RF Ranging Receiver AGC for Weak LOS Pulse Detection
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Solution Overview
Problem
RF ranging systems face accuracy degradation due to interference from multipath signals, where receivers typically adjust sensitivity based on stronger reflected pulses, leading to missed detection of weaker direct line-of-sight pulses.
Innovation Solution
Implementing an automatic gain control (AGC) system that initializes in a low or high gain state and dynamically adjusts to prioritize detection of weak direct line-of-sight pulses over strong reflected pulses, using methods such as duty-cycled ADC and multi-stage gain approaches to maintain sensitivity and avoid clipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the receiver gain is increased to detect weak direct line-of-sight pulses, then the detection sensitivity is improved, but the receiver clips strong reflected pulses causing measurement errors
Solution Approach 1:
The patent implements dynamic gain adjustment by transitioning from a static high gain state to a dynamic multi-stage gain approach. The receiver dynamically switches between high gain (for weak signal detection) and low gain (for strong signal handling) states based on signal strength detection, resolving the contradiction between detection sensitivity and signal clipping.
Solution Approach 2:
The patent changes the receiver gain parameter dynamically based on signal conditions. By detecting signal strength and adjusting the gain parameter accordingly (high gain for weak signals, low gain for strong signals), the system maintains optimal detection sensitivity while preventing clipping of strong reflected pulses.
2Stability of the object's composition
If the receiver gain is decreased to avoid clipping strong reflected pulses, then the receiver stability is improved, but the detection of weak direct line-of-sight pulses is lost
Solution Approach 1:
The system transitions from a static low gain state to a dynamic gain adjustment mechanism. By dynamically switching between low gain (for stability with strong signals) and high gain (for sensitivity with weak signals) based on real-time signal strength detection, the receiver maintains both stability and detection capability.
Solution Approach 2:
The patent applies preliminary action by detecting signal strength before final processing. The system performs an initial signal strength assessment and pre-adjusts the gain setting accordingly, ensuring the receiver is properly configured to handle the incoming signal whether weak or strong, thus maintaining both stability and sensitivity.
3Adaptability or versatility
If traditional AGC is used to adapt to strong signals, then the receiver can handle strong reflected pulses, but it reduces sensitivity to weak direct line-of-sight pulses
Solution Approach 1:
The patent inverts the traditional AGC approach by prioritizing weak signal detection over strong signal adaptation. Instead of adjusting gain based on the strongest signal (which causes weak signal loss), the system detects signal strength first and selects gain settings that preserve weak signal detectability while still handling strong signals through appropriate gain reduction only when necessary.
Data Source
AI summary
A receiver, including: a tuner receiving an input signal; a signal processor configured to process the input signal; an automatic gain control (AGC) controller configured to: initialize the receiver in a low gain state; determine the presence of a signal; and increase the receiver gain to determine if a weak signal is present prior to a strong signal.