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表面声波（SAW）器件所产生的大时宽大颁宽的线性调频信号在脉冲压缩雷达、逆合成孔径雷达（ISAR）等设备中得到广泛的应用，其调频线性度对设备性能有着重要的影响，因此测量SAW器件所产生线性调频信号的调频线性度就成为评价该器件性能的关键技术．信号频率是线性调制，其相位就是平方率调制，在调制时间（脉冲宽度）内，信号相位将变化几千个360°，在这么大的测量数据中，使测量精度为几度十分困难．本文利用HP8510B网络分析仪（其洲相精度为0．2°）的高精度和数字信号处理技术，解决了线性调频信号调频非线性的测量问题，并给出了测量结果．
Large-scale wide-spread chirp signals generated by surface acoustic wave (SAW) devices are widely used in pulse compression radar and inverse synthetic aperture radar (ISAR) devices, and their FM linearity has an important impact on device performance. Therefore, the frequency linearity of the chirp signal generated by the SAW device has become the key technology to evaluate the performance of the device. The signal frequency is linearly modulated and its phase is the square-rate modulation. In the modulation time (pulse width), the signal phase changes by several thousands of 360 °. In such a large measurement data, it is very difficult to make the measurement accuracy several degrees. In this paper, the HP8510B network analyzer (its phase accuracy of 0.2 °) of high-precision and digital signal processing technology to solve the chirp FM nonlinear measurement problems and gives the measurement results.