Multi-Band Radar Reception to Eliminate Eclipse During Transmission
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Solution Overview
Problem
Conventional radar devices experience an eclipse in reception signals due to the inability to receive reflection signals while transmission signals are being transmitted, limiting transmission power and coherent processing intervals.
Innovation Solution
The radar device transmits multiple pulse waves with different frequency bands at varying timings, using a stopband variable filter to block reception signals of the same frequency band as the transmission signal, and employs a mixer, A/D converter, and range Doppler processing to detect targets based on phase corrections and coherent integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the transmission pulse width is limited to reduce eclipse, then the eclipse is reduced, but it is difficult to sufficiently increase transmission power depending on coherent processing interval
Solution Approach 1:
The invention segments the frequency spectrum into multiple bands and transmits different frequency bands at different timings. By receiving signals in frequency bands that are not currently being transmitted, the system eliminates eclipse gaps and enables continuous reception, thereby allowing sufficient transmission power accumulation over the coherent processing interval without being limited by pulse width constraints.
Solution Approach 2:
The invention achieves continuous reception by switching between multiple frequency bands for transmission and reception. While one frequency band is being transmitted, the receiver simultaneously receives reflected signals in other frequency bands, eliminating idle eclipse periods and maintaining continuous useful action throughout the coherent processing interval.
2Power
If the transmission signal is a pulse wave, then the transmission power can be increased, but an eclipse occurs in the acquired reception signal
Solution Approach 1:
The invention divides the operating frequency range into multiple segments or bands. During pulse transmission in one frequency band, the receiver simultaneously processes reflected signals in other frequency bands, thereby maintaining high transmission power while eliminating eclipse through frequency-division multiplexing of transmit and receive operations.
Solution Approach 2:
The invention transitions from time-division-only operation to a two-dimensional approach combining frequency-division and time-division multiplexing. By adding the frequency dimension, the system can transmit high-power pulses in one band while receiving in another band simultaneously, resolving the eclipse problem without sacrificing transmission power.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces eclipse occurrences and allows for longer transmission pulses with increased power, enabling effective target detection even during transmission.
Implementation Method 1
a mixer to down-convert the reception signal for target detection acquired by the transmitting-receiving circuitry
Implementation Method 2
A radar device acquires a reception signal by transmitting a transmission signal to a target and receiving a reflection signal reflected by the target
Implementation Method 3
range Doppler processing circuitry to calculate a range Doppler signal indicating a speed of the target and a distance to the target
Data Source
AI summary
While transmitting any one transmission signal of a plurality of transmission signals, a transmitting-receiving unit in a radar device acquires, as a reception signal for target detection, a reception signal of a frequency band different from a frequency band of the transmission signal, and blocks a reception signal of the same frequency band as the frequency band of the transmission signal.