Continuous-Wave Radar Direction Determination Using Overlapping Transceiver Fields
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Solution Overview
Problem
Radar systems using continuous-wave radio signals struggle to accurately determine the direction of targets due to limitations in measuring distance, as they cannot utilize the delay between signal transmission and return for range calculation, and typically require multiple receiving antennas for direction determination, which can lead to interference and complexity.
Innovation Solution
A radar system transmits continuous-wave radio signals in distinct directions with overlapping fields of view, using a controller to calculate the target direction as a weighted average of signal amplitudes from multiple transceivers, allowing for separation of signal contributions from multiple targets at different distances without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple receiving antennas are used to determine target direction, then direction determination capability is improved, but device complexity and signal interference increase
Solution Approach 1:
The patent divides the receiving function into multiple spatially distributed transceiver units, each with its own antenna. Each transceiver independently receives signals and performs initial processing, then results are combined centrally. This segmentation allows direction determination through spatial diversity while keeping each individual receiver simple.
Solution Approach 2:
The patent transitions from using multiple antennas at a single location to using transceivers distributed across multiple spatial locations. By adding the spatial dimension of distribution, the system achieves direction determination capabilities without requiring multiple antennas at each point, thus reducing local complexity while maintaining overall measurement precision.
2Measurement precision
If multiple transceivers with overlapping fields of view are used, then target direction and distance measurement precision is improved, but signal processing complexity increases
Solution Approach 1:
The patent combines the results from multiple transceivers through a central processing unit that integrates direction and distance measurements from overlapping fields of view. By merging individual transceiver outputs rather than processing all signals simultaneously, the system achieves high measurement precision while managing processing complexity through hierarchical combination.
Solution Approach 2:
The patent introduces a central controller as an intermediary that receives processed data from multiple transceivers and performs the complex integration of direction and distance measurements. This intermediary approach allows individual transceivers to remain relatively simple while the central unit handles the sophisticated signal combination and measurement fusion.
3Device complexity
If continuous-wave radio signals are used, then system simplicity is maintained, but distance measurement capability is lost
Solution Approach 1:
The patent makes the continuous-wave transceiver system multi-functional by enabling it to perform both direction determination (through spatial distribution and signal comparison) and distance measurement (through signal amplitude analysis and geometric relationships). This universality allows the simple continuous-wave architecture to achieve multiple measurement capabilities without switching to more complex radar systems.
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 approach enables accurate determination of target direction and distance by integrating signal amplitudes across overlapping fields of view, effectively separating targets' contributions and improving the precision of direction and distance measurement in radar systems.
Implementation Method 1
An unmodulated continuous-wave transmitting transceiver, i.e transmitting at a constant frequency, referred to hereinafter as CW, utilizes the Doppler effect in the signal reflected from a target that moves with an instantaneous velocity change calculated as a change of the path that connects the transmitter, the target and the receiver.
Implementation Method 2
The transmission of a radio-frequency signal of this type allows the distance of a target from the radar to be determined from the frequency difference between the transmitted signal and the return signal reflected from the target, because the frequency difference is related with the time delay between the two signals.
Data Source
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AI summary
A system (1) and a method for finding the direction (θ) of a target (6) in a detection plane, e.g. the azimuthal plane. The system comprises a plurality of transceivers (2a, 2b, 2c) which transmit continuous-wave radio signals (4) oriented in distinct main directions of transmission (5a, 5b, 5c) and receive a return radio signal (7) reflected from a target (6), wherein the transceivers have partially overlapping angular fields of view. A controller (9) analyzes the transmitted and return signals by calculating signal amplitudes associated with the return signals and determining the direction (θ) of the target as a direction of a mean signal vector obtained from signal vectors having as a modulus the signal amplitudes of respective transceivers.