Tracking Receiver Signal Leakage Correction
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Solution Overview
Problem
In tracking receivers, poor isolation between sum and difference signals leads to leakage, causing steady errors in orientation direction error calculations, which deteriorate tracking accuracy.
Innovation Solution
A tracking receiver is designed with a complex sum signal generator, complex difference signal generator, correction coefficient storage, and correcting circuitry to estimate and correct for signal leakage, ensuring accurate orientation direction error calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If isolation between sum signal and difference signal is improved, then tracking accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction coefficients that compensate for sum signal leakage into the difference signal. Instead of physically isolating the signals through complex hardware design, the system performs correction in advance through digital signal processing, thereby improving tracking accuracy without significantly increasing device complexity
Solution Approach 2:
The patent replaces mechanical/isolation-based solutions with digital signal processing. Rather than using complex physical isolation mechanisms between sum and difference signal paths, the invention uses mathematical correction methods (complex number operations, phase rotation, amplitude adjustment) to eliminate leakage effects, thus improving accuracy while keeping device complexity manageable
2Device complexity
If hardware design is simplified, then device complexity is reduced, but signal leakage occurs causing steady errors
Solution Approach 1:
The patent introduces an intermediary correction mechanism between the difference signal and the final orientation direction error calculation. The correction coefficients act as intermediaries that compensate for the leakage effect, allowing simple hardware design while maintaining high measurement precision through the intermediary correction layer
Solution Approach 2:
The patent substitutes complex hardware isolation mechanisms with digital signal processing operations. By using complex number mathematics, phase rotation, and amplitude adjustment in the signal processing domain, the system achieves high precision orientation direction error measurement without requiring complex hardware isolation design
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
This solution effectively reduces the deterioration of tracking accuracy by correcting for signal leakage, improving the antenna's ability to track the radio wave direction.
Implementation Method 1
a complex sum signal generator to generate a complex sum signal by performing quadrature detection to a sum signal outputted from an antenna to receive a radio wave from a radio wave source
Data Source
AI summary
A tracking receiver includes: a complex sum signal generator to generate a complex sum signal; a complex difference signal generator to generate a complex difference signal; a first correction coefficient storage to store a first correction coefficient represented by a complex number; complex difference signal correcting circuitry to calculate a corrected complex difference signal by correcting the complex difference signal based on the complex sum signal and the first correction coefficient; and an orientation direction error calculator to calculate an orientation direction error based on the corrected complex difference signal and the complex sum signal, the orientation direction error being a difference between an arrival direction and an orientation direction, the arrival direction being a direction from which the radio wave comes and arrives, the orientation direction being a direction in which the antenna is orientated.