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The experimental satellite of BD navigation system has assembled inter-satellite link (ISL) payloads and has obtained the real ISL observation data. The paper presents the preprocessing method of ISL and the POD method and result for Ka only observation and the combination Ka observation with L-band. It's showed that:the radial orbit error is less than 0.5 m with Ka only observation; the radial orbit error is less than 0.3 m with the observation by combining the Ka ISL with L-band data which has improved the orbit accuracy remarkably in contrast to L-band only data; the accuracy of calibrating device delay is better than 0.1 m。

To investigate the effect of ultrasound-guided percutaneous injection of cinobufotalin or anhydrous ethanol in the treatment of portal vein tumor thrombus (PVTT) through a comparative analysis. MethodsA total of 56 patients with PVTT after liver cancer surgery, who were admitted to the 94th Hospital of PLA from October 2009 to December 2011, were enrolled. Among these patients, 27 underwent ultrasound-guided percutaneous injection of cinobufotalin (cinobufotalin group) and 29 underwent ultrasound-guided percutaneous injection of anhydrous ethanol (anhydrous ethanol group). The clinical outcome and survival time were compared between the two groups after treatment, and the levels of total bilirubin (TBil), alanine aminotransferase (ALT), and aspartate aminotransferase (AST) before and after treatment were compared. The t-test was used for comparison of continuous data between groups, the chi-square test was used for comparison of categorical data between groups, the rank sum test was used for comparison of ranked data, and the Kaplan-Meier method was used for survival analysis. ResultsThe response rate showed no significant difference between the cinobufotalin group and the anhydrous ethanol group (63.0% vs 58.6%, χ2=0.111, P＞0.05). After treatment, the cinobufotalin group had significantly lower levels of TBil, ALT, and AST than the anhydrous ethanol group (t=2.24, 2.40, and 2.39, all P＜0.05). The 6-month, 1-year, and 2-year survival rates showed no significant differences between the cinobufotalin group and the anhydrous ethanol group (81.5%/63.0%/29.6% vs 82.8%/586%/31.0%, χ2=0.016, 0.111, and 0.013, all P＞0.05). ConclusionUltrasound-guided percutaneous injection of cinobufagin or anhydrous ethanol has similar short- and long-term effects in the treatment of PVTT and can inhibit the growth of tumor thrombus and prolong survival time, but cinobufagin is superior to anhydrous ethanol in the aspect of protecting liver function.

Airborne vector geomagnetic measurement can not only obtain total geomagnetic field strength of geomagnetic field, but also detect the vector information of geomagnetic field, so it is an effective technology to obtain the geomagnetic field information of land and offing area in high precision and resolution quickly. Therefore, this technology has broad application prospect in the domain of aviation, sailing, and spaceflight, especially in the application of self-navigation of geomagnetic matching. The first airborne vector geomagnetic measurement was successfully developed by Xi’an research institute of surveying and mapping and national space science center of Chinese academy of sciences in China. During May-June in 2015, and June-July in 2016, the integration experimentation of the airborne vector geomagnetic measurement was organized by Xi’an Research Institute of Surveying and Mapping on the plain of Inner Mongolia, it included 227 flying surveying lines, and of which the length was about 5000 kilometers, so a great amount of total geomagnetic field strength and vector information of geomagnetic field were obtained. Based on 15 repeated flying surveying lines, 400 crossing points of 20 intersection flying surveying lines in the direction of south-north, east-west, which are in 200m and 700m flying height, the precision evaluation of the airborne vector geomagnetic measurement is accomplished by the comparison of repeated flying surveying lines and crossing points. From the comparison of repeated flying surveying lines, we can get the conclusion that the precision of total geomagnetic field strength on the flying surveying lines in 200m and 700m flying height are 2nT and 1nT, respectively. The precision of three components of the geomagnetic field are between 5nT and 10nT. And from the comparison of crossing points, we can get the conclusion that the precision of total geomagnetic field strength on the flying surveying lines are 1nT, the precision of three components of the geomagnetic field are below 10nT. Therefore, from the data processing of the first airborne vector geomagnetic measurement in China, we can see that the precision of total geomagnetic field strength is about 2nT, and the precision of three components of the geomagnetic field are about 10nT.

ObjectiveTo evaluate the clinical value of ultrasound-guided percutaneous cinobufagin injection for the treatment of portal vein tumor thrombus (PVTT) in primary liver cancer (PLC) patients. MethodsA total of 25 PLC patients with PVTT who were admitted to our hospital from January 2009 to March 2012 were recruited in this study. These patients underwent ultrasound-guided percutaneous cinobufagin injection three times a week, and each course of treatment was 4-5 weeks. After treatment, the clinical efficacy and survival rates were determined, and the changes in levels of alpha fetoprotein (AFP) and alanine aminotransferase (ALT) were evaluated. Results Seventeen patients showed varying degrees of improvement after treatment, with an overall response rate of 68%. In addition, the levels of AFP and ALT were significantly reduced after treatment (P＜0.05). The survival rates at 3, 6, 12, and 24 months after treatment were 88%, 76%, 60%, and 32%, respectively. ConclusionUltrasound-guided percutaneous cinobufagin injection has good efficacy in the treatment of PVTT in PLC patients and shows a good clinical value.