Radar Pulse Generator Polyphase Synthesis Frequency Hopping

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Solution Overview

Problem

Existing frequency-hopped radar systems face inefficiencies and calibration issues due to computationally expensive and slow carrier frequency modifications, as well as poor out-of-band performance in prior art methods.

Innovation Solution

A radar pulse generator employing a multiplexer, polyphase synthesizer, and signal channels to efficiently modify carrier frequencies, utilizing a multiplexer control signal to select and synthesize output signals, enabling real-time frequency hopping with improved spectral efficiency and out-of-band suppression.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If prior art multicarrier and frequency-hopped radar techniques are used, then jam resistance and target information gathering are improved, but computational complexity increases and frequency modification becomes slow

Engineering Contradiction:

Improvejam resistanceVSAvoidcomputational complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The radar signal generation is segmented into multiple parallel polyphase channels (e.g., 4-phase, 8-phase, or 16-phase structures). Each channel processes a portion of the frequency spectrum independently, allowing parallel computation that reduces overall computational complexity while maintaining jam resistance through multicarrier diversity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent replaces traditional mechanical or sequential frequency hopping mechanisms with a digital polyphase synthesis system. The multiplexer dynamically switches between polyphase channels based on desired frequency hops, eliminating computationally expensive real-time frequency transformations and enabling rapid frequency modification through simple channel selection

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If prior art frequency hopping methods are used, then frequency modification capability is improved, but out-of-band suppression performance deteriorates

Engineering Contradiction:

Improvefrequency modification capabilityVSAvoidout-of-band emissions

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

Each polyphase channel is designed with localized frequency characteristics and dedicated filtering. The polyphase filters are optimized to confine each channel's spectral content to its assigned bandwidth, ensuring that when channels are multiplexed, their spectral contents combine cleanly without excessive out-of-band emissions

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs nested polyphase filter structures where smaller filter stages are combined hierarchically to form larger filtering systems. This nested architecture achieves high out-of-band suppression through cascaded filtering effects while maintaining efficient computation through the polyphase structure

Inventive Principle:

Principle #7Nested doll (Nesting)

3Device complexity

If traditional radar pulse generation is used, then system simplicity is maintained, but frequency hopping speed and efficiency are reduced

Engineering Contradiction:

Improvesystem simplicityVSAvoidfrequency hopping speed

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The polyphase channels are pre-computed and stored in memory, with all filtering and frequency transformation operations performed in advance during system initialization or waveform programming. During operation, frequency hopping is achieved by simply selecting different pre-computed channels via the multiplexer, eliminating real-time computational delays and enabling rapid frequency switching

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10921423B2Multicarrier and frequency hopped radar waveform generator using efficient digital synthesis

Publication Date: 2021.02.16 THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY

AI summary

A radar pulse generator includes a multiplexer, a polyphase synthesizer, a first signal channel and a second signal channel. The multiplexer has a baseband radar pulse input, a multiplexer control input, a first channel output and a second channel output. The baseband radar pulse input signal is a single channel baseband radar pulse signal. The multiplexer control input signal selects one of the group consisting of the first channel output and the second channel output. The polyphase synthesizer synthesizes the first channel output signal, synthesizes the second channel output signal and outputs a desired radar pulse signal based on the synthesized first channel output signal and the synthesized second channel output signal. The first signal channel provides the first channel output signal from the first channel output to the polyphase synthesizer. The second signal channel provides the second channel output signal from the second channel output to the polyphase synthesizer.