利用历元间差分观测值进行参考站周跳探测与修复

载波观测量是高精度卫星导航定位及其相关应用的基础,其整周模糊度的正确解算是实现厘米级导航定位和纳米级授时的关键。周跳探测与修复直接影响整周模糊度解算的性能,尤其对于连续运行参考站网等高精度位置服务的核心基础设施,保证连续可靠的模糊度解算是实现高精度位置服务的重要保障。参考站接收机具有观测值精度高、静止等特点,且采样频率较高(一般为1 Hz),在较短的时间间隔内,电离层延迟、对流层延迟、硬件延迟等误差相关性较强。基于以上特点,本文将历元间差分法应用于参考站周跳探测与修复,结合参考站静止的特性,提出了一种适用于参考站的周跳探测与修复的方法。该方法无需进行观测值组合,同时避免了伪距噪声的影响,探测精度高,且单站各个频率可以单独探测,在周跳修复的过程中,考虑非整周粗差并进行剔除。试验表明,该方法可以准确地探测和修复1周的整周周跳,可以探测小数偏差大于0.1周的非整周粗差。

Detection and repair of reference station cycle slip using differential observations among epochs

Carrier phase observables is the basis of high-precision satellite navigation and positioning and its related applications. The correct resolution of the integer ambiguity is the key to achieve centimeter-level navigation, positioning and nano-level timing. Cycle slip detection and repair will directly affect the performance of integer ambiguity resolution, especially for the core infrastructure of high-precision location service such as CORS (continuous operation of reference station) networks. Ensuring continuous and reliable ambiguity resolution is important to achieve high-precision location service. The reference station receiver has the characteristics of high accuracy, static, and a high sampling frequency (generally 1 Hz), et al. In a short time interval, the errors of ionospheric delay, tropospheric delay, and hardware delay have a strong correlation. Based on the above characteristics, this paper applies the inter-epoch difference method to the reference station cycle slip detection and repair. Refer to the characteristics of the reference station stationary, a cycle slip detection and repair method suitable for the reference station is proposed. This method does not require multi-frequency combination of observations while avoids the influence of pseudorange noise. It has high detection accuracy, and can detect each frequency of a single station separately. In the process of cycle slip repair, It considers the non-integer gross error and removes it. Experiments show that this method can accurately detect and repair the whole week cycle slip of 1 week, and can detect the non-integer gross error with decimal deviation more than 0.1 week.