Multicode Aperture Transmitter Reducing RFI
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional phased array antenna systems face issues with Radio Frequency Interference (RFI) and radiation damage due to common transmitter modules and waveforms, leading to power levels exceeding regulatory limits and potential harm to living objects.
Innovation Solution
A multicode transmitter/receiver system that splits signals into low power portions, codes each with orthogonal waveforms, and transmits through individual elements of a phased array antenna, allowing only correlated receivers to decode and combine these signals coherently, reducing detected power and RFI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If common transmitter modules and waveforms are used in traditional phased array antenna systems, then system simplicity is maintained, but Radio Frequency Interference (RFI) and radiation damage occur due to power levels exceeding regulatory limits
Solution Approach 1:
The patent divides the single high-power transmitter into multiple low-power transmitter elements, each transmitting a portion of the coded signal. This segmentation allows the system to maintain simplicity while reducing harmful RFI and radiation effects, as each element operates at lower power levels that comply with regulatory limits.
Solution Approach 2:
The patent changes the power parameter distribution by using multiple low-power elements instead of one high-power element. Each element transmits at reduced power levels, and the coded portions are combined at the receiver to reconstruct the full signal, thereby maintaining system performance while reducing harmful radiation effects.
2Object-affected harmful factors
If signal power is reduced to minimize RFI and radiation hazards, then harmful effects are decreased, but system performance and detection capability deteriorate
Solution Approach 1:
The patent combines multiple low-power coded signals at the receiver end to reconstruct the full-strength original signal. By merging the coded portions from multiple elements and applying the appropriate decoding waveform, the system achieves the same detection capability as high-power transmission while each individual element operates at safe, low power levels.
Solution Approach 2:
The patent introduces coded waveforms as an intermediary mechanism. Each low-power transmitter element modulates its signal with a unique coded waveform, and the receiver uses correlation with these codes to coherently combine the signals. This intermediary coding scheme enables low-power transmission to achieve high-performance reception.
3Object-affected harmful factors
If multiple low-power transmitter elements are used instead of common transmitter modules, then RFI and radiation damage are reduced, but device complexity increases
Solution Approach 1:
The patent makes each transmitter element multi-functional by equipping it with both transmission and reception capabilities, as well as signal coding functionality. This universal design allows the same hardware structure to perform multiple functions, reducing the need for separate dedicated components and thereby limiting the increase in overall system complexity despite using multiple elements.
4Object-affected harmful factors
If coded waveforms are applied to each transmitter element, then signal detection by uncorrelated receivers is reduced, but encoding and decoding complexity increases
Solution Approach 1:
The patent changes the temporal and spectral parameters of the transmitted signal through coding. By spreading the signal energy across time and frequency using coded waveforms, the system makes it difficult for uncorrelated receivers to detect and decode the signal, while the coding complexity remains manageable through the use of standard spreading codes and correlation receivers.
Data Source
Figure 1
Figure 2a~2b
Figure 2c
AI summary
Systems and methods according to one or more embodiments provide for a multicode transmitter/receiver that acts like a high power array when a correlated receiver is used, but acts as a collection of small low gain transmitters when an uncorrelated receiver is used. In one embodiment, a method of transmitting and receiving signals comprises splitting (104) a signal (102) into more than one portion for feeding the signal into separate elements of an array (114); coding (112) each portion of the signal for transmission through each separate element of the array with a different code (fn(t)) respectively; transmitting each coded portion of the signal through a corresponding separate element of the array; receiving the coded portions of the signal by at least one element on a receiver side; decoding the coded portions of the signal; and adding decoded portions of the signal to form a complete received signal.