Radar Phase Error Compensation via Lookup Table Interpolation
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Solution Overview
Problem
Current radar systems face challenges in accurately measuring phase errors up to the far-field distance, especially for multi-input multi-output (MIMO) radar devices, due to the large anechoic chambers required, which are constrained in size, leading to difficulties in obtaining precise target information.
Innovation Solution
A phase error compensation device and method that includes determining phase errors for both moving and stationary targets using a lookup table generator, which calculates and stores phase compensation values for each distance, allowing for phase error compensation up to the far-field distance of MIMO radar devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an anechoic chamber is used to measure phase error up to the far-field distance, then measurement precision is improved, but the chamber size must be very large which increases device complexity and space requirements
Solution Approach 1:
The patent divides the phase error measurement process into multiple segments: measuring phase errors at multiple discrete distances (including distances less than the far-field distance) and storing them in a lookup table. This allows the system to handle the far-field condition without requiring a physically large anechoic chamber, as the measurement data is collected at manageable distances and then applied through interpolation for far-field scenarios.
Solution Approach 2:
The patent performs preliminary measurements of phase errors at various distances (including distances shorter than the far-field distance) and stores this data in advance in a lookup table. When actual far-field measurement is needed, the system retrieves and applies the pre-measured data through interpolation, eliminating the need for a very large anechoic chamber while maintaining measurement precision for far-field conditions.
2Measurement precision
If the far-field distance is increased by using larger transmission antenna size, then radar resolution is improved, but the required anechoic chamber size increases proportionally to the square of the antenna size
Solution Approach 1:
The patent segments the far-field distance requirement by measuring phase errors at multiple discrete distances and using a lookup table with interpolation. This allows the system to achieve far-field accuracy without physically constructing a chamber large enough to hold a target at the actual far-field distance, thus resolving the contradiction between antenna size and chamber size.
Solution Approach 2:
The patent creates a virtual copy of the far-field measurement data by measuring at closer distances and storing the results in a lookup table. The system then uses this copied data through interpolation to simulate far-field conditions, allowing large antenna arrays to be evaluated without requiring proportionally large physical space for measurements.
3Area of stationary object
If phase error measurement is performed at distances less than the far-field distance, then measurement is possible within limited chamber size, but phase errors occur due to spherical wave propagation
Solution Approach 1:
The patent performs preliminary phase error measurements at multiple distances less than the far-field distance and stores this data in a lookup table. The system then uses interpolation to estimate phase errors at the actual far-field distance, effectively compensating for the spherical wave propagation effects that occur at closer distances. This allows accurate far-field phase error measurement within a limited chamber size.
Solution Approach 2:
The patent uses the measured phase errors at multiple distances as feedback data to build a lookup table. The system then applies this feedback information through interpolation to correct phase errors in the actual radar signals, compensating for spherical wave propagation effects and achieving accurate far-field performance within a limited measurement chamber.
Data Source
AI summary
The present embodiments relate to a phase error compensation device and method of a radar and a radar device including the same. A phase error compensation device according to an embodiment may include a first determiner configured to determine, for each first distance to a moving target, a first phase error between a phase of a first reception signal corresponding to a first transmission signal transmitted from a first transmission antenna and a phase of a second reception signal corresponding to a second transmission signal from a second transmission antenna, and a lookup table generator configured to generate and store a lookup table for phase compensation including phase compensation values for each distance based on the first phase error for each first distance.