Geolocation and Correction Method for Dual Polarization Instrument on Same Platform

Technical indexes	POSP	SIPC
Scanning mode	Along track scanning	Push broom scanning
Field of view	-38°~+38°	10°×7.4°
Nadir pixel spatial resolution	φ42 m@4 km	0.5 m@4 km
Instantaneous field of view	0.602°	-
Scanning mirror pointing accuracy	<3'	-
Resolution	-	1392(H)×1040(V)
Sampling interval	0.52°	-
Sampling period	1.43 ms/frame	500 ms/frame
Radiation accuracy	5%	5%
Polarization accuracy	<0.005(@P=0.2)	<0.02(@P=0.2)

Table 2. Coordinate system definitions

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Table 2. Coordinate system definitions

Coordinate system	Origin	X-axis direction
Image space coordinate	Projection center	Parallel to the image plane coordinate system x-axis
Instrument coordinate	Projection center	Point to the right side of the vector
IMU body coordinate	Instrument center of mass	Point to the right side of the vector
Navigation coordinate	Carrier center	Consistent with geography heading east
Earth-centered, Earth-fixed(ECEF)	Geocentric	Point to the intersection of the zero meridian plane and the protocol

Table 3. Geolocation simulation verifies the data used

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Table 3. Geolocation simulation verifies the data used

Name	Symbols	Nominal value	Error
Instrument geodetic longitude	$B$	120°	0.000 1°
Instrumental geodetic latitude	$L$	40°	0.000 1°
Instrument geodetic height	$H$	5 000 $m$	5 $m$
Pitch angle	$θ$	0°	0.008°
Roll angle	$ϕ$	45°	0.008°
Yaw angle	$ψ$	0°	0.07°
SIPC principal point	$x_{0}$	2.98 $p i x$	1 $p i x$
SIPC principal point	$y_{0}$	2.74 $p i x$	1 $p i x$
SIPC focal length	$f$	51.70 $m m$	5 $p i x$
Position elevation	$h$	200 $m$	5 $m$
Installation error angle (pitch)	$Δ θ$	0°	0.1°
Installation error angle (roll)	$Δ ϕ$	0°	0.1°
Installation error angle (Yaw)	$Δ ψ$	0°	0.1°
POSP scan angle	$φ$	-38°~+38°	0.05°

Table 4. Geolocation results of SIPC and POSP

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Table 4. Geolocation results of SIPC and POSP

Result of geolocation results	Nominal value	SIPC		POSP
Result of geolocation results	Nominal value	Calculated value	Error(standard deviation)	Calculated value	Error(standard deviation)
Geolocation error		$R = \sqrt[]{R_{X}^{2} + R_{Y}^{2} + R_{Z}^{2}} = 24.1195 m$		$R = \sqrt[]{R_{X}^{2} + R_{Y}^{2} + R_{Z}^{2}} = 25.3950 m$
Longitude	120°	119.938 0°	0.000 206°	119.986 6°	0.000 196°
Latitude	40°	40.006 2°	0.000 104°	40.003 4°	0.000 211°
Height	5 000 m	200.021 0 m	4.627 1 m	200.213 7 m	5.432 3 m

Table 5. Location results of SIPC aviation test

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Table 5. Location results of SIPC aviation test

	Target						Average	Standard deciation
	T1	T2	T3	T4	T5	T6	Average	Standard deciation
Scene 1	25.07	26.26	28.56	25.52	30.19	27.35	27.16	4.36
Scene 1 improved	23.92	24.62	25.18	21.73	24.13	25.24	24.14	2.89
Scene 2	27.63	23.50	24.05	24.82	26.81	28.29	25.85	4.46
Scene 2 improved	23.71	20.35	22.05	23.65	24.54	22.68	22.83	3.33

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Zhenyang LI, Peng ZOU, Zhenhai LIU, Shuangshuang ZHU, Xuefeng LEI, Jin HONG. Geolocation and Correction Method for Dual Polarization Instrument on Same Platform[J]. Acta Photonica Sinica, 2021, 50(2): 142

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