Amplitude Goniometer Sampling Frequency Distribution
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Solution Overview
Problem
Current radar goniometers face challenges in minimizing the number of digital receiver modules due to high instantaneous bandwidth requirements, leading to increased cost, volume, mass, consumption, heat dissipation, and reliability issues, particularly when dealing with very high frequency ranges and ambiguous frequency measurements.
Innovation Solution
The proposed solution involves distributing non-multiple sampling frequencies across receiver channels in interferometers and amplitude goniometers, using pairs of analog-digital conversion modules per receiver channel to minimize the number of digital receiver modules while ensuring phase and amplitude measurements, and optimizing sampling frequency distribution to compensate for phase terms and reduce frequency ambiguity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple digital receiver modules are used to handle high instantaneous bandwidth, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The system divides the high instantaneous bandwidth into multiple lower bandwidth channels, each handled by a separate digital receiver module. This segmentation allows the use of fewer modules while maintaining overall measurement precision through parallel processing of divided frequency bands.
Solution Approach 2:
The patent introduces frequency dimension by using multiple sampling frequencies (including non-integer multiples) to process different portions of the bandwidth. This dimensional approach allows efficient utilization of digital receiver modules, reducing their total number while maintaining measurement precision through frequency-domain division.
2Measurement precision
If multiple digital receiver modules are used to resolve frequency ambiguity, then measurement precision is improved, but mass and volume increase
Solution Approach 1:
The system changes the sampling frequency parameter by using multiple different sampling frequencies (including non-integer multiples of a base frequency) across different receiver channels. This parameter variation allows resolution of frequency ambiguity through comparison and synthesis of measurements taken at different rates, achieving precise frequency determination without requiring a large number of heavy receiver modules.
3Measurement precision
If multiple digital receiver modules are used to ensure spectral integrity, then measurement precision is improved, but power consumption increases
Solution Approach 1:
Each digital receiver module is designed to handle multiple sampling frequencies and process multiple frequency bands. This multi-functionality allows fewer modules to achieve the same spectral integrity that would otherwise require more specialized, single-function modules, thereby reducing overall power consumption while maintaining measurement precision.
4Measurement precision
If multiple digital receiver modules are used to process high bandwidth signals, then measurement precision is improved, but heat dissipation increases
Solution Approach 1:
The high bandwidth signal processing task is segmented across multiple channels, each operating at lower individual power levels. By dividing the total processing load into smaller segments handled by fewer digital receiver modules using multiple sampling frequencies, the system reduces cumulative heat dissipation while maintaining overall signal processing precision.
Data Source
AI summary
The present invention relates to an amplitude goniometer comprises P receiver channels, P being greater than or equal to 2, each receiver channel being identified by an index p, each receiver channel comprising an antenna coupled to a receiver chain followed by at least two digital receiver modules each comprising an analogue-to-digital conversion module associated with a respective sampling frequency, each sampling frequency not complying with the Shannon criterion and not being a multiple of another frequency, N being the number of frequencies, N being greater than or equal to 2, each frequency being referenced by an index n, the amplitude goniometry estimator working from the amplitudes of the signals originating from at least Q adjacent receiver channels of the P receiver channels, Q being at most equal to P, the sampling frequencies being associated with the analogue-to-digital conversion modules of the Q adjacent receiver channels.