Novel zero intermediate frequency pulse compression radar system and signal performance compensation method thereof

Abstract

The invention discloses a novel zero intermediate frequency pulse compression radar system and a signal performance compensation method thereof. Radar echo signals are divided into an I channel and a Q channel after passing through a low noise amplifier and respectively and sequentially pass through a predefined filter and an analog-to-digital converter to be connected to a digital processor, and the digital processor performs pulse compression and signal performance compensation on the signals. The predefined filter is used for filtering frequency bands of the direct current offset and flicker noise of a zero intermediate frequency receiver, and a high-pass filter is used for determining the cut-off frequency by measuring the bandwidth of the frequency band of the flicker noise. According to the novel zero intermediate frequency pulse compression radar system and the signal performance compensation method thereof, a circuit can be made through monolithic integration, the advantage of high range resolution of traditional pulse compression radar is obtained, the deficiency of the performance of the zero intermediate frequency receiver is overcome, and the application to pulse compression radar systems in high demand becomes possible, so that the radar system of high performance, low energy consumption, low cost and small size is obtained; the wide application to small radar systems such as close range automatic safety detection systems and high sensitivity visual signal detectors is also available.

Description

technical field [0001] The invention relates to a radar system and a compensation method thereof, in particular to a novel zero-intermediate frequency pulse compression radar system and a signal performance compensation method thereof in the field of communication and radar systems. Background technique [0002] Zero-IF receivers have been widely used in mobile communication systems. Over the past decade, many improvements have been applied to zero-IF systems in order to achieve monolithic integration. Includes AC coupling to remove DC components, arctangent demodulation for DC offset compensation, variable gain amplifier (VGA) for DC offset removal, design of low flicker noise RF mixers, and optimization of flicker noise corner frequencies by signal processing reduce. However, the ideal way to overcome the effects of DC offset and flicker noise is to modify the baseband signal to completely filter out the DC offset without losing any information. Such modulation schemes ...

AI Technical Summary

Problems solved by technology

So far, little attention has been paid to pulse compression radars based on zero-IF architecture, whose performance suffers from DC offset and flicker noise

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