VSAT Cable Loss Measurement and Power Adjustment

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Solution Overview

Problem

Conventional satellite terminal installation methods rely on trial and error to set the power output of indoor units (IDUs) to avoid saturation at the block upconverter (BUC) of outdoor units (ODUs), due to inaccurate estimation of cable loss between IDUs and ODUs, which is time-consuming and inefficient.

Innovation Solution

A power detector system that measures and extrapolates cable loss across multiple frequencies using a microcontroller with an analog-to-digital converter, allowing for accurate adjustment of IDU output power to prevent BUC saturation, integrated into an antenna pointing tool.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If trial and error method is used to set IDU power output, then installation can be completed, but installation time is excessive and efficiency is low

Engineering Contradiction:

Improveinstallation efficiencyVSAvoidinstallation time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The system measures cable loss across multiple frequencies (parameter variation) and uses this data to determine optimal IDU power output settings. By changing the measurement parameters from single-frequency to multi-frequency analysis, the system accurately identifies the power level that prevents BUC saturation, eliminating trial-and-error installation procedures and significantly improving installation efficiency.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If conventional cable loss estimation is used, then setup is simpler, but power output accuracy is insufficient leading to BUC saturation

Engineering Contradiction:

Improvecable loss measurement accuracyVSAvoidmeasurement system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The power detector is integrated into the antenna pointing tool, making the device multi-functional. The same device performs both antenna pointing and cable loss measurement functions. This universal approach increases measurement precision for cable loss while avoiding the complexity of separate specialized equipment, as the detector leverages existing RF signal paths and processing capabilities.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system uses the existing RF signal path from IDU through the cable to ODU for self-measurement. The power detector at the ODU measures the actual signal level received, and this information is fed back to determine IDU power settings. The system serves itself by using its own operational signals for measurement, eliminating the need for external test equipment and reducing overall system complexity.

Inventive Principle:

Principle #25Self-service

3Measurement precision

If multi-frequency measurement is implemented, then cable loss accuracy improves, but measurement complexity increases

Engineering Contradiction:

Improvecable loss measurement accuracyVSAvoidmeasurement process complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The system implements feedback by measuring cable loss at multiple frequencies and using this information to adjust IDU power output settings. The power detector measures signal levels across the frequency spectrum, feeds this data back to the control system, which then determines the optimal power level to prevent BUC saturation. This closed-loop feedback approach improves measurement accuracy while managing complexity through automated processing.

Inventive Principle:

Principle #23Feedback

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables precise and efficient measurement of cable loss, allowing IDUs to set optimal power levels to avoid BUC saturation, reducing installation time and improving signal quality without the need for expensive power meters or specialized equipment.

Implementation Method 1

a filter for substantially isolating radio frequency (RF) signals transmitted at each of a plurality of frequencies

Methodology Applied

Scientific EffectFrequency filtering: Filter (electronic)

Implementation Method 2

an RF detector configured to detect the RF signals

Methodology Applied

Scientific EffectRF signal detection:

Implementation Method 3

a microcontroller comprising an analog to digital converter (ADC) component configured to convert the detected RF signals into voltage data

Methodology Applied

Scientific EffectAnalog to digital conversion:

Data Source

PatentUS9985721B2Method and system for automatically calculating cable attenuation between a satellite terminal and a radio across a frequency spectrum

Publication Date: 2018.05.29 HUGHES NETWORK SYST

AI summary

A very small aperture terminal (VSAT) installation tool is provided having the ability to measure cable loss along an interfacility link (IFL) between an outdoor unit and an indoor unit of the VSAT. Radio frequency (RF) signals can be transmitted from the indoor unit to the outdoor unit, where the RF signals are intercepted along the IFL prior to reaching the outdoor unit, and the output power is determined. The determined output power is compared to an expected output power at the indoor unit. The delta between the determined output power and the expected output power can be used to adjust the power of the indoor unit such that the outdoor unit can operate without reaching its compression point. The determined output power can be extrapolated based upon measured of the output power performed over a range of frequencies at which the indoor unit operates.