Hyperbolic Waveform MIMO Radar Analog Mixing
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Solution Overview
Problem
Existing multiple-input multiple-output (MIMO) radar implementations, such as TDMA and CDMA schemes, are inefficient in terms of transmission power and complex, often requiring high-speed digital-to-analog converters and complex local oscillators, lacking a coding family with optimal cross-correlation properties for radar operations.
Innovation Solution
A hyperbolic waveform MIMO radar system that generates orthogonal waveforms using analog circuitry, combining linear and hyperbolic frequency modulated signals without digital-to-analog converters, enabling efficient code-division multiple-access (CDMA) operations with low cross-correlation and high autocorrelation properties, suitable for range determination and Doppler shift analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If TDMA-MIMO radar implementations are used, then the system structure is simpler, but transmission power efficiency and maximum unambiguous Doppler are reduced
Solution Approach 1:
The patent implements continuous transmission of orthogonal waveforms from multiple transmit antennas simultaneously, eliminating the time-division gaps in TDMA. This continuous operation maintains constant transmission power efficiency while the orthogonal waveform design ensures simple system structure without requiring complex switching mechanisms.
2Productivity
If CDMA-MIMO radar schemes are used, then transmission power efficiency and maximum unambiguous Doppler are improved, but device complexity and hardware requirements increase
Solution Approach 1:
The patent changes the waveform parameter from traditional linear frequency modulation to hyperbolic frequency modulation. This parameter change enables the generation of orthogonal waveforms with superior cross-correlation properties that maintain low hardware complexity. The hyperbolic modulation allows simultaneous transmission of multiple orthogonal waveforms without requiring complex digital-to-analog converters or sophisticated local oscillator schemes.
Solution Approach 2:
The patent combines linear frequency modulated signals with hyperbolic frequency modulated signals to create composite orthogonal waveforms. This composite approach leverages the advantages of both modulation types to achieve low cross-correlation between different transmit antennas while maintaining simple hardware implementation through analog mixing circuits.
3Productivity
If traditional CDMA-MIMO radar implementations are used, then better transmission efficiency is achieved, but the system requires high-speed digital-to-analog converters and complex local oscillators
Solution Approach 1:
The patent extracts and eliminates the need for high-speed digital-to-analog converters from the system architecture. By implementing hyperbolic frequency modulation through analog circuits, the invention removes this complex and expensive component while maintaining transmission efficiency. The analog implementation of waveform generation simplifies the overall hardware architecture.
Solution Approach 2:
The patent replaces complex electronic systems (high-speed digital-to-analog converters and complex local oscillators) with simpler analog circuitry. The hyperbolic frequency modulation can be implemented using basic analog components such as voltage-controlled oscillators and analog multipliers, substituting the need for sophisticated digital conversion systems.
4Measurement precision
If orthogonal waveforms with low cross-correlation are used, then range detection and Doppler accuracy are improved, but waveform generation complexity increases
Solution Approach 1:
The patent changes the fundamental parameter of waveform modulation from linear to hyperbolic frequency modulation. This parameter change inherently produces waveforms with excellent orthogonal properties and low cross-correlation, improving range and Doppler measurement precision without increasing generation complexity. The hyperbolic modulation function can be implemented using standard analog circuits.
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 achieves efficient MIMO radar operations with reduced hardware complexity, enhanced range detection, and improved unambiguous Doppler and direction of arrival accuracy, eliminating the need for high-speed digital converters and complex local oscillators.
Implementation Method 1
The plurality of transmit circuits are coupled to the generator circuit and are operable to generate a plurality of transmit signals by analog mixing the linear frequency modulated signal and the hyperbolic frequency modulated signal
Implementation Method 2
The multiple-input multiple-output antenna is coupled to the plurality of transmit circuits and is operable to transmit the plurality of transmit signals toward an object and receive a plurality of receive signals from the object
Implementation Method 3
The plurality of receive circuits are coupled to the multiple-input multiple-output antenna and are operable to determine a plurality of data signals in response to the plurality of receive signals, wherein the plurality of data signals are suitable to determine a distance between the multiple-input multiple-output antenna and the object
Data Source
AI summary
A hyperbolic waveform multiple-input multiple-output radar includes a generator circuit, multiple transmit circuits, a multiple-input multiple-output antenna, and multiple receive circuits. The generator circuit may be operable to generate a linear frequency modulated signal and a hyperbolic frequency modulated signal. The transmit circuits may be operable to generate multiple transmit signals by analog mixing the linear frequency modulated signal and the hyperbolic frequency modulated signal in response to a plurality of coding family parameters, wherein the transmit signals define an orthogonal family of waveforms. The multiple-input multiple-output antenna may be operable to transmit the transmit signals toward an object and receive multiple receive signals from the object. The receive circuits may be operable to determine multiple data signals in response to the receive signals, wherein the data signals are suitable to determine a distance between the multiple-input multiple-output antenna and the object.