Doppler characterization for leo satellites

1. How do satellites use Doppler effect?
2. What are the features of LEO in satellite communication?
3. How do you track a LEO satellite?
4. What frequency do LEO satellites use?

How do satellites use Doppler effect?

As the satellite passes overhead, the range between the receiver and the satellite changes; that steady change is reflected in a smooth and continuous movement of the phase of the signal coming into the receiver. GPS uses the Doppler shift as an observable. It has broad applications in signal processing.

What are the features of LEO in satellite communication?

LEO satellites have a circular (or elliptical) orbit at a height of 250–2000 km from the Earth surface (Figure 14.3). The orbit period, mainly depending on the altitude, varies in the range 90–120 min.

How do you track a LEO satellite?

Tracking LEO Satellites

Using a technique known as 3D TDOA, their locations can be pinpointed in three dimensions. The significant advantage of using RF geolocation is that it only detects objects that are emitting RF radiation, allowing satellites to be picked out from the non-RF-emitting majority of space junk.

What frequency do LEO satellites use?

The station utilizes the VHF (145 MHz) for uplink and the UHF (435 MHz) for the downlink.