scholarly journals Experiences with the GPS in Unstabilized CubeSat

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Pavel Kovar
Keyword(s):  
Experimental Data ◽  
Signal Acquisition ◽  
Gps Receiver ◽  
Small Satellite ◽  
Power Budget ◽  
Successful Operation ◽  
Polar Orbit ◽  
Position Information ◽  
Space Experiments ◽  
Satellite Rotation

The paper summarizes the experiences with the operation of the piNAV GPS receiver in a 1U unstabilized CubeSat operated on LEO orbit. piNAV L1 is a GPS receiver developed by an author for small satellite missions. The receiver is equipped with the 15 GPS L1 C/A channels and acquisition accelerator that shortens the cold start of the receiver on LEO to 65 s. The typical power consumption is 120 mW. Lucky-7 is a private 1U technological CubeSat with power budget 1 W that operates on the quasisynchronous polar orbit at altitude 520 km. One of its scientific missions is to test the operation of GPS. The space experiments proved the successful operation of the GPS receiver. The position information was available for approximately 80% of the time, where the position outage was caused by a satellite rotation and relatively long navigation signal reacquisition. The experimental data proved that the position availability can be improved by a higher-performance signal acquisition engine.

Development of Appropriate Power Distribution Design for Can-Sized satellite (canSAT)

2021 ◽  
Vol 02 (02) ◽  
Author(s):  
Devina Cristine Marubin ◽  
◽  
Sim Sy Yi ◽  
Keyword(s):  
Power System ◽  
Data Acquisition ◽  
Power Supply ◽  
Communication System ◽  
Power Distribution ◽  
Low Cost ◽  
Small Satellite ◽  
Power Budget ◽  
Space Agency ◽  
Rules Set

Can-Sized satellite (canSAT) is a small satellite that is used for educational purpose. CanSAT offer student to build their satellites with their creativity which make the learning process more effective. In Malaysia, SiswaSAT is held by the Malaysia Space Agency for students in different categories to participate and build their satellites according to rules set and it should be a low-cost project. CanSAT can be divided into few parts which are communication system, onboard data acquisition, ground control station and power system. The power system is one of the important and heaviest subsystems, it needed to supply power, but weight and size are one of the main concerned as the canSAT should not exceed the required weight and selecting power supply that is matched with the overall power budget that has small size and lightweight is challenging. Therefore, the power supply selection should consider this detail. The power distribution design should be able to supply an appropriate amount of current and voltage to the components according to their specification. This study aims to develop and test the proposed prototype which is named ScoreSAT able to provide data and have enough power supply for the whole operation. Therefore, an initiative to develop the appropriate power distribution design for canSAT is taken to overcome the problem of the power system. Moreover, each subsystem needs to be tested by obtaining the results from the onboard data acquisition and transmit the data using the communication system before integrating into the power system. ScoreSAT prototype needs to carry the system that is mounted inside, thus the space inside the prototype needs to be fully utilized for the whole system to fit in. ScoreSAT completes the mission by obtaining data acquisition during the operation.

Extracting Ionosphere Scintillations Index Based on Single Frequency GPS Software Receiver

2012 ◽  
Vol 190-191 ◽  
pp. 1136-1143
Author(s):  
Zhi Huang ◽  
Hong Yuan ◽  
Qi Yao Zuo
Keyword(s):  
High Speed ◽  
Single Frequency ◽  
Scintillation Index ◽  
Ionospheric Scintillation ◽  
Signal Acquisition ◽  
Gps Receiver ◽  
Signal Loss ◽  
Software Receiver ◽  
Ionospheric Plasma Density ◽  
Gps Signal Acquisition

Scintillations are caused by ionospheric plasma-density irregularities and can lead to signal power fading, loss of lock of the carrier tracking loop in the GPS receiver. The traditional method of monitoring and mitigating scintillation is to transform commercial GPS receiver with modified hardware and embedded software. To better facilitate advance development GPS receiver under different condition, GPS software scintillation receiver is designed in this paper. The hardware scheme of high-speed GPS signal acquisition system is first discussed and implemented with FPGA and DSP architecture. Then, we describe receiver software processing algorithm, particularly the portion involving the scintillation signal acquisition and tracking, ionospheric scintillation index extracting and scintillation monitoring. The performance of software receiver is demonstrated under scintillation conditions. Relevant results show that software-receiver based approach can avoid weak signal loss and extract effectively ionospheric scintillation parameter compared with the traditional extracting method. Software receiver is suitable and reliable for the ionospheric scintillations monitoring, and can provide theoretical foundations and experimental preparations for future scintillation studies implemented with Chinese indigenous BeiDou-Ⅱ navigation and poisoning system.

scholarly journals An Efficient Signal Acquisition Method for GPS Software-Defined Radio Receivers

2014 ◽  
pp. 134
Author(s):  
Ta Hai Tung
Keyword(s):  
Software Defined Radio ◽  
Digital Processing ◽  
Signal Acquisition ◽  
Gps Receiver ◽  
Parallel Method ◽  
Serial Search ◽  
Radio Receivers ◽  
Computational Speed ◽  
Programmable Processors ◽  
Acquisition Method

With the development of the computationalpower of programmable processors, the Software-DefinedRadio (SDR) approach for GPS receivers has been widelyconsidered. However, in comparison with the conventionalhardware receivers, the computational speed of the SDRreceivers is still a problem needed to be improved. As afirst process of the digital processing part, and also themost resource consuming process of a GPS receiver, thesignal acquisition process is very important and neededto be improved in order to suit with the SDR approach.This paper introduces a hybrid signal acquisition methodleveraging the conventional serial search acquisition (typical in hardware receivers), and the FFT-based parallelsearch (typical in SDR receivers) in order to significantlyimprove the acquisition sensitivity, meanwhile keep thecomputational complexity still comparable with that of theFFT-based parallel method.

scholarly journals Risk-Aware Wireless Positioning in Maritime Environment

2019 ◽  
Vol 9 (10) ◽  
pp. 2107
Author(s):  
Keun Young Seok ◽  
Jong Yeol Ryu ◽  
Jung Hoon Lee
Keyword(s):  
Facility Management ◽  
Ocean Current ◽  
Signal Frequency ◽  
Average Risk ◽  
Power Budget ◽  
Position Information ◽  
Wireless Location ◽  
Wireless Positioning ◽  
Wireless Communications Systems ◽  
Maritime Environment

The evolution of wireless communications systems has promoted various applications that require user positions in various environments including indoor, maritime and aerial environments. This progress has also brought advanced wireless location tracking (i.e., positioning) schemes for many purposes such as military, accident prevention and facility management. In this paper, we propose a risk-aware wireless positioning scheme, where the position information is required for safety. Especially for the maritime environment, we model the risk of the user at each position as a function of location accuracy, geometry, ocean current speed and so forth. Considering the power budget of each user, we optimize the user’s wireless positioning signal frequency (i.e., the positioning signal broadcasting rate) at each position so that our positioning scheme can minimize the average risk for each user.

The small satellite NINA-MITA to study galactic and solar cosmic rays in low-altitude polar orbit

2003 ◽  
Vol 31 (2) ◽  
pp. 351-356 ◽  
Author(s):  
G. Furano ◽  
V. Bidoli ◽  
M. Casolino ◽  
M.P. De Pascale ◽  
A. Iannucci ◽  
...  
Keyword(s):  
Cosmic Rays ◽  
Small Satellite ◽  
Polar Orbit ◽  
Solar Cosmic Rays ◽  
Low Altitude

Innovative Measures of Accuracy and Situational Awareness during Land Navigation

1998 ◽  
Vol 42 (19) ◽  
pp. 1366-1370 ◽  
Author(s):  
Mary McWesler ◽  
William P. Marshak ◽  
Monica M. Glumm
Keyword(s):  
Navigation System ◽  
Situational Awareness ◽  
Computer Navigation ◽  
Gps Receiver ◽  
Course Performance ◽  
Position Information ◽  
Computer Navigation System ◽  
Computer Based ◽  
The U.S

A helmet-mounted display (HMD)-based computer navigation system that partially mimics the U.S. Army's Land Warrior ensemble provided position information and map updates to soldiers navigating a three-kilometer course. Performance with the HMD system was compared to traditional navigation with paper map, compass, and a hand-held GPS receiver. New objective computer-based measures of navigational accuracy and situational awareness (SA) were developed. Traditional measures of navigational accuracy were not sensitive enough to detect differences between HMD and traditional navigational methods. The more sensitive new measure based on distance traveled found the HMD-based system to be superior. This method is easily adaptable to civilian applications such as orienteering. A supposed advantage of using HMDs is enhanced SA. A SA measure was developed which used probe questions generated by the computer. Although the probe questions found no significant differences between the conditions, the method seems promising for future applications.

Based on Active Vibration Control Technology of Signal Acquisition System Research

2012 ◽  
Vol 580 ◽  
pp. 165-169
Author(s):  
Jia Wei Chu ◽  
Rui Hua Xu ◽  
Jun Hua He ◽  
Ming Zhi Wei ◽  
Wei Wang
Keyword(s):  
Experimental Data ◽  
High Resolution ◽  
Active Vibration Control ◽  
Vibration Signal ◽  
Acquisition System ◽  
Vibration Measurement ◽  
Signal Acquisition ◽  
Control Technology ◽  
System Research ◽  
Active Vibration

The principle of full vibration signal acquisition system is introduced. This article through the use of PSD high resolution, the characteristics of the corresponding speed, put it to use in vibration measurement, and introduces the realization method, Including the front optical, electrical and late signal processing, And through the concrete experimental data, and verifies the feasibility of the scheme.

A Route Planning and Driver Information System for PLEIADES

1994 ◽  
Vol 47 (2) ◽  
pp. 159-164 ◽  
Author(s):  
Michael Ness ◽  
Martin Herbert
Keyword(s):  
Information System ◽  
Low Cost ◽  
Route Planning ◽  
Planning System ◽  
Gps Receiver ◽  
Traffic Condition ◽  
Position Information ◽  
Network Information ◽  
Optimum Route ◽  
Driver Information System

This paper describes a low-cost, in-vehicle route planning and driver information system being developed for use within the DRIVE PLEIADES (London–Paris corridor) project. The system integrates vehicle position information from a GPS receiver, traffic condition messages broadcast from both RDS-TMC and radio paging, and road network information from a route planning system. Instructions describing the route to be followed are presented to the driver on a dashboard-mounted LCD and in spoken form. The system tracks the calculated optimum route and gives instructions for the next section of the route to be covered. The optimum route is continuously recalculated, reacting to TMC messages and the vehicle's location.

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