Single-Chain IFF Interrogation Transmission Across 1030/1090 MHz
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Solution Overview
Problem
Current radio transmission devices for IFF communications require separate transmission chains for different frequencies, leading to increased weight, volume, and consumption, particularly in small aircraft and drone applications, as they struggle to efficiently transmit various types of signals compatible with existing standards.
Innovation Solution
A radio transmission device with a selection block and pre-distortion capabilities allows for the generation and amplification of interrogation signals on multiple frequencies using a single chain, employing a programmable logic circuit and digital-to-analogue conversion to manage pulse shaping and bias voltage, enabling efficient transmission of both Mode S and TCAS signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate transmission chains are used for different frequencies (1090 MHz for Mode S and 1030 MHz for TCAS), then each frequency can be transmitted with optimal performance, but the weight, volume, and power consumption increase significantly
Solution Approach 1:
The patent implements a universal transmission chain capable of operating at multiple frequencies (1030 MHz and 1090 MHz) by using a programmable logic circuit that can be configured through digital-to-analogue conversion to manage pulse shaping and bias voltage for different frequency requirements. This single multi-functional chain replaces what would traditionally require separate dedicated chains for each frequency, thereby reducing weight while maintaining transmission performance.
2Reliability
If separate transmission chains are used for different frequencies, then each chain can be optimized for its specific frequency, but the volume and power consumption increase
Solution Approach 1:
The transmission chain is designed as a universal system that can be dynamically reconfigured for different frequencies using digital-to-analogue conversion and programmable logic circuits. This allows a single chain to perform the functions of multiple dedicated chains, optimizing power consumption by avoiding the simultaneous operation of multiple independent chains while maintaining the ability to deliver optimal performance for each frequency when needed.
3Weight of moving object
If a single transmission chain is used for multiple frequencies, then weight, volume, and consumption are reduced, but the ability to maintain spectral and temporal masks for different signal types becomes more difficult
Solution Approach 1:
The patent employs parameter changes through programmable logic circuits and digital-to-analogue conversion to dynamically adjust pulse shaping and bias voltage parameters according to the selected frequency and signal type. This allows the single transmission chain to adapt its characteristics to meet the specific spectral and temporal mask requirements for Mode S at 1090 MHz and TCAS at 1030 MHz, maintaining compliance despite the multi-frequency operation.
4Manufacturing precision
If pulse shaping is applied to control the spectral mask, then in-band filtering and EVM performance improve, but the complexity of implementing multi-frequency operation increases
Solution Approach 1:
The patent replaces traditional mechanical or analog pulse shaping methods with programmable logic circuits and digital-to-analogue conversion. This substitution allows for software-defined pulse shaping that can be reconfigured for different frequencies and signal types, maintaining spectral mask compliance while reducing hardware complexity compared to having separate dedicated circuits for each frequency.
Data Source
AI summary
A radio transmission device for the radio transmission of an interrogation signal based on a signal to be amplified is provided. This method comprises a generator for generating a signal to be amplified, and a selection block for selecting a type of interrogation signal to be transmitted from among at least two different types of signals. The generator for generating a signal to be amplified is configured so as to allow transmission of the signal to be amplified so as to generate the interrogation signal corresponding to the selected type of interrogation signal.