Networked Radar Waveform System Decoupling Range and Velocity Ambiguities
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Solution Overview
Problem
Monostatic Doppler radar systems face limitations in maximum unambiguous range and velocity due to the fixed product of pulse repetition frequency and wavelength, leading to the range-Doppler dilemma, which restricts their ability to measure high velocities while maintaining unambiguous range measurements, especially with existing low-cost radar devices.
Innovation Solution
A networked waveform system comprising multiple radars transmitting and processing joint waveforms to decouple range and velocity ambiguities, allowing for high velocity measurements beyond the limitations of individual radars, using the principle that intrinsic environmental properties remain consistent across the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a monostatic Doppler radar transmits pulses with uniform pulse repetition frequency, then the radar can provide quantitative measures of weather phenomena, but the maximum unambiguous range and maximum unambiguous velocity are limited by the fixed product of pulse repetition frequency and wavelength
Solution Approach 1:
The patent divides a single radar system into multiple radars distributed at different geographical positions. Each radar transmits waveforms with different pulse repetition frequencies, and the network jointly processes data from all radars to resolve ambiguities that individual radars cannot resolve alone.
Solution Approach 2:
The patent adds a spatial dimension to the radar network by distributing radars at different geographical positions and orientations. This spatial distribution, combined with different pulse repetition frequencies, creates additional degrees of freedom to decouple the range-velocity trade-off that constrains single-radar systems.
2Measurement precision
If the pulse repetition frequency is increased to measure higher velocities, then the maximum unambiguous velocity increases, but the maximum unambiguous range decreases
Solution Approach 1:
The patent merges measurements from multiple radars with different pulse repetition frequencies to simultaneously achieve high velocity measurement capability and long unambiguous range. The network waveform combines waveforms from multiple radars, each with different PRFs, allowing the system to resolve both high velocities and long ranges that individual radars cannot measure alone.
Solution Approach 2:
The patent changes the pulse repetition frequency parameter across multiple radars in the network. Each radar uses a different PRF, and the network jointly processes these diverse measurements to expand the unambiguous velocity range while maintaining long unambiguous range, effectively decoupling the fixed trade-off relationship.
3Measurement precision
If multiple radars with different pulse repetition frequencies are networked together, then velocities exceeding 100 meters per second can be measured while maintaining unambiguous range, but the system complexity increases
Solution Approach 1:
The patent creates a universal network waveform that can be transmitted by multiple radars with different hardware configurations and pulse repetition frequencies. This universal waveform design allows the network to function as a unified system capable of measuring high velocities while maintaining long unambiguous range, with centralized processing that simplifies the overall system architecture.
4Ease of operation
If a single radar uses a fixed pulse repetition frequency, then the system is simple to operate, but the range-Doppler dilemma restricts measurement capabilities
Solution Approach 1:
The patent enables the radar network to self-resolve its own measurement ambiguities through joint processing of data from multiple radars with different pulse repetition frequencies. The network waveform system automatically deals with range-Doppler ambiguities through centralized processing, eliminating the need for complex manual configuration or switching while maintaining measurement accuracy.
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 networked waveform system effectively measures velocities exceeding 100 meters per second while maintaining unambiguous range, decoupling range and velocity ambiguities, and enabling direct estimation of dealiased wind fields for kinematic analysis, without requiring complex waveforms or advanced processing at each radar node.
Implementation Method 1
One of the fundamental objectives of meteorological radar systems is to sample the atmosphere surrounding the Earth to provide a quantitative measure of different weather phenomena
Implementation Method 2
a monostatic Doppler radar transmitting pulses with uniform pulse repetition frequency may face a limitation on maximum unambiguous range and maximum unambiguous velocity
Data Source
AI summary
Certain embodiments provide a network waveform system that can include multiple radars disposed at different geographical positions within an environment. The multiple radars may be configured to transmit a network waveform. The network waveform may include multiple radar waveforms. Each radar waveform of the multiple waveforms may be transmitted by a specific radar of the multiple radars. The system can also include a computer system coupled with the multiple radars that can include a processor and a memory. The memory may be configured to store information including data received from the multiple radars, data processed by the processor, and processing code executable by the processor. The processing code may include instructions to receive output data from the multiple radars resulting from the transmitted network waveform instructions to jointly process the output data from the multiple radars to determine a measurement of the environment based on the network waveform.