A High-Precision and Low-Cost Broadband LEO 3-Satellite Alternate Switching Ranging/INS Integrated Navigation and Positioning Algorithm

Abstract

To solve the problem of location services in harsh environments, we propose an integrated navigation algorithm based on broadband low-earth-orbit (LEO) satellite communication and navigation integration with 3-satellite alternate switch ranging. First, we describe the algorithm principle and processing flow in detail; next, we analyze and model the ranging error source and propose a combined multipath and non-line-of-sight (NLOS) error analysis model, which avoids discussing the complex multipath number of paths and its modeling process; in addition, we also propose a multimodal Gaussian noise-based interference model and analyze and model the LEO satellite orbital disturbance. The final simulation results show that our proposed algorithm can not only effectively overcome inertial navigation system (INS) divergence, but also achieve high positioning accuracy, especially when continuous ranging values are used. It can still ensure good anti-interference performance and robustness in terms of path and noise interference and by alternately switching ranging, there are other potential advantages. Compared to some of the existing representative advanced algorithms, it has higher accuracy, stronger stability and lower cost. Furthermore, it can be used as a location reference solution for real-time location services and life search and rescue in harsh environments with incomplete visual satellites and can also be used as a technical reference design solution for the future integration of communication and navigation (ICN).

Design of a Novel Miniaturization Technique for GNSS Antennas

“…The antenna size without capacitive loading is 43x43x14mm 3 . Implementing capacitive loading technique, where the edges of the patch builds capacitance with the ground below, reduces the dimensions to 32x32x14mm 3 . This helps in reducing the on-chip antenna area for applications like smart-phones and other miniature circuits.…”

“…3 below shows the simulation model. The antenna size without capacitive loading is 43x43x14mm 3 . Implementing capacitive loading technique, where the edges of the patch builds capacitance with the ground below, reduces the dimensions to 32x32x14mm 3 .…”

“…L5 has similar chipping rate of 10.23 MHz to that of P-code of L1-Band. This high chipping rate of L5 would provide improved performance ranging and better code measurement than L1 C/A code measurements [3]. L2 on the other hand, has a long code and hence provides ha better correlation protection with respect to L1, which will be useful in conditions where the GPS signals are weak like indoors, and forested areas.…”

“…The L1 signal (GPS signal) centered at 1575.42 MHz consists of two Parts (i) the public Coarse/Acquisition Code (C/A) and (ii) the military reserved Precision Code (P-code) [3]. The L2 frequency was implemented after the L1.…”

Design and Performance Analysis of Navigation Signal Based on OFDM

“…Communication navigation fusion positioning technology has become an effective means to solve indoor positioning problems and enhance location service capabilities, and it is a key supporting technology for comprehensive positioning navigation timing systems [2]. Ubiquitous high-precision space-time information will play an important role in future developments [3,4], and communication navigation fusion is a general trend for future developments [5][6][7][8]. Communication and navigation integration is conducive to the complementarity of communication and navigation signals.…”