbit,GEO)卫星的机会源技术已被证明其在近岸海面高度测量中的应用潜力,但目前研究主要围绕可行性论证展开,极少开展全方位的测量性能评估.为此,从仿真和试验两个角度评估了信号带宽、非相干累加次数、信噪比及波形峰值跟踪算法对GEO卫星机会源海面测高性能的影响.评估结果表明当非相干累加次数和信噪比大于最优非相干累加次数和最优信噪比时,测高性能将不再显著提升.因此,通过选择最优非相干累加次数,以及设计合理的接收天线增益、射频增益及接收机带宽使信噪比大于最优信噪比对GEO卫星机会源海面测高至关重要.通过对比插值和拟合两种波形跟踪算法发现拟合法能提供比插值法更高的测量精度.利用北斗B3I信号和ASTRA 19.2 E卫星信号开展GEO卫星海面测高的试验评估.试验结果表明:在非相干累加次数大于10 000、信噪比大于7 dB时,北斗B3I信号和ASTRA 19.2 E卫星信号可分别提供精度约为0.20 m和0.10 m的海面高度.针对GEO卫星多频或多通道传输特点,提出了基于信号频谱合成提高海面测高精度的方法.当利用中卫1号卫星10个通道信号进行合成时,插值法和拟合法的仿真测距精度分别为3.50 cm和0.69 cm.
Abstract
It is potential to measure sea surface height using opportunity of source from geostationary earth orbit(GEO)satellites.Most studies focus on the experimental demonstrations,but few works comprehensively assess its perfor-mance.Based on this,the paper evaluates the influence of the signal bandwidth,incoherent integration number,signal-to-noise ratio(SNR)and retracking algorithm on the oceanic altimetry performance.It is found that once the incoherent inte-gration number and SNR are over the optimal incoherent integration number and SNR,the improvements of the altimetry performances are insignificant.Therefore,choosing optical incoherent average number,and designing the receiver antenna gain,radio-frequency gain,and receiver bandwidth to obtain optical SNR are needed.The fitting method can provide a bet-ter precision than the interpolation method.The data from the BeiDou B3I signal and ASTRA 19.2 E satellite experiments are used to assess the GEO opportunity-source altimetry.The experiment results show that for the incoherent average num-ber and SNR over 10 000 and 7 dB,respectively,the altimetry precision of about 0.20 m and 0.10 m can be obtained,re-spectively.Due to multi-frequency or multi-channel transmission,the spectral synthesis is proposed to improve the altime-try precision.The simulation results show that the synthetized signal from 10-channel signals of Zhongwei-1 satellite pro-vides a precision of 3.50 cm and 0.69 cm for the interpolation and fitting method.
关键词
地球同步轨道卫星/机会源遥感/海面高度/信号带宽/信噪比/非相干累加Key words
GEO satellite/opportunity-source remote sensing/sea surface height/signal bandwidth/signal-to-noise ratio(SNR)/incoherent integration引用本文复制引用
基金项目
地理信息工程国家重点实验室项目(SKLGIE2020-Z-1-1)
中国博士后科学基金(2021M700319)
出版年
2024
国家科技期刊平台
NSTL
万方数据