三频信标高精度TEC测量新方法

电子总含量(TEC)是电离层探测的主要参量之一, 作为层析(CT)的输入参量, TEC测量精度直接影响电离层CT成像的结果. 过去主要采用双频信标测量TEC, 由于相位积分常数的求解、系统硬件延迟等误差, 使得TEC测量结果不能满足电离层CT高精度重建成像的要求. 三频相干信标技术的出现, 使得电离层天基测量技术有了新的发展. 提出了基于三频信标的传播时延-相位联合测量反演TEC的方法, 融合三频信标在电子密度随机起伏探测和相位积分常数计算两方面的优势, 进一步提高了TEC的测量精度. 模拟结果显示利用此方法的三频信标TEC测量结果提高了电离层CT的精度. 

New Hybrid Method for High Resolution TEC Measurement With the Tri-band Beacon

The ionospheric Total Electron Content (TEC) is one of the key parameters of ionospheric sounding results. As the main input parameter, the measurement precision of TEC will directly affect the Computer ionospheric Tomography (CT) imaging result. In the past, the dual-band technique was mainly used for TEC measurement. However, due to the solution of the phase integral constant and error of the system hardware delay, the TEC results cannot satisfy the high accuracy requirement of reconstruction imaging by using the ionospheric CT. The newly developed tri-band technique throws new light on the space-based ionospheric sounding techniques. A new method is proposed for inversing TEC on the basis of combining the propagation delay and phase with the tri-band beacon. By using the fusion of advantages of both detecting random electron density fluctuations and computing phase integral constants with the tri-band beacon, it further improves the measuring resolution of the ionospheric TEC. Simulation results show that the CT resolution is improved by using the three-frequency measurement based on this method.