Design and Performance Analysis of Navigation Signal Based on OFDM

Abstract

This paper proposes a new navigation modulation based on orthogonal frequency division multiplexing (OFDM). We derived the autocorrelation function and power spectral density of the OFDM modulation. The influence of the cyclic prefix and zero-padding is discussed. The influence of OFDM modulation parameters on navigation signal performance was deeply analyzed, which can help signal designers choose the OFDM parameters. The main peak of the proposed autocorrelation function is narrow and has good tracking accuracy. The sidelobe is lower, and the delay locking loop is more robust. The power spectrum density is evenly distributed in the main lobe of the signal, and the anti-interference is good. By comparing OFDM navigation signals with other navigation signals, it can be found that OFDM navigation signals have good tracking accuracy and a strong anti-interference ability. Combined with the proposed navigation modulation and communication signal, the OFDM navigation signal has a low bit error rate for the communication signal and has a good communication integration potential, which can meet the business requirements of the future communication and navigation integration market.

A Channel Compensation Technique Based on Frequency-Hopping Binary Offset Carrier Modulated Signal

“…The authors in [18,19] also applied signal detection techniques based on time-frequency signal analysis to compensate Doppler shift, such as short-time Fourier transform (STFT), continuous wavelet transform (CWT), etc. Additionally, the Doppler effect in frequency also changes orthogonal frequency division multiplexing (OFDM) signal waveform, and a kind of OFDM-modulated navigation signal is proposed in [20] to provide a feasible solution. Latency is another factor diminishing the quality of the received signal, usually presented as multipath interference, which leads to the distortion of the autocorrelation function (ACF) of PRN code and then the failure of signal detection.…”