Aerospace and Electronic Systems - March 2019 - 36

Mid-Sea and Land Based Wind Measurement for Technology Demonstrator

Figure 6.
Photograph of Pisharoty sonde receiver.

Even though only the wind data is used for DOL WB,
other sensor parameters are used as the input for the
weather prediction by Indian Space Research Organization (ISRO) meteorological experts. Since the measured
wind data and atmospheric parameters over the Bay of
Bengal are limited, the data from the ship based sonde
ascent campaigns are important to the scientific community for research and analysis. The wind variation in
1 hour 40 minutes (difference plot) over SHAR on launch
day is shown in Figure 13. This indicates the variation in
the wind from the point of wind profile generation and liftoff, which is well within the wind tolerance of the launch
vehicle. Figure 14 gives typical plots of temperature, pressure, and relative humidity variation at different altitudes
of the atmosphere.

Figure 7.
Wind profile generation scheme, T is the time of launch (0700 IST
on 23.05.2016).

Figure 8.
Schematic of Pisharoty sonde system configuration at SDSC
SHAR (prime/redundant).

36

CONCLUSION
This paper presents the requirement and importance of
wind data for launch vehicle re-entry missions and
describes how the wind measurement and wind profile
generation was done effectively for India's first reusable
launch vehicle re-entry mission (RLV TD HEX01).
The details of ISRO's Pisharoty sonde system, which
was used for wind measurement for this mission is also
presented. The system provided timely and quality wind
data for the DOL-WB of RLV-TD HEX01 mission as per
the ascent and descent phase requirements. The scheme
for the generation of final wind profile from sonde data,
high altitude balloon ascent data, and sounding rocket
data, which has to be loaded to the reentry vehicle before
liftoff is also described in detail. The augmented scheme
with extra ship-based measurements for wind profile generation and backup plan for DOL-WB during both ascent
and descent phase proved highly effective. The pressure,
temperature, and humidity data collected using the sonde
system from both ship-based and SHAR-based measurements, which was vital in atmospheric modeling and
prediction during the campaign is also presented in
this paper.

IEEE A&E SYSTEMS MAGAZINE

MARCH 2019



Aerospace and Electronic Systems - March 2019

Table of Contents for the Digital Edition of Aerospace and Electronic Systems - March 2019

Contents
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