Radar Ranging System Using True Random Sequence Encryption

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Solution Overview

Problem

Traditional 76.5 GHZ automotive radar systems are vulnerable to attacks, leading to safety accidents due to low accuracy in adverse weather conditions and difficulty in achieving high range resolution with high-speed analog-digital converters.

Innovation Solution

A radar ranging system utilizing a true random generator to modulate and encrypt radar signals, incorporating a BPSK modulator, power amplifier, and down-sampling unit to enhance signal security and resolution, preventing unauthorized access and improving detection accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional 76.5 GHZ automotive radar is used, then the system is simple to implement, but it is easy to be identified and forged by attackers leading to safety accidents

Engineering Contradiction:

Improveradar signal securityVSAvoidhardware structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by generating true random binary sequences in advance and storing them in memory before radar signal transmission. The BPSK modulator uses these pre-generated sequences to modulate carrier signals, encrypting the radar signals before transmission. This preliminary encryption preparation ensures that when signals are transmitted, they are already secured against attacks, resolving the contradiction between enhanced security and system complexity.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If high-speed analog-digital converter is used to achieve high range resolution, then the ranging precision is improved, but it is difficult to realize in specific implementation

Engineering Contradiction:

Improverange resolutionVSAvoidimplementation difficulty

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent replaces the mechanical/electronic high-speed analog-digital conversion system with a signal processing approach. Instead of using high-speed ADCs to achieve high range resolution, the system uses BPSK modulation with true random binary sequences and correlation processing in the digital domain. This substitution achieves high measurement precision through signal processing rather than hardware speed, making the system easier to implement.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If true random generator and BPSK modulator are added to encrypt radar signals, then the security against attacks is improved, but the device complexity increases

Engineering Contradiction:

Improveattack resistanceVSAvoidmodulation system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent uses copying by storing true random binary sequences in memory and cyclically outputting them to the BPSK modulator. The system creates copies of the encryption sequences from the stored memory, allowing continuous encryption without requiring a continuously running true random generator. This copying approach from pre-generated sequences simplifies the overall system complexity while maintaining strong encryption capabilities.

Inventive Principle:

Principle #26Copying

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

The system effectively encrypts radar signals, reducing the risk of attacks and improving range resolution, ensuring safer operation in various weather conditions.

Implementation Method 1

The BPSK modulator uses the true random binary sequence to phase-modulate a carrier signal

Methodology Applied

Scientific EffectPhase modulation: Phase Modulation

Implementation Method 2

the reflected radar signal has its signal-to-noise ratio improved by the low-noise amplifier

Methodology Applied

Scientific EffectSignal amplification:

Implementation Method 3

The carrier signal is a radar signal generated by an external clock source through a frequency multiplier

Methodology Applied

Scientific EffectFrequency multiplication:

Implementation Method 4

an output signal of the sampling clock generator down samples the intermediate frequency signals generated by the first mixer and the second mixer

Methodology Applied

Scientific EffectDown-sampling:

Implementation Method 5

the analog-digital converter converts the sampled analog signal into a digital signal that is cross-correlated with the true random binary sequence

Methodology Applied

Scientific EffectAnalog-to-digital conversion:

Data Source

PatentUS11914068B2Radar ranging system based on true random generator and ranging method thereof

Publication Date: 2024.02.27 TAIYUAN UNIVERSITY OF TECHNOLOGY

AI summary

The present disclosure relates to a radar ranging system based on a true random generator and a ranging method thereof The present disclosure adopts the following technical scheme: the system comprises a radar signal modulation and transmission unit and a radar signal receiving and processing unit, wherein the radar signal modulation and transmission unit inputs and stores a true random binary sequence generated by the true random generator in a memory, and cyclically outputs the true random binary sequence to a BPSK modulator for phase modulation. The receiving and amplifying unit receives the reflected radar signal. The down-sampling unit down samples the intermediate frequency signal generated by the mixers. The data processing unit converts the sampled analog signal into a digital signal and cross-correlates the signal with the true random binary sequence in the memory, so as to obtain the distance to the object side to be measured.