Multi-Static Interferometer Using Pseudo Orthogonal Codes
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Solution Overview
Problem
Current radar systems face performance degradation when detecting and tracking multiple objects due to resource overload, multipath interference, and difficulty in accurate angular position determination, which existing techniques fail to address effectively in a balanced manner.
Innovation Solution
A multi-mode, multi-static interferometer system using spatially distributed transmitters and receivers that generate and process uniquely coded signals, enabling improved detection and tracking capabilities by distinguishing between signals and mitigating multipath interference through independent, non-coherent, and coherent processing modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radar resources are replicated to detect and track multiple objects, then detection and tracking capability improves, but system complexity and resource overhead increase
Solution Approach 1:
The patent combines multiple radar functions (detection, tracking, angular position determination) into a unified multi-static interferometer system that processes signals from multiple transmitters and receivers simultaneously. The system merges mono-static and multi-static radar operations, allowing shared signal processing resources while maintaining capability for multiple objects.
Solution Approach 2:
The interferometer system performs multiple functions simultaneously: it detects objects, tracks their motion, determines angular positions with high precision, and mitigates multipath interference. The same receiver array and signal processing infrastructure support all these functions, eliminating the need for separate dedicated systems.
2Measurement precision
If sophisticated signal processing is used to overcome multipath interference, then detection accuracy improves, but processing complexity increases
Solution Approach 1:
The system converts multipath interference, traditionally a harmful factor, into useful information. By receiving signals through multiple spatially distributed receivers, the system obtains multiple copies of the same reflected signal traveling different paths. The signal processing exploits these multiple paths to determine angular positions and mitigate interference effects, transforming what was previously a degradation into a measurement advantage.
Solution Approach 2:
The patent introduces pseudo-orthogonal codes as intermediaries to distinguish direct path signals from multipath signals. These coded waveforms allow the receiver to identify and separate different signal paths through correlation processing, enabling the system to selectively use direct path signals for accurate target detection while filtering out multipath contributions.
3Measurement precision
If multiple transmitters and receivers are used to improve angular position accuracy, then measurement precision improves, but signal separation becomes difficult
Solution Approach 1:
The system changes the temporal parameter of the transmitted signals by using pseudo-orthogonal codes with distinct code sequences for each transmitter. This coding allows the receiver to separate signals from different transmitters through correlation processing, even when they arrive simultaneously. The orthogonality property of the codes ensures that each transmitter's signal can be independently identified and processed.
Solution Approach 2:
The patent employs periodic modulation of the transmitted signals using coded waveforms. Each transmitter emits signals with unique periodic code patterns, allowing the receiver to distinguish between transmitters through synchronized detection. The periodic structure enables coherent integration and improves signal-to-noise ratio while maintaining signal separability.
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 system enhances detection and tracking of multiple targets, improves angular position accuracy, and extends range by employing pseudo orthogonal codes, allowing for precise positioning and operation in challenging environments.
Implementation Method 1
a return signal from transmissions provided by the transmitter array and reflecting off an object
Implementation Method 2
distinguishing, based on the uniquely coded signals, a first signal transmitted by the first transmitter from a second signal transmitted by the second transmitter in response to reception of a combined signal including reflected signals
Data Source
AI summary
A system for providing a multi-mode, multi-static interferometer may include a transmitter array, a receiver array and a processor. The transmitter array includes at least a first transmitter and a second transmitter spatially separated from each other by a first known distance. The receiver array includes at least a first receiver and a second receiver spatially separated from each other by a second known distance. The receiver array is positioned to enable receipt of a return signal from transmissions provided by the transmitter array and reflecting off an object. The processor is configured to enable the transmitter array to generate uniquely coded signals and configured to distinguish, based on the uniquely coded signals, a first signal transmitted by the first transmitter from a second signal transmitted by the second transmitter in response to reception of a combined signal including reflected signals corresponding to at least the first and second signals by the receiver array.