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This paper shows the demonstration results of the software Doppler tracking of Chinese Chang'E-3 power descent flight. Frequency variation history has been recovered over almost the entire the power flight, using both the carriers and DOR tones received by the Jiamusi and New Norcia big antennas. The results seem to be consist with the predicted value computed from the designed descending trajectory,...
Same-beam interferometry (SBI) is a kind of interferometric tracking technique. It involves the simultaneous coherent tracking of two or more deep space probes, separated by a small line-of-sight angle, by a single ground antenna. Due to its inherent high precision characteristics, the differential carrier phase delay measurements acquired in SBI contain a wealth information of the relative distance...
In Chinese Chang'E-3 mission, the lander finally succeeded landing on the lunar surface softly and released the moon rover. The power descent phase, which posed a great challenge to the newly developed receiver in the deep space station, also turns out to be the most challenging part in the whole mission as there would be no Doppler data to reconstruct the trajectory if the receiver had lost the lock...
Under the condition of lunar orbit rendezvous and docking, the effect of error on the accuracy of real-time correct solution in the process of the real-time resolving cycle ambiguity of same beam interferometry is studied. First, the basic principles of resolving differential cycle ambiguity and differential phase delay of SBI is introduced. Combined with the experience of Japanese SELENE mission...
This article describes a new frequency synthesis approach to realize extremely accurate relative position determination for two spacecrafts with phase measurements at a variety of frequency separations. Both of the spacecrafts transmit one carrier wave phase modulated by two DOR sine tones at X-band, and one wave at S-band. These frequencies are set to resolve the cycle ambiguity of carrier wave at...
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