Digital Radar Receiver Using Random Channel Selection
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Solution Overview
Problem
Conventional radar detectors face challenges in detecting short pulsed radar signals due to their slow response time and limited sensitivity, particularly with the emergence of POP-mode radar technology that uses brief pulses, making it difficult to achieve a balance between response time and sensitivity.
Innovation Solution
The implementation of a digital radar detection method that involves direct IF sampling, using a wide band analog-to-digital converter to digitize the intermediate frequency, and processing the data in the digital domain, allowing for concurrent averaging and analysis across multiple channels, with a dynamic self-adapting threshold and pseudo-random or random channel selection to enhance detection speed and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If analog detection methods involving FM demodulators are used, then the detector can achieve good sensitivity to RADAR signals over noise by scanning narrow frequency bands, but the response time becomes slow and the detector cannot detect short pulsed radar signals
Solution Approach 1:
The patent replaces the analog FM demodulator system with a digital signal processing system. The digital receiver directly samples the intermediate frequency signal and processes it using digital techniques, eliminating the mechanical limitations of analog demodulation. This substitution enables both high sensitivity through digital filtering and fast response time through rapid digital processing of short pulses.
Solution Approach 2:
The patent changes the detection approach by using digital signal processing parameters instead of analog parameters. By implementing digital downconversion, digital filtering, and digital detection algorithms, the system can dynamically adjust detection parameters to achieve both narrow band sensitivity and fast response to short pulses, resolving the contradiction between measurement precision and speed.
2Measurement precision
If narrow frequency bands are scanned at specific times to achieve good sensitivity, then sensitivity to RADAR signals is improved, but the detector cannot detect short pulsed radar signals that may occur at any frequency
Solution Approach 1:
The digital signal processing system performs multiple functions: it can detect continuous wave radar signals with high sensitivity through digital filtering, and simultaneously detect short pulsed radar signals across the entire frequency range. The same digital receiver and processor handle both detection modes, providing universal capability that resolves the contradiction between sensitivity and frequency coverage adaptability.
Solution Approach 2:
The digital receiver continuously samples and processes the intermediate frequency signal without the intermittent scanning required by analog systems. This continuous digital processing enables the detector to maintain sensitivity while simultaneously monitoring the entire frequency range for short pulses, eliminating the trade-off between narrow band sensitivity and broad frequency coverage.
Data Source
AI summary
A method and apparatus are provided for detecting a RADAR signal. RADAR channel data in a frequency range is received, where the frequency range is divided into a plurality of equally wide channels. The received RADAR channel data is digitally processed and analyzed to identify a signal in the RADAR channel data in the frequency range. The frequency range is advanced to a next channel of the plurality of channels, where the frequency range of the next channel of the plurality of channels is non-sequential with the frequency range of the first channel. The steps of receiving, processing, and analyzing are repeated for the next channel of the plurality of channels.