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arxiv: 2605.19368 · v1 · pith:MCXKRAU2new · submitted 2026-05-19 · ⚛️ physics.optics

Microwave photonic radar jamming and target detection integration based on advanced waveform editing, forwarding, and self-squaring reception

Fangyi Yang , Hang Yang , Xin Zhong , Taixia Shi , Yang Chen This is my paper

Pith reviewed 2026-05-20 03:13 UTC · model grok-4.3

classification ⚛️ physics.optics
keywords microwave photonicsintegrated radar and jammingpseudo-random binary modulationLFM pulsesself-squaring receptionwaveform editingelectronic warfaretarget detection
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The pith

A microwave photonic system integrates radar jamming and target detection by generating noise-like waveforms and using self-squaring reception to remove phase jumps.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper proposes a microwave photonic integrated radar and jamming system to address limitations in traditional electronic systems for operating frequency and bandwidth in complex warfare. It generates IRAJ waveforms by modulating pseudo-random binary coding sequences and frequency-shifting signals onto LFM pulses, creating noise-like jamming that produces random false targets in adversary radars. The central innovation is implementing a time-domain squaring operation during de-chirped reception to overcome random pi-phase jumps, thereby restoring accurate target sensing without needing knowledge of the coding sequence. Experimental validation shows the system produces up to 4 GHz bandwidth waveforms in the 10-28 GHz range, effectively jams both de-chirped and pulse-compression radars, while achieving ranging errors around 5 cm and velocity errors below 4 cm/s. This multifunction approach supports miniaturization and integration demands in modern electronic warfare.

Core claim

The microwave photonic IRAJ system based on pseudo-random binary phase modulation and segmented frequency shifting generates jamming waveforms that appear as irregular random false targets to adversary radars using either de-chirped reception or pulse compression; a time-domain squaring operation in the de-chirped reception path eliminates the random phase jumps, enabling the system's own radar to perform accurate target detection and ranging without prior knowledge of the modulation sequence.

What carries the argument

Time-domain squaring operation applied to the de-chirped signal, which squares away the random π-phase jumps caused by pseudo-random binary phase modulation to restore a clean chirp for target sensing.

If this is right

  • The system achieves effective jamming with bandwidths up to 4 GHz covering 10-28 GHz.
  • It maintains radar performance with ranging error of around 5 cm and radial velocity measurement error below 4 cm/s.
  • The jamming produces irregular and random distribution of false targets against de-chirped or pulse compression receivers.
  • Accurate target sensing is possible without prior knowledge of the coding sequence.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • If scaled, this photonic integration could reduce the size and complexity of electronic warfare platforms by combining jamming and sensing functions in one hardware chain.
  • Similar squaring techniques might apply to other phase-modulated waveforms to enable blind reception in cooperative or contested scenarios.
  • The approach opens possibilities for dynamic waveform adaptation in real-time based on detected threats while preserving sensing capability.

Load-bearing premise

The time-domain squaring operation during de-chirped reception will reliably restore radar detection ability and enable accurate target sensing without prior knowledge of the coding sequence under real-world conditions and against actual adversary systems.

What would settle it

An experiment in which the squaring reception fails to yield ranging errors below 10 cm or velocity errors below 10 cm/s when the generated waveform is applied against a real de-chirping adversary radar with unknown coding sequence.

Figures

Figures reproduced from arXiv: 2605.19368 by Fangyi Yang, Hang Yang, Taixia Shi, Xin Zhong, Yang Chen.

Figure 1
Figure 1. Figure 1: Schematic diagram and experimental setup of the proposed integrated radar detection and jamming system. (a)–(e) are the diagrams of key nodes in the system diagram; (f) time-domain pulses of the generated IRAJ waveforms. LD, laser diode; ISO, isolator; OC, optical coupler; DP-MZM, dual-parallel Mach– Zehnder modulator; MZM, Mach–Zehnder modulator; SMF, single-mode fiber; EDFA, erbium-doped fiber amplifier;… view at source ↗
Figure 2
Figure 2. Figure 2: (a) Spectra of low-frequency radar detection and jamming waveforms with bandwidths of 1, 2, and 4 GHz; (b) spectra of high-frequency IRAJ waveforms with the same bandwidths; (c) spectra of 26–28 GHz IRAJ waveforms with even pulse indices under N=32, 64, 128, 256, 512; (d) time-domain waveforms for N=32; (e) time-domain waveforms for N=512; (f) time-frequency diagrams for IRAJ waveforms with N=32 and L=2; (… view at source ↗
Figure 10
Figure 10. Figure 10: Jamming performance of low-frequency IRAJ waveforms. (a) De-chirped ranging result of 10–14 GHz LFM signal without jamming; (b) De-chirped results under jamming by 10–14 GHz odd-indexed IRAJ waveforms with L=4, where code lengths N=32, 64, 128, 256, and 512 from red to dark blue. (c) Pulse compression ranging result of 10–12 GHz LFM signal without jamming; (d) Pulse compression spectra under jamming by 10… view at source ↗
read the original abstract

The integrated radar and jamming (IRAJ) system provides a promising solution that meets the demands for miniaturization, integration, and multifunctionality in complex warfare environments. However, traditional electronic-domain IRAJ systems face limitations in operating frequency and bandwidth. In this paper, we propose and experimentally demonstrate a microwave photonic IRAJ system based on pseudo-random binary phase modulation and segmented frequency shifting. By modulating pseudo-random binary coding sequence and frequency-shifting signals onto linearly frequency-modulated (LFM) pulses, an IRAJ waveform is generated to achieve noise-like jamming against the adversary radar. To overcome the random {\pi}-phase jumps introduced by pseudo-random binary modulation in the de-chirped signal, a time-domain squaring operation is implemented during de-chirped reception, restoring the radar detection ability of our system and enabling accurate target sensing without prior knowledge of the coding sequence. Experimental results demonstrate that the system can generate IRAJ waveforms with a bandwidth of up to 4 GHz, covering both 10-28 GHz. The proposed system achieves effective jamming against adversary radars employing either de-chirped reception or pulse compression, with the generated jamming results exhibiting an irregular and random distribution of false targets. Meanwhile, the system maintains radar performance with a ranging error of around 5 cm and a radial velocity measurement error below 4 cm/s.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript describes the design and experimental demonstration of a microwave photonic integrated radar and jamming (IRAJ) system. It employs pseudo-random binary phase modulation combined with segmented frequency shifting on linearly frequency-modulated pulses to generate waveforms that enable noise-like jamming against adversary radars. A time-domain squaring operation is introduced in the de-chirped reception to mitigate the effects of random π-phase jumps, thereby restoring the ability to perform accurate target ranging and velocity measurement without prior knowledge of the modulation code. The experimental results claim a generated waveform bandwidth of up to 4 GHz covering 10-28 GHz, effective jamming with irregular false target distributions for both de-chirped and pulse-compression receivers, and self-radar performance characterized by a ranging error of approximately 5 cm and radial velocity error below 4 cm/s.

Significance. Should the central experimental claims be substantiated with additional methodological details, this work would offer a valuable contribution to the field of microwave photonics by demonstrating a compact, integrated solution for simultaneous radar jamming and target detection. The photonic approach potentially overcomes bandwidth limitations of electronic systems, and the self-squaring reception technique provides an interesting method for code-independent detection. The concrete performance metrics reported strengthen the practical relevance of the demonstration.

major comments (2)
  1. [Experimental Results] Experimental Results section: The central claim of maintained radar performance with a ranging error of around 5 cm and velocity error below 4 cm/s relies on the time-domain squaring operation. However, the manuscript provides no information on the experimental setup details, such as the presence of additive noise, sampling frequency, loop-back versus independent adversary radar configuration, or statistical error bars on the measurements. This omission is load-bearing for validating the robustness of the squaring method under realistic conditions.
  2. [System Principle] System Principle section (de-chirped reception description): The analysis shows that squaring s(t) = A exp(j(2π f_b t + φ(t))) with φ(t) ∈ {0, π} yields a tone at 2f_b with phase jumps that are multiples of 2π. This is mathematically correct in the noiseless case, but the manuscript lacks any quantitative treatment or simulation of how additive noise introduces cross terms that broaden the spectral peak and shift its centroid, which directly affects the reported accuracy figures.
minor comments (2)
  1. [Abstract] Abstract: The term 'self-squaring reception' is used here while the body text refers to 'time-domain squaring operation during de-chirped reception'; consistent terminology across the manuscript would improve readability.
  2. [Results figures] Figure captions (assumed in results section): Ensure all figures showing jamming results and range-Doppler maps include scale bars, axis labels with units, and clear indication of whether data are from simulation or experiment.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the positive evaluation of the potential contribution of our work and for the detailed comments that help strengthen the manuscript. We have revised the paper to incorporate additional experimental details and a quantitative noise analysis as requested.

read point-by-point responses

  1. Referee: [Experimental Results] Experimental Results section: The central claim of maintained radar performance with a ranging error of around 5 cm and velocity error below 4 cm/s relies on the time-domain squaring operation. However, the manuscript provides no information on the experimental setup details, such as the presence of additive noise, sampling frequency, loop-back versus independent adversary radar configuration, or statistical error bars on the measurements. This omission is load-bearing for validating the robustness of the squaring method under realistic conditions.

    Authors: We agree that the manuscript would benefit from expanded experimental details to support the reported performance metrics. In the revised version, we have augmented the Experimental Results section with a dedicated paragraph describing the setup parameters, including the sampling frequency of the oscilloscope, the measured additive noise levels in the received signals, confirmation that self-radar characterization was performed in a loop-back configuration, and statistical error bars obtained from repeated measurements under identical conditions. These additions directly address the robustness of the squaring operation. revision: yes

  2. Referee: [System Principle] System Principle section (de-chirped reception description): The analysis shows that squaring s(t) = A exp(j(2π f_b t + φ(t))) with φ(t) ∈ {0, π} yields a tone at 2f_b with phase jumps that are multiples of 2π. This is mathematically correct in the noiseless case, but the manuscript lacks any quantitative treatment or simulation of how additive noise introduces cross terms that broaden the spectral peak and shift its centroid, which directly affects the reported accuracy figures.

    Authors: We acknowledge the value of a quantitative noise analysis to complement the noiseless derivation. We have added a new paragraph and accompanying simulation results in the System Principle section (or as a supplementary figure) that model additive white Gaussian noise, derive the resulting cross terms after squaring, and quantify the spectral peak broadening and centroid shift as functions of SNR. The simulations are calibrated to the noise levels observed in our experiments and confirm that the reported ranging and velocity accuracies remain attainable. revision: yes

Circularity Check

0 steps flagged

No significant circularity; experimental demonstration relies on external photonic and radar principles

full rationale

The paper frames its contribution as an experimental demonstration of a microwave-photonic IRAJ system using pseudo-random binary phase modulation on LFM pulses, with a time-domain squaring step at reception to remove π-phase jumps. This squaring step follows directly from standard complex-envelope signal processing (squaring doubles the beat frequency and converts phase jumps to multiples of 2π) and is not derived from or fitted to the paper's own data or prior self-citations. Reported metrics (up to 4 GHz bandwidth, ~5 cm ranging error, <4 cm/s velocity error) are presented as direct experimental outcomes rather than predictions generated from fitted parameters. No equations reduce to self-definitions, no uniqueness theorems are imported from the authors' prior work, and the central claims remain independent of any self-referential chain. The work is therefore self-contained against external benchmarks in photonics and radar engineering.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The paper is an applied experimental demonstration in microwave photonics and relies on standard background assumptions from optics and radar engineering rather than introducing new fitted parameters or invented entities in the abstract.

pith-pipeline@v0.9.0 · 5785 in / 1111 out tokens · 49552 ms · 2026-05-20T03:13:00.558702+00:00 · methodology

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Reference graph

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