Radar Distance Ambiguity Resolution via Multi-PRF Pulse Measurement
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Solution Overview
Problem
High-PRF pulse radars experience distance ambiguity issues when measuring targets at distances greater than the maximum distance corresponding to the pulse repetition period, leading to inaccurate object location information.
Innovation Solution
The method involves performing pulse measurement on a target object using two types of pulse signals with different pulse repetition frequencies, which are prime numbers of each other, to eliminate measurement errors caused by distance ambiguity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-PRF pulse signals are used for radar measurement, then transmit power and clutter suppression capability are improved, but distance ambiguity occurs when target distance exceeds maximum distance corresponding to pulse repetition period
Solution Approach 1:
The patent applies periodic action by using multiple pulse repetition frequencies (PRFs) in sequence. The system transmits radar signals with different PRFs (e.g., first PRF and second PRF) and processes the reflected signals to resolve distance ambiguity. By periodically varying the PRF and combining measurements from multiple PRFs, the system achieves both high transmit power (through high-PRF operation) and accurate distance measurement (through multi-PRF processing), thus resolving the contradiction between power and measurement precision.
2Object-affected harmful factors
If high-PRF pulse signals are used for radar measurement, then clutter suppression capability is improved, but distance ambiguity occurs when target distance exceeds maximum distance corresponding to pulse repetition period
Solution Approach 1:
The system uses periodic variation of pulse repetition frequencies to simultaneously achieve clutter suppression and accurate distance measurement. By transmitting signals with different PRFs and processing the combined results, the system maintains the clutter suppression benefits of high-PRF operation while eliminating distance ambiguity through multi-PRF measurement synthesis.
3Length of stationary object
If pulse repetition frequency is increased to improve measurement coverage, then maximum measurable distance is extended, but distance ambiguity occurs and measurement accuracy deteriorates
Solution Approach 1:
The patent resolves this contradiction by periodically transmitting radar signals with multiple different pulse repetition frequencies and combining the measurements. This allows the system to effectively extend the maximum measurable distance while maintaining high measurement accuracy, as the multi-PRF processing eliminates distance ambiguity that would otherwise occur at extended ranges.
Solution Approach 2:
The system changes the pulse repetition frequency parameter dynamically, using multiple PRF values (e.g., switching between first PRF and second PRF) to resolve distance ambiguity. By varying this key parameter and processing measurements from different PRF settings, the system achieves both extended measurement coverage and maintained accuracy.
Data Source
AI summary
This application provides example object locating methods and apparatuses. One example method includes performing, by a first device, pulse measurement on a target object with assistance of a second device, where the pulse measurement is performed on the target object by using two types of pulse signals, and pulse repetition frequencies of the two types of pulse signals are different. The first device can then locate the target object based on a pulse measurement result of the pulse measurement.