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US 12,223,582 B2Granted
Iterative ray-tracing for autoscaling of oblique ionograms
AssigneeAtmospheric & Space Technology Research Associates LLC
InventorsGeoffrey Crowley, Timothy M. Duly, Clive Winkler, Syed Irfan Azeem
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Abstract
This invention relates generally to ionogram image processing, autoscaling and inversion systems and methods for ionospheric monitoring, modeling, and estimation of the same. One advantage of the present invention is to provide a system, e.g., a lightweight, low-power, and fully-autonomous ionospheric monitoring system that is able to provide fully processed and highly accurate ionosphere characterization in near real-time over a low data-rate satellite link.
Claims4
A method of iterative ray tracing, comprising the steps of:
- transmitting, from a transmitter at a first location, a swept signal into a portion of the ionosphere;
- receiving, at a receiver positioned at a second location, a reflection of the swept signal;
- at a computing system connected to the receiver:
- receiving a first input comprising data indicative of an oblique incidence (OI) ionogram based on the reflection of the swept signal;
- reducing at least one of noise and other spurious signals in the data to programmatically produce a first output comprising first output data;
- autoscaling the first output data to programmatically produce a second output comprising data indicative of a substantially separated O-trace and an X-trace;
- iteratively processing the second output to programmatically predict the electron density profile over a measurement region associated with the portion of the ionosphere, wherein iteratively processing the second output comprises:
- determining a vertical incidence (VI) ionogram based on the second output;
- determining an initial electron density profile based on the VI ionogram;
- determining a constructed OI ionogram based on the initial electron density profile;
- determining that a difference between the constructed ionogram and second output exceeds a threshold;
- and
- adjusting one or more parameters of the initial electron density profile based on the difference between the constructed ionogram and second output;
- and
- outputting a predicted electron density profile.
12 more elements
A system for iterative ray tracing, the system comprising:
- a transmitter positioned at a first location and configured to transmit a swept signal into a portion of the ionosphere;
- a receiver positioned at a second location and configured to receive the swept signal from the transmitter;
- a computing system connected to the receiver, the computing system comprising one or more processors and a memory storing instructions, which when executed by the one or more processors, cause the computing system to:
- receive a first input comprising data indicative of an OI ionogram;
- reduce at least one of noise and other spurious signals in the data to programmatically produce a first output comprising first output data;
- autoscale the first output data with an autoscaling and extraction module to programmatically produce a second output comprising data indicative of a substantially separated O-trace and an X-trace;
- and
- iteratively process the second output to programmatically predict the electron density profile over a measurement region associated with the portion of the ionosphere, wherein iteratively processing the second output comprises:
- determining a vertical incidence (VI) ionogram based on the second output;
- determining an initial electron density profile based on the VI ionogram;
- determining a constructed OI ionogram based on the initial electron density profile;
- determining that a difference between the constructed ionogram and second output exceeds a threshold;
- and
- adjusting one or more parameters of the initial electron density profile based on the difference between the constructed ionogram and second output;
- and
- output a predicted electron density profile.
13 more elements
Dependencies are inferred from the claim text.