Wideband Antenna System Interference Cancellation
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Solution Overview
Problem
Existing radar systems face challenges in minimizing interference from wideband jammer signals across a wide bandwidth without disrupting normal system functions or ESM operations, as current Side Lobe Cancelling systems can only achieve narrow band cancellation.
Innovation Solution
A wideband antenna system with an array of antenna elements/subarrays, utilizing transforming means to control Signal to Noise/interference Ratio (SNR) through phase shifts or time delays, optimizing array processing gain to establish cancellation directions for interfering frequencies and estimate interference source parameters by analyzing antenna patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate SLC and ESM systems are used to minimize interference and estimate parameters, then interference cancellation and parameter estimation are achieved, but antenna availability is reduced and system complexity increases
Solution Approach 1:
The patent combines the SLC interference cancellation function and the ESM parameter estimation function into a single integrated system. The same antenna aperture and signal processing resources are used for both functions simultaneously, eliminating the need for separate dedicated systems and thereby reducing overall system complexity while maintaining antenna availability.
Solution Approach 2:
The patent enables the antenna system to perform multiple functions - both interference cancellation and parameter estimation - using the same hardware resources. The signal processing architecture is designed to extract both cancellation signals and estimation data from the same received signals, making the system universal and multi-functional.
2Reliability
If narrow band SLC cancellation is used, then jammer signals are cancelled, but cancellation effectiveness is limited to only a part of the operating bandwidth
Solution Approach 1:
The patent implements a dynamic adaptive filtering approach where the cancellation filter coefficients are continuously adjusted based on the instantaneous frequency content of the received signals. This allows the narrow band cancellation capability to track and cancel jammers across the entire wide operating bandwidth by dynamically adapting the cancellation frequency to match the jammer frequency.
Solution Approach 2:
The patent changes the parameters of the cancellation filter dynamically - specifically the center frequency and bandwidth of the notch filter - to match the characteristics of the interfering jammer signals. By monitoring the spectral content and adjusting filter parameters in real-time, the system achieves effective cancellation across wide bandwidth despite using narrow band cancellation techniques.
3Measurement precision
If ESM receiver occupies antenna aperture for parameter estimation, then interference parameters are estimated, but time available for actual electronic system function is reduced
Solution Approach 1:
The patent enables continuous simultaneous operation of both the primary electronic system function and the ESM parameter estimation function. By processing signals through parallel computational paths - one for the primary function and one for ESM estimation - the system eliminates the need to switch between functions, ensuring continuous antenna availability for both purposes without time loss.
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
The solution effectively minimizes interference over a wide bandwidth without interrupting system functions, allowing for accurate estimation of interference source parameters without occupying the antenna aperture, thus enhancing the efficiency and availability of multifunctional electronic systems.
Implementation Method 1
affecting waveforms between the antenna elements and the electronic system with phase shifts or time delays obtained from an optimisation process for maximising the array processing gain
Implementation Method 2
affecting waveforms between the antenna elements and the electronic system with phase shifts or time delays obtained from an optimisation process for maximising the array processing gain
Implementation Method 3
SNR control comprises establishing of cancellation directions for interfering frequencies in the antenna pattern in the direction of interference sources
Data Source
AI summary
A method to minimize influence of interference sources by control of a signal to noise/interference ratio of a wideband antenna system connected to an electronic system. The wideband antenna system includes at least one array of at least two antenna elements/sub arrays. The signal to noise/interference ratio control includes establishing of cancellation directions for interfering frequencies in the antenna pattern in the direction of interference sources. The wideband antenna system is operational over a system bandwidth and operates with an instantaneous bandwidth. Estimation of interference source parameters is performed in an evaluation process. A wideband antenna system implementing the method.