Projectile Tracking Using Pseudo-Random Noise Code
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Solution Overview
Problem
Current wireless distance measurement techniques for tracking projectiles lack precision due to limitations in power peak requirements for pulse rising time detection, especially when GPS is unavailable or jammed.
Innovation Solution
A projectile tracking system using a pseudo random noise code, where a ground tracking device transmits a pseudo random noise code-based tracking packet signal, and the projectile's beacon processing device generates and transmits a response packet signal, allowing the ground device to calculate transmission/reception delay time for accurate distance measurement and trajectory tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pulse rising time detection method is used for distance measurement, then distance measurement can be performed without GPS, but measurement precision is limited due to power peak requirements
Solution Approach 1:
The patent replaces the traditional pulse rising time detection method with a pseudo-random noise code correlation method. Instead of detecting pulse rising edges which requires high power peaks, the system uses correlation processing of pseudo-random noise codes to achieve precise timing measurement. This substitution of detection methodology enables high-precision distance measurement with significantly reduced transmission power requirements (approximately 1/100 of traditional methods).
Solution Approach 2:
The patent changes the signal representation from simple pulses to pseudo-random noise coded signals. By spreading the signal energy over a wider bandwidth and using code division multiplexing, the system achieves better signal-to-noise ratio in correlation detection, enabling precise timing measurement without requiring high peak power. The parameter change from time-domain pulse detection to frequency-domain correlation processing resolves the power-precision contradiction.
2Measurement precision
If traditional pulse-based tracking signal is used, then simple signal structure is maintained, but timing error correction precision is insufficient
Solution Approach 1:
The patent substitutes simple pulse detection with pseudo-random noise code correlation processing. The correlation method provides inherent timing error correction capability because the correlation peak sharply indicates the precise alignment between transmitted and received codes. Although the signal processing is more complex, the timing precision improvement is substantial, enabling accurate distance measurement without requiring overly complex additional correction mechanisms.
Data Source
AI summary
Disclosed are a projectile tracking method using a pseudo random noise code and an apparatus therefor. A projectile tracking system which tracks a projectile using a pseudo random noise code according to an exemplary embodiment of the present invention includes a beacon processing device which is provided in a projectile to acquire a tracking packet signal and generates and transmits a response packet signal based on a pseudo random noise code included in the tracking packet signal; and a ground tracking device which transmits the tracking packet signal to the projectile, acquires the response packet signal, calculates a transmission/reception delay time using a packet reception time determined based on a timing error for the response packet signal, and calculates a distance from the projectile using the transmission/reception delay time to track a flight trajectory of the projectile.