0 Comments
The clock offsets estimated by the new strategy show a good consistency with GBM clock offsets. After analyzing problems in the clock offsets measurement process of BDS-3, the paper proposes a new strategy to real-time estimate high-accuracy satellite clock offsets. However, affected by some deficiencies of the two-way superimposition strategy, the accuracy of BDS-3 clock offsets parameters is 1.29 ns (RMS), which is the main bottleneck for BDS-3 to improve its space signal accuracy. Unlike other GNSSs, BDS-3 uses the two-way superimposition strategy to measure satellite clock offsets. Satellite clock offsets are the critical parameters for The Global Navigation Satellite Systems (GNSSs) to provide position and timing (PNT) service. It is found that the TIDs increase the errors of ionospheric corrections, thus affecting the convergence time, positioning accuracy, and reliability of PPP–RTK. The impact of Travelling Ionospheric Disturbance (TID) on the PPP–RTK performances is further studied with simulation. Only when an optimal prior variance is determined for the ionospheric delay in PPP–RTK model, the convergence time for PPP–RTK can be shorten greatly. After adding the errors, the ionospheric information with a small variance leads to a long convergence time and that with a larger variance leads to the same convergence time as that of PPP-AR. The corresponding convergence time of PPP–RTK is less than 1 min, about 3, 5, and 6 min, respectively. To analyze the influences of the optimal prior variances of external ionospheric delay on the PPP–RTK results, the errors of 0.5 Total Electron Content Unit (TECU), 1 TECU, 3 TECU, and 5 TECU are added to the initial ionospheric delays, respectively. small-, medium-, and large-scale networks, respectively. Additionally, the TTFF of PPP–RTK is 4.4 min, 5.2 min, and 6.8 min, respectively, when constrained by the external ionospheric information derived from different network scales, e.g. The statistical results show that The Time to First Fix (TTFF) for the PPP–RTK constrained by Global Ionosphere Map (PPP–RTK-GIM) is about 8–10 min, improved by 20%–50% as compared with that for PPP Ambiguity Resolution (PPP-AR) whose TTFF is about 13–16 min. This study investigates the relationships between the PPP–RTK performances, in terms of precision and convergence time, and the accuracy of external ionospheric information. The PPP–RTK performances vary much with the accuracy of ionospheric information, which is derived from different network scales, given different prior variances, and obtained under different disturbed ionospheric conditions. Real-Time Kinematic Precise Point Positioning (PPP–RTK) is inextricably linked to external ionospheric information. Mahmud Yunus Detail Judul: Kamus Arab Indonesia Penulis: Prof. Klik link ini: Atau bisa melalui link di bawah ini tapi lebih mudah pake yang di atas: Gimana cara download Kamus Al-Munawir Gratis Manual Cara menggunakan Download Kamus Munawir Gratis Indonesia-Arab Manual: 1.Muncul Tampilan Seperti Gambar di Bawah. Jacksmith Hacked All Ores Software Download Kamus Munawir Jacksmith Hacked All Ores Software Free Software Windows.Jacksmith Hacked All Ores Software Download Langsungnya Sudah. Jacksmith Hacked All Ores Software Download Kamus Munawir. Each kit contains a valve power supply, an 8m dedicated mic cable, an IEC mains lead, a shockmount, a stand bracket, and the microphone itself. The GT66 and GT67 mics are supplied in large cardboard carrying cases, and matched pairs (with adjacent serial numbers) are available for stereo applications. I Love mics (one of the most important parts an audio chain).The Groove Tubes GT67 valve and GT55 FET mics.Photo: Mark Ewing I DO own several Groove Tube "Convertibles" (Also a Re-branded Sterling) that I like very much for live vocal use (sound like a dynamic but with clearer top end).īeing a micaholic with limited funds as of late (changing soon, I have accumulated a list of mics I want to try: A mod Apex 460, A Joly mod Oktava 319 and top of my list (and most expensive a Peluso 22 47. I wasn't overly impressed with either of them. I sold the GT66 with a Carvin tube mic that used the same power supply (Don't remember but they sold cheap). I think the K2 is an overall more balanced mic than the GT66 (Love it in a tight pattern for female vocs - it has that intimate, breathy quality due to proximity effect). If I'm correct the LDC Groove tube mics are re-branded Sterling mics. Probably my favorite "go to" mic is the ADK TL, next up would be a Neumann tlm 49 (awesome mic but not as versatile as the ADKs. I have a pair of ADK TL mics (not tube mics), a Rode K2 and HAD a GT66 (among many others). I picked up the TC but I'm still preferring my Nueman 103 more often than not. The ADK playback of my HR's sounded like my HR's whereas the other 2 did not. The Rode's hi end sounded wierd when compared to the others - kinda like my NT2's. The GT66 was really hyped and sibilant in the hi mids and really bright. The ADK was the standout especially on the speaker test they really captured the rhythm section nicely. I have had the ADK tc, the Rode K2 and the GT66 in the studio at the same time and recorded test tracks on guitar, male vocals, and jazz coming through my Mackie HR's. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |