Combined Signal of Linear Frequency Modulation and Barker Code

This document explores key aspects of radar system simulation. The system's transmitted signal utilizes a hybrid modulation approach combining a 13-bit Barker code with Linear Frequency Modulation (LFM), where the LFM component operates with a 30MHz center frequency and 4MHz bandwidth. Each code chip has a duration of 10 microseconds, and the transmitted signal frame period is 1 millisecond. The radar system incorporates multiple advanced functionalities including digital quadrature demodulation, digital pulse processing, fixed target cancellation, Moving Target Detection (MTD), and Constant False Alarm Rate (CFAR) processing. The digital quadrature demodulation technique employs I/Q signal decomposition to extract baseband components from received signals. Digital pulse processing involves matched filtering operations optimized for the hybrid waveform characteristics. Fixed target cancellation utilizes digital filtering algorithms to suppress stationary clutter signals. Moving Target Detection implements Doppler processing through FFT-based spectral analysis to identify moving targets. The CFAR processing adaptively adjusts detection thresholds using statistical estimation methods while maintaining a constant false alarm probability. Implementation typically involves generating the hybrid waveform through LFM modulation of Barker-coded pulses, followed by digital down-conversion and pulse compression techniques. The signal processing chain may include windowing functions for sidelobe suppression and adaptive algorithms for environmental adaptation. This advanced radar system demonstrates sophisticated signal processing capabilities suitable for modern surveillance applications.