# A Novel Jamming Method against SAR Using Nonlinear Frequency Modulation Waveform with Very High Sidelobes

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## Abstract

**:**

## 1. Introduction

## 2. Design Method for NLFM Waveforms

#### 2.1. Coding Model

#### 2.2. Correlation Function

#### 2.3. Optimization

## 3. Simulations and Analysis

#### 3.1. Point Target Simulation

#### 3.2. Distributed Scene Simulation

## 4. Conclusions

## Author Contributions

## Funding

## Data Availability Statement

## Conflicts of Interest

## Abbreviations

SAR | Synthetic aperture radar |

NLFM | Nonlinear frequency modulation |

LFM | Linear-frequency-modulated |

Quad-Pol | Quadrature-polarimetric |

DRFM | Digital radio frequency memory |

PSD | Power spectral density |

POSP | Principle of stationary phase |

ALGA | Augmented Lagrangian genetic algorithm |

CCE | Cross-correlation energy |

PWL | Piecewise linear |

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**Figure 3.**Comparison between LFM waveform and the designed NLFM waveform. (

**a**) Autocorrelation and cross−correlation functions; (

**b**) enlarging and upsampling result of the area marked by the rectangle in (

**a**).

**Figure 5.**Imaging results of jamming and desired signals with respect to pointlike targets. (

**a**) Target response of desired signal; (

**b**) target response of jamming signal.

Parameters | Value |
---|---|

Orbit height | 607 Km |

Center frequency | 1.26 GHz |

SAR pulse width | 80 $\mathsf{\mu}$s |

Bandwidth | 60 MHz |

Sampling rate | 72 MHz |

PRF | 3320 Hz |

Antenna type | Planar |

Antenna length in azimuth | 10 |

Antenna length in elevation | 5 |

Look angle | 25${}^{\circ}$ |

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## Share and Cite

**MDPI and ACS Style**

Song, C.; Wang, Y.; Jin, G.; Wang, Y.; Dong, Q.; Wang, B.; Zhou, L.; Lu, P.; Wu, Y.
A Novel Jamming Method against SAR Using Nonlinear Frequency Modulation Waveform with Very High Sidelobes. *Remote Sens.* **2022**, *14*, 5370.
https://doi.org/10.3390/rs14215370

**AMA Style**

Song C, Wang Y, Jin G, Wang Y, Dong Q, Wang B, Zhou L, Lu P, Wu Y.
A Novel Jamming Method against SAR Using Nonlinear Frequency Modulation Waveform with Very High Sidelobes. *Remote Sensing*. 2022; 14(21):5370.
https://doi.org/10.3390/rs14215370

**Chicago/Turabian Style**

Song, Chen, Yu Wang, Guodong Jin, Yu Wang, Qinghai Dong, Bingnan Wang, Liangjiang Zhou, Pingping Lu, and Yirong Wu.
2022. "A Novel Jamming Method against SAR Using Nonlinear Frequency Modulation Waveform with Very High Sidelobes" *Remote Sensing* 14, no. 21: 5370.
https://doi.org/10.3390/rs14215370