source:Industry News release time:2022-07-28 Hits: Popular:realtime gps tracker online
????
????The essence of satellite-to-satellite tracking (SST) technology is to measure the distance change between two satellites with high resolution. The former category is high-orbit satellites (such as geostationary satellites, GPS satellites, etc.) tracking low-orbit (LEO) satellites or space vehicles, and the latter category is between 2 satellites in roughly the same low-orbit (LEO) orbit. Tracking, the distance between two satellites can be hundreds of kilometers. Both types of SST technologies use LEO satellites as sensors of the earth's gravity field, and use a one-way or two-way microwave ranging system between satellites to measure the relative speed and variation between satellites. Rate. The information reflected by this irregular speed change contains the information of the earth's gravitational field. The lower the satellite orbit is, the more obvious the influence of this velocity change is by the gravitational field, and the higher the resolution of the reflected gravitational field.
????Among these two types of SST technologies, the information obtained by high and low satellite tracking is relatively rich, because:
????High-orbit satellites, especially multiple high-orbit satellites (such as GPS), can obtain the information transmitted by low-orbit satellites in most orbits; (2) The medium-wave, long-wave, and short-wave information of the ground gravity field can be recovered; (3) Unlike low-orbit satellites, high-orbit satellites are less affected by the gravitational field, so the change in velocity between satellites can better reflect the information of the gravitational field, and the orbits of high-orbit satellites are easier to accurately determine.
????The first test of SST technology was carried out in 1975. The high-orbit satellite is the geostationary satellite (GEO) ETS-6, and the low-orbit satellite is NIMBUS-6 and APOLLO-SYYUS. The accuracy was too low (less than 10渭m/s), and no satisfactory results were obtained, so NASA abandoned this research; until 1991, the experiment was carried out again using GPS satellites as high-orbit satellites, and LANDSAT was used as low-orbit satellites. , install a GPS receiver on the satellite plane to conduct orbit determination and test the distance between high and low satellites and their variability. The resolution and accuracy are not high, and there are no satisfactory results; the CHAMP, GRACE and GOCE 3 satellites launched by the European Space Agency (ESA) under the auspices of Germany (GFZ) will be dedicated in the next 10 years. Experimentation of SST and Satellite Gravitational Gradient Measurement (SGG) to improve the understanding of Earth's gravitational field.
????IGS sees continued support for low-orbiting satellites (LEO) as an important aspect of its mission and has established a dedicated LEO working group. The LEO working group formulated a work plan and made some recommendations: ?? Establish a corresponding standardized ground station network for tracking LEO by IGS to meet the requirements of LEO; ? IGS transmits data from these ground station networks at a rate shorter than 24 hours 3) Establish a corresponding GPS data exchange format for the GPS 1 Hz sampling rate data of the ground station network; 4) Understand the role and significance of investigating IGS precision orbits for GPS data collection on the LEO platform.
Read recommendations:
TK100B- Accurate Pro version GT06/TK100
Last article锛?GPS early warning
Next article锛?GPS application in ionospheric monitoring
Related Information
Gps speed limiter Production
2023-04-23Best hidden gps trackers
2023-03-16Car gps tracking wholesale
2023-04-23fleet gps trackers custom
2023-04-23gps tracker no monthly fee
2023-03-16Magnetic gps tracker sales
2023-04-23GPS Tracker for vehicles Manufacturing
2023-03-16OBD GPS Tracker custom
2023-04-11Magnetic gps tracker wholesaler
2023-03-16fleet gps trackers Processing
2023-04-23GF70L-Solar Magnetic Asset GPS Tracker
2023-10-07GF30 Magnet GPS tracker with Voice listen
2022-06-21G07L 4G GPS Tracker
2022-09-06C32 (9~90V E-bikes/Motorcycle/Car gps tracker)
2022-06-21TK08AL- RFID Car GPS Tracker
2023-10-07Instructions for the operation of the built -in receiver of the car positioning terminal
2023-04-03GPS predecessor
2023-06-01How to choose a reliable GPS manufacturer service operator to cooperate with?
2022-07-16How to judge the impact of GPS positioner on battery life.real-time gps tracking Manufacturing
2023-04-06The current status and development trend of China's car navigation industry.gps tracker for trailer
2023-05-17How to judge the quality of a car GPS locator?vehicle gps tracker webfleet solutions
2023-03-21What is GPS location time?
2022-10-26How is GPS positioned?
2023-02-21GPS maintenance.cat gps tracker manufacture
2023-08-12How long can the historical trajectory records of the car GPS positioning system be maintained.Car g
2023-09-20GPS coordinate
2022-11-23The selection and installation of the car GPS positioning terminal.realtime gps tracker online manuf
2023-03-28GPS Navigation
2022-08-12Composition of GPS system
2022-08-12Car positioning tracker.mileage tracking webfleet solutions
2023-02-24