Jammer Using Continuous Phase Modulation Waveform
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Solution Overview
Problem
Current jammers are ineffective due to advancements in frequency hopping and spread spectrum technologies, often jamming unwanted communications and requiring costly, power-consuming high-resolution Fast Fourier Transform (FFT) blocks to detect and counter unknown modulation formats.
Innovation Solution
A communications system using a jammer with a controller that generates a continuous phase modulation (CPM) waveform with a constant envelope, allowing it to overlap and jam intended signals while avoiding costly and power-intensive high-resolution FFT blocks by using a simpler FPGA circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If high-resolution Fast Fourier Transform (FFT) blocks are used to detect unknown modulation formats, then the ability to jam various receiver types is improved, but power consumption and cost increase
Solution Approach 1:
The patent changes the modulation parameter from high-resolution FFT-based detection to continuous phase modulation (CPM) with constant envelope. This parameter change allows the jammer to effectively jam various receiver types without requiring complex high-resolution FFT blocks, thereby reducing power consumption while maintaining versatility.
Solution Approach 2:
The patent replaces expensive, power-consuming high-resolution FFT blocks with simpler, cheaper CPM waveform generation. The CPM approach uses less complex hardware that consumes less power, effectively substituting a costly component with a more economical solution that achieves the same jamming objective.
2Adaptability or versatility
If barrage jammers transmit high power over broad bands, then the ability to jam multiple channels is improved, but energy density in individual channels decreases
Solution Approach 1:
The patent applies local quality by using CPM waveforms that concentrate jamming energy locally in the target channel while maintaining the ability to jump to multiple channels. The constant envelope CPM signal provides high power density in the current target channel, unlike barrage jammers that spread power thinly across all channels.
Solution Approach 2:
The patent uses dynamic frequency hopping with CPM modulation, allowing the jammer to quickly switch between channels while maintaining high power density in each targeted channel. This dynamic approach combines the versatility of multi-channel jamming with the effectiveness of concentrated power in individual channels.
3Device complexity
If single carrier jammers use simple frequency transmission, then device complexity is reduced, but effectiveness against frequency hopping and spread spectrum decreases
Solution Approach 1:
The patent employs periodic frequency hopping with CPM modulation, where the jammer systematically jumps between frequencies in a periodic manner. This periodic action maintains relatively simple device structure while significantly improving effectiveness against frequency hopping and spread spectrum techniques compared to static single carrier jammers.
Solution Approach 2:
The patent introduces dynamic frequency hopping capability using CPM modulation, transforming the static single carrier approach into a dynamic multi-frequency system. This dynamic behavior improves jamming effectiveness against modern anti-jamming techniques while keeping device complexity manageable through efficient CPM implementation.
Data Source
AI summary
A communications system includes a target receiver having a passband and configured to receive an intended signal within the passband. The communications system also includes a jammer configured to jam the target receiver from receiving the intended signal. The jammer has at least one antenna, a jammer receiver coupled to the at least one antenna, a jammer transmitter coupled to the at least one antenna, and a controller configured to cooperate with the jammer receiver. The controller is configured to detect the intended signal and to generate an interfering signal comprising a continuous phase modulation (CPM) waveform having a constant envelope so that the interfering signal at least partially overlaps the passband of the target receiver.