Frequency ambiguity free tiered differential‐polyphase codes for GNSS signal design

Han, Shuangfeng; Kim, J.-B.; Kim, J.-K.; Han, and Kyu-Jin; Kim, K.-J.; Song, Kihyung; Lee, Sang Jeong; Ahn, Jae-Min

doi:10.1049/el.2016.3680

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…Generally, secondary codes used in GNSS are generated by combining 1 and 0. However, a secondary code using the Zadoff-Chu sequence, a polyphase code, has also been proposed [3]. This secondary code is Tiered Differential Polyphase Code(TDPC).…”

Section: Indructionmentioning

confidence: 99%

Acquisition and Tracking Performance of Satellite Navigation System Signal using Tiered Differential Polyphase Code

Jo¹,

Lee²,

Noh³

et al. 2019

Annual of Navigation

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In this paper, we analyze the acquisition and tracking performance of signal using a tiered differential polyphase code as the secondary code. The Zadoff-Chu sequence is known to have a CAZAC (Constant Amplitude Zero Auto-Correlation) characteristics. The secondary code generated by differential encoding of the Zadoff-Chu sequence also has the same characteristics as the Zadoff-Chu sequence. Therefore, long integration will give better correlation results. We compare signal acquisition and tracking performance when using the NH sequence and Zadoff-Chu sequence as the secondary code. Monte-carlo simulation is performed using MATLAB. We use the probability of detection and the mean acquisition time for signal acquisition performance and tracking jitter for signal tracking performance.

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Section: Indructionmentioning

confidence: 99%

Acquisition and Tracking Performance of Satellite Navigation System Signal using Tiered Differential Polyphase Code

Jo¹,

Lee²,

Noh³

et al. 2019

Annual of Navigation

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“…Applying differential decoding at the receiver side removes Doppler. In [20], the authors propose differential polyphase codes to resolve the frequency ambiguity. Another implementation of differential encoding/ decoding is demonstrated in [21].…”

Section: Introductionmentioning

confidence: 99%

Range Estimation of a Moving Target Using Ultrasound Differential Zadoff-Chu Codes

Alsharif¹,

Saad²,

Siala³

et al. 2021

Preprint

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High accuracy range estimation is an essential tool required in many modern applications and technologies. However, continuous range estimation of a moving target is a challenging task, especially under Doppler effects. This paper presents a novel signal design, which we name differential Zadoff-Chu (DZC). Under Doppler effects, DZC sequences improve the performance of the maximum likelihood (ML)-based range estimation compared to its performance when using regular ZC sequences. Moreover, a reduced-complexity ranging algorithm is proposed utilizing DZC sequences and is shown to outperform the regular ZC ML-based range estimation. The proposed system is evaluated in a typical indoor environment, using a low-cost ultrasound hardware. Under a low signal to noise ratio (−10 dB SNR), more than 90% of the range estimates are in less than 1.6 mm error, with a movement range from 0.2 m to 2.2 m and a maximum velocity of 0.5 m/s. For the same movement range, the system provides range estimates with a root mean square error (RMSE) less than 0.76 mm in a high SNR scenario (10 dB), and a MSE less than 0.85 mm in a low SNR scenario (−10 dB). For a larger movement range from 1.8 m to 4.2 m with a maximum velocity of 1.91 m/s, the proposed system provides range estimates with RMSE less than 7.70 mm at 10 dB SNR.

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“…Tiered Polyphase Code (TPC) structures have been proposed to reduce intra-system interference as well as increase processing gain by applying non-binary polyphase codes to the secondary codes. [1,2] On the other hand, with the proliferation of GNSS services, attempts have been made to simultaneously transmit more service signals using the same frequency band. Simultaneous transmission of three or more signals may degrade the power efficiency of the satellite high power amplifier.…”

Section: Introductionmentioning

confidence: 99%

Performance of TPC based ranging signal for more than 2 services multiplexing

Kim

Song

et al. 2019

E3S Web Conf.

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This paper presents signal structure and power efficiency performance for simultaneous transmission of Global Navigation Satellite System (GNSS) service signals based on Tiered Polyphase Code (TPC). For the simultaneous transmission of three or more service signals, the intermodulation terms addition and modification of the power allocations for the signal multiplexing are applied first to the spreading signal with the binary pseudorandom noise (PRN) code and a constant envelope signal is generated. Then, Zadoff-Chu sequence is applied as a secondary code to generate a multiplexed satellite navigation signal having a constant envelope characteristic. Simulation results show that power efficiency performance of more than 80% can be achieved in three service signal multiplexing.

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Frequency ambiguity free tiered differential‐polyphase codes for GNSS signal design

Cited by 5 publications

References 2 publications

Acquisition and Tracking Performance of Satellite Navigation System Signal using Tiered Differential Polyphase Code

Acquisition and Tracking Performance of Satellite Navigation System Signal using Tiered Differential Polyphase Code

Range Estimation of a Moving Target Using Ultrasound Differential Zadoff-Chu Codes

Performance of TPC based ranging signal for more than 2 services multiplexing

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