Method for determining co-seismic displacement by using single GNSS receiver

Abstract

The invention discloses a method for determining co-seismic displacement by using a single GNSS receiver. The method comprises: a precision satellite orbit and satellite clock correction information are received and stored; cycle slip detection is carried out on high-frequency carrier phase observation data received by a GNSS monitoring station; a general distance error equation of an undifferenced carrier phase is constructed and various errors are corrected; and then on the conditions that an accurate coordinate of an observation station before an earthquake is used as a known condition, the fuzziness of the carrier phase during the earthquake is supposed not to change, and the flow layer delay change is ignored, instantaneous surface displacement of the observation station within the earthquake is calculated by using a dual-frequency ionosphere-free combination observation value and a precise ephemeris, so that co-seismic displacement is obtained. According to the method, the characteristics that the precise observation station coordinate before the earthquake is known and the earthquake lasting time is not long are utilized fully; a fuzziness solution problem does not need to be considered during the specific execution process; the long-time initialization process in precise single-point positioning is avoided; and the overall calculation module becomes simple; and the method is suitable for a real-time earthquake monitoring field.

Description

technical field [0001] The invention belongs to the field of satellite navigation and positioning technology and application, in particular to a method for determining the coseismic displacement of a measuring station quickly and with high precision by using a single GNSS receiver. Background technique [0002] Earthquake is one of the most common natural disasters on the earth. The strong ground motion caused by the extremely destructive earthquake and its secondary disasters have caused huge disasters to human beings—a large number of casualties and economic losses. These painful prices always remind people to strengthen the monitoring and research of earthquakes, and improve the ability of rapid emergency response to earthquakes. [0003] To correctly understand and study earthquakes must rely on reliable seismic observation data, especially the surface displacement during near-field earthquakes, that is, coseismic displacement. Among conventional seismic observation ins...

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Problems solved by technology

However, when a strong earthquake occurs, the reference station at a closer distance will also be affected and displaced, which makes it impossible to accurately obtain the real surface displacement of the monitoring station

Another method is to use precise point positioning technology (PPP technology), which does not require a reference station, but is affected by factors such as pseudo-range noise, atmospheric delay error, unmodeled error, and satellite loss of lock. Positioning, the initialization time and reinitialization time of PPP are very long (about 20-30 minutes), resulting in a greatly reduced accuracy and efficiency, which is difficult to meet the needs of earthquake monitoring

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